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874 lines
18 KiB
C++
874 lines
18 KiB
C++
// this is a little 'sandbox' application I put together that duplicates
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// the 'guts' of the Polygon algorithm. It allows for quick turn-around
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// in testing the algorithm to see what effect your changes have.
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//
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// Royce3
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// the stuff immediately following is support so that the sandbox code
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// is nearly identical to the real thing.
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// search for the _tagFILL_EDGE struct to find the beginning of the
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// real stuff.
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#include <memory.h>
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#include <malloc.h>
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#include <stdio.h>
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#include <string.h>
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#include <conio.h>
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#include <assert.h>
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#define FASTCALL
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#define STDCALL
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#define INT int
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#define CLIPOBJ int
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#define SURFOBJ int
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#define PBRUSHOBJ int
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#define MIX char
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#define BOOL bool
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#define TRUE true
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#define FALSE false
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#define CONST const
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#define MmCopyFromCaller memmove
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#define ALTERNATE 0
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#define WINDING 1
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#define ASSERT assert
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typedef struct W
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{
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int polyFillMode;
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} W;
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typedef struct DC
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{
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CLIPOBJ CombinedClip;
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W w;
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} DC, *PDC;
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typedef struct tagPOINT
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{
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long x, y;
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} POINT, *PPOINT, *LPPOINT;
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typedef struct RECTL
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{
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long left, top, right, bottom;
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} RECTL, *PRECTL;
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#define EngFreeMem free
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#define FL_ZERO_MEMORY 1
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#define DPRINT1 printf("%i:",__LINE__);printf
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inline void DPRINT(...){}
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#define SCREENX 25
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#define SCREENY 15
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char screen[SCREENY][SCREENX];
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#define EDGE_CHAR '*'
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#define FILL_CHAR 'o'
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void* EngAllocMem ( int zero, unsigned long size, int tag=0 )
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{
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void* p = malloc ( size );
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if ( zero )
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memset ( p, 0, size );
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return p;
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}
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template <class T>
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inline T MIN ( T a, T b )
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{
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return a < b ? a : b;
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}
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template <class T>
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inline T MAX ( T a, T b )
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{
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return a > b ? a : b;
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}
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template <class T>
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inline T abs ( T t )
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{
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return t < 0 ? -t : t;
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}
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void putpixel ( int x, int y, char c )
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{
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ASSERT( x >= 0 && x < SCREENX && y >= 0 && y < SCREENY );
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if ( screen[y][x] == c )
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return;
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if ( screen[y][x] == ' ' )
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screen[y][x] = c;
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else
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screen[y][x] = '#';
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}
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void IntEngLineTo (
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SURFOBJ*,
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CLIPOBJ,
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PBRUSHOBJ,
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int x1, int y1, int x2, int y2,
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RECTL*,
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MIX mix )
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{
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int dx = x2 - x1;
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int dy = y2 - y1;
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int absdx = abs(dx);
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int absdy = abs(dy);
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int EMax = MAX(absdx,absdy);
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int E = EMax/2;
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int xinc = dx < 0 ? -1 : 1,
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yinc = dy < 0 ? -1 : 1;
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if ( !dy )
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{
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while ( x1 != x2 )
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{
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putpixel ( x1, y1, mix );
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x1 += xinc;
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}
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return;
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}
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if ( !dx )
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{
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while ( y1 != y2 )
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{
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putpixel ( x1, y1, mix );
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y1 += yinc;
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}
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return;
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}
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for ( int i = 0; i < EMax; i++ )
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{
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putpixel ( x1, y1, mix );
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if ( absdy > absdx )
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{
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y1 += yinc;
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E += absdx;
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if ( E >= EMax )
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{
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E -= absdy;
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x1 += xinc;
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}
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}
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else
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{
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x1 += xinc;
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E += absdy;
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if ( E >= EMax )
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{
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E -= absdx;
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y1 += yinc;
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}
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}
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}
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}
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#define FILL_EDGE_ALLOC_TAG 0x45465044
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/*
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** This struct is used for book keeping during polygon filling routines.
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*/
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typedef struct _tagFILL_EDGE
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{
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/*Basic line information*/
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int FromX;
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int FromY;
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int ToX;
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int ToY;
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int dx;
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int dy;
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int absdx, absdy;
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int x, y;
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int xmajor;
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/*Active Edge List information*/
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int XIntercept[2];
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int Error;
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int ErrorMax;
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int XDirection, YDirection;
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/* The next edge in the active Edge List*/
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struct _tagFILL_EDGE * pNext;
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} FILL_EDGE;
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typedef struct _FILL_EDGE_LIST
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{
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int Count;
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FILL_EDGE** Edges;
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} FILL_EDGE_LIST;
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#if 0
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static
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void
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DEBUG_PRINT_ACTIVE_EDGELIST ( FILL_EDGE* list )
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{
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FILL_EDGE* pThis = list;
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if (0 == list)
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{
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DPRINT1("List is NULL\n");
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return;
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}
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while(0 != pThis)
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{
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//DPRINT1("EDGE: (%d, %d) to (%d, %d)\n", pThis->FromX, pThis->FromY, pThis->ToX, pThis->ToY);
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DPRINT1("EDGE: [%d,%d]\n", pThis->XIntercept[0], pThis->XIntercept[1] );
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pThis = pThis->pNext;
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}
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}
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#else
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#define DEBUG_PRINT_ACTIVE_EDGELIST(x)
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#endif
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/*
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** Hide memory clean up.
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*/
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static
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void
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FASTCALL
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POLYGONFILL_DestroyEdgeList(FILL_EDGE_LIST* list)
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{
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int i;
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if ( list )
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{
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if ( list->Edges )
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{
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for ( i = 0; i < list->Count; i++ )
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{
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if ( list->Edges[i] )
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EngFreeMem ( list->Edges[i] );
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}
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EngFreeMem ( list->Edges );
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}
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EngFreeMem ( list );
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}
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}
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/*
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** This makes and initiaizes an Edge struct for a line between two points.
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*/
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static
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FILL_EDGE*
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FASTCALL
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POLYGONFILL_MakeEdge(POINT From, POINT To)
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{
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FILL_EDGE* rc = (FILL_EDGE*)EngAllocMem(FL_ZERO_MEMORY, sizeof(FILL_EDGE), FILL_EDGE_ALLOC_TAG);
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if (0 == rc)
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return NULL;
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//DPRINT1("Making Edge: (%d, %d) to (%d, %d)\n", From.x, From.y, To.x, To.y);
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//Now Fill the struct.
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if ( To.y < From.y )
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{
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rc->FromX = To.x;
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rc->FromY = To.y;
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rc->ToX = From.x;
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rc->ToY = From.y;
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rc->YDirection = -1;
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// lines that go up get walked backwards, so need to be offset
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// by -1 in order to make the walk identically on a pixel-level
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rc->Error = -1;
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}
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else
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{
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rc->FromX = From.x;
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rc->FromY = From.y;
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rc->ToX = To.x;
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rc->ToY = To.y;
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rc->YDirection = 1;
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rc->Error = 0;
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}
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rc->x = rc->FromX;
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rc->y = rc->FromY;
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rc->dx = rc->ToX - rc->FromX;
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rc->dy = rc->ToY - rc->FromY;
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rc->absdx = abs(rc->dx);
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rc->absdy = abs(rc->dy);
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rc->xmajor = rc->absdx > rc->absdy;
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rc->ErrorMax = MAX(rc->absdx,rc->absdy);
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rc->Error += rc->ErrorMax / 2;
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rc->XDirection = (rc->dx < 0)?(-1):(1);
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rc->pNext = 0;
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DPRINT("MakeEdge (%i,%i)->(%i,%i) d=(%i,%i) dir=(%i,%i) err=%i max=%i\n",
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From.x, From.y, To.x, To.y, rc->dx, rc->dy, rc->XDirection, rc->YDirection, rc->Error, rc->ErrorMax );
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return rc;
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}
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/*
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** My Edge comparison routine.
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** This is for scan converting polygon fill.
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** First sort by MinY, then Minx, then slope.
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**
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** This comparison will help us determine which
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** lines will become active first when scanning from
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** top (min y) to bottom (max y).
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**
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** Return Value Meaning
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** Negative integer element1 < element2
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** Zero element1 = element2
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** Positive integer element1 > element2
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*/
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static
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INT
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FASTCALL
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FILL_EDGE_Compare(FILL_EDGE* Edge1, FILL_EDGE* Edge2)
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{
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int e1 = Edge1->XIntercept[0] + Edge1->XIntercept[1];
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int e2 = Edge2->XIntercept[0] + Edge2->XIntercept[1];
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return e1 - e2;
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}
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/*
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** Insert an edge into a list keeping the list in order.
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*/
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static
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void
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FASTCALL
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POLYGONFILL_ActiveListInsert(FILL_EDGE** activehead, FILL_EDGE* NewEdge )
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{
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FILL_EDGE *pPrev, *pThis;
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//DPRINT1("In POLYGONFILL_ActiveListInsert()\n");
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ASSERT ( activehead && NewEdge );
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if ( !*activehead )
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{
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NewEdge->pNext = NULL;
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*activehead = NewEdge;
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return;
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}
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/*
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** First lets check to see if we have a new smallest value.
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*/
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if (FILL_EDGE_Compare(NewEdge, *activehead) <= 0)
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{
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NewEdge->pNext = *activehead;
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*activehead = NewEdge;
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return;
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}
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/*
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** Ok, now scan to the next spot to put this item.
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*/
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pThis = *activehead;
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pPrev = NULL;
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while ( pThis && FILL_EDGE_Compare(pThis, NewEdge) < 0 )
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{
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pPrev = pThis;
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pThis = pThis->pNext;
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}
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ASSERT(pPrev);
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NewEdge->pNext = pPrev->pNext;
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pPrev->pNext = NewEdge;
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//DEBUG_PRINT_ACTIVE_EDGELIST(*activehead);
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}
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/*
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** Create a list of edges for a list of points.
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*/
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static
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FILL_EDGE_LIST*
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FASTCALL
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POLYGONFILL_MakeEdgeList(PPOINT Points, int Count)
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{
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int CurPt = 0;
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FILL_EDGE_LIST* list = 0;
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FILL_EDGE* e = 0;
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if ( 0 == Points || 2 > Count )
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return 0;
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list = (FILL_EDGE_LIST*)EngAllocMem(FL_ZERO_MEMORY, sizeof(FILL_EDGE_LIST), FILL_EDGE_ALLOC_TAG);
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if ( 0 == list )
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goto fail;
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list->Count = 0;
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list->Edges = (FILL_EDGE**)EngAllocMem(FL_ZERO_MEMORY, Count*sizeof(FILL_EDGE*), FILL_EDGE_ALLOC_TAG);
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if ( !list->Edges )
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goto fail;
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memset ( list->Edges, 0, Count * sizeof(FILL_EDGE*) );
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for ( CurPt = 1; CurPt < Count; ++CurPt )
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{
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e = POLYGONFILL_MakeEdge ( Points[CurPt-1], Points[CurPt] );
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if ( !e )
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goto fail;
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// if a straight horizontal line - who cares?
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if ( !e->absdy )
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EngFreeMem ( e );
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else
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list->Edges[list->Count++] = e;
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}
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e = POLYGONFILL_MakeEdge ( Points[CurPt-1], Points[0] );
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if ( !e )
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goto fail;
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if ( !e->absdy )
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EngFreeMem ( e );
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else
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list->Edges[list->Count++] = e;
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return list;
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fail:
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DPRINT1("Out Of MEMORY!!\n");
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POLYGONFILL_DestroyEdgeList ( list );
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return 0;
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}
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/*
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** This slow routine uses the data stored in the edge list to
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** calculate the x intercepts for each line in the edge list
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** for scanline Scanline.
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**TODO: Get rid of this floating point arithmetic
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*/
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static
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void
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FASTCALL
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POLYGONFILL_UpdateScanline(FILL_EDGE* pEdge, int Scanline)
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{
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if ( 0 == pEdge->dy )
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return;
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ASSERT ( pEdge->FromY <= Scanline && pEdge->ToY > Scanline );
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if ( pEdge->xmajor )
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{
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int steps;
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ASSERT ( pEdge->y == Scanline );
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// now shoot to end of scanline collision
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steps = (pEdge->ErrorMax-pEdge->Error-1)/pEdge->absdy;
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if ( steps )
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{
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// record first collision with scanline
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int x1 = pEdge->x;
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pEdge->x += steps * pEdge->XDirection;
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pEdge->Error += steps * pEdge->absdy;
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ASSERT ( pEdge->Error < pEdge->ErrorMax );
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pEdge->XIntercept[0] = MIN(x1,pEdge->x);
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pEdge->XIntercept[1] = MAX(x1,pEdge->x);
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}
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else
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{
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pEdge->XIntercept[0] = pEdge->x;
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pEdge->XIntercept[1] = pEdge->x;
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}
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// we should require exactly 1 step to step onto next scanline...
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ASSERT ( (pEdge->ErrorMax-pEdge->Error-1) / pEdge->absdy == 0 );
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pEdge->x += pEdge->XDirection;
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pEdge->Error += pEdge->absdy;
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ASSERT ( pEdge->Error >= pEdge->ErrorMax );
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// now step onto next scanline...
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pEdge->Error -= pEdge->absdx;
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pEdge->y++;
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}
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else // then this is a y-major line
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{
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pEdge->XIntercept[0] = pEdge->x;
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pEdge->XIntercept[1] = pEdge->x;
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pEdge->Error += pEdge->absdx;
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pEdge->y++;
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if ( pEdge->Error >= pEdge->ErrorMax )
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{
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pEdge->Error -= pEdge->ErrorMax;
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pEdge->x += pEdge->XDirection;
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ASSERT ( pEdge->Error < pEdge->ErrorMax );
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}
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}
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DPRINT("Line (%d, %d) to (%d, %d) intersects scanline %d at (%d,%d)\n",
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pEdge->FromX, pEdge->FromY, pEdge->ToX, pEdge->ToY, Scanline, pEdge->XIntercept[0], pEdge->XIntercept[1] );
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}
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/*
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** This method updates the Active edge collection for the scanline Scanline.
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*/
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static
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void
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STDCALL
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POLYGONFILL_BuildActiveList ( int Scanline, FILL_EDGE_LIST* list, FILL_EDGE** ActiveHead )
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{
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int i;
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ASSERT ( list && ActiveHead );
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*ActiveHead = 0;
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for ( i = 0; i < list->Count; i++ )
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{
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FILL_EDGE* pEdge = list->Edges[i];
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ASSERT(pEdge);
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if ( pEdge->FromY <= Scanline && pEdge->ToY > Scanline )
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{
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POLYGONFILL_UpdateScanline ( pEdge, Scanline );
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POLYGONFILL_ActiveListInsert ( ActiveHead, pEdge );
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}
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}
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}
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/*
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** This method fills the portion of the polygon that intersects with the scanline
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** Scanline.
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*/
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static
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void
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STDCALL
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POLYGONFILL_FillScanLineAlternate(
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PDC dc,
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int ScanLine,
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FILL_EDGE* ActiveHead,
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SURFOBJ *SurfObj,
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PBRUSHOBJ BrushObj,
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MIX RopMode )
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{
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FILL_EDGE *pLeft, *pRight;
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if ( !ActiveHead )
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return;
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pLeft = ActiveHead;
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pRight = pLeft->pNext;
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ASSERT(pRight);
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while ( NULL != pRight )
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{
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int x1 = pLeft->XIntercept[0];
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int x2 = pRight->XIntercept[1];
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if ( x2 > x1 )
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{
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RECTL BoundRect;
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BoundRect.top = ScanLine;
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BoundRect.bottom = ScanLine + 1;
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BoundRect.left = x1;
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BoundRect.right = x2;
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DPRINT("Fill Line (%d, %d) to (%d, %d)\n",x1, ScanLine, x2, ScanLine);
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IntEngLineTo( SurfObj,
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dc->CombinedClip,
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BrushObj,
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x1,
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ScanLine,
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x2,
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ScanLine,
|
|
&BoundRect, // Bounding rectangle
|
|
RopMode); // MIX
|
|
}
|
|
pLeft = pRight->pNext;
|
|
pRight = pLeft ? pLeft->pNext : NULL;
|
|
}
|
|
}
|
|
|
|
static
|
|
void
|
|
STDCALL
|
|
POLYGONFILL_FillScanLineWinding(
|
|
PDC dc,
|
|
int ScanLine,
|
|
FILL_EDGE* ActiveHead,
|
|
SURFOBJ *SurfObj,
|
|
PBRUSHOBJ BrushObj,
|
|
MIX RopMode )
|
|
{
|
|
FILL_EDGE *pLeft, *pRight;
|
|
int x1, x2, winding = 0;
|
|
RECTL BoundRect;
|
|
|
|
if ( !ActiveHead )
|
|
return;
|
|
|
|
BoundRect.top = ScanLine;
|
|
BoundRect.bottom = ScanLine + 1;
|
|
|
|
pLeft = ActiveHead;
|
|
winding = pLeft->YDirection;
|
|
pRight = pLeft->pNext;
|
|
ASSERT(pRight);
|
|
|
|
// setup first line...
|
|
x1 = pLeft->XIntercept[0];
|
|
x2 = pRight->XIntercept[1];
|
|
|
|
pLeft = pRight;
|
|
pRight = pLeft->pNext;
|
|
winding += pLeft->YDirection;
|
|
|
|
while ( NULL != pRight )
|
|
{
|
|
int newx1 = pLeft->XIntercept[0];
|
|
int newx2 = pRight->XIntercept[1];
|
|
if ( winding )
|
|
{
|
|
// check and see if this new line touches the previous...
|
|
if ( (newx1 >= x1 && newx1 <= x2)
|
|
|| (newx2 >= x1 && newx2 <= x2)
|
|
|| (x1 >= newx1 && x1 <= newx2)
|
|
|| (x2 >= newx2 && x2 <= newx2)
|
|
)
|
|
{
|
|
// yup, just tack it on to our existing line
|
|
x1 = MIN(x1,newx1);
|
|
x2 = MAX(x2,newx2);
|
|
}
|
|
else
|
|
{
|
|
// nope - render the old line..
|
|
BoundRect.left = x1;
|
|
BoundRect.right = x2;
|
|
|
|
DPRINT("Fill Line (%d, %d) to (%d, %d)\n",x1, ScanLine, x2, ScanLine);
|
|
IntEngLineTo( SurfObj,
|
|
dc->CombinedClip,
|
|
BrushObj,
|
|
x1,
|
|
ScanLine,
|
|
x2,
|
|
ScanLine,
|
|
&BoundRect, // Bounding rectangle
|
|
RopMode); // MIX
|
|
|
|
x1 = newx1;
|
|
x2 = newx2;
|
|
}
|
|
}
|
|
pLeft = pRight;
|
|
pRight = pLeft->pNext;
|
|
winding += pLeft->YDirection;
|
|
}
|
|
// there will always be a line left-over, render it now...
|
|
BoundRect.left = x1;
|
|
BoundRect.right = x2;
|
|
|
|
DPRINT("Fill Line (%d, %d) to (%d, %d)\n",x1, ScanLine, x2, ScanLine);
|
|
IntEngLineTo( SurfObj,
|
|
dc->CombinedClip,
|
|
BrushObj,
|
|
x1,
|
|
ScanLine,
|
|
x2,
|
|
ScanLine,
|
|
&BoundRect, // Bounding rectangle
|
|
RopMode); // MIX
|
|
}
|
|
|
|
//When the fill mode is ALTERNATE, GDI fills the area between odd-numbered and
|
|
//even-numbered polygon sides on each scan line. That is, GDI fills the area between the
|
|
//first and second side, between the third and fourth side, and so on.
|
|
|
|
//WINDING Selects winding mode (fills any region with a nonzero winding value).
|
|
//When the fill mode is WINDING, GDI fills any region that has a nonzero winding value.
|
|
//This value is defined as the number of times a pen used to draw the polygon would go around the region.
|
|
//The direction of each edge of the polygon is important.
|
|
|
|
BOOL
|
|
STDCALL
|
|
FillPolygon(
|
|
PDC dc,
|
|
SURFOBJ *SurfObj,
|
|
PBRUSHOBJ BrushObj,
|
|
MIX RopMode,
|
|
CONST PPOINT Points,
|
|
int Count,
|
|
RECTL BoundRect )
|
|
{
|
|
FILL_EDGE_LIST *list = 0;
|
|
FILL_EDGE *ActiveHead = 0;
|
|
int ScanLine;
|
|
|
|
void
|
|
STDCALL
|
|
(*FillScanLine)(
|
|
PDC dc,
|
|
int ScanLine,
|
|
FILL_EDGE* ActiveHead,
|
|
SURFOBJ *SurfObj,
|
|
PBRUSHOBJ BrushObj,
|
|
MIX RopMode );
|
|
|
|
DPRINT("FillPolygon\n");
|
|
|
|
/* Create Edge List. */
|
|
list = POLYGONFILL_MakeEdgeList(Points, Count);
|
|
/* DEBUG_PRINT_EDGELIST(list); */
|
|
if (NULL == list)
|
|
return FALSE;
|
|
|
|
if ( WINDING == dc->w.polyFillMode )
|
|
FillScanLine = POLYGONFILL_FillScanLineWinding;
|
|
else /* default */
|
|
FillScanLine = POLYGONFILL_FillScanLineAlternate;
|
|
|
|
/* For each Scanline from BoundRect.bottom to BoundRect.top,
|
|
* determine line segments to draw
|
|
*/
|
|
for ( ScanLine = BoundRect.top; ScanLine < BoundRect.bottom; ++ScanLine )
|
|
{
|
|
POLYGONFILL_BuildActiveList(ScanLine, list, &ActiveHead);
|
|
//DEBUG_PRINT_ACTIVE_EDGELIST(ActiveHead);
|
|
FillScanLine ( dc, ScanLine, ActiveHead, SurfObj, BrushObj, RopMode );
|
|
}
|
|
|
|
/* Free Edge List. If any are left. */
|
|
POLYGONFILL_DestroyEdgeList(list);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// this is highly hacked from W32kPolygon...
|
|
BOOL
|
|
Polygon ( CONST PPOINT UnsafePoints, int Count, int polyFillMode )
|
|
{
|
|
BOOL ret;
|
|
RECTL DestRect;
|
|
int CurrentPoint;
|
|
PPOINT Points;
|
|
SURFOBJ* SurfObj = 0;
|
|
DC dc;
|
|
PBRUSHOBJ OutBrushObj = 0;
|
|
|
|
dc.CombinedClip = 0;
|
|
dc.w.polyFillMode = polyFillMode;
|
|
|
|
DPRINT1("In W32kPolygon()\n");
|
|
|
|
if ( NULL == UnsafePoints || Count < 2)
|
|
{
|
|
DPRINT1("ERROR_INVALID_PARAMETER\n");
|
|
return FALSE;
|
|
}
|
|
|
|
/* Copy points from userspace to kernelspace */
|
|
Points = (PPOINT)EngAllocMem(0, Count * sizeof(POINT));
|
|
if (NULL == Points)
|
|
{
|
|
DPRINT1("ERROR_NOT_ENOUGH_MEMORY\n");
|
|
return FALSE;
|
|
}
|
|
MmCopyFromCaller(Points, UnsafePoints, Count * sizeof(POINT));
|
|
if ( memcmp ( Points, UnsafePoints, Count * sizeof(POINT) ) )
|
|
{
|
|
free(Points);
|
|
return FALSE;
|
|
}
|
|
|
|
DestRect.left = Points[0].x;
|
|
DestRect.right = Points[0].x;
|
|
DestRect.top = Points[0].y;
|
|
DestRect.bottom = Points[0].y;
|
|
|
|
for (CurrentPoint = 1; CurrentPoint < Count; ++CurrentPoint)
|
|
{
|
|
DestRect.left = MIN(DestRect.left, Points[CurrentPoint].x);
|
|
DestRect.right = MAX(DestRect.right, Points[CurrentPoint].x);
|
|
DestRect.top = MIN(DestRect.top, Points[CurrentPoint].y);
|
|
DestRect.bottom = MAX(DestRect.bottom, Points[CurrentPoint].y);
|
|
}
|
|
|
|
// Draw the Polygon Edges with the current pen
|
|
for (CurrentPoint = 0; CurrentPoint < Count; ++CurrentPoint)
|
|
{
|
|
POINT To, From; //, Next;
|
|
|
|
/* Let CurrentPoint be i
|
|
* if i+1 > Count, Draw a line from Points[i] to Points[0]
|
|
* Draw a line from Points[i] to Points[i+1]
|
|
*/
|
|
From = Points[CurrentPoint];
|
|
if ( CurrentPoint + 1 >= Count)
|
|
{
|
|
To = Points[0];
|
|
}
|
|
else
|
|
{
|
|
To = Points[CurrentPoint + 1];
|
|
}
|
|
|
|
DPRINT1("Polygon Making line from (%d,%d) to (%d,%d)\n", From.x, From.y, To.x, To.y );
|
|
IntEngLineTo(SurfObj,
|
|
dc.CombinedClip,
|
|
OutBrushObj,
|
|
From.x,
|
|
From.y,
|
|
To.x,
|
|
To.y,
|
|
&DestRect,
|
|
EDGE_CHAR); /* MIX */
|
|
}
|
|
/* determine the fill mode to fill the polygon. */
|
|
ret = FillPolygon(&dc, SurfObj, OutBrushObj, FILL_CHAR, Points, Count, DestRect );
|
|
free(Points);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
int main()
|
|
{
|
|
memset ( screen, ' ', sizeof(screen) );
|
|
POINT pts[] =
|
|
{
|
|
#if 0
|
|
{ 0, 0 },
|
|
{ 12, 4 },
|
|
{ 4, 8 },
|
|
#elif 0
|
|
{ 3, 0 },
|
|
{ 0, 3 },
|
|
{ 3, 6 },
|
|
#elif 0
|
|
{ 1, 1 },
|
|
{ 3, 1 },
|
|
{ 3, 3 },
|
|
{ 1, 3 }
|
|
#elif 0
|
|
{ 0, 0 },
|
|
{ 4, 0 },
|
|
{ 4, 4 },
|
|
{ 8, 4 },
|
|
{ 8, 8 },
|
|
{ 4, 8 },
|
|
{ 4, 4 },
|
|
{ 0, 4 },
|
|
#else
|
|
{ 4, 12 },
|
|
{ 12, 0 },
|
|
{ 18, 12 },
|
|
{ 4, 4 },
|
|
{ 20, 4 }
|
|
#endif
|
|
};
|
|
const int pts_count = sizeof(pts)/sizeof(pts[0]);
|
|
|
|
// use ALTERNATE or WINDING for 3rd param
|
|
Polygon ( pts, pts_count, ALTERNATE );
|
|
|
|
// print out our "screen"
|
|
for ( int y = 0; y < SCREENY; y++ )
|
|
{
|
|
for ( int x = 0; x < SCREENX; x++ )
|
|
{
|
|
printf("%c", screen[y][x] );
|
|
}
|
|
printf("\n");
|
|
}
|
|
DPRINT1("Done!\n");
|
|
(void)getch();
|
|
}
|
|
/* EOF */
|