reactos/rosapps/dflat32/rect.c

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/* ------------- rect.c --------------- */
#include "dflat.h"
/* --- Produce the vector end points produced by the overlap
of two other vectors --- */
static void subVector(int *v1, int *v2,
int t1, int t2, int o1, int o2)
{
*v1 = *v2 = -1;
if (DfWithin(o1, t1, t2)) {
*v1 = o1;
if (DfWithin(o2, t1, t2))
*v2 = o2;
else
*v2 = t2;
}
else if (DfWithin(o2, t1, t2)) {
*v2 = o2;
if (DfWithin(o1, t1, t2))
*v1 = o1;
else
*v1 = t1;
}
else if (DfWithin(t1, o1, o2)) {
*v1 = t1;
if (DfWithin(t2, o1, o2))
*v2 = t2;
else
*v2 = o2;
}
else if (DfWithin(t2, o1, o2)) {
*v2 = t2;
if (DfWithin(t1, o1, o2))
*v1 = t1;
else
*v1 = o1;
}
}
/* --- Return the rectangle produced by the overlap
of two other rectangles ---- */
DFRECT DfSubRectangle(DFRECT r1, DFRECT r2)
{
DFRECT r = {0,0,0,0};
subVector((int *) &DfRectLeft(r), (int *) &DfRectRight(r),
DfRectLeft(r1), DfRectRight(r1),
DfRectLeft(r2), DfRectRight(r2));
subVector((int *) &DfRectTop(r), (int *) &DfRectBottom(r),
DfRectTop(r1), DfRectBottom(r1),
DfRectTop(r2), DfRectBottom(r2));
if (DfRectRight(r) == -1 || DfRectTop(r) == -1)
DfRectRight(r) =
DfRectLeft(r) =
DfRectTop(r) =
DfRectBottom(r) = 0;
return r;
}
/* ------- return the client rectangle of a window ------ */
DFRECT DfClientRect(void *wnd)
{
DFRECT rc;
if (wnd == NULL)
{
DfRectLeft(rc) = 1; // DfGetClientLeft((DFWINDOW)wnd);
DfRectTop(rc) = 2; // DfGetClientTop((DFWINDOW)wnd);
DfRectRight(rc) = DfGetScreenWidth () - 2; // DfGetClientRight((DFWINDOW)wnd);
DfRectBottom(rc) = DfGetScreenHeight () - 2; // DfGetClientBottom((DFWINDOW)wnd);
return rc;
}
DfRectLeft(rc) = DfGetClientLeft((DFWINDOW)wnd);
DfRectTop(rc) = DfGetClientTop((DFWINDOW)wnd);
DfRectRight(rc) = DfGetClientRight((DFWINDOW)wnd);
DfRectBottom(rc) = DfGetClientBottom((DFWINDOW)wnd);
return rc;
}
/* ----- return the rectangle relative to
its window's screen position -------- */
DFRECT DfRelativeWindowRect(void *wnd, DFRECT rc)
{
DfRectLeft(rc) -= DfGetLeft((DFWINDOW)wnd);
DfRectRight(rc) -= DfGetLeft((DFWINDOW)wnd);
DfRectTop(rc) -= DfGetTop((DFWINDOW)wnd);
DfRectBottom(rc) -= DfGetTop((DFWINDOW)wnd);
return rc;
}
/* ----- clip a rectangle to the parents of the window ----- */
DFRECT DfClipRectangle(void *wnd, DFRECT rc)
{
DFRECT sr;
DfRectLeft(sr) = DfRectTop(sr) = 0;
DfRectRight(sr) = DfGetScreenWidth()-1;
DfRectBottom(sr) = DfGetScreenHeight()-1;
if (!DfTestAttribute((DFWINDOW)wnd, DF_NOCLIP))
while ((wnd = DfGetParent((DFWINDOW)wnd)) != NULL)
rc = DfSubRectangle(rc, DfClientRect(wnd));
return DfSubRectangle(rc, sr);
}
/* EOF */