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