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106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/* ------------- rect.c --------------- */
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#include <dflat32/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 (within(o1, t1, t2)) {
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*v1 = o1;
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if (within(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 (within(o2, t1, t2)) {
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*v2 = o2;
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if (within(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 (within(t1, o1, o2)) {
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*v1 = t1;
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if (within(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 (within(t2, o1, o2)) {
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*v2 = t2;
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if (within(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 subRectangle(DFRECT r1, DFRECT r2)
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{
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DFRECT r = {0,0,0,0};
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subVector((int *) &RectLeft(r), (int *) &RectRight(r),
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RectLeft(r1), RectRight(r1),
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RectLeft(r2), RectRight(r2));
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subVector((int *) &RectTop(r), (int *) &RectBottom(r),
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RectTop(r1), RectBottom(r1),
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RectTop(r2), RectBottom(r2));
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if (RectRight(r) == -1 || RectTop(r) == -1)
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RectRight(r) =
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RectLeft(r) =
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RectTop(r) =
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RectBottom(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 ClientRect(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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RectLeft(rc) = 1; // GetClientLeft((DFWINDOW)wnd);
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RectTop(rc) = 2; // GetClientTop((DFWINDOW)wnd);
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RectRight(rc) = DfGetScreenWidth () - 2; // GetClientRight((DFWINDOW)wnd);
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RectBottom(rc) = DfGetScreenHeight () - 2; // GetClientBottom((DFWINDOW)wnd);
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return rc;
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}
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RectLeft(rc) = GetClientLeft((DFWINDOW)wnd);
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RectTop(rc) = GetClientTop((DFWINDOW)wnd);
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RectRight(rc) = GetClientRight((DFWINDOW)wnd);
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RectBottom(rc) = GetClientBottom((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 RelativeWindowRect(void *wnd, DFRECT rc)
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{
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RectLeft(rc) -= GetLeft((DFWINDOW)wnd);
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RectRight(rc) -= GetLeft((DFWINDOW)wnd);
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RectTop(rc) -= GetTop((DFWINDOW)wnd);
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RectBottom(rc) -= GetTop((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 ClipRectangle(void *wnd, DFRECT rc)
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{
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DFRECT sr;
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RectLeft(sr) = RectTop(sr) = 0;
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RectRight(sr) = DfGetScreenWidth()-1;
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RectBottom(sr) = DfGetScreenHeight()-1;
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if (!TestAttribute((DFWINDOW)wnd, NOCLIP))
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while ((wnd = GetParent((DFWINDOW)wnd)) != NULL)
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rc = subRectangle(rc, ClientRect(wnd));
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return subRectangle(rc, sr);
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}
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/* EOF */
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