rosapps/dflat32/rect.c

   1 /* ------------- rect.c --------------- */
   2
   3 #include "dflat.h"
   4
   5  /* --- Produce the vector end points produced by the overlap
   6         of two other vectors --- */
   7 static void subVector(int *v1, int *v2,
   8                         int t1, int t2, int o1, int o2)
   9 {
  10     *v1 = *v2 = -1;
  11     if (DfWithin(o1, t1, t2))    {
  12         *v1 = o1;
  13         if (DfWithin(o2, t1, t2))
  14             *v2 = o2;
  15         else
  16             *v2 = t2;
  17     }
  18     else if (DfWithin(o2, t1, t2))    {
  19         *v2 = o2;
  20         if (DfWithin(o1, t1, t2))
  21             *v1 = o1;
  22         else
  23             *v1 = t1;
  24     }
  25     else if (DfWithin(t1, o1, o2))    {
  26         *v1 = t1;
  27         if (DfWithin(t2, o1, o2))
  28             *v2 = t2;
  29         else
  30             *v2 = o2;
  31     }
  32     else if (DfWithin(t2, o1, o2))    {
  33         *v2 = t2;
  34         if (DfWithin(t1, o1, o2))
  35             *v1 = t1;
  36         else
  37             *v1 = o1;
  38     }
  39 }
  40
  41  /* --- Return the rectangle produced by the overlap
  42         of two other rectangles ---- */
  43 DFRECT DfSubRectangle(DFRECT r1, DFRECT r2)
  44 {
  45     DFRECT r = {0,0,0,0};
  46     subVector((int *) &DfRectLeft(r), (int *) &DfRectRight(r),
  47         DfRectLeft(r1), DfRectRight(r1),
  48         DfRectLeft(r2), DfRectRight(r2));
  49     subVector((int *) &DfRectTop(r), (int *) &DfRectBottom(r),
  50         DfRectTop(r1), DfRectBottom(r1),
  51         DfRectTop(r2), DfRectBottom(r2));
  52     if (DfRectRight(r) == -1 || DfRectTop(r) == -1)
  53         DfRectRight(r) =
  54         DfRectLeft(r) =
  55         DfRectTop(r) =
  56         DfRectBottom(r) = 0;
  57     return r;
  58 }
  59
  60 /* ------- return the client rectangle of a window ------ */
  61 DFRECT DfClientRect(void *wnd)
  62 {
  63         DFRECT rc;
  64
  65         if (wnd == NULL)
  66         {
  67                 DfRectLeft(rc) = 1; // DfGetClientLeft((DFWINDOW)wnd);
  68                 DfRectTop(rc) = 2; // DfGetClientTop((DFWINDOW)wnd);
  69                 DfRectRight(rc) = DfGetScreenWidth () - 2; // DfGetClientRight((DFWINDOW)wnd);
  70                 DfRectBottom(rc) = DfGetScreenHeight () - 2; // DfGetClientBottom((DFWINDOW)wnd);
  71                 return rc;
  72         }
  73
  74         DfRectLeft(rc) = DfGetClientLeft((DFWINDOW)wnd);
  75         DfRectTop(rc) = DfGetClientTop((DFWINDOW)wnd);
  76         DfRectRight(rc) = DfGetClientRight((DFWINDOW)wnd);
  77         DfRectBottom(rc) = DfGetClientBottom((DFWINDOW)wnd);
  78
  79         return rc;
  80 }
  81
  82 /* ----- return the rectangle relative to
  83             its window's screen position -------- */
  84 DFRECT DfRelativeWindowRect(void *wnd, DFRECT rc)
  85 {
  86     DfRectLeft(rc) -= DfGetLeft((DFWINDOW)wnd);
  87     DfRectRight(rc) -= DfGetLeft((DFWINDOW)wnd);
  88     DfRectTop(rc) -= DfGetTop((DFWINDOW)wnd);
  89     DfRectBottom(rc) -= DfGetTop((DFWINDOW)wnd);
  90     return rc;
  91 }
  92
  93 /* ----- clip a rectangle to the parents of the window ----- */
  94 DFRECT DfClipRectangle(void *wnd, DFRECT rc)
  95 {
  96     DFRECT sr;
  97     DfRectLeft(sr) = DfRectTop(sr) = 0;
  98     DfRectRight(sr) = DfGetScreenWidth()-1;
  99     DfRectBottom(sr) = DfGetScreenHeight()-1;
 100     if (!DfTestAttribute((DFWINDOW)wnd, DF_NOCLIP))
 101         while ((wnd = DfGetParent((DFWINDOW)wnd)) != NULL)
 102             rc = DfSubRectangle(rc, DfClientRect(wnd));
 103     return DfSubRectangle(rc, sr);
 104 }
 105
 106 /* EOF */