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examples

region.c

region.c 2.10 KB

#ifdef _USE_NEWGAL

static BLOCKHEAP my_cliprc_heap;
static BOOL ch_inited = FALSE;

static void GDIDemo_Region (HWND hWnd, HDC hdc)
{
 CLIPRGN my_cliprgn1;
 CLIPRGN my_cliprgn2;

if (!ch_inited) {
 /* Init the heap used by our region. */
 InitFreeClipRectList (&my_cliprc_heap, 100);
 ch_inited = TRUE;
 }

InitClipRgn (&my_cliprgn1, &my_cliprc_heap);
 InitClipRgn (&my_cliprgn2, &my_cliprc_heap);

/* Create one circle region. */
 InitCircleRegion (&my_cliprgn1, 100, 100, 60);
 /* Create one ellipse region. */
 InitEllipseRegion (&my_cliprgn2, 100, 100, 50, 70);

/* Fill a box to earase the background. */
 SetBrushColor (hdc, PIXEL_blue);
 FillBox (hdc, 0, 0, DEFAULT_WIDTH, 200);

/* Get the difference between two regions. */
 SubtractRegion (&my_cliprgn1, &my_cliprgn1, &my_cliprgn2);
 /* Select the difference region as the current visible region of DC. */
 SelectClipRegion (hdc, &my_cliprgn1);

/* Fill a box, but you will only see red color in the different region. */
 SetBrushColor (hdc, PIXEL_red);
 FillBox (hdc, 0, 0, 180, 200);

/* Do more with XorRegion. */
 InitCircleRegion (&my_cliprgn1, 300, 100, 60);
 OffsetRegion (&my_cliprgn2, 200, 0);

XorRegion (&my_cliprgn1, &my_cliprgn1, &my_cliprgn2);
 SelectClipRegion (hdc, &my_cliprgn1);

FillBox (hdc, 200, 0, 180, 200);

/* Do more with IntersectRegion. */
 InitCircleRegion (&my_cliprgn1, 500, 100, 60);
 OffsetRegion (&my_cliprgn2, 200, 0);

IntersectRegion (&my_cliprgn1, &my_cliprgn1, &my_cliprgn2);
 SelectClipRegion (hdc, &my_cliprgn1);

FillBox (hdc, 400, 0, 180, 200);

/* 
 * Empty two clipping region to free the clipping rectangles used 
 * by them.
 */
 EmptyClipRgn (&my_cliprgn1);
 EmptyClipRgn (&my_cliprgn2);

/* 
 * You should not forget to destroy the FreeClipRectList in your 
 * applications.
 * Here we do not destroy the heap because we will use it in next call.
 *
 * DestroyFreeClipRectList (&my_cliprc_heap);
 * ch_inited = FALSE;
 *
 */
}

#endif /* _USE_NEWGAL */

一键复制编辑原始数据按行查看历史

Vincent Wei 提交于 2017年05月29日 12:20 +08:00 . initical commit

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

#ifdef _USE_NEWGAL

static BLOCKHEAP my_cliprc_heap;
static BOOL ch_inited = FALSE;

static void GDIDemo_Region (HWND hWnd, HDC hdc)
{
 CLIPRGN my_cliprgn1;
 CLIPRGN my_cliprgn2;

 if (!ch_inited) {
 /* Init the heap used by our region. */
 InitFreeClipRectList (&my_cliprc_heap, 100);
 ch_inited = TRUE;
 }

 InitClipRgn (&my_cliprgn1, &my_cliprc_heap);
 InitClipRgn (&my_cliprgn2, &my_cliprc_heap);

 /* Create one circle region. */
 InitCircleRegion (&my_cliprgn1, 100, 100, 60);
 /* Create one ellipse region. */
 InitEllipseRegion (&my_cliprgn2, 100, 100, 50, 70);

 /* Fill a box to earase the background. */
 SetBrushColor (hdc, PIXEL_blue);
 FillBox (hdc, 0, 0, DEFAULT_WIDTH, 200);

 /* Get the difference between two regions. */
 SubtractRegion (&my_cliprgn1, &my_cliprgn1, &my_cliprgn2);
 /* Select the difference region as the current visible region of DC. */
 SelectClipRegion (hdc, &my_cliprgn1);

 /* Fill a box, but you will only see red color in the different region. */
 SetBrushColor (hdc, PIXEL_red);
 FillBox (hdc, 0, 0, 180, 200);

 /* Do more with XorRegion. */
 InitCircleRegion (&my_cliprgn1, 300, 100, 60);
 OffsetRegion (&my_cliprgn2, 200, 0);

 XorRegion (&my_cliprgn1, &my_cliprgn1, &my_cliprgn2);
 SelectClipRegion (hdc, &my_cliprgn1);

 FillBox (hdc, 200, 0, 180, 200);

 /* Do more with IntersectRegion. */
 InitCircleRegion (&my_cliprgn1, 500, 100, 60);
 OffsetRegion (&my_cliprgn2, 200, 0);

 IntersectRegion (&my_cliprgn1, &my_cliprgn1, &my_cliprgn2);
 SelectClipRegion (hdc, &my_cliprgn1);

 FillBox (hdc, 400, 0, 180, 200);

 /* 
 * Empty two clipping region to free the clipping rectangles used 
 * by them.
 */
 EmptyClipRgn (&my_cliprgn1);
 EmptyClipRgn (&my_cliprgn2);

 /* 
 * You should not forget to destroy the FreeClipRectList in your 
 * applications.
 * Here we do not destroy the heap because we will use it in next call.
 *
 * DestroyFreeClipRectList (&my_cliprc_heap);
 * ch_inited = FALSE;
 *
 */
}

#endif /* _USE_NEWGAL */