The following example creates a region from a path and gets a set of rectangles that approximate the region. The code then draws each of the rectangles.
C++
VOID Example_GetRegionScansRectF(HDC hdc)
{
Graphics graphics(hdc);
SolidBrush solidBrush(Color(255, 255, 0, 0));
Pen pen(Color(255, 0, 0, 0));
GraphicsPath path;
Matrix matrix;
RectF* rects = NULL;
INT count = 0;
// Create a region from a path.
path.AddEllipse(10, 10, 50, 300);
Region pathRegion(&path);
graphics.FillRegion(&solidBrush, &pathRegion);
// Get the rectangles.
graphics.GetTransform(&matrix);
count = pathRegion.GetRegionScansCount(&matrix);
rects = (RectF*)malloc(count*sizeof(RectF));
pathRegion.GetRegionScans(&matrix, rects, &count);
// Draw the rectangles.
for(INT j = 0; j < count; ++j)
graphics.DrawRectangle(&pen, rects[j]);
free(rects);
}
SUB GDIP_GetRegionScans (BYVAL hdc AS DWORD)
LOCAL hStatus AS LONG
LOCAL pGraphics AS DWORD
LOCAL pPath AS DWORD
LOCAL pSolidBrush AS DWORD
LOCAl pPen AS DWORD
LOCAL pPathRegion AS DWORD
LOCAL pMatrix AS DWORD
LOCAL count AS LONG
LOCAL j AS LONG
DIM rects(0) AS RECTF
hStatus = GdipCreateFromHDC(hdc, pGraphics)
hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pSolidBrush)
hStatus = GdipCreatePen1(GDIP_ARGB(255, 0, 0, 0), 1.0, %UnitWorld, pPen)
hStatus = GdipCreatePath(%FillModeAlternate, pPath)
hStatus = GdipCreateMatrix(pMatrix)
' // Create a region from a path.
hStatus = GdipAddPathEllipseI(pPath, 10, 10, 50, 300)
hStatus = GdipCreateRegionPath(pPath, pPathRegion)
' // Get the rectangles.
hStatus = GdipGetWorldTransform(pGraphics, pMatrix)
hStatus = GdipGetRegionScansCount(pPathRegion, count, pMatrix)
REDIM rects(count - 1)
hStatus = GdipGetRegionScans(pPathRegion, rects(0), count, pMatrix)
' // Draw the rectangles.
FOR j = 0 TO count - 1
hStatus = GdipDrawRectangle(pGraphics, pPen, rects(j).x, rects(j).y, rects(j).Width, rects(j).Height)
NEXT
' // Cleanup
IF pMatrix THEN GdipDeleteMatrix(pMatrix)
IF pPen THEN GdipDeletePen(pPen)
IF pPathRegion THEN GdipDeleteRegion(pPathRegion)
IF pSolidBrush THEN GdipDeleteBrush(pSolidBrush)
IF pPath THEN GdipDeletePath(pPath)
IF pGraphics THEN GdipDeleteGraphics(pGraphics)
END SUB
The following illustration shows the output of the preceding code.
(http://www.jose.it-berater.org/captures/GdipGetRegionScans.png)
The following example creates a region from a path and gets a set of rectangles that approximate the region. The code then draws each of the rectangles.
C++
VOID Example_GetRegionScansRect(HDC hdc)
{
Graphics graphics(hdc);
SolidBrush solidBrush(Color(255, 255, 0, 0));
Pen pen(Color(255, 0, 0, 0));
GraphicsPath path;
Matrix matrix;
Rect* rects = NULL;
INT count = 0;
// Create a region from a path.
path.AddEllipse(10, 10, 50, 300);
Region pathRegion(&path);
graphics.FillRegion(&solidBrush, &pathRegion);
// Get the rectangles.
graphics.GetTransform(&matrix);
count = pathRegion.GetRegionScansCount(&matrix);
rects = (Rect*)malloc(count*sizeof(Rect));
pathRegion.GetRegionScans(&matrix, rects, &count);
// Draw the rectangles.
for(INT j = 0; j < count; ++j)
graphics.DrawRectangle(&pen, rects[j]);
free(rects);
}
SUB GDIP_GetRegionScansI (BYVAL hdc AS DWORD)
LOCAL hStatus AS LONG
LOCAL pGraphics AS DWORD
LOCAL pPath AS DWORD
LOCAL pSolidBrush AS DWORD
LOCAl pPen AS DWORD
LOCAL pPathRegion AS DWORD
LOCAL pMatrix AS DWORD
LOCAL count AS LONG
LOCAL j AS LONG
DIM rects(0) AS RECTL
hStatus = GdipCreateFromHDC(hdc, pGraphics)
hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pSolidBrush)
hStatus = GdipCreatePen1(GDIP_ARGB(255, 0, 0, 0), 1.0, %UnitWorld, pPen)
hStatus = GdipCreatePath(%FillModeAlternate, pPath)
hStatus = GdipCreateMatrix(pMatrix)
' // Create a region from a path.
hStatus = GdipAddPathEllipseI(pPath, 10, 10, 50, 300)
hStatus = GdipCreateRegionPath(pPath, pPathRegion)
' // Get the rectangles.
hStatus = GdipGetWorldTransform(pGraphics, pMatrix)
hStatus = GdipGetRegionScansCount(pPathRegion, count, pMatrix)
REDIM rects(count - 1)
hStatus = GdipGetRegionScansI(pPathRegion, rects(0), count, pMatrix)
' // Draw the rectangles.
FOR j = 0 TO count - 1
hStatus = GdipDrawRectangleI(pGraphics, pPen, rects(j).nLeft, rects(j).nTop, rects(j).nRight, rects(j).nBottom)
NEXT
' // Cleanup
IF pMatrix THEN GdipDeleteMatrix(pMatrix)
IF pPen THEN GdipDeletePen(pPen)
IF pPathRegion THEN GdipDeleteRegion(pPathRegion)
IF pSolidBrush THEN GdipDeleteBrush(pSolidBrush)
IF pPath THEN GdipDeletePath(pPath)
IF pGraphics THEN GdipDeleteGraphics(pGraphics)
END SUB
The following illustration shows the output of the preceding code.
(http://www.jose.it-berater.org/captures/GdipGetRegionScansI.png)
The following example creates a region from a path and gets a set of rectangles that approximate the region. The code then draws each of the rectangles.
PowerBASIC
SUB GDIP_GetRegionScans (BYVAL hdc AS DWORD)
LOCAL hStatus AS LONG
LOCAL pGraphics AS DWORD
LOCAL pPath AS DWORD
LOCAL pSolidBrush AS DWORD
LOCAl pPen AS DWORD
LOCAL pPathRegion AS DWORD
LOCAL pMatrix AS DWORD
LOCAL count AS LONG
DIM rects(0) AS RECTF
hStatus = GdipCreateFromHDC(hdc, pGraphics)
hStatus = GdipCreateSolidFill(GDIP_ARGB(255, 255, 0, 0), pSolidBrush)
hStatus = GdipCreatePen1(GDIP_ARGB(255, 0, 0, 0), 1.0, %UnitWorld, pPen)
hStatus = GdipCreatePath(%FillModeAlternate, pPath)
hStatus = GdipCreateMatrix(pMatrix)
' // Create a region from a path.
hStatus = GdipAddPathEllipseI(pPath, 10, 10, 50, 300)
hStatus = GdipCreateRegionPath(pPath, pPathRegion)
' // Get the rectangles.
hStatus = GdipGetWorldTransform(pGraphics, pMatrix)
hStatus = GdipGetRegionScansCount(pPathRegion, count, pMatrix)
REDIM rects(count - 1)
hStatus = GdipGetRegionScans(pPathRegion, rects(0), count, pMatrix)
' // Draw the rectangles.
hStatus = GdipDrawRectangles(pGraphics, pPen, rects(0), count)
' // Cleanup
IF pMatrix THEN GdipDeleteMatrix(pMatrix)
IF pPen THEN GdipDeletePen(pPen)
IF pPathRegion THEN GdipDeleteRegion(pPathRegion)
IF pSolidBrush THEN GdipDeleteBrush(pSolidBrush)
IF pPath THEN GdipDeletePath(pPath)
IF pGraphics THEN GdipDeleteGraphics(pGraphics)
END SUB
The following illustration shows the output of the preceding code.
(http://www.jose.it-berater.org/captures/GdipGetRegionScans.png)