The following example creates a linear gradient brush and gets the boundary colors. Next, the code uses each of the two colors to create a solid brush. Then, the code fills a rectangle with each solid brush.
C++
VOID Example_GetLinColors(HDC hdc)
{
Graphics myGraphics(hdc);
// Create a linear gradient brush.
LinearGradientBrush linGrBrush(
Rect(0, 0, 100, 50),
Color(255, 0, 0, 0), // black
Color(255, 0, 0, 255), // blue
LinearGradientModeHorizontal);
// Obtain information about the linear gradient brush.
Color colors[2];
linGrBrush.GetLinearColors(colors);
// Fill a small rectangle with each of the two colors.
SolidBrush solidBrush0(colors[0]);
SolidBrush solidBrush1(colors[1]);
myGraphics.FillRectangle(&solidBrush0, 0, 0, 20, 20);
myGraphics.FillRectangle(&solidBrush1, 25, 0, 20, 20);
}
SUB GDIP_GetLineColors (BYVAL hdc AS DWORD)
LOCAL hStatus AS LONG
LOCAL pGraphics AS DWORD
LOCAL pLinBrush AS DWORD
LOCAL colorBlack AS DWORD
LOCAL colorBlue AS DWORD
LOCAL pSolidBrush0 AS DWORD
LOCAL pSolidBrush1 AS DWORD
LOCAL pt1 AS POINTF
LOCAL pt2 AS POINTF
DIM colors(1) AS DWORD
hStatus = GdipCreateFromHDC(hdc, pGraphics)
' // Create a linear gradient brush.
pt1.x = 0 : pt1.y = 0 : pt2.x = 100 : pt2.y = 50
colorBlack = GDIP_ARGB(255, 0, 0, 0)
colorBlue = GDIP_ARGB(255, 0, 0, 255)
hStatus = GdipCreateLineBrush(pt1, pt2, colorBlack, colorBlue, %WrapModeTile, pLinBrush)
' // Obtain information about the linear gradient brush.
hStatus = GdipGetLineColors(pLinBrush, colors(0))
' // Fill a small rectangle with each of the two colors.
hStatus = GdipCreateSolidFill(colors(0), pSolidBrush0)
hStatus = GdipCreateSolidFill(colors(1), pSolidBrush1)
hStatus = GdipFillRectangle(pGraphics, pSolidBrush0, 0, 0, 20, 20)
hStatus = GdipFillRectangle(pGraphics, pSolidBrush1, 25, 0, 20, 20)
' // Cleanup
IF pSolidBrush0 THEN hStatus = GdipDeleteBrush(pSolidBrush0)
IF pSolidBrush1 THEN hStatus = GdipDeleteBrush(pSolidBrush1)
IF pLinBrush THEN GdipDeleteBrush(pLinBrush)
IF pGraphics THEN GdipDeleteGraphics(pGraphics)
END SUB
(http://www.jose.it-berater.org/captures/GdipGetLineColors.png)