Using Win32 functions in Visual FoxPro Image Gallery
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GDI+: creating a gradient
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GDI+: creating a gradient

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Before you begin:

The code is based on custom GDI+ class. Download the class module first and save it in gdiplus.prg file.
SET PROCEDURE TO gdiplus ADDITIVE
DO declare

PRIVATE gdiplus as gdiplusinit
gdiplus = CREATEOBJECT("gdiplusinit")

LOCAL oBitmap as gdibitmap
cFilename = "gradientsample.png"
nImgWidth = 300
nImgHeight = 300

oBitmap = CREATEOBJECT("gdibitmap",;
    nImgWidth, nImgHeight)

WITH oBitmap
    .graphics.FillRectangle(;
            ARGB(255,255,255, 255),;
            0,;
            0,;
            .imgwidth,;
            .imgheight)
ENDWITH

nPointCount = 128
nRadius = 120
cPoints = GeneratesCirclePoints(;
    nImgWidth/2,;
    nImgHeight/2,;
    nRadius,;
    nPointCount)

hBrush = 0
GdipCreatePathGradientI(;
    @cPoints, nPointCount, 4, @hBrush)

IF hBrush <> 0
    nColor1 = ARGB(0,156,0, 255)
    nColor2 = ARGB(230,255,230, 64)

    GdipSetPathGradientCenterColor(hBrush, nColor1)

    cColors = num2dword(nColor2)
    nColorCount = 1
    GdipSetPathGradientSurroundColorsWithCount(;
        hBrush, @cColors, @nColorCount)

    cPoints = num2dword(130) +;
        num2dword(140)

    GdipSetPathGradientCenterPointI(;
        hBrush, @cPoints)

    GdipFillRectangle(;
        oBitmap.graphics.graphics, hBrush,;
        0, 0, nImgWidth, nImgHeight)

    GdipDeleteBrush(hBrush)
ENDIF

oBitmap.SaveToFile(cFilename)
ShellExecute(0, "open", cFilename, "", "", 3)

oBitmap=NULL
gdiplus=NULL
* end of main

PROCEDURE GeneratesCirclePoints(;
    nAxisX, nAxisY, nRadius, nPointCount)
* generates a series of points forming a circle
    LOCAL nStep, nAngle, cResult
    nStep = (2 * PI()) / nPointCount

    cResult = ""
    FOR nAngle = 0 TO (2 * PI()) STEP nStep
        cResult = cResult +;
            num2dword(nAxisX + nRadius * COS(nAngle)) +;
            num2dword(nAxisY + nRadius * SIN(nAngle))
    NEXT
RETURN cResult

PROCEDURE declare
    DECLARE INTEGER ShellExecute IN shell32; 
        INTEGER hWindow, STRING lpOperation,; 
        STRING lpFile, STRING lpParameters,;  
        STRING lpDirectory, INTEGER nShowCmd

    DECLARE INTEGER GdipCreatePathGradientI IN gdiplus;
        STRING @points, INTEGER pointcount,;
        INTEGER wrapMode, INTEGER @polyGradient

    DECLARE INTEGER GdipSetPathGradientCenterColor IN gdiplus;
        INTEGER brush, INTEGER colors

    DECLARE INTEGER GdipSetPathGradientSurroundColorsWithCount;
    IN gdiplus;
        INTEGER brush, STRING @argbColor, INTEGER @colorcount

    DECLARE INTEGER GdipSetPathGradientCenterPointI IN gdiplus;
        INTEGER brush, STRING @points

    DECLARE INTEGER GdipGetPathGradientCenterPointI IN gdiplus;
        INTEGER brush, STRING @points

FUNCTION num2dword(lnValue)
#DEFINE m0 0x0000100
#DEFINE m1 0x0010000
#DEFINE m2 0x1000000
    IF lnValue < 0
        lnValue = 0x100000000 + lnValue
    ENDIF
    LOCAL b0, b1, b2, b3
    b3 = Int(lnValue/m2)
    b2 = Int((lnValue - b3*m2)/m1)
    b1 = Int((lnValue - b3*m2 - b2*m1)/m0)
    b0 = Mod(lnValue, m0)
RETURN Chr(b0)+Chr(b1)+Chr(b2)+Chr(b3)

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2754 bytes  
Created: 2013-12-02 11:44:22  
Modified: 2013-12-02 11:56:34  
Visits in 7 days: 147  
Listed functions:
GdipCreatePathGradientI
GdipSetPathGradientCenterColor
GdipSetPathGradientCenterPointI
ShellExecute
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