public static extern bool GradientFill(
IntPtr hdc,
TRIVERTEX[] pVertex,
uint dwNumVertex,
GRADIENT_RECT[] pMesh,
uint dwNumMesh,
uint dwMode
);
public static void GradientFill(Graphics g, Rectangle rect, Color startColor, Color endColor, FillDirection fillDir)
{
TRIVERTEX[] vertex = new TRIVERTEX[]
{
new TRIVERTEX(rect.X, rect.Y, startColor),
new TRIVERTEX(rect.Right, rect.Bottom, endColor)
};
GRADIENT_RECT[] grect = new GRADIENT_RECT[] {
new GRADIENT_RECT(0, 1)
};
IntPtr hdc = g.GetHdc();
GradientFill(hdc, vertex, (uint)vertex.Length, grect, (uint)grect.Length, (uint)fillDir);
g.ReleaseHdc(hdc);
}
public static void DrawGradientFill(int dwColour1, int dwColour2, Form myFrm)
{
TRIVERTEX[] vert = new TRIVERTEX[2];
GRADIENT_RECT grRc = new GRADIENT_RECT();
//Colour at upper-left corner
TRIVERTEX with_1 = vert[0];
with_1.x = 0;
with_1.Y = 0;
with_1.Red = LongToSignedShort(((short)(dwColour1 & 0xFF)) * 256);
with_1.Green = LongToSignedShort(System.Convert.ToInt32(((dwColour1 & 0xFF00) / 0x100) * 256));
with_1.Blue = LongToSignedShort(System.Convert.ToInt32(((dwColour1 & 0xFF0000) / 0x10000) * 256));
with_1.Alpha = (short)0;
//Colour at bottom-right corner
TRIVERTEX with_2 = vert[1];
///with_2.x = System.Convert.ToInt32(Microsoft.VisualBasic.Compatibility.VB6.Support.PixelsToTwipsX(myFrm.ClientRectangle.Width) / Microsoft.VisualBasic.Compatibility.VB6.Support.TwipsPerPixelX());
///with_2.Y = System.Convert.ToInt32(Microsoft.VisualBasic.Compatibility.VB6.Support.PixelsToTwipsY(myFrm.ClientRectangle.Height) / Microsoft.VisualBasic.Compatibility.VB6.Support.TwipsPerPixelY());
with_2.Red = LongToSignedShort(((short)(dwColour2 & 0xFF)) * 256);
with_2.Green = LongToSignedShort(System.Convert.ToInt32(((dwColour2 & 0xFF00) / 0x100) * 256));
with_2.Blue = LongToSignedShort(System.Convert.ToInt32(((dwColour2 & 0xFF0000) / 0x10000) * 256));
with_2.Alpha = (short)0;
grRc.LowerRight = 0;
grRc.UpperLeft = 1;
myFrm = new Form();
myFrm.Show();
//parameters:
//hdc - display context handle of the target window
//vert(0) - first member of interest in the vert() array
//2 - number of vert() array members (not ubound(vert))
//grRc - GRADIENT_RECT info
//1 - number of grRc structures passed
//GRADIENT_FILL_RECT_DIRECTION - fill operation -
//will toggle between 0 and 1, the values of
//GRADIENT_FILL_RECT_H and GRADIENT_FILL_RECT_V.
/// GradientFill(myFrm.CreateGraphics().GetHdc().ToInt32(), ref vert[0], 2, ref grRc, 1, System.Math.Abs(GRADIENT_FILL_RECT_DIRECTION));
}
public void FillRect(Rect rect, Color color1, Color color2, bool horizontalGradient)
{
TRIVERTEX[] points = new TRIVERTEX[] { new TRIVERTEX(), new TRIVERTEX() };
points[0].x = rect.left;
points[0].y = rect.top;
points[0].Red = Convert.ToInt16(color1.Red << 8);
points[0].Green = Convert.ToInt16(color1.Green << 8);
points[0].Blue = Convert.ToInt16(color1.Blue << 8);
points[1].x = rect.right;
points[1].y = rect.bottom;
points[1].Red = Convert.ToInt16(color2.Red << 8);
points[1].Green = Convert.ToInt16(color2.Green << 8);
points[1].Blue = Convert.ToInt16(color2.Blue << 8);
GRADIENT_RECT gradientRect = new GRADIENT_RECT(0, 1);
NativeMethods.GradientFill(Handle, points, 2, ref gradientRect, 1, horizontalGradient ? 0 : 1);
}
public static extern bool GradientFill(IntPtr hdc, IntPtr pVertex, uint dwNumVertex, [In] ref GRADIENT_RECT pMesh, uint dwNumMesh, uint dwMode);
internal static extern bool GdiGradientFill(IntPtr hdc, TRIVERTEX[] pVertex, int nVertex, ref GRADIENT_RECT pMesh, int nCount, InTheHand.Drawing.Drawing2D.LinearGradientMode ulMode);
public static extern bool GradientFill(IntPtr hdc, TRIVERTEX[] pVertex, uint nVertex, GRADIENT_RECT[] pMesh, uint nCount, uint ulMode);
private static extern Int32 GradientFill(
IntPtr hdc, TRIVERTEX[] pVertex,
uint dwNumVertex,
GRADIENT_RECT[] pMesh,
uint dwNumMesh,
uint dwMode);
public static void GradientFill(Graphics g, Rectangle rect, Color startColor, Color endColor, FillDirection fillDir)
{
TRIVERTEX[] vertex = new TRIVERTEX[]
{
new TRIVERTEX(rect.X,rect.Y,startColor),
new TRIVERTEX(rect.Right,rect.Bottom,endColor)
};
GRADIENT_RECT[] grect = new GRADIENT_RECT[] {
new GRADIENT_RECT(0,1)
};
IntPtr hdc = g.GetHdc();
GradientFill(hdc, vertex, (uint)vertex.Length, grect, (uint)grect.Length, (uint)fillDir);
g.ReleaseHdc(hdc);
}