// This method wraps the PInvoke to GradientFill.
// Parmeters:
// gr - The Graphics object we are filling
// rc - The rectangle to fill
// startColor - The starting color for the fill
// endColor - The ending color for the fill
// fillDir - The direction to fill
//
// Returns true if the call to GradientFill succeeded; false
// otherwise.
public static bool Fill(
Graphics gr,
Rectangle rc,
Color startColor, Color endColor,
FillDirection fillDir)
{
// Initialize the data to be used in the call to GradientFill.
Win32Helper.TRIVERTEX[] tva = new Win32Helper.TRIVERTEX[2];
tva[0] = new Win32Helper.TRIVERTEX(rc.X, rc.Y, startColor);
tva[1] = new Win32Helper.TRIVERTEX(rc.Right, rc.Bottom, endColor);
Win32Helper.GRADIENT_RECT[] gra = new Win32Helper.GRADIENT_RECT[] {
new Win32Helper.GRADIENT_RECT(0, 1)};
// Get the hDC from the Graphics object.
IntPtr hdc = gr.GetHdc();
// PInvoke to GradientFill.
bool b;
b = Win32Helper.GradientFill(
hdc,
tva,
(uint)tva.Length,
gra,
(uint)gra.Length,
(uint)fillDir);
System.Diagnostics.Debug.Assert(b, string.Format(
"GradientFill failed: {0}",
System.Runtime.InteropServices.Marshal.GetLastWin32Error()));
// Release the hDC from the Graphics object.
gr.ReleaseHdc(hdc);
return b;
}
public static bool Fill(Graphics gr, Rectangle rc, Color startColor, Color middleColor1, Color middleColor2, Color endColor, FillDirection fillDirection)
{
bool flag = (middleColor1 != Color.Transparent) | (middleColor2 != Color.Transparent);
if (Environment.OSVersion.Platform != PlatformID.WinCE)
{
return FillManagedWithMiddle(gr, rc, startColor, middleColor1, middleColor2, endColor, fillDirection);
}
int num = 2;
if (flag)
{
num += 2;
}
Win32Helper.TRIVERTEX[] pVertex = new Win32Helper.TRIVERTEX[num];
pVertex[0] = new Win32Helper.TRIVERTEX(rc.X, rc.Y, startColor);
if (flag)
{
if (middleColor1 == Color.Transparent)
{
middleColor1 = middleColor2;
}
if (middleColor2 == Color.Transparent)
{
middleColor2 = middleColor1;
}
if (fillDirection == FillDirection.Horizontal)
{
pVertex[1] = new Win32Helper.TRIVERTEX(rc.X + (rc.Width / 2), rc.Bottom, middleColor1);
pVertex[2] = new Win32Helper.TRIVERTEX(rc.X + (rc.Width / 2), rc.Y, middleColor2);
}
else
{
pVertex[1] = new Win32Helper.TRIVERTEX(rc.Right, rc.Y + (rc.Height / 2), middleColor1);
pVertex[2] = new Win32Helper.TRIVERTEX(rc.X, rc.Y + (rc.Height / 2), middleColor2);
}
}
pVertex[num - 1] = new Win32Helper.TRIVERTEX(rc.Right, rc.Bottom, endColor);
Win32Helper.GRADIENT_RECT[] pMesh = null;
if (flag)
{
pMesh = new Win32Helper.GRADIENT_RECT[] { new Win32Helper.GRADIENT_RECT(0, 1), new Win32Helper.GRADIENT_RECT(2, 3) };
}
else
{
pMesh = new Win32Helper.GRADIENT_RECT[] { new Win32Helper.GRADIENT_RECT(0, 1) };
}
IntPtr hdc = gr.GetHdc();
bool flag2 = false;
try
{
flag2 = Win32Helper.GradientFill(hdc, pVertex, (uint) pVertex.Length, pMesh, (uint) pMesh.Length, (uint) fillDirection);
gr.ReleaseHdc(hdc);
}
catch (Exception)
{
gr.ReleaseHdc(hdc);
flag2 = FillManagedWithMiddle(gr, rc, startColor, middleColor1, middleColor2, endColor, fillDirection);
}
return flag2;
}
