public static bool GradientFill(this Graphics gr, Rectangle rc, Color startColor, Color endColor, FillDirection fillDir)
{
if (DesignMode.IsTrue)
{
using (var pen = new Pen(startColor))
{
if (fillDir == FillDirection.LeftToRight)
{
for (var x = rc.Left; x < rc.Right; x++)
{
pen.Color = ColorEx.InterpolateLinear(startColor, endColor, x, 0, rc.Width);
gr.DrawLine(pen, x, rc.Top, x, rc.Bottom - 1);
}
}
if (fillDir == FillDirection.TopToBottom)
{
for (var y = rc.Top; y < rc.Bottom; y++)
{
pen.Color = ColorEx.InterpolateLinear(startColor, endColor, y, 0, rc.Height);
gr.DrawLine(pen, rc.Left, y, rc.Right - 1, y);
}
}
}
return(false);
}
var tva = new TRIVERTEX[2];
tva[0] = new TRIVERTEX(rc.X, rc.Y, startColor);
tva[1] = new TRIVERTEX(rc.Right, rc.Bottom, endColor);
var gra = new[] { new GRADIENT_RECT(0, 1) };
var hdc = gr.GetHdc();
var ret = NativeMethods.GradientFill(hdc, tva, (uint)tva.Length, gra, (uint)gra.Length, (uint)fillDir);
gr.ReleaseHdc(hdc);
return(ret);
}
internal static extern bool GradientFill(IntPtr hdc, TRIVERTEX[] pVertex, uint dwNumVertex, GRADIENT_RECT[] pMesh, uint dwNumMesh, uint dwMode);
public static bool GradientFill(this Graphics gr, Rectangle rc, Color startColor, Color endColor, FillDirection fillDir)
{
if (DesignMode.IsTrue)
{
using (var pen = new Pen(startColor))
{
if (fillDir == FillDirection.LeftToRight)
{
for (var x = rc.Left; x < rc.Right; x++)
{
pen.Color = ColorEx.InterpolateLinear(startColor, endColor, x, 0, rc.Width);
gr.DrawLine(pen, x, rc.Top, x, rc.Bottom - 1);
}
}
if (fillDir == FillDirection.TopToBottom)
{
for (var y = rc.Top; y < rc.Bottom; y++)
{
pen.Color = ColorEx.InterpolateLinear(startColor, endColor, y, 0, rc.Height);
gr.DrawLine(pen, rc.Left, y, rc.Right - 1, y);
}
}
}
return false;
}
var tva = new TRIVERTEX[2];
tva[0] = new TRIVERTEX(rc.X, rc.Y, startColor);
tva[1] = new TRIVERTEX(rc.Right, rc.Bottom, endColor);
var gra = new[] { new GRADIENT_RECT(0, 1) };
var hdc = gr.GetHdc();
var ret = NativeMethods.GradientFill(hdc, tva, (uint)tva.Length, gra, (uint)gra.Length, (uint)fillDir);
gr.ReleaseHdc(hdc);
return ret;
}
