private void GradientPanel_MouseDown(object sender, MouseEventArgs e)
{
if (CurrentGradient == null)
{
return;
}
activeGradientColorEntry = GetGradientColorEntryFromLocation(e.X);
if (activeGradientColorEntry != null)
{
if (e.Button == MouseButtons.Left)
{
// drag
draggingGradientColorEntryNow = true;
}
else if (e.Button == MouseButtons.Right)
{
// delete
CurrentGradient.ColorEntries.Remove(activeGradientColorEntry);
}
}
else
{
if (e.Button == MouseButtons.Left)
{
// add
double location = GetColorEntryLocationFromX(e.X);
Color color = CurrentGradient.GetColor(location);
CurrentGradient.ColorEntries.Add(new GradientColorEntry(color, location));
}
}
DrawGradient();
CopyBackBufferToScreen();
}
private void DrawGradient()
{
Graphics graphics = Graphics.FromImage(gradientPanelBackBuffer);
graphics.Clear(gradientPanel.BackColor);
if (CurrentGradient != null)
{
Gradient.FillCheckerboardRectangle(graphics, gradientRectangle, 8);
CurrentGradient.Draw(graphics, gradientRectangle, 0.0, 1.0, Gradient.Direction.Horizontal);
graphics.DrawRectangle(Pens.Black, new Rectangle(gradientRectangle.Left - 1, gradientRectangle.Top - 1, gradientRectangle.Width + 2, gradientRectangle.Height + 1));
DrawColorEntryMarkers();
RefreshGradientList(true);
}
graphics.Dispose();
}
