protected override bool OnExposeEvent(Gdk.EventExpose evnt)
{
Graphics g = Gtk.DotNet.Graphics.FromDrawable( evnt.Window );
//fill background
Color c1 = this.Color1;
Color c2 = this.Color2;
Rectangle rect = new Rectangle( Allocation.X, Allocation.Y, Allocation.Width, Allocation.Height );
Brush b = new LinearGradientBrush(rect, c1, c2, 90, true );
g.FillRectangle( b, rect );
//draw border
SolidBrush bb = new SolidBrush( Color.FromArgb( 147, 148, 166 ) );
GraphUtil g2 = new GraphUtil( g );
Pen border_pen = new Pen(bb, 1F );
g2.DrawRoundRectangle( border_pen,0, tail_height, Allocation.Width - 2, Allocation.Height - tail_height - 1, round_rect_angle );
//draw tail background again to hide the bottom line
Point[] points = new Point[]
{
new Point( tail_left , tail_height + 1 ),
new Point( tail_left , 0 ),
new Point( tail_width , tail_height + 1 )
};
g.FillPolygon( b, points );
//draw tail border
points = new Point[]
{
new Point( tail_left - 1 , tail_height ),
new Point( tail_left , 1 ),
new Point( tail_width -1 , tail_height )
};
g.DrawLine( border_pen, points[0], points[1] );
g.DrawLine( border_pen, points[1], points[2] );
return base.OnExposeEvent (evnt);
}
private void UpdateCMYK()
{
ColorRGB = GraphUtil.CMYK_to_RGB(ColorCMYK);
UpdatePreview();
}