private void chain_draw(DrawCellFunc <TGraphics> next, int col, int row, double x, double y, double width, double height, TGraphics gr)
{
TImage img;
if (!_cache.find(col, row, out img))
{
img = draw(next, col, row, width, height, gr);
_cache.add(col, row, img);
}
draw_image(gr, img, x, y);
}
private static void chain_draw(DrawCellFunc <TGraphics> next, Padding?pad, int col, int row, double x, double y, double width, double height, TGraphics gr)
{
if (pad.HasValue)
{
Padding t = pad.Value;
next(
col,
row,
x + t.Left,
y + t.Top,
width - (t.Left + t.Right),
height - (t.Top + t.Bottom),
gr
);
}
else
{
next(col, row, x, y, width, height, gr);
}
}
protected override IImage draw(DrawCellFunc <IGraphics> next, int col, int row, double width, double height, IGraphics gr)
{
gr.BeginOffscreen((float)width, (float)height, null);
next(col, row, 0, 0, width, height, gr);
return(gr.EndOffscreen());
}
protected abstract TImage draw(DrawCellFunc <TGraphics> next, int col, int row, double width, double height, TGraphics gr);
