public DrawVisible_Cache(IDrawVisible <IGraphics> next, IDimension cbcol, IDimension cbrow)
{
_cache[0] = new cimg();
_cache[1] = new cimg();
_next = next;
_cbcol = cbcol;
_cbrow = cbrow;
_next.changed += on_chained_change;
_cbcol.changed += on_columnwidth_change;
_cbrow.changed += on_rowheight_change;
}
public void get_image(cimg prev, IDrawVisible <IGraphics> next, CellRange viz, IBoxGetter box, IGraphics gr)
{
range = viz;
double width = 0;
for (int i = range.col_first; i <= range.col_last; i++)
{
double cx;
double cy;
double cwidth;
double cheight;
box.GetBox(i, 0,
out cx,
out cy,
out cwidth,
out cheight
);
if (i == range.col_first)
{
xorigin = cx;
}
width += cwidth;
}
double height = 0;
for (int i = range.row_first; i <= range.row_last; i++)
{
double cx;
double cy;
double cwidth;
double cheight;
box.GetBox(0, i,
out cx,
out cy,
out cwidth,
out cheight
);
if (i == range.row_first)
{
yorigin = cy;
}
height += cheight;
}
//destroy ();
gr.BeginOffscreen((float)width, (float)height, img);
if (
(prev == null) ||
(null == prev.range) ||
(null == prev.range.Intersect(range))
)
{
next.func_draw(-xorigin, -yorigin, range, box, gr);
}
else
{
prev.draw(-xorigin, -yorigin, gr);
List <CellRange> missing = range.Subtract(prev.range);
foreach (CellRange mv in missing)
{
next.func_draw(-xorigin, -yorigin, mv, box, gr);
}
}
img = gr.EndOffscreen();
}
