public void func_draw(double xoff, double yoff, CellRange viz, IBoxGetter box, TGraphics gr)
{
foreach (var dh in draw_handlers)
{
// TODO could do xoff/yoff here and pass zeroes down to the layers
dh.func_draw(xoff, yoff, viz, box, gr);
}
}
public void func_draw(double xoff, double yoff, CellRange viz, IBoxGetter box, IGraphics gr)
{
if (_cache [0].is_usable(viz))
{
_cur = 0;
}
else if (_cache [1].is_usable(viz))
{
_cur = 1;
}
else
{
get_image(_next, viz, box, gr);
}
_cache[_cur].draw(xoff, yoff, gr);
}
private void get_image(IDrawVisible <IGraphics> next, CellRange viz, IBoxGetter box, IGraphics gr)
{
#if true
const int extra_cols = 2;
const int extra_rows = 2;
// TODO we don't want to alloc here
CellRange newrange = new CellRange(
Math.Max(viz.col_first - extra_cols, 0),
viz.col_last + extra_cols, // TODO constrain
Math.Max(viz.row_first - extra_rows, 0),
viz.row_last + extra_rows // TODO constrain
);
#endif
int newcur = (_cur + 1) % 2;
_cache[newcur].get_image(_cache[_cur], next, newrange, box, gr);
_cur = newcur;
}
public void func_draw(double xoff, double yoff, CellRange viz, IBoxGetter box, TGraphics gr)
{
_cd.func_begin_update(viz);
for (int row = viz.row_first; row <= viz.row_last; row++)
{
for (int col = viz.col_first; col <= viz.col_last; col++)
{
double cx;
double cy;
double cwidth;
double cheight;
box.GetBox(col, row,
out cx,
out cy,
out cwidth,
out cheight
);
_cd.func_cell_draw(col, row, xoff + cx, yoff + cy, cwidth, cheight, gr);
}
}
_cd.func_end_update();
}
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();
}
