Mega Code Archive
Drawblockdottedlines
<![CDATA[
procedure TDrawStyleObj.DrawBarDots(blocksX, blocksY, imgWidth,
imgHeight: Integer);
{set up dotted lines in the 'drawing area' of the form (ie the image
component) according the number of blocks defined. Later we can then
facilitate some degree of 'snapping' to these lines when bars are
added. This procedure is called every time the user makes a change in
either of the two 'blocks' Combo Boxes...}
var
fullwidth, fullheight: Integer;
dotLineSpaceAcross, dotLineSpaceDown, x, y: Integer;
blocksAcross, blocksDown: Integer;
begin
FillDrawArea;
blocksAcross := blocksX;
blocksDown := blocksY;
fullwidth := imgWidth;
fullheight := imgHeight;
{substitute relevant object for NewStyleForm.DrawArea
below if re-used code...}
with NewStyleForm.DrawArea do
begin
Canvas.Pen.Color := clBlack;
Canvas.Pen.Width := 1;
Canvas.Pen.Style := psDot;
dotLineSpaceAcross := Round(fullWidth / blocksAcross);
dotLineSpaceDown := Round(fullWidth / blocksDown);
x := dotLineSpaceAcross;
y := 0;
while (x < (fullWidth - 1)) do
begin
Canvas.MoveTo(x, y);
Canvas.LineTo(x, fullHeight);
x := x + dotLineSpaceAcross;
end;
x := 0;
y := dotLineSpaceDown;
while (y < (fullHeight - 2)) do
begin
Canvas.MoveTo(x, y);
Canvas.LineTo(fullHeight, y);
y := y + dotLineSpaceDown;
end;
end;
end;
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