protected override void RenderClientContent(DrawBoard d, UpdateArea updateArea)
{
//1. save canvas origin, (don't forget to restore this)
int enter_canvas_x = d.OriginX;
int enter_canvas_y = d.OriginY;
//d.FillRectangle(Color.FromArgb(100, Color.Yellow),
// _approxRectBounds.Left,
// _approxRectBounds.Top,
// _approxRectBounds.Width,
// _approxRectBounds.Height);
foreach (CustomRenderBox renderE in _controlPoints)
{
int x = renderE.X;
int y = renderE.Y;
//2. set canvas origin
d.SetCanvasOrigin(enter_canvas_x + x, enter_canvas_y + y);
//3. offset update area (see opposite direction)
updateArea.Offset(-x, -y);
//4.
RenderElement.Render(renderE, d, updateArea);
//5. restore only update area back
updateArea.Offset(x, y);
}
//restore enter canvas x, y
d.SetCanvasOrigin(enter_canvas_x, enter_canvas_y);
////lets draw lines that link control points
int j = _controlPoints.Count;
float strokeW = d.StrokeWidth;
Color strokeColor = d.StrokeColor;
d.StrokeWidth = 2;
d.StrokeColor = Color.Black;
for (int i = 1; i < j; ++i)
{
CustomRenderBox b_0 = _controlPoints[i - 1];
CustomRenderBox b_1 = _controlPoints[i];
d.DrawLine(b_0.X, b_0.Y, b_1.X, b_1.Y);
}
{
CustomRenderBox b_0 = _controlPoints[j - 1];
CustomRenderBox b_1 = _controlPoints[0];
d.DrawLine(b_0.X, b_0.Y, b_1.X, b_1.Y);
}
//and the last one
d.StrokeColor = strokeColor;
d.StrokeWidth = strokeW;
}
public static void DrawChildContent(HitTestHint hitTestHint, IEnumerable <RenderElement> drawingIter, DrawBoard d, UpdateArea updateArea)
{
int enter_canvas_x = d.OriginX;
int enter_canvas_y = d.OriginY;
switch (hitTestHint)
{
default:
{
foreach (RenderElement child in drawingIter)
{
if (child.IntersectsWith(updateArea) ||
!child.NeedClipArea)
{
//if the child not need clip
//its children (if exist) may intersect
int x = child.X;
int y = child.Y;
d.SetCanvasOrigin(enter_canvas_x + x, enter_canvas_y + y);
updateArea.Offset(-x, -y);
RenderElement.Render(child, d, updateArea);
updateArea.Offset(x, y);
}
}
//restore
d.SetCanvasOrigin(enter_canvas_x, enter_canvas_y);
}
break;
case HitTestHint.HorizontalRowNonOverlap:
{
bool found = false;
foreach (RenderElement child in drawingIter)
{
if (child.IntersectsWith(updateArea))
{
found = true;
//if the child not need clip
//its children (if exist) may intersect
int x = child.X;
int y = child.Y;
d.SetCanvasOrigin(enter_canvas_x + x, enter_canvas_y + y);
updateArea.Offset(-x, -y);
RenderElement.Render(child, d, updateArea);
updateArea.Offset(x, y);
}
else if (found)
{
break;
}
}
//restore
d.SetCanvasOrigin(enter_canvas_x, enter_canvas_y);
}
break;
case HitTestHint.VerticalColumnNonOverlap:
{
bool found = false;
foreach (RenderElement child in drawingIter)
{
if (child.IntersectsWith(updateArea))
{
found = true;
//if the child not need clip
//its children (if exist) may intersect
int x = child.X;
int y = child.Y;
d.SetCanvasOrigin(enter_canvas_x + x, enter_canvas_y + y);
updateArea.Offset(-x, -y);
RenderElement.Render(child, d, updateArea);
updateArea.Offset(x, y);
}
else if (found)
{
break;
}
}
d.SetCanvasOrigin(enter_canvas_x, enter_canvas_y);
}
break;
}
}