// All label-vertexes are assigned the same vertical size independently of text descenders etc.
private Dictionary <Vertex, SKSize> ComputeUniformVertexSizes(IEnumerable <Vertex> vertexes, float textHeight, float padding)
{
SKRect fitRect = MeasureVertexText(vertexes, textHeight);
Dictionary <Vertex, SKSize> vertexSizes = new Dictionary <Vertex, SKSize>();
using (var paint = new SKPaint()) {
paint.TextSize = textHeight; paint.IsAntialias = true; paint.Color = SKColors.Black; paint.IsStroke = false;
var bounds = new SKRect();
foreach (Vertex v in vertexes)
{
if (v is Vertex_Label)
{
float width = GraphLayout.PaintMeasureText(paint, (v as Vertex_Label).Label, ref bounds);
vertexSizes[v] = new SKSize(
width + 2 * padding, // use width, not (bounds.Right - bounds.Left)
(fitRect.Bottom - fitRect.Top) + 2 * padding);
}
else if (v is Vertex_Rectangle)
{
SKSize size = (v as Vertex_Rectangle).Size;
vertexSizes[v] = new SKSize(textHeight * size.Width, textHeight * size.Height);
}
else if (v is Vertex_Routing)
{
vertexSizes[v] = new SKSize(0, 0);
}
}
}
return(vertexSizes);
}
// Get the bounding rect of the text found in all the vertices (used mostly for bounding hight)
private SKRect MeasureVertexText(IEnumerable <Vertex> vertexes, float textHeight)
{
SKRect fitRect = new SKRect(0, 0, 0, 0);
using (var paint = new SKPaint()) {
paint.TextSize = textHeight; paint.IsAntialias = true; paint.Color = SKColors.Black; paint.IsStroke = false;
var bounds = new SKRect();
foreach (Vertex v in vertexes)
{
if (v is Vertex_Label)
{
float width = GraphLayout.PaintMeasureText(paint, (v as Vertex_Label).Label, ref bounds);
fitRect.Left = Math.Min(fitRect.Left, bounds.Left);
fitRect.Top = Math.Min(fitRect.Top, bounds.Top);
fitRect.Right = Math.Max(fitRect.Right, bounds.Right);
fitRect.Bottom = Math.Max(fitRect.Bottom, bounds.Bottom);
}
}
}
return(fitRect);
}
