private Quad MeasureDrawing(DPoint[] strokeToRender, double zoom)
{
var clipRegion = new Quad(0, 0, 0, 0);
try
{
var pts = strokeToRender;
if (pts == null || pts.Length < 1)
{
return(clipRegion);
}
// get size and color from dictionary, or set default
var attr = GetPenAttributes(zoom, pts);
var s = new CoreIncrementalInkStroke(attr, Matrix3x2.Identity);
var minX = pts.Min(p => p.X);
var minY = pts.Min(p => p.Y);
for (int i = 0; i < pts.Length; i++)
{
var current = pts[i];
var zx = ((current.X - minX) * zoom) + minX;
var zy = ((current.Y - minY) * zoom) + minY;
s.AppendInkPoints(new[] {
new InkPoint(new Point(zx, zy), (float)current.Pressure)
});
}
var stroke = s.CreateInkStroke();
if (stroke == null)
{
throw new Exception("Stroke creation failed");
}
var bounds = stroke.BoundingRect;
clipRegion.X = (int)minX - (2 * attr.Size.Width);
clipRegion.Y = (int)minY - (2 * attr.Size.Width);
clipRegion.Width = (int)(bounds.Width + (4 * attr.Size.Width * zoom)) + 2;
clipRegion.Height = (int)(bounds.Height + (4 * attr.Size.Width * zoom)) + 2;
}
catch (Exception ex)
{
Logging.WriteLogMessage(ex.ToString());
}
return(clipRegion);
}
private void DrawToSession([CanBeNull] CanvasDrawingSession g, DPoint[] strokeToRender, [NotNull] Quad clipRegion, double zoom, bool dim = false)
{
try
{
var pts = strokeToRender;
if (pts == null || pts.Length < 1)
{
return;
}
// using the ink infrastructure for drawing...
var strokes = new List <InkStroke>();
var attr = GetPenAttributes(zoom, pts);
if (dim)
{
attr.Color = Color.FromArgb(255, 127, 127, 127);
}
var s = new CoreIncrementalInkStroke(attr, Matrix3x2.Identity);
for (int i = 0; i < pts.Length; i++)
{
var current = pts[i];
s.AppendInkPoints(new[] {
new InkPoint(new Point((current.X - clipRegion.X) * zoom, (current.Y - clipRegion.Y) * zoom), (float)current.Pressure)
});
}
var stroke = s.CreateInkStroke();
if (stroke == null)
{
throw new Exception("Stroke creation failed");
}
strokes.Add(stroke);
g?.DrawInk(strokes); // this call can be *very* slow! It's bad when using wide strokes at high zoom levels.
}
catch (Exception ex)
{
Logging.WriteLogMessage(ex.ToString());
}
}