void DrawLine(CGPoint pt1, CGPoint pt2, UIColor color)
{
UIGraphics.BeginImageContext(Frame.Size);
using (var g = UIGraphics.GetCurrentContext())
{
Layer.RenderInContext(g);
var path = new CGPath();
path.AddLines(new CGPoint[] { pt1, pt2 });
g.SetLineWidth(3);
color.SetStroke();
g.AddPath(path);
g.DrawPath(CGPathDrawingMode.Stroke);
Image = UIGraphics.GetImageFromCurrentImageContext();
}
UIGraphics.EndImageContext();
LineDrawn?.Invoke(this, EventArgs.Empty);
}
private void SketchCanvasPointerMoved(object sender, global::Windows.UI.Xaml.Input.PointerRoutedEventArgs e)
{
if (e.GetCurrentPoint(this).Properties.IsLeftButtonPressed == false)
{
return;
}
var newPoint = e.GetCurrentPoint(this).Position;
var line = new Line()
{
X1 = oldPoint.X,
Y1 = oldPoint.Y,
X2 = newPoint.X,
Y2 = newPoint.Y,
StrokeThickness = 2.0,
Stroke = brush
};
oldPoint = newPoint;
Children.Add(line);
LineDrawn?.Invoke(this, EventArgs.Empty);
}
void FinishedDrawingSegment()
{
if (lineSegments.Count < Positions.Count - 1)
{
SegmentDrawn?.Invoke();
Vector3 nextSegmentStart = lineSegments[lineSegments.Count - 1].end;
AddSegment(nextSegmentStart, nextSegmentStart);
currentSegmentDirection = Positions[lineSegments.Count] - lineSegments[lineSegments.Count - 1].start;
currentSegmentDirection.Normalize();
}
else
{
LineDrawn?.Invoke();
drawingLine = false;
}
}
public override bool OnTouchEvent(MotionEvent e)
{
switch (e.ActionMasked)
{
case MotionEventActions.Down:
{
int id = e.GetPointerId(0);
var start = new MotionEvent.PointerCoords();
e.GetPointerCoords(id, start);
coords.Add(id, start);
return(true);
}
case MotionEventActions.PointerDown:
{
int id = e.GetPointerId(e.ActionIndex);
var start = new MotionEvent.PointerCoords();
e.GetPointerCoords(id, start);
coords.Add(id, start);
return(true);
}
case MotionEventActions.Move:
{
for (int index = 0; index < e.PointerCount; index++)
{
var id = e.GetPointerId(index);
float x = e.GetX(index);
float y = e.GetY(index);
drawCanvas.DrawLine(coords[id].X, coords[id].Y, x, y, paint);
coords[id].X = x;
coords[id].Y = y;
LineDrawn?.Invoke(this, EventArgs.Empty);
}
Invalidate();
return(true);
}
case MotionEventActions.PointerUp:
{
int id = e.GetPointerId(e.ActionIndex);
coords.Remove(id);
return(true);
}
case MotionEventActions.Up:
{
int id = e.GetPointerId(0);
coords.Remove(id);
return(true);
}
default:
return(false);
}
}
private void ChangeLine(ColorLine line)
{
DrawnLine = line;
LineDrawn?.Invoke();
}
