private void ControlLineEndThumb_DragDelta(object sender, DragDeltaEventArgs e)
{
var thumb = sender as Thumb;
Canvas canvas = ControlLine.ControlLineCanvas.canvas;
Point endPos = ControlLine.End.GetPos(e.HorizontalChange, e.VerticalChange);
Point startPos = ControlLine.Start.GetPos();
if (endPos.X < 0)
{
endPos.X = 0;
}
else if (endPos.X > canvas.ActualWidth - ControlLine.End.ActualWidth)
{
endPos.X = canvas.ActualWidth - ControlLine.End.ActualWidth;
}
if (endPos.Y < 0)
{
endPos.Y = 0;
}
else if (endPos.Y > canvas.ActualHeight - ControlLine.End.ActualHeight)
{
endPos.Y = canvas.ActualHeight - ControlLine.End.ActualHeight;
}
Vector v = Point.Subtract(endPos, startPos);
ControlLine.End.SetPos(endPos);
ControlLine.Mid.SetPos(new Point(startPos.X + v.X / 2, startPos.Y + v.Y / 2));
ControlLine.UpdateLine();
thumb.UpdateLayout();
e.Handled = true;
}
private void ControlLineMidThumb_DragDelta(object sender, DragDeltaEventArgs e)
{
var thumb = sender as Thumb;
Canvas canvas = ControlLine.ControlLineCanvas.canvas;
Point startPos = ControlLine.Start.GetPos(e.HorizontalChange, e.VerticalChange);
Point midPos = ControlLine.Mid.GetPos(e.HorizontalChange, e.VerticalChange);
Point endPos = ControlLine.End.GetPos(e.HorizontalChange, e.VerticalChange);
double canvasWidth = canvas.ActualWidth;
double canvasHeight = canvas.ActualHeight;
double startWidth = ControlLine.Start.ActualWidth;
double startHeight = ControlLine.Start.ActualHeight;
double endWidth = ControlLine.End.ActualWidth;
double endHeight = ControlLine.End.ActualHeight;
if (startPos.X < 0)
{
double diff = 0 - startPos.X;
startPos.X += diff;
midPos.X += diff;
endPos.X += diff;
}
else if (startPos.X > canvasWidth - startWidth)
{
double diff = startPos.X - canvasWidth + startWidth;
startPos.X -= diff;
midPos.X -= diff;
endPos.X -= diff;
}
if (startPos.Y < 0)
{
double diff = 0 - startPos.Y;
startPos.Y += diff;
midPos.Y += diff;
endPos.Y += diff;
}
else if (startPos.Y > canvasHeight - startHeight)
{
double diff = startPos.Y - canvasHeight + startHeight;
startPos.Y -= diff;
midPos.Y -= diff;
endPos.Y -= diff;
}
if (endPos.X < 0)
{
double diff = 0 - endPos.X;
startPos.X += diff;
midPos.X += diff;
endPos.X += diff;
}
else if (endPos.X > canvasWidth - endWidth)
{
double diff = endPos.X - canvasWidth + endWidth;
startPos.X -= diff;
midPos.X -= diff;
endPos.X -= diff;
}
if (endPos.Y < 0)
{
double diff = 0 - endPos.Y;
startPos.Y += diff;
midPos.Y += diff;
endPos.Y += diff;
}
else if (endPos.Y > canvasHeight - endHeight)
{
double diff = endPos.Y - canvasHeight + endHeight;
startPos.Y -= diff;
midPos.Y -= diff;
endPos.Y -= diff;
}
ControlLine.Start.SetPos(startPos);
ControlLine.Mid.SetPos(midPos);
ControlLine.End.SetPos(endPos);
ControlLine.UpdateLine();
thumb.UpdateLayout();
e.Handled = true;
}
