private void OnCanvasMouseWheel(object sender, MouseWheelEventArgs e)
{
var canvasMousePos = e.GetPosition(TheCanvas);
var scrollerMousePos = e.GetPosition(SV_Container);
if (e.Delta > 0)
{
ZoomFactor *= 1.5;
}
else
{
var z = ZoomFactor;
z /= 1.5;
ZoomFactor = z < 1 ? 1 : z;
}
SV_Container.ScrollToVerticalOffset(canvasMousePos.Y * _scale - scrollerMousePos.Y);
SV_Container.ScrollToHorizontalOffset(canvasMousePos.X * _scale - scrollerMousePos.X);
}
private void TheCanvas_OnMouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
var pos = e.GetPosition(SV_Container);
var canvasPos = e.GetPosition(TheCanvas);
if (_draggedShape != null)
{
DotX = canvasPos.X;
DotY = canvasPos.Y;
}
else if (_dragActive)
{
SV_Container.ScrollToVerticalOffset(_vOffsetOrigin + _start.Y - pos.Y);
SV_Container.ScrollToHorizontalOffset(_hOffsetOrigin + _start.X - pos.X);
}
}
else
{
_dragActive = false;
_draggedShape = null;
}
}