private void Canvas_MouseUp(object sender, MouseEventArgs e)
{
canvas.Focus();
if (e.Button == MouseButtons.Left && selectionBegin)
{
canvas.UnselectAll();
PointF selectionStart = selectionBox.Points[0];
PointF selectionEnd = selectionBox.Points[2];
PointF selectionOrigin = new PointF();
SizeF selectionSize = new SizeF();
selectionSize.Width = Math.Abs(selectionEnd.X - selectionStart.X);
selectionSize.Height = Math.Abs(selectionEnd.Y - selectionStart.Y);
if (selectionEnd.X > selectionStart.X)
{
if (selectionEnd.Y > selectionStart.Y)
{
selectionOrigin.X = selectionStart.X;
selectionOrigin.Y = selectionStart.Y;
}
else
{
selectionOrigin.X = selectionStart.X;
selectionOrigin.Y = selectionEnd.Y;
}
}
else
{
if (selectionEnd.Y > selectionStart.Y)
{
selectionOrigin.X = selectionEnd.X;
selectionOrigin.Y = selectionStart.Y;
}
else
{
selectionOrigin.X = selectionEnd.X;
selectionOrigin.Y = selectionEnd.Y;
}
}
RectangleF rect = new RectangleF(selectionOrigin.X,
selectionOrigin.Y,
selectionSize.Width,
selectionSize.Height);
float square = selectionSize.Width * selectionSize.Height;
if (square >= 4.0F)
{
List <CanvasItem> items = canvas.BoxTest(rect);
if (items.Count != 0)
{
foreach (var item in items)
{
item.Select();
}
canvas.Invalidate();
}
}
canvas.RemoveItem(selectionBox);
selectionBox = null;
selectionBegin = false;
canvas.Invalidate();
}
else if (e.Button == MouseButtons.Left && draggingBegin)
{
draggingBegin = false;
canvas.Cursor = Cursors.Default;
}
else if (e.Button == MouseButtons.Right && scrollingBegin)
{
scrollingBegin = false;
canvas.Cursor = Cursors.Default;
}
}
