public void InitSample()
{
for (int i = 0; i < 4; i++)
{
var p = Polygon.GetSampleSquare();
p.Move(new Point(i * 50, i * 50));
polygons.Add(p);
}
}
private void Canvas_MouseDown(object sender, MouseEventArgs e)
{
//handle add sample
if (mouseState == MouseState.PutingSample)
{
var polygon = Polygon.GetSampleSquare();
polygon.Move(e.Location);
polygons.Add(polygon);
OnStructureChanged?.Invoke(this, polygon);
Update();
mouseState = MouseState.Normal;
return;
}
if (currentStructure == null)
{
return;
}
//handle add
if (mouseState == MouseState.Drawing)
{
if (!(currentStructure is Polygon))
{
return;
}
var polygon = currentStructure as Polygon;
var result = polygon.AddVertex(e.Location);
OnStructureChanged?.Invoke(this, polygon);
if (result == Polygon.AddVertexResult.Closed)
{
mouseState = MouseState.Normal;
}
Update();
return;
}
//handle dragging
previousMousePosition = e.Location;
if (currentStructure.HitTest(e.Location))
{
if (mouseState == MouseState.Normal)
{
mouseState = MouseState.Dragging;
}
}
}