// Draws a single point
private void DrawPoint(Graphics g, DrawablePoint pt)
{
Pen pen = new Pen(pt.color, 2);
Point pt1 = new Point(pt.x - 2, pt.y - 2);
Rectangle r = new Rectangle(pt1, new Size(4, 4));
g.DrawRectangle(pen, r);
}
// Draws all vertices in the polygon
private void DrawVertices(Graphics g)
{
foreach (DPoint dp in mPolygon.Vertices)
{
DrawablePoint drawable = new DrawablePoint(dp);
DrawPoint(g, drawable);
}
}
// Updates the free point state if polygon's vertices change
private void UpdateFreePointState()
{
for (int i = 0; i < mFreePoints.Count; ++i)
{
DrawablePoint drawable = mFreePoints[i];
DPoint dp = new DPoint(drawable.x, drawable.y);
drawable.color = (mPolygon.isPointInside(dp)) ?
sColorPointInsidePolygon:
sColorPointOutsidePolygon;
}
}
private void OnMouseClickDrawing(object sender, MouseEventArgs e)
{
DPoint pt = new DPoint((double)e.X, (double)e.Y);
if (mCurrentMode == Mode.InsertPolygonNode)
{
mPolygon.AddVertice(pt);
UpdateFreePointState();
mUndoStack.Push(ActionType.VerticeAdded);
}
else
{
Color color = (mPolygon.isPointInside(pt)) ? sColorPointInsidePolygon : sColorPointOutsidePolygon;
DrawablePoint dp = new DrawablePoint(pt, color);
mFreePoints.Add(dp);
mUndoStack.Push(ActionType.PointAdded);
}
DrawObjects();
}