示例#1
0
        // See if we're over a polygon or corner point.
        private void picCanvas_MouseMove_NotDrawing(object sender, MouseEventArgs e)
        {
            Cursor new_cursor = Cursors.Cross;

            // See what we're over.
            Point mouse_pt = SnapToGrid(e.Location);

            if (MouseUtils.MouseIsOverCornerPoint(mouse_pt, Polygons))
            {
                new_cursor = Cursors.Arrow;
            }
            else if (MouseUtils.MouseIsOverEdge(mouse_pt, Polygons))
            {
                new_cursor = AddPointCursor;
            }
            else if (MouseUtils.MouseIsOverPolygon(mouse_pt, Polygons))
            {
                new_cursor = Cursors.Hand;
            }

            // Set the new cursor.
            if (picCanvas.Cursor != new_cursor)
            {
                picCanvas.Cursor = new_cursor;
            }
        }
示例#2
0
        // Start or continue drawing a new polygon,
        // or start moving a corner or polygon.
        private void picCanvas_MouseDown(object sender, MouseEventArgs e)
        {
            // See what we're over.
            Point   mouse_pt = SnapToGrid(e.Location);
            Polygon hit_polygon;
            int     hit_point, hit_point2;
            Point   closest_point;

            if (NewPolygon != null)
            {
                // We are already drawing a polygon.
                // If it's the right mouse button, finish this polygon.
                if (e.Button == MouseButtons.Right)
                {
                    // Finish this polygon.
                    if (NewPolygon.Count > 2)
                    {
                        Polygons.Add(NewPolygon);
                    }
                    NewPolygon = null;

                    // We no longer are drawing.
                    picCanvas.MouseMove += picCanvas_MouseMove_NotDrawing;
                    picCanvas.MouseMove -= picCanvas_MouseMove_Drawing;
                }
                else
                {
                    // Add a point to this polygon.
                    if (NewPolygon[NewPolygon.Count - 1] != mouse_pt)
                    {
                        NewPolygon.Add(mouse_pt);
                    }
                }
            }
            else if (MouseUtils.MouseIsOverCornerPoint(mouse_pt, Polygons, out hit_polygon, out hit_point))
            {
                // Start dragging this corner.
                picCanvas_MouseDown_MoveCorner(hit_polygon, hit_point, e);
            }
            else if (MouseUtils.MouseIsOverEdge(mouse_pt, Polygons, out hit_polygon,
                                                out hit_point, out hit_point2, out closest_point))
            {
                // Add a point.
                hit_polygon.Insert(hit_point + 1, closest_point);

                // Start dragging this corner.
                picCanvas_MouseDown_MoveCorner(hit_polygon, hit_point + 1, e);
            }
            else if (MouseUtils.MouseIsOverPolygon(mouse_pt, Polygons, out hit_polygon))
            {
                // Start moving this polygon.
                picCanvas.MouseMove -= picCanvas_MouseMove_NotDrawing;
                picCanvas.MouseMove += picCanvas_MouseMove_MovingPolygon;
                picCanvas.MouseUp   += picCanvas_MouseUp_MovingPolygon;

                // Remember the polygon.
                MovingPolygon = hit_polygon;

                // Remember the offset from the mouse to the segment's first point.
                OffsetX = hit_polygon[0].X - e.X;
                OffsetY = hit_polygon[0].Y - e.Y;
            }
            else
            {
                // Start a new polygon.
                NewPolygon = new Polygon();
                NewPoint   = mouse_pt;
                NewPolygon.Add(mouse_pt);

                // Get ready to work on the new polygon.
                picCanvas.MouseMove -= picCanvas_MouseMove_NotDrawing;
                picCanvas.MouseMove += picCanvas_MouseMove_Drawing;
            }

            // Redraw.
            picCanvas.Invalidate();
        }