C# RectangleF.Intersect方法代码示例

        // Draw the elements of the map that lie within the rectange rect
        // into the Graphics g, which already has its world coordinates set up
        // correctly and the clipping region.
        public void Draw(Graphics g, RectangleF rect, RenderOptions renderOpts)
        {
            CheckReadable();

            TraceLine("Begin drawing rectangle ({0},{1})-({2},{3})", rect.Left, rect.Top, rect.Right, rect.Bottom);
            Trace.Indent();

            GraphicsState graphicsState = g.Save();
            GraphicsTarget grTarget = new GraphicsTarget(g);
            try {
                // Get clipping region and bounding rectangle. If the clipping region isn't a rectangle,
                // then it is worth doing extra work to eliminate symbols.
                // UNDONE: clipRegionIsRectangle is given false on full repaint. Need to fix this.
                Region clipRegion;
                rect.Intersect(g.ClipBounds);
                clipRegion = g.Clip.Clone();
                clipRegion.Xor(rect);
                bool clipRegionIsRectangle = clipRegion.IsEmpty(g);
                clipRegion.Dispose();

                g.TextRenderingHint = TextRenderingHint.AntiAlias;

                if (renderOpts.showSymbolBounds)
                    boundsPen = new Pen(Color.FromArgb(100, Color.Red), 0);

                // Draw the image layer.
                DrawColor(grTarget, null, rect, clipRegionIsRectangle, renderOpts);

                // Draw each color separately, to get correct layering.
                foreach (SymColor curColor in colors) {
                    DrawColor(grTarget, curColor, rect, clipRegionIsRectangle, renderOpts);
                }

                if (renderOpts.showSymbolBounds)
                    boundsPen.Dispose();

                Trace.Unindent();
            }
            finally {
                g.Restore(graphicsState);
            }
        }

 public void IntersectTest(float x, float y, float width, float height)
 {
     RectangleF rect1 = new RectangleF(x, y, width, height);
     RectangleF rect2 = new RectangleF(y, x, width, height);
     RectangleF expectedRect = RectangleF.Intersect(rect1, rect2);
     rect1.Intersect(rect2);
     Assert.Equal(expectedRect, rect1);
     Assert.False(rect1.IntersectsWith(expectedRect));
 }

	// Form the intersection of two rectangles.
	public static RectangleF Intersect(RectangleF a, RectangleF b)
			{
				a.Intersect(b);
				return a;
			}