图形处理

xkx12 2011-03-03 02:55:23

有个多边形数组点可能画出一个多边形

能否在这个数组点基础上实现向外或向内一个像素画出一个同样的多边形

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lizhibin11 2011-03-03

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class CustomButton : UIElement

    {

        VisualCollection childs;

        DrawingVisual dvrectangle = new DrawingVisual();

        DrawingContext dcrectangle;

        int i = 0;

        Brush bl = Brushes.Blue;

        Brush w = new RadialGradientBrush(Colors.White, Colors.Red);

        Brush bb = new RadialGradientBrush(Colors.Yellow, Colors.Blue);

        Pen p = new Pen(Brushes.Yellow, 3);

        MatrixTransform mt = new MatrixTransform();

        System.Globalization.CultureInfo ci = new System.Globalization.CultureInfo("zh-cn");//FormattedText字体参数

        FlowDirection fd = FlowDirection.LeftToRight;//FormattedText字体参数

        Typeface tf = new Typeface("宋体");//FormattedText字体参数

        double d = 25;//FormattedText字体参数

        FormattedText ft;

        public CustomButton(string s)

        {

            bl.Freeze();

            w.Freeze();

            p.Freeze();

            ft = new FormattedText(s, ci, fd, tf, d, w);

            double fk = ft.Width;

            double fh = ft.Height;

            childs = new VisualCollection(this);

            dcrectangle = dvrectangle.RenderOpen();

            dcrectangle.DrawEllipse(bb, p, new Point(40, 40), 40, 40);

            dcrectangle.DrawText(ft, new Point(40 - fk / 2, 40 - fh / 2));

            dcrectangle.Close();

            dvrectangle.Transform = mt;

            childs.Add(dvrectangle);

            CompositionTarget.Rendering += CompositionTarget_Rendering;

        }

        public void CompositionTarget_Rendering(object sender, EventArgs e)

        {

            double n11 = (Math.Sin(i * 0.2) * 0.2 + 1);

            double m11 = Math.Cos(i * 0.01) * n11;

            double m12 = Math.Sin(i * 0.01) * n11;

            mt.Matrix = new Matrix(m11, m12, -m12, m11, 40 * (1 - m11 + m12), 40 * (1 - m12 - m11));

            i++;

        }

        protected override int VisualChildrenCount

        {

            get { return childs.Count; }

        }

        protected override Visual GetVisualChild(int index)

        {

            if (index < 0 || index >= childs.Count)

            {

                throw new ArgumentOutOfRangeException();

            }

            return childs[index];

        }

    }