Visuals/VisualRectangle.cs

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using DrawingPad.Graphics;
using SciencePad;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Shapes;

namespace DrawingPad.Visuals
{
    public class VisualRectangle : VisualGraphics
    {
        #region 常量

        private const int DefaultBorderWidth = 2;

        #endregion

        #region 实例变量

        private Brush brush = PadBrushes.Background;
        private Pen borderPen = Pens.Black;

        private RectangleGeometry geometry;
        private GraphicsRectangle graphicsRect;

        #endregion

        #region 属性

        public override Geometry Geometry { get { return this.geometry; } }

        #endregion

        #region 构造方法

        public VisualRectangle(GraphicsBase graphics) :
            base(graphics)
        {
            this.graphicsRect = graphics as GraphicsRectangle;
        }

        #endregion

        #region DrawableVisual

        protected override void RenderCore(DrawingContext dc)
        {
            if (this.geometry == null)
            {
                this.geometry = new RectangleGeometry();
            }

            this.geometry.Rect = this.graphicsRect.MakeRect();