Graphics基本用法

最新推荐文章于 2023-04-22 08:19:24 发布

原创最新推荐文章于 2023-04-22 08:19:24 发布 · 2.3k 阅读

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#graph #object #button

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本文介绍了如何使用C#在Windows窗体中绘制矩形，包括使用不同方式创建Graphics对象并填充不同类型的矩形，如纯色矩形、线性渐变矩形及路径渐变矩形，并强调了资源释放的重要性。

//使用PaintEventArgs 参数创建Graphics对象 private void Form1_Paint(object sender, PaintEventArgs e) { e.Graphics.FillRectangle(new SolidBrush(Color.Red), 10, 20, 13, 7); } private void button1_Click(object sender, EventArgs e) { Graphics graph; //使用窗口句柄创建Graphics graph = Graphics.FromHwnd(this.Handle); graph.FillRectangle(new SolidBrush(Color.Blue), 30, 20, 13, 7); //使用控件句柄创建Graphics graph = Graphics.FromHwnd(this.pictureBox1.Handle); graph.FillRectangle(new SolidBrush(Color.Red ), 30, 20, 13, 7); //创建梯度 System.Drawing.Drawing2D.LinearGradientBrush lineGrBrush; graph = Graphics.FromHwnd(this.Handle); lineGrBrush = new System.Drawing.Drawing2D.LinearGradientBrush( new Point(10, 30), new Point(30, 40), Color.FromArgb(255, 255, 0, 0), Color.FromArgb (255,0,0,255)); graph.FillRectangle(lineGrBrush, 10, 30, 20, 10); //路径梯度 Rectangle rectSquare; System.Drawing.Drawing2D.GraphicsPath graphPath; System.Drawing.Drawing2D.PathGradientBrush brushSquare; graph = Graphics.FromHwnd(this.Handle); graphPath = new System.Drawing.Drawing2D.GraphicsPath(); rectSquare = new Rectangle(50, 20, 23, 27); graphPath.AddRectangle(rectSquare); brushSquare = new System.Drawing.Drawing2D.PathGradientBrush(graphPath); brushSquare.CenterColor = Color.FromArgb(255, 0, 255, 0); brushSquare.SurroundColors = new Color[] { Color.FromArgb(255, 0, 0, 255) }; graph.FillRectangle(brushSquare, rectSquare); //一定要注意释放资源.... graph.Dispose(); }