winform GDI+ 画扇形想消除一部分怎么做

2015-12-21 11:45:19 286 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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如何消除黑框里的部分只剩下圆环的那部分
代码如下

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Drawing.Drawing2D;

using System.IO;



namespace _64格子

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

            this.DoubleBuffered = true;//开启双缓冲，减少闪烁

        }

        public int k;

        public int j;

        int r;

        public int l;

        Bitmap bmp;

        Graphics g;

        private void Form1_Load(object sender, EventArgs e)

        {

            k = -750;

            j = -375;

            r = 1500;

            //timer1.Start();

            l = 0;

        }



        private void Form1_Paint(object sender, PaintEventArgs e)

        {

            

            bmp = new Bitmap(this.Width,this.Height);          

            Pen pen = new Pen(Color.Red, 1);

            g = Graphics.FromImage(bmp);

            g.SmoothingMode = SmoothingMode.AntiAlias;

            g.DrawPie(pen, k, j, r, r, -15, 30);

            g.DrawPie(pen, k, j, r, r, 0, 30);

            for (double n = 500; n <= r; n += 62.5)

            {

                g.DrawPie(pen, -(int)n/2+l, (int)(j + (r - n) / 2), (int)n, (int)n, -30, 60);

            }

             e.Graphics.DrawImage(bmp, new Point(0, 0));           

        }



        private void timer1_Tick(object sender, EventArgs e)

        {

            if (k <= 1500)

            {

                k += 50;

                l += 50;

                Refresh();

                g.Dispose();

                bmp.Dispose();

            }

            else

            { return; }

        }

    }

}