cs p.Color button6.BackColor if b4stop.X - b4start.X 0 b4stop.Y - b4start.Y 0MessageBox.Show 小 朋 友 , 注 意 点 的 顺 序 ! Error MessageBoxButtons.OKMessageBoxIcon.Error g.DrawEllipsep b4start.X b4start.Y b4stop.X - b4start.X b4stop.Y -b4start.Y //画圆的代码 if button10.BackColor Color.MistyRose if this.mdb10 1 b10start.X e.X b10start.Y e.Y mdb10 else if this.mdb10 2 b10stop.X e.X b10stop.Y e.Y mdb10-- p.Color button6.BackColor Graphics g pictureBox1.CreateGraphics int d intMath.Sqrtb10start.X - b10stop.X b10start.X - b10stop.X b10start.Y - b10stop.Y b10start.Y - b10stop.Y Rectangle rect new Rectangleb10start.X-d b10start.Y-d 2d 2d g.DrawEllipsep rect 美容养颜吧:http://www.mryyb.com private void button7_Clickobject sender EventArgs e p.Width 2 private void button8_Clickobject sender EventArgs e p.Width 5 private void button9_Clickobject sender EventArgs e p.Width 10 private void 保存 ToolStripMenuItem_Clickobject sender EventArgs e SaveFileDialog sa new SaveFileDialog sa.Filter 保存.bmp.bmp sa.FilterIndex 2 sa.RestoreDirectory true if DialogResult.OK sa.ShowDialog if pictureBox1.Image null Image im this.pictureBox1.Image Bitmap bit new Bitmapim bit.Savesa.FileName System.Drawing.Imaging.ImageFormat.Bmp else MessageBox.Show已保存 private void 旋转 ToolStripMenuItem_Clickobject sender EventArgs eprivate void 度 ToolStripMenuItem_Clickobject sender EventArgs eprivate void 度 ToolStripMenuItem1_Clickobject sender EventArgs eprivate void 新建 ToolStripMenuItem_Clickobject sender EventArgs eprivate void pictureBox1_Clickobject sender EventArgs eprivate void 关于 ToolStripMenuItem_Clickobject sender EventArgs eprivate void Form1_Loadobject sender EventArgs e private void groupBox1_Enterobject sender EventArgs e private void 缩放 ToolStripMenuItem_Clickobject sender EventArgs e private void 放大 ToolStripMenuItem_Clickobject sender EventArgs e private void maskedTextBox1_MaskInputRejectedobject senderMaskInputRejectedEventArgs e MessageBox.Show先选择矩形左上角的点,再选择矩形的右下角的点 private void button11_Clickobject sender EventArgs e
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