c#绘图，怎样制作网格线

Question

我使用GDI+制作绘图板，需要在绘图区添加网格线（辅助线），像在photoshop中一样，应该怎样实现？

Answer 1

for(int  i = 0;i<10;i++)
   for(int j = 0;j<10;j++)
      g.drawLine (两个点);这样就ok了。、、

Answer 2

试下如下代码，不知道是否是楼主想要的？
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
ControlPaint.DrawGrid(e.Graphics, this.ClientRectangle, new Size(8, 8), Color.White);
}

Answer 3

这是我之前写的一个小程序中绘制图形的代码。
绘制了一个坐标轴，网络线等。      #region 绘图方法        private void panRight_Paint(object sender, PaintEventArgs e)
        {
            //手工绘制坐标轴       
            if (backgroundBuffer == null)
            {
                Rectangle rect = e.ClipRectangle;
                BufferedGraphicsContext currentContext = BufferedGraphicsManager.Current;
                backgroundBuffer = currentContext.Allocate(e.Graphics, e.ClipRectangle);
                backgroundBuffer.Graphics.SmoothingMode = SmoothingMode.HighQuality;
                backgroundBuffer.Graphics.PixelOffsetMode = PixelOffsetMode.HighSpeed;                Graphics gBG = backgroundBuffer.Graphics;
                gBG.Clear(Color.White);
                drawAXIS(gBG);                //绘制坐标轴
                drawTEXTRefLine(gBG);         //绘制坐标轴文字
            }            if (backBuffer == null)
            {
                Rectangle rect = e.ClipRectangle;
                BufferedGraphicsContext currentContext = BufferedGraphicsManager.Current;
                backBuffer = currentContext.Allocate(e.Graphics, e.ClipRectangle);
                backBuffer.Graphics.SmoothingMode = SmoothingMode.HighQuality;
                backBuffer.Graphics.PixelOffsetMode = PixelOffsetMode.HighSpeed;
            }
            //用背景缓冲区渲染双缓冲
            backgroundBuffer.Render(backBuffer.Graphics);            Graphics g = backBuffer.Graphics;            drawSW(g);                  //绘制方波
            drawFrame(g);               //绘制拖放时的边框
            backBuffer.Render(e.Graphics);      //双缓冲防闪烁（暂时未达到效果）
            
            
                    }
                private void drawFrame(Graphics g)
        {
            if (DragMode != SW.CPos.Other)
            {
                Pen p = new Pen(Color.Gray, 1);
                p.DashPattern = new float[] { 1, 1 };                if (DragMode == SW.CPos.Top)
                {
                    //
                    g.DrawLine(p, new Point(0, this.HFramePos), new Point(panRight.Width, this.HFramePos));
                }
                else     //水平拖放
                {
                    g.DrawLine(p, new Point(this.VFramePos, 0), new Point(this.VFramePos, panRight.Height));                }
            }
        }
        private void drawAXIS(Graphics g)
        {
            Pen p = new Pen(Color.Black, 3);        //创建绘制画笔                        g.DrawLine(p, new Point(opX, opY), new Point(opX + dX * cX, opY));  //画出X轴            g.DrawLine(p, new Point(opX, opY), new Point(opX, opY - dY * cY));  //画出Y轴
        }        private void drawTEXTRefLine(Graphics g)
        {
            SolidBrush sbX = new SolidBrush(Color.Blue);
            SolidBrush sbY = new SolidBrush(Color.Green);            Pen pRefX = new Pen(Color.Blue);
            pRefX.DashPattern = new float[] { 2, 1 };            Pen pRefY = new Pen(Color.Green);
            pRefY.DashPattern = new float[] { 2, 1 };            for (int i = 0; i < cX; i++)
            {
                //输出坐标标注
                Point outputPos = new Point(opX + dX * i, opY + 5);
                g.DrawString(i.ToString(), new Font("Tahoma", 9), sbX, outputPos);                //绘制相应参考线
                if (i > 0)
                {
                    Point pS = new Point(opX + dX * i, opY);
                    Point pE = new Point(opX + dX * i, opY - dY * cY);                    g.DrawLine(pRefX, pS, pE);
                }
            }            for (int i = 0; i < cY; i++)
            {                Point outputPos = new Point(opX - 25, opY - dY * i);
                g.DrawString(i.ToString(), new Font("Tahoma", 9), sbY, outputPos);                if (i > 0)
                {
                    Point pS = new Point(opX, opY - dY * i);
                    Point pE = new Point(opX + dX * cX, opY - dY * i);                    g.DrawLine(pRefY, pS, pE);
                }
            }
        }        private void drawSW(Graphics g)
        {
            //绘制笔
            Pen p = new Pen(Color.Red, 2);
            //方波区域对角点坐标            
            Point LeftTop = new Point(swMain.Left, swMain.Top);
            Point LeftBottom = new Point(swMain.Left, swMain.Top + swMain.Height);            Point RightTop = new Point(swMain.Left + swMain.Width, swMain.Top);
            Point RightBottom = new Point(swMain.Left + swMain.Width, swMain.Top + swMain.Height);            //绘制左侧线
            g.DrawLine(p, LeftTop, LeftBottom);            //绘制右侧线
            g.DrawLine(p, RightTop, RightBottom);            //绘制顶部线
            g.DrawLine(p, LeftTop, RightTop);
        }
        #endregion