C# GDI+ 画坐标(x,y)

 private void button1_Click(object sender, EventArgs e)
        {
            Graphics g = this.CreateGraphics();
            g.Clear(Color.White);
            Pen curPen = new Pen(Brushes.Black, 1);
            //g.DrawLine(curPen, 10, 0, 10, 30); //划线 ; (10,30) 水平坐标形同 10,0,  10,30;  
            int[] y = { 10, 20, 30, 40, 50, 60 };
            int[] x = { 30, 30, 30, 30, 30, 30 };
            for (int i = 0; i < y.Length; i++)
            {
                t1(g, curPen, x[i], y[i]);
            }
        }

        public void t1(Graphics g, Pen curPen, int x, int y)
        {
            g.DrawLine(curPen, x, y - 1, x, y); //划线 ; (10,30) 水平坐标形同 10,0,  10,30;  y坐标不同
        }

　　不知道 画笔 的像素是多少,   设置的是 画线的长度为1; 画笔的宽度 为1 

private void button1_Click(object sender, EventArgs e)
        {
            Graphics g = this.CreateGraphics();
            g.Clear(Color.White);
            Pen curPen = new Pen(Brushes.Black, 1);
            //g.DrawLine(curPen, 10, 0, 10, 30); //划线 ; (10,30) 水平坐标形同 10,0,  10,30;  
            int[] x = { 10, 20, 30, 40, 50, 60 };
            int[] y= { 30, 30, 30, 30, 30, 30 };
            for (int i = 0; i < y.Length; i++)
            {
                t1(g, curPen, x[i], y[i]);
            }
 
            t2(g,10,Color.Red, "ABCE",10, 30);
        }

        //绘制点
        public void t1(Graphics g, Pen curPen, int x, int y)
        {
            g.DrawLine(curPen, x, y - 1, x, y); //划线 ; (10,30) 水平坐标形同 10,0,  10,30;  y坐标不同
        }
        //绘制字符串
        public void t2(Graphics g, int fontsize,Color c ,string str,int x, int y)
        {     //创建一个画刷，颜色是纯色
            //选择字体、字号、风格
            Font font = new Font("微软雅黑", fontsize);
            Brush brush = new SolidBrush(c);  //Color.FromArgb(0, 255, 255)
            g.DrawString(str, font, brush, x, y); //划线 ; (10,30) 水平坐标形同 10,0,  10,30;  y坐标不同
        }