GDI绘图小例子

今日学习了一个利用GDI画图的小例子,算是为以后深入学习GDI做个小铺垫。

using System;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace GDI_
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

      
        private PointF PointF(int p, int p_2)
        {
            throw new NotImplementedException();
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            //获取桌面坐标
            this.Text = string.Format("x={0},Y={1}",e.X,e.Y);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            DrawImage drawImage = new DrawImage();
            drawImage.obj = rtb_Image.CreateGraphics();
            drawImage.Draw();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }
    }
    public class DrawImage
    { 

     //属性
        /// <summary>
        /// 该属性用于获取不同的Graphics对象（图像初始600*385）
        /// </summary>
        public Graphics obj
        {
            get;
            set;
        }
       //绘图方法
        public void Draw()
        {
            Font font =new Font("宋体",9);
            //确定绘图路径，这里只是做了测试
            GraphicsPath gpath = new GraphicsPath();
            //每月盈利数据
            double[] data = { 34.3, 65.7, 33.1, 87, 57.3, 56, 99, 56.3, 41.6, 48.1, 57.3, 35.8 };
            //存储每月盈利数据最高点的坐标
            PointF[] dotP = new System.Drawing.PointF[12];
            //固定原点坐标不再修改
            Point O = new Point(35, 350);
            //重新定义一支笔,带有前端箭头
            Pen pen = new Pen(Color.Red);
            pen.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
            //创建Graphics对象
            Graphics g = obj;
            //原点标识
            g.DrawString("O",font, Brushes.Black, O.X - 5, O.Y + 5);
            //绘制X轴
            g.DrawLine(pen, O.X, O.Y, O.X + 550, O.Y);
            //绘制Y轴
            g.DrawLine(pen, O.X, O.Y, O.X, O.Y - 325);
            // 绘制X轴刻度(X,Y+5), 月份
            for (int i = 0; i < 12; i++)
            {
                g.DrawLine(Pens.Red, O.X + (i + 1) * 42, O.Y, O.X + (i + 1) * 42, O.Y - 5);
                //确定月份坐标
                PointF monP = new System.Drawing.PointF(O.X + (i + 1) * 42 - 10, O.Y + 5);
                g.DrawString(string.Format("{0}月", i + 1), font, Brushes.Green, monP);
                //每月最高盈利点坐标确定
                PointF mofpP = new PointF(monP.X, O.Y - (float)data[i] * 3);
                dotP[i] = mofpP;
                // g.DrawEllipse(Pens.SeaGreen,new RectangleF(mofpP.X,mofpP.Y,2,2));
                gpath.AddEllipse(new RectangleF(mofpP.X, mofpP.Y, 2, 2));
            }
            gpath.AddLines(dotP);
            g.DrawPath(Pens.Purple, gpath);
            //   g.DrawLines(Pens.Plum, dotP);
            //绘制Y轴坐标(X,Y-5)，盈利 10W=30px==>1w=3px
            for (int i = 0; i < 10; i++)
            {
                g.DrawLine(Pens.Red, O.X, O.Y - (i + 1) * 30, O.X + 5, O.Y - (i + 1) * 30);
                //确定金额坐标
                PointF payP = new PointF(O.X - 35, O.Y - (i + 1) * 30 - 8);
                g.DrawString(string.Format("{0}万", (i + 1) * 10), font, Brushes.Green, payP);
            }
            pen.Dispose();//释放创建的pen对象
        }
    }
}

效果图：