要实现的效果：鼠标点击winform上任意两点构成直线，点击第一个按钮，出现一个圆沿直线做往返运动，点击第二个按钮，同时出现三条直线，每条直线上有三个圆沿直线做往返运动。这个效果已实现，三个圆之间无闪屏
问题：解决三个圆之间的闪屏
界面：两个button，三个timer
代码：
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;namespace PictureSport{ public partial class Test_DongYuan : Form { public Test_DongYuan() { //this.DoubleBuffered = true;
InitializeComponent(); }
public Graphics g;//封装一个gdi+绘图图面 private Bitmap bmp; public Point p1;//默认第一条线点的起始坐标 public Point p2;//默认第一条线点的结束坐标
public Point p3; public Point p4; public Point p5; public Point p6;
private int n = 0; //运动点离起点的距离 private bool bDirect = true;//true为从起点向终点运行，false从终点向起点运行 Point pt = new Point(0, 0); //当前点
public int i = 1;//记录循环次数
public int m;//总距离
private void Test_DongYuan_Load(object sender, EventArgs e) {
//1、在内存中建立一块“虚拟画布” bmp = new Bitmap(this.Width, this.Height);//创建和窗体大小的画布 //2、获取这块内存画布的Graphics引用 g = Graphics.FromImage(bmp); ;//获取画布 timer1.Enabled = false;//一开始不画圆 timer2.Enabled = false; timer3.Enabled = false; }
private void Test_DongYuan_MouseClick(object sender, MouseEventArgs e) { if (i == 1) { p1 = new Point(); p1.X = e.Location.X; p1.Y = e.Location.Y; i++;
} else {
if (i == 2) { p2 = new Point(); p2.X = e.Location.X; p2.Y = e.Location.Y;
g.DrawLine(Pens.Black, p1, p2); g.DrawImage(bmp, new Point(0, 0)); this.BackgroundImage = bmp;//位图是虚拟的，所以直线只存在在位图上，只在位图上显示，要想真实显示出来就得以位图填充背景 g.Dispose();
}
}
}
private void timer1_Tick(object sender, EventArgs e) {
button1_Click(sender, e);
} private void timer2_Tick(object sender, EventArgs e) { //第一条直线上的直线
p3.X = p1.X; p3.Y = p1.Y - 50; p4.X = p2.X; p4.Y = p2.Y - 50;
//第一条直线下的直线 p5.X = p1.X; p5.Y = p1.Y + 50; p6.X = p2.X; p6.Y = p2.Y + 50;
bmp = new Bitmap(this.Width, this.Height);//创建和窗体大小的画布 g = Graphics.FromImage(bmp); ;//获取画布 g.DrawLine(Pens.Black, p1, p2); g.DrawLine(Pens.Black, p3, p4); g.DrawLine(Pens.Black, p5, p6); DongYuan(p3, p4); g.DrawImage(bmp, new Point(0, 0));
this.BackgroundImage = bmp;//位图是虚拟的，所以直线只存在在位图上，只在位图上显示，要想真实显示出来就得以位图填充背景 g.Dispose();
}
private void timer3_Tick(object sender, EventArgs e) {
//第一条直线上的直线
p3.X = p1.X; p3.Y = p1.Y - 50; p4.X = p2.X; p4.Y = p2.Y - 50;
//第一条直线下的直线 p5.X = p1.X; p5.Y = p1.Y + 50; p6.X = p2.X; p6.Y = p2.Y + 50;
bmp = new Bitmap(this.Width, this.Height);//创建和窗体大小的画布 g = Graphics.FromImage(bmp); ;//获取画布 g.DrawLine(Pens.Black, p1, p2); g.DrawLine(Pens.Black, p3, p4); g.DrawLine(Pens.Black, p5, p6); DongYuan(p5, p6); g.DrawImage(bmp, new Point(0, 0)); this.BackgroundImage = bmp;//位图是虚拟的，所以直线只存在在位图上，只在位图上显示，要想真实显示出来就得以位图填充背景 g.Dispose();
}
/// <summary> /// 动圆 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void button1_Click(object sender, EventArgs e) { DongYuan(p1,p2); timer1.Enabled = true;
} /// <summary> /// 动圆方法 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> public void DongYuan(Point p_first,Point p_last) {
//Math.Pow() Pow返回指定数字的指定次幂 pow(X,y)就是计算X的Y次方 m = (int)Math.Pow(Math.Pow((p_last.X - p_first.X), 2) + Math.Pow((p_last.Y - p_first.Y), 2), 0.5);//总距离 if (n == m)//运动点离起点的距离=总距离 bDirect = false;//false从终点向起点运行 if (n == 0)//运动点离起点的距离=0 bDirect = true;//true为从起点向终点运行 if (bDirect)//从起点向终点运行 n++;//运动点离起点的距离不断自加 else n--;//运动点离起点的距离不断自-
//Pen p11 = new Pen(Color.Black); Pen p_double = new Pen(Color.Red); Graphics g = this.CreateGraphics();
if (pt.X != 0 && pt.Y != 0) //清除上次的运动点 { //减去圆半径 g.DrawEllipse(new Pen(this.BackColor), pt.X - 15, pt.Y - 15, 30, 30); //清除上次的运动点 }
g.DrawLine(Pens.Black,p_first, p_last);//画起点到终点的线 g.DrawImage(bmp, new Point(0, 0)); this.BackgroundImage = bmp;//位图是虚拟的，所以直线只存在在位图上，只在位图上显示，要想真实显示出来就得以位图填充背景 //总距离不为0 if (m != 0) { pt.X = ((p_last.X - p_first.X) * n) / m + p_first.X; pt.Y = ((p_last.Y - p_first.Y)) * n / m + p_first.Y; g.DrawEllipse(p_double, pt.X - 15, pt.Y - 15, 30, 30); //画运动的点 g.Dispose();//释放资源
} }
/// <summary> /// 分批 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void button2_Click(object sender, EventArgs e) { timer2.Enabled = true; timer3.Enabled = true; //第一条直线上的直线 p3.X = p1.X; p3.Y = p1.Y - 50; p4.X = p2.X; p4.Y = p2.Y - 50;
//第一条直线下的直线 p5.X = p1.X; p5.Y = p1.Y + 50; p6.X = p2.X; p6.Y = p2.Y + 50;
bmp = new Bitmap(this.Width, this.Height);//创建和窗体大小的画布 g = Graphics.FromImage(bmp); ;//获取画布 g.DrawLine(Pens.Black,p1,p2); g.DrawLine(Pens.Black, p3, p4); g.DrawLine(Pens.Black, p5, p6); g.DrawImage(bmp, new Point(0, 0)); this.BackgroundImage = bmp;//位图是虚拟的，所以直线只存在在位图上，只在位图上显示，要想真实显示出来就得以位图填充背景 button1_Click(sender, e);
}
}}
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