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Java实现的简单画图板示例

转载 作者：qq735679552 更新时间：2022-09-28 22:32:09 27 4
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这篇CFSDN的博客文章Java实现的简单画图板示例由作者收集整理，如果你对这篇文章有兴趣，记得点赞哟.

本文实例讲述了java实现的简单画图板。分享给大家供大家参考，具体如下:

这个画图板是我好久之前做的，之后浙大的同学需要做课设然后就花了一点时间将它改了一下，变得简单些能够方便扩充功能，同时学习java基础 。

先截图一下吧，就可以知道有哪些功能了~ 。

Java实现的简单画图板示例

三个分区，上面选择图形，下面选择颜色，立体圆就是一个分形，也先放着不需要的同学可以注释了它 。

代码很简单，就是jpanel进行分区，得到画笔，同时使用画图的函数就可以做到了 。

贴代码应该很快就会了~ 。

主类 。

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package awtdemo;
import java.awt.borderlayout;
import java.awt.color;
import java.awt.dimension;
import java.awt.flowlayout;
import javax.swing.jbutton;
import javax.swing.jframe;
import javax.swing.jpanel;
@suppresswarnings ( "serial" )
public class drawmain extends jpanel {
     public static void main(string[] args) {
         // todo auto-generated method stub
         drawmain draw = new drawmain();
         draw.initui();
     }
     public void initui() {
         jframe jf = new jframe();
         jf.setsize( 1000 , 780 );
         jf.settitle( "简单画板" );
         jf.setdefaultcloseoperation( 3 );
         jf.setlocationrelativeto( null );
         jf.setlayout( new borderlayout());
         // 实例化事件监听类
         drawlistener dl = new drawlistener( this );
         // 实现中间面板
         this .setbackground(color.white);
         jf.add( this , borderlayout.center);
         // 实现性状面板
         jpanel shapepanel = new jpanel();
         shapepanel.setbackground(color.black);
         shapepanel.setlayout( new flowlayout(flowlayout.center));
         shapepanel.setbackground(color.gray);
         ;
         string[] shape = { "直线" , "曲线" , "圆" , "喷枪" , "橡皮擦" , "矩形" , "椭圆" , "圆角矩形" ,
                 "弧线" , "多边形" , "图形" , "三角形" , "立体圆" , };
         for ( int i = 0 ; i < shape.length; i++) {
             jbutton button = new jbutton(shape[i]);
             button.setbackground(color.white);
             button.addactionlistener(dl); // 添加事件监听机制
             shapepanel.add(button);
         }
         jf.add(shapepanel, borderlayout.north);
         // 实现颜色面板
         jpanel colorpanel = new jpanel();
         colorpanel.setbackground(color.black);
         colorpanel.setlayout( new flowlayout(flowlayout.center));
         colorpanel.setbackground(color.gray);
         ;
         color[] color = { color.black, color.blue, color.white, color.gray,
                 color.red, color.cyan, color.green, color.darkgray, color.pink };
         for ( int i = 0 ; i < color.length; i++) {
             jbutton button = new jbutton();
             button.addactionlistener(dl); // 添加事件监听机制
             button.setpreferredsize( new dimension( 30 , 30 ));
             button.setbackground(color[i]);
             colorpanel.add(button);
         }
         jf.add(colorpanel, borderlayout.south);
         jf.setvisible( true );
         this .addmouselistener(dl);
         this .addmousemotionlistener(dl);
     }
}

监听辅助类 。

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package awtdemo;
import java.awt.basicstroke;
import java.awt.color;
import java.awt.graphics2d;
import java.awt.renderinghints;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;
import java.awt.event.mouseadapter;
import java.awt.event.mouseevent;
import java.util.random;
import javax.swing.jbutton;
public class drawlistener extends mouseadapter implements actionlistener {
     private int x1, y1, x2, y2;
     private int newx1, newy1, newx2, newy2;
     private graphics2d g;
     private drawmain df;
     private boolean flag = false ;
     string shape = "直线" ;
     color color;
     private int [] arrx = new int [ 4 ];
     private int [] arry = new int [ 4 ];
     private int temp = 0 ;
     drawlistener(drawmain d) {
         df = d;
     }
     // 获取形状和颜色
     public void actionperformed(actionevent e) {
         if (e.getactioncommand().equals( "" )) {
             jbutton button = (jbutton) e.getsource();
             color = button.getbackground();
             system.out.println( "color = " + color);
         } else {
             jbutton button = (jbutton) e.getsource();
             shape = button.getactioncommand();
             system.out.println( "string = " + shape);
         }
     }
     // 实现画笔
     public void mousepressed(mouseevent e) {
         g = (graphics2d) df.getgraphics();
         g.setcolor(color);
         x1 = e.getx();
         y1 = e.gety();
     }
     public void mousereleased(mouseevent e) {
         x2 = e.getx();
         y2 = e.gety();
         if (shape.equals( "直线" )) {
             g.drawline(x1, y1, x2, y2);
         } else if (shape.equals( "弧线" )) {
             g.drawarc(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1), 0 , 180 );
         } else if (shape.equals( "多边形" ) && !flag) {
             g.drawline(x1, y1, x2, y2);
             newx1 = x1;
             newy1 = y1;
             newx2 = x2;
             newy2 = y2;
             flag = true ;
         } else if (shape.equals( "圆" )) {
             g.drawoval(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1));
         } else if (shape.equals( "矩形" )) {
             g.drawrect(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1));
         } else if (shape.equals( "圆角矩形" )) {
             g.drawroundrect(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1), 2 , 10 );
         } else if (shape.equals( "椭圆" )) {
             g.drawoval(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1));
         }
     }
     public void mouseclicked(mouseevent e) {
         if (shape.equals( "多边形" ) && flag) {
             x2 = e.getx();
             y2 = e.gety();
             if (e.getclickcount() == 2 ) {
                 g.drawline(newx1, newy1, newx2, newy2);
                 flag = false ;
             }
             g.drawline(newx2, newy2, x2, y2);
             newx2 = x2;
             newy2 = y2;
         } else if (shape.equals( "图形" )) {
             arrx[temp] = e.getx();
             arry[temp] = e.gety();
             temp++;
             if (temp == 4 ) {
                 int x = arrx[ 3 ];
                 int y = arry[ 3 ];
                 for ( int i = 0 ; i <= 10000 ; i++) {
                     random ran = new random();
                     int k = ran.nextint( 3 );
                     x = (x + arrx[k]) / 2 ;
                     y = (y + arry[k]) / 2 ;
                     g.drawline(x, y, x, y);
                 }
                 temp = 0 ;
             }
         } else if (shape.equals( "立体圆" )) {
             // double a=-2,b=-2,c=-1.2,d=2;
             double a = 1.40 , b = 1.56 , c = 1.40 , d = - 6.56 ;
             double x = 0 , xo = 0 ;
             double y = 0 , yo = 0 ;
             color[] col = { color.blue, color.cyan, color.green, color.magenta,
                     color.red, color.yellow };
             for ( int i = 0 ; i <= 90000 ; i++) {
                 random r = new random(); // 增加颜色
                 int r = r.nextint(col.length);
                 g.setcolor(col[r]);
                 // x=math.sin(a*yo)-math.cos(b*xo);
                 // y=math.sin(c*xo)-math.cos(d*yo);
                 x = d * math.sin(a * xo) - math.sin(b * yo);
                 y = c * math.cos(a * xo) + math.cos(b * yo);
                 int temp_x = ( int ) (x * 50 );
                 int temp_y = ( int ) (y * 50 );
                 g.drawline(temp_x + 500 , temp_y + 300 , temp_x + 500 ,
                         temp_y + 300 );
                 xo = x;
                 yo = y;
             }
         } else if (shape.equals( "三角形" )) {
             double a = - 2 , b = - 2 , c = - 1.2 , d = 2 ;
             double x = 0 , xo = 0 ;
             double y = 0 , yo = 0 ;
             color[] col = { color.blue, color.cyan, color.green, color.magenta,
                     color.red, color.yellow };
             for ( int i = 0 ; i <= 90000 ; i++) {
                 random r = new random(); // 增加颜色
                 int r = r.nextint(col.length);
                 g.setcolor(col[r]);
                 x = math.sin(a * yo) - math.cos(b * xo);
                 y = math.sin(c * xo) - math.cos(d * yo);
                 int temp_x = ( int ) (x * 50 );
                 int temp_y = ( int ) (y * 50 );
                 g.drawline(temp_x + 500 , temp_y + 300 , temp_x + 500 ,
                         temp_y + 300 );
                 xo = x;
                 yo = y;
             }
         }
     }
     public void mousedragged(mouseevent e) {
         x2 = e.getx();
         y2 = e.gety();
         if (shape.equals( "曲线" )) {
             // g.setstroke(new basicstroke(10));
             // g.setrenderinghint(renderinghints.key_antialiasing,
             // renderinghints.value_antialias_on);
             g.drawline(x1, y1, x2, y2);
             x1 = x2;
             y1 = y2;
         } else if (shape.equals( "橡皮擦" )) {
             g.setstroke( new basicstroke( 80 ));
             g.setrenderinghint(renderinghints.key_antialiasing,
                     renderinghints.value_antialias_on);
             g.setcolor(color.white);
             g.drawline(x1, y1, x2, y2);
             x1 = x2;
             y1 = y2;
         } else if (shape.equals( "喷枪" )) {
             // g.setstroke(new basicstroke(2)); //不用加粗
             // g.setrenderinghint(renderinghints.key_antialiasing,
             // renderinghints.value_antialias_on);
             for ( int k = 0 ; k < 20 ; k++) {
                 random i = new random();
                 int a = i.nextint( 8 );
                 int b = i.nextint( 10 );
                 g.drawline(x2 + a, y2 + b, x2 + a, y2 + b);
             }
         }
     }
}

代码量也还是挺小的，因为是简单画板嘛~~ 。

希望本文所述对大家java程序设计有所帮助.

原文链接：https://blog.csdn.net/SX_csu2016sw/article/details/76570307 。

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