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~
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