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
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~~
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