1、Java版本简单的手绘程序，点击右键可以选择颜色，对初学Java的同学还是很有帮助！学会做这个，下一步就可以做出一个简单的Windows版本的画图！
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package
project;
import
java.awt.Canvas;
import
java.awt.Color;
import
java.awt.Dimension;
import
java.awt.Frame;
import
java.awt.Graphics;
import
java.awt.MenuItem;
import
java.awt.PopupMenu;
import
java.awt.event.ActionEvent;
import
java.awt.event.ActionListener;
import
java.awt.event.MouseAdapter;
import
java.awt.event.MouseEvent;
import
java.awt.event.MouseMotionAdapter;
import
java.awt.event.WindowAdapter;
import
java.awt.event.WindowEvent;
import
java.awt.image.BufferedImage;
/**
*
*@author huyongjian Oracle(Compus Solution Group)
* @Date 2013-8-18
* @version 2.0
* @since JDK1.6（建议）
Copy Right Information COMPUS SOLUTION GROUP
IDE:Eclipse
class:
绘制图像01
*/
public
class
HandDraw {
//画图去的宽度
private
final
int
AREA_WIDTH=
500
;
//画图去的高度
private
final
int
AREA_HEIGHT=
400
;
//下面的prex、prey保存了上一次鼠标拖动事件的鼠标坐标
private
int
preX=-
1
;
private
int
preY=-
1
;
//定义一个右键菜单用于设置画笔颜色
PopupMenu pop=
new
PopupMenu();
MenuItem redItem=
new
MenuItem(
"红色"
);
MenuItem greenItem=
new
MenuItem(
"绿色"
);
MenuItem blueItem=
new
MenuItem(
"蓝色"
);
MenuItem blackItem=
new
MenuItem(
"黑色"
);
//定义一个BufferedImage对象
BufferedImage image=
new
BufferedImage(AREA_WIDTH,AREA_HEIGHT,
BufferedImage.TYPE_INT_RGB
);
//获取image对象的Graphics
Graphics g=image.getGraphics();
private
Frame f=
new
Frame(
"简单手绘程序"
);
private
DrawCanvas drawArea=
new
DrawCanvas();
//用于保存需要绘制什么图形的字符串属性
private
String shape=
""
;
//用于保存画笔颜色
private
Color foreColor=
new
Color(
255
,
0
,
0
);
public
void
init(){
ActionListener menuListener=
new
ActionListener(){
public
void
actionPerformed(ActionEvent e){
if
(e.getActionCommand().equals(
"绿色"
)){
foreColor=
new
Color(
0
,
255
,
0
);
}
if
(e.getActionCommand().equals(
"红色"
)){
foreColor=
new
Color(
255
,
0
,
0
);
}
if
(e.getActionCommand().equals(
"蓝色"
)){
foreColor=
new
Color(
0
,
0
,
255
);
}
if
(e.getActionCommand().equals(
"黑色"
)){
foreColor=
new
Color(
0
,
0
,
0
);
}
}
};
//为三个菜单添加事件监听器
redItem.addActionListener(menuListener);
greenItem.addActionListener(menuListener);
blueItem.addActionListener(menuListener);
blackItem.addActionListener(menuListener);
//将菜单项组合成右键菜单
pop.add(redItem);
pop.add(greenItem);
pop.add(blueItem);
pop.add(blackItem);
//将右键菜单添加到drawArea对象中
drawArea.add(pop);
//将image对象的背景色填充成白色
g.fillRect(
0
,
0
, AREA_WIDTH, AREA_HEIGHT);
drawArea.setPreferredSize(
new
Dimension(AREA_WIDTH,AREA_HEIGHT));
//监听鼠标移动动作
drawArea.addMouseMotionListener(
new
MouseMotionAdapter(){
//实现按下鼠标键并拖动的事件处理器
public
void
mouseDragged(MouseEvent e) {
//如果preX和preY大于0
if
(preX>
0
&&preY>
0
){
//设置当前颜色
g.setColor(foreColor);
//绘制从上一次鼠标拖动事件点到本次鼠标拖动事件点的线段
g.drawLine(preX, preY, e.getX(), e.getY());
}
//将当前鼠标事件点的x、y坐标保存起来
preX=e.getX();
preY=e.getY();
//重绘drawArea对象
drawArea.repaint();
}
});
drawArea.addMouseListener(
new
MouseAdapter(){
public
void
mouseReleased(MouseEvent e) {
//弹出右键菜单
if
(e.isPopupTrigger()){
pop.show(drawArea, e.getX(), e.getY());
}
//松开鼠标键,把上一次鼠标拖动事件的 x y坐标设为-1；
preX=-
1
;
preY=-
1
;
}
});
f.add(drawArea);
f.pack();
f.setVisible(
true
);
f.addWindowListener(
new
WindowAdapter(){
public
void
windowClosing(WindowEvent e){
System.exit(
0
);
}
});
f.setLocationRelativeTo(
null
);
}
public
static
void
main(String[] args) {
new
HandDraw().init();
}
class
DrawCanvas
extends
Canvas{
public
void
paint(Graphics g) {
g.drawImage(image,
0
,
0
,
null
);
}
}
}
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本文转自 小夜的传说 51CTO博客，原文链接：http://blog.51cto.com/1936625305/1282131，如需转载请自行联系原作者
