一个简单的问题~

Question

保存一个Rect的对象数组 存有每一个Rect的矢量数据 鼠标每单击一下就遍历该数组 判断是选中的哪个 然后取鼠标初始位置和终止位置 改变选中的那个Rect的位置 要改变大小的话就要更复杂一些 有多复杂取决于你准备怎么定义改变Rect大小的鼠标操作

Answer 1

比如fillRect在窗体上画出来多个~能用鼠标事件来对某一个进行拖拽和改变大小吗？如果能是怎么是实现的！把思路想清楚了。代码就能写出来。
1。
  先把距形画出来，
  （每一个距形都是一个对象）
2。
  每一个距形都能接受两个事件  拖拽和改变
  （根据鼠标移动的位置来监听事件）  

Answer 2

import javax.swing.*;
import java.awt.*;
import java.awt.event.*; 
public class draw extends JFrame {
private int startX, startY, endX, endY;
private Graphics og;
private Image oimg;
public draw(){
this.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseDragged(MouseEvent me) {
endX = me.getX();//鼠标拖动时的坐标
endY = me.getY();
repaint();//图形重绘
} 
});
this.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent me) {
startX = me.getX();//鼠标按下时的坐标
startY = me.getY();
}
public void mouseReleased(MouseEvent arg0) {
og.drawRect(startX, startY, endX-startX,endY-startY);//加一条直线至内存Graphics
} 
});
this.setTitle("lele天空java编程");
this.setBounds(0, 0, 400, 400);//确定窗体在屏幕上的大小
this.setResizable(true);//窗体大小框显示(true)
this.setVisible(true);//窗体显示(true)
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//关闭窗体
this.setLocation(0,0);//窗体在屏幕上的位置为(0,0)
oimg = createImage(800, 600);
og = oimg.getGraphics(); 
}
public void paint(Graphics g) {
super.paint(g);
g.drawImage(oimg, 0, 0, this);//先把之前保存在内存的Image画上
g.drawRect(startX, startY, endX-startX, endY-startY);//进行绘图 
}
public static void main(String[] args) {
new draw();
}
}

Answer 3

http://topic.csdn.net/u/20100107/22/89048adb-ef00-44f3-ad7f-59ee4c91dd7b.html?seed=1697807057&r=62557317#r_62557317

Answer 4

做了个，楼主可以试下，可以拖拽，可以改变大小。
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Stroke;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;import javax.swing.JFrame;
import javax.swing.JPanel;public class RectangleFrame{
public static void main(String[] args){
JFrame frame = new JFrame("Test Drag Rectangle");
Container c = frame.getContentPane();
c.setLayout(new BorderLayout());
JPanel rectPanel = new RectanglePanel();
c.add(rectPanel,BorderLayout.CENTER);
frame.setBounds(200,150,500,300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}

}

Answer 5

class RectanglePanel extends JPanel implements MouseListener,MouseMotionListener{
public static final Integer NEW_RECTANGLE = new Integer(0);
public static final Integer DRAG_RECTANGLE = new Integer(1);
public static final Integer RESIZE_RECTANGLE = new Integer(2);
private int pressedX;
private int pressedY;

private List<RectEntry> rectList = new ArrayList<RectEntry>();

private Integer operateType;
private RectEntry draggingRect;
private RectEntry newingRect;
private RectEntry resizingRect;
private int startX;
private int startY;
private Random colorRandom = new Random();
public RectanglePanel(){
this.addMouseListener(this);
this.addMouseMotionListener(this);
}
public void paintComponent(Graphics g){
Color bgColor = this.getBackground();
g.setColor(bgColor);
g.fillRect(0, 0, this.getWidth(), this.getHeight());
for(int i=rectList.size()-1;i>=0;i--){
RectEntry rectEntry = rectList.get(i);
Rectangle rect = rectEntry.getRect();
Color drawColor = rectEntry.getDrawColor();
g.setColor(drawColor);
g.drawRect(rect.x, rect.y, rect.width, rect.height);
Color fillColor = rectEntry.getFillColor();
g.setColor(fillColor);
g.fillRect(rect.x, rect.y, rect.width, rect.height);
}
if(draggingRect != null){
Graphics2D g2d = (Graphics2D)g;
Stroke oldStroke = g2d.getStroke();
g2d.setStroke(new BasicStroke(1.0f,BasicStroke.CAP_SQUARE,BasicStroke.JOIN_MITER,10.0f,new float[]{2,2},0));
Rectangle rect = draggingRect.getRect();
Color drawColor = draggingRect.getDrawColor();
g.setColor(drawColor);
g.drawRect(rect.x, rect.y, rect.width, rect.height);
g2d.setStroke(oldStroke);
}
if(newingRect != null){
Graphics2D g2d = (Graphics2D)g;
Stroke oldStroke = g2d.getStroke();
g2d.setStroke(new BasicStroke(1.0f,BasicStroke.CAP_SQUARE,BasicStroke.JOIN_MITER,10.0f,new float[]{2,2},0));
Rectangle rect = newingRect.getRect();
Color drawColor = newingRect.getDrawColor();
g.setColor(drawColor);
g.drawRect(rect.x, rect.y, rect.width, rect.height);
g2d.setStroke(oldStroke);
}
if(resizingRect != null){
Graphics2D g2d = (Graphics2D)g;
Stroke oldStroke = g2d.getStroke();
g2d.setStroke(new BasicStroke(1.0f,BasicStroke.CAP_SQUARE,BasicStroke.JOIN_MITER,10.0f,new float[]{2,2},0));
Rectangle rect = resizingRect.getRect();
Color drawColor = resizingRect.getDrawColor();
g.setColor(drawColor);
g.drawRect(rect.x, rect.y, rect.width, rect.height);
g2d.setStroke(oldStroke);
}
}

Answer 6

public void mouseDragged(MouseEvent e) {
if(operateType == DRAG_RECTANGLE){
int draggedX = e.getX();
int draggedY = e.getY();
int moveX = draggedX-pressedX;
int moveY = draggedY-pressedY;
Rectangle rect = draggingRect.getRect();
int w = rect.width;
int h = rect.height;
rect.setBounds(startX+moveX, startY+moveY, w, h);
this.repaint();
}else if(operateType == NEW_RECTANGLE){
int x = pressedX;
int y = pressedY;
int draggedX = e.getX();
int draggedY = e.getY();
Rectangle rect = newingRect.getRect();
Rectangle locationRect = new Rectangle();

if(draggedX-x>0){
locationRect.x = x;
locationRect.width = draggedX-x;
if(draggedY-y>0){
locationRect.y = y;
locationRect.height = draggedY-y;
}else{
locationRect.y = draggedY;
locationRect.height = y-draggedY;
}
}else{
locationRect.x = draggedX;
locationRect.width = x-draggedX;
if(draggedY-y>0){
locationRect.y = y;
locationRect.height = draggedY-y;
}else{
locationRect.y = draggedY;
locationRect.height = y-draggedY;
}
}
rect.setBounds(locationRect);
this.repaint();
}else if(operateType == RESIZE_RECTANGLE){
int x = startX;
int y = startY;
int draggedX = e.getX();
int draggedY = e.getY();
Rectangle rect = resizingRect.getRect();
Rectangle locationRect = new Rectangle();

if(draggedX-x>0){
locationRect.x = x;
locationRect.width = draggedX-x;
if(draggedY-y>0){
locationRect.y = y;
locationRect.height = draggedY-y;
}else{
locationRect.y = draggedY;
locationRect.height = y-draggedY;
}
}else{
locationRect.x = draggedX;
locationRect.width = x-draggedX;
if(draggedY-y>0){
locationRect.y = y;
locationRect.height = draggedY-y;
}else{
locationRect.y = draggedY;
locationRect.height = y-draggedY;
}
}
rect.setBounds(locationRect);
this.repaint();
}

} public void mouseMoved(MouseEvent e) {

} public void mouseClicked(MouseEvent e) {

} public void mouseEntered(MouseEvent e) {

} public void mouseExited(MouseEvent e) {

}

Answer 7

public void mousePressed(MouseEvent e) {
pressedX = e.getX();
pressedY = e.getY();
Object[] results = pointInRect(pressedX,pressedY);
operateType = (Integer)results[0];
if(operateType == DRAG_RECTANGLE){
RectEntry rectsAtPoint = (RectEntry)results[1];
draggingRect = rectsAtPoint;
newingRect = null;
resizingRect = null;
Rectangle rect = draggingRect.getRect();
startX = rect.x;
startY = rect.y;

rectList.remove(draggingRect);

}else if(operateType == NEW_RECTANGLE){
draggingRect = null;
resizingRect = null;
Color fillColor = new Color(colorRandom.nextInt(256),colorRandom.nextInt(256),colorRandom.nextInt(256));
Color drawColor = new Color(colorRandom.nextInt(256),colorRandom.nextInt(256),colorRandom.nextInt(256));
newingRect = new RectEntry(new Rectangle(pressedX,pressedY,0,0),fillColor,drawColor);

}else if(operateType == RESIZE_RECTANGLE){
RectEntry rectsAtPoint = (RectEntry)results[1];
resizingRect = rectsAtPoint;
draggingRect = null;
newingRect = null;
Rectangle rect = resizingRect.getRect();
startX = rect.x;
startY = rect.y;
rectList.remove(resizingRect);
this.setCursor(Cursor.getPredefinedCursor(Cursor.SE_RESIZE_CURSOR));
}
} public void mouseReleased(MouseEvent e) {
if(operateType == DRAG_RECTANGLE){
int releasedX = e.getX();
int releasedY = e.getY();
int moveX = releasedX-pressedX;
int moveY = releasedY-pressedY;
Rectangle rect = draggingRect.getRect();
int w = rect.width;
int h = rect.height;
rect.setBounds(startX+moveX, startY+moveY, w, h);
rectList.add(0, draggingRect);
this.repaint();
}else if(operateType == NEW_RECTANGLE){
int x = pressedX;
int y = pressedY;
Rectangle rect = newingRect.getRect();

int releasedX = e.getX();
int releasedY = e.getY();

Rectangle locationRect = new Rectangle();

if(releasedX-x>0){
locationRect.x = x;
locationRect.width = releasedX-x;
if(releasedY-y>0){
locationRect.y = y;
locationRect.height = releasedY-y;
}else{
locationRect.y = releasedY;
locationRect.height = y-releasedY;
}
}else{
locationRect.x = releasedX;
locationRect.width = x-releasedX;
if(releasedY-y>0){
locationRect.y = y;
locationRect.height = releasedY-y;
}else{
locationRect.y = releasedY;
locationRect.height = y-releasedY;
}
}
rect.setBounds(locationRect);
rectList.add(0, newingRect);
this.repaint();
}else if(operateType == RESIZE_RECTANGLE){
int x = startX;
int y = startY;
Rectangle rect = resizingRect.getRect();

int releasedX = e.getX();
int releasedY = e.getY();

Rectangle locationRect = new Rectangle();

if(releasedX-x>0){
locationRect.x = x;
locationRect.width = releasedX-x;
if(releasedY-y>0){
locationRect.y = y;
locationRect.height = releasedY-y;
}else{
locationRect.y = releasedY;
locationRect.height = y-releasedY;
}
}else{
locationRect.x = releasedX;
locationRect.width = x-releasedX;
if(releasedY-y>0){
locationRect.y = y;
locationRect.height = releasedY-y;
}else{
locationRect.y = releasedY;
locationRect.height = y-releasedY;
}
}
rect.setBounds(locationRect);
rectList.add(0, resizingRect);
this.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
this.repaint();
}
operateType = null;
draggingRect = null;
newingRect = null;
}

Answer 8

public Object[] pointInRect(int x,int y){
Integer type = NEW_RECTANGLE;
Object[] results = new Object[2];
RectEntry containePointRectEntry = null;
for(int i=0;i<rectList.size();i++){
RectEntry rectEntry = rectList.get(i);
Rectangle rect = rectEntry.getRect();
if(rect.contains(x, y)){
Rectangle temp = new Rectangle();
temp.x = rect.x;
temp.y = rect.y;
temp.width = rect.width-5;
temp.height = rect.height-5;
if(temp.contains(x, y)){
type = DRAG_RECTANGLE;
}else{
type = RESIZE_RECTANGLE;
}
containePointRectEntry = rectEntry;
break;
}
}
results[0] = type;
results[1] = containePointRectEntry;
return results;
}
}
class RectEntry{
private Rectangle rect;
private Color fillColor;
private Color drawColor;
public RectEntry(Rectangle rect,Color fillColor,Color drawColor){
this.rect = rect;
this.fillColor = fillColor;
this.drawColor = drawColor;
}
public Rectangle getRect() {
return rect;
}
public void setRect(Rectangle rect) {
this.rect = rect;
}
public Color getFillColor() {
return fillColor;
}
public void setFillColor(Color fillColor) {
this.fillColor = fillColor;
}
public Color getDrawColor() {
return drawColor;
}
public void setDrawColor(Color drawColor) {
this.drawColor = drawColor;
}


}

Answer 9

    private RectEntry draggingRect;
    private RectEntry newingRect;
    private RectEntry resizingRect;这个三个是什么？

Answer 10

你的代码我看了好几个地方没看明白(我是新的不能在新的新手~)，其实我想要一个像画板一样的程序~能在上面画圆，矩形，线，三角等等~都是可以拖拽改变大小的~我试着在你给的程序改了一下！没有该明白~比如我一开始花了个矩形，等我在画圆的时候一开始的矩形也变成了圆形！颜色也是同样的问题！我用的是JColorChooser给的颜色！huangwj20042008大哥要是有时间就帮忙改一下好么？要是真的没时间~给点提示也可以！总之现在这些谢谢~帖子我已经结了不知道你还能不能看见!!!