此程序是在网格线中拖放图像
这是实际代码：
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
public class DragAndDrop extends JFrame
{
WATCanvas canvas;
public DragAndDrop()
{
super();
Container container = getContentPane();
setBackground(Color.WHITE);
canvas = new WATCanvas(800,600,45,40);
container.add(canvas);
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(1, 2));
container.add(panel, BorderLayout.SOUTH);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
setSize(1200,1000);
setVisible(true);
}
class WATCanvas extends JPanel
{
Cursor curSP, curCSF, curCDF, curUB, curPP, curMod, curKD, cur;
int buttonLeftBorder = 900;
int buttonTopBorder = 20;
double spX=buttonLeftBorder, spY=buttonTopBorder+10, spW=20, spH=20;//singlePallet coordinates
double csFX=buttonLeftBorder, csFY=buttonTopBorder+90, csFW=80, csFH=40;//caseFlow coordinates
double cdFX=buttonLeftBorder, cdFY=buttonTopBorder+150, cdFW=40, cdFH=40;//caddyFlow coordinates
double ubX=buttonLeftBorder, ubY=buttonTopBorder+210, ubW=80, ubH=20;//unloadBulk coordinates
double ppX=buttonLeftBorder, ppY=buttonTopBorder+250, ppW=80, ppH=20;//prePick coordinates
double modX=buttonLeftBorder, modY=buttonTopBorder+290, modW=40, modH=40;//module coordinates
double kdX=buttonLeftBorder, kdY=buttonTopBorder+350, kdW=20, kdH=20;//kd coordinates
int x1, y1, x2, y2;
int width, height, rows, cols;
Rectangle2D singlePallet;
Rectangle2D caseFlow;
Rectangle2D caddyFlow;
Rectangle2D unloadBulk;
Rectangle2D prePick;
Rectangle2D module;
Rectangle2D kd;
Rectangle2D selectedShape;
Rectangle2D boundingRec;
public WATCanvas(int w, int h, int r, int c)
{
setBackground(Color.white);
setSize(width = w, height = h);
rows = r;
cols = c;
addMouseListener(new MyMouseListener());
addMouseMotionListener(new MyMouseMotionListener());
setTitle("Warehouse Allocation Model");
}
public void paint(Graphics g)
{
Font insideDrawing = new Font("TimesRoman",Font.PLAIN, 9);
Font boldDescription = new Font("TimesRoman", Font.BOLD, 10);
Graphics2D g2 = (Graphics2D) g;
//single pallet location
singlePallet = new Rectangle2D.Double(spX,spY,spW,spW);
g2.draw(singlePallet);
g2.setFont(insideDrawing);
g2.drawString("xxx", buttonLeftBorder+05, buttonTopBorder+15);
g2.setFont(boldDescription);
g2.drawString("Single Pallet Lane", buttonLeftBorder+25, buttonTopBorder+20);
//Multiple Pallets
g2.setFont(insideDrawing);
g2.drawString("xxx",buttonLeftBorder+05,buttonTopBorder+55);
g2.drawRect(buttonLeftBorder, buttonTopBorder+50, 20, 20);
g2.drawRect(buttonLeftBorder+20, buttonTopBorder+50, 20, 20);
g2.drawRect(buttonLeftBorder+40, buttonTopBorder+50, 20, 20);
g2.drawRect(buttonLeftBorder+60, buttonTopBorder+50, 20, 20);
g2.setFont(boldDescription);
g2.drawString("Flow Lane (4-deep example)", buttonLeftBorder+85, buttonTopBorder+60);
//Case Flow
caseFlow = new Rectangle2D.Double(csFX,csFY,csFW,csFH);
g2.setFont(insideDrawing);
g2.drawString("Case Flow", buttonLeftBorder+20, buttonTopBorder+115);
g2.draw(caseFlow);
g2.setFont(boldDescription);
g2.drawString("Standard Case Flow Rack", buttonLeftBorder+85, buttonTopBorder+115);
//Caddy Flow
caddyFlow = new Rectangle2D.Double(cdFX,cdFY,cdFW,cdFH);
g2.setFont(insideDrawing);
g2.drawString("Caddy",buttonLeftBorder+10, buttonTopBorder+170);
g2.drawString("Flow",buttonLeftBorder+12,buttonTopBorder+180);
g2.draw(caddyFlow);
g2.setFont(boldDescription);
g2.drawString("Standard Caddy Flow Rack", buttonLeftBorder+45, buttonTopBorder+175);
//Unload Bulk Door
unloadBulk = new Rectangle2D.Double(ubX,ubY,ubW,ubH);
g2.setFont(insideDrawing);
g2.setColor(Color.BLACK);
g2.fill(unloadBulk);
g2.setColor(Color.WHITE);
g2.drawString("Unload/Bulk Door", buttonLeftBorder+3, buttonTopBorder+223);
g2.setColor(Color.BLACK);
g2.setFont(boldDescription);
g2.drawString("Unload/Bulk Door", buttonLeftBorder+85, buttonTopBorder+223);
//Pre-Pick Trad
prePick = new Rectangle2D.Double(ppX,ppY,ppW,ppH);
g2.setFont(insideDrawing);
g2.fill(prePick);
g2.setColor(Color.WHITE);
g2.drawString("PP/Trad",buttonLeftBorder+20, buttonTopBorder+263);
g2.setFont(boldDescription);
g2.setColor(Color.BLACK);
g2.drawString("Pre-Pick Module", buttonLeftBorder+85, buttonTopBorder+263);
//Module with spotted pattern
module = new Rectangle2D.Double(modX,modY,modW,modH);
g2.setFont(insideDrawing);
BufferedImage bi = new BufferedImage(5,5,BufferedImage.TYPE_INT_RGB);
Graphics2D big = bi.createGraphics();
big.setColor(Color.WHITE);
big.fillRect(0, 0, 5, 5);
big.setColor(Color.LIGHT_GRAY);
big.fillOval(2, 2, 2, 2);
TexturePaint tp = new TexturePaint(bi, new Rectangle(5,5));
g2.setPaint(tp);
g2.fill(module);
g2.setFont(boldDescription);
g2.setColor(Color.BLACK);
g2.drawString("Module", buttonLeftBorder+04, buttonTopBorder+310);
g2.draw(module);
g2.setFont(boldDescription);
g2.drawString("Standard Caddy Flow Rack", buttonLeftBorder+45, buttonTopBorder+310);
//KD with spotted pattern
kd = new Rectangle2D.Double(kdX,kdY,kdW,kdH);
BufferedImage bi2 = new BufferedImage(5,5,BufferedImage.TYPE_INT_RGB);
Graphics2D big2 = bi2.createGraphics();
big2.setColor(Color.DARK_GRAY);
big2.fillRect(0, 0, 5, 5);
big2.setColor(Color.BLACK);
big2.fillOval(2, 2, 2, 2);
TexturePaint tp2 = new TexturePaint(bi2, new Rectangle(5,5));
g2.setPaint(tp2);
g2.fill(kd);
g2.setFont(boldDescription);
g2.setColor(Color.BLACK);
g2.drawString("KD", buttonLeftBorder+4, buttonTopBorder+365);
g2.draw(kd);
g.setFont(boldDescription);
g.drawString("KD Stands", buttonLeftBorder+25, buttonTopBorder+365);
width = 900;
height = 800;
int start = 25;
int rowHt = 20;
for(int j=0;j<=rows;++j)
g.drawLine(start, start + j*rowHt, height+start,start + j*rowHt);
int rowWid = 20;
for(int k=0;k<=cols;++k)
g.drawLine(start+k*rowWid, start, start + k*rowWid, width+start);
if (cur != null)
setCursor(cur);
}
class MyMouseListener extends MouseAdapter
{
public void mousePressed(MouseEvent e)
{
if (singlePallet.contains(e.getX(), e.getY()))
{
selectedShape = singlePallet;
if (boundingRec != null)
boundingRec = singlePallet.getBounds2D();
}
else if (caseFlow.contains(e.getX(), e.getY()))
{
selectedShape = caseFlow;
if (boundingRec != null)
boundingRec = caseFlow.getBounds2D();
}
else if (caddyFlow.contains(e.getX(), e.getY()))
{
selectedShape = caddyFlow;
if (boundingRec != null)
boundingRec = caddyFlow.getBounds2D();
}
else if (unloadBulk.contains(e.getX(), e.getY()))
{
selectedShape = unloadBulk;
if (boundingRec != null)
boundingRec = unloadBulk.getBounds2D();
}
else if (prePick.contains(e.getX(), e.getY()))
{
selectedShape = prePick;
if (boundingRec != null)
boundingRec = prePick.getBounds2D();
}
else if (module.contains(e.getX(), e.getY()))
{
selectedShape = module;
if (boundingRec != null)
boundingRec = module.getBounds2D();
}
else if (kd.contains(e.getX(), e.getY()))
{
selectedShape = kd;
if (boundingRec != null)
boundingRec = kd.getBounds2D();
}
else
{
boundingRec = null;
}
canvas.repaint();
x1 = e.getX();
y1 = e.getY();
}
public void mouseReleased(MouseEvent e)
{
if (singlePallet.contains(e.getX(), e.getY()))
{
boundingRec = singlePallet.getBounds2D();
selectedShape = singlePallet;
}
else if (caseFlow.contains(e.getX(), e.getY()))
{
boundingRec = caseFlow.getBounds2D();
selectedShape = caseFlow;
}
else if (caddyFlow.contains(e.getX(), e.getY()))
{
boundingRec = caddyFlow.getBounds2D();
selectedShape = caddyFlow;
}
else if (unloadBulk.contains(e.getX(), e.getY()))
{
boundingRec = unloadBulk.getBounds2D();
selectedShape = unloadBulk;
}
else if (prePick.contains(e.getX(), e.getY()))
{
boundingRec = prePick.getBounds2D();
selectedShape = prePick;
}
else if (module.contains(e.getX(), e.getY()))
{
boundingRec = module.getBounds2D();
selectedShape = module;
}
else if (kd.contains(e.getX(), e.getY()))
{
boundingRec = kd.getBounds2D();
selectedShape = kd;
}
//canvas.repaint();
}
public void mouseClicked(MouseEvent e)
{
if (singlePallet.contains(e.getX(), e.getY()))
{
selectedShape = singlePallet;
boundingRec = singlePallet.getBounds2D();
}
else if (caseFlow.contains(e.getX(), e.getY()))
{
selectedShape = caseFlow;
boundingRec = caseFlow.getBounds2D();
}
else if (caddyFlow.contains(e.getX(), e.getY()))
{
selectedShape = caddyFlow;
boundingRec = caddyFlow.getBounds2D();
}
else if (unloadBulk.contains(e.getX(), e.getY()))
{
selectedShape = unloadBulk;
boundingRec = unloadBulk.getBounds2D();
}
else if (prePick.contains(e.getX(), e.getY()))
{
selectedShape = prePick;
boundingRec = prePick.getBounds2D();
}
else if (module.contains(e.getX(), e.getY()))
{
selectedShape = module;
boundingRec = module.getBounds2D();
}
else if (kd.contains(e.getX(), e.getY()))
{
selectedShape = kd;
boundingRec = kd.getBounds2D();
}
else
{
if (boundingRec != null)
boundingRec = null;
}
canvas.repaint();
}
}
class MyMouseMotionListener extends MouseMotionAdapter
{
public void mouseDragged(MouseEvent e) {
if (singlePallet.contains(e.getX(), e.getY()))
{
boundingRec = null;
selectedShape = singlePallet;
x2 = e.getX();
y2 = e.getY();
spX = spX + x2 - x1;
spY = spY + y2 - y1;
x1 = x2;
y1 = y2;
}
else if (caseFlow.contains(e.getX(), e.getY()))
{
boundingRec = null;
selectedShape = caseFlow;
x2 = e.getX();
y2 = e.getY();
csFX = csFX + x2 - x1;
csFY = csFY + y2 - y1;
x1 = x2;
y1 = y2;
}
else if (caddyFlow.contains(e.getX(), e.getY()))
{
boundingRec = null;
selectedShape = caseFlow;
x2 = e.getX();
y2 = e.getY();
cdFX = cdFX + x2 - x1;
cdFY = cdFY + y2 - y1;
x1 = x2;
y1 = y2;
}
else if (unloadBulk.contains(e.getX(), e.getY()))
{
boundingRec = null;
selectedShape = caseFlow;
x2 = e.getX();
y2 = e.getY();
ubX = ubX + x2 - x1;
ubY = ubY + y2 - y1;
x1 = x2;
y1 = y2;
}
else if (prePick.contains(e.getX(), e.getY()))
{
boundingRec = null;
selectedShape = caseFlow;
x2 = e.getX();
y2 = e.getY();
ppX = ppX + x2 - x1;
ppY = ppY + y2 - y1;
x1 = x2;
y1 = y2;
}
else if (module.contains(e.getX(), e.getY()))
{
boundingRec = null;
selectedShape = caseFlow;
x2 = e.getX();
y2 = e.getY();
modX = modX + x2 - x1;
modY = modY + y2 - y1;
x1 = x2;
y1 = y2;
}
else if (kd.contains(e.getX(), e.getY()))
{
boundingRec = null;
selectedShape = caseFlow;
x2 = e.getX();
y2 = e.getY();
kdX = kdX + x2 - x1;
kdY = kdY + y2 - y1;
x1 = x2;
y1 = y2;
}
}
public void mouseMoved(MouseEvent e)
{
if(singlePallet != null && caseFlow != null && caddyFlow != null && unloadBulk != null
&& prePick != null && module != null && kd != null)
{
if (singlePallet.contains(e.getX(), e.getY()))
{
cur = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
}
else if (caseFlow.contains(e.getX(), e.getY()))
{
cur = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
}
else if (caddyFlow.contains(e.getX(), e.getY()))
{
cur = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
}
else if (unloadBulk.contains(e.getX(), e.getY()))
{
cur = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
}
else if (prePick.contains(e.getX(), e.getY()))
{
cur = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
}
else if (module.contains(e.getX(), e.getY()))
{
cur = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
}
else if (kd.contains(e.getX(), e.getY()))
{
cur = Cursor.getPredefinedCursor(Cursor.HAND_CURSOR);
}
else
{
cur = Cursor.getDefaultCursor();
}
}
canvas.repaint();
}
}
}
public static void main(String arg[])
{
new DragAndDrop();
}
}
答案 0 :(得分：0)
将canvas.repaint()添加到mouseDragged方法的末尾，以便可以绘制更改...
public void mouseDragged(MouseEvent e) {
//...
canvas.repaint();
}
建议您使用paintComponent代替paint。请记住，这些方法只是一个复杂的动作链。除非您完全了解自己在做什么，否则请务必致电super.paintXxx。通常，这将为绘制准备Graphics上下文，防止以前开始绘制的内容显示在提供的Graphics上下文中......
你在绘画方法方面也做了很多工作。考虑使用BufferedImages呈现更多静态元素（如网格），直到某些内容发生变化并且您必须更新它...