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在此处输入图像描述

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;       
                     canvas.repaint();
                }
                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;
                     canvas.repaint();

                }
                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;
                     canvas.repaint();

                }
                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;
                      canvas.repaint();
                }
                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;
                     canvas.repaint();

                }
                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;
                     canvas.repaint();

                }
                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;
                      canvas.repaint();
                }

      }

            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();
        }

}

问题是拖动的项目正在留下图像中的轨迹。我想要做的就是将项目拖到网格然后在网格线中获取它的坐标你能帮我阻止它在被拖动时留下它的轨迹吗

任何形式的帮助将不胜感激，谢谢。

4

2 回答 2

2

  1. 自定义绘画是通过重写paintComponent()NOT paint() 来完成的。

  2. 不要忘记super.paintComponent()在方法开始时调用以在重新绘制之前清除背景。

于 2013-11-13T04:32:34.957 回答
-1

你的问题就在这里...

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);

你没有调用super.paint(g)which 来准备Graphics绘画的上下文......这应该在你开始做你自己的绘画之前完成（大多数情况下）

你不应该使用paint，但应该使用paintComponent

我在这个（非常相似的）问题中强调了这一点

看看Performing Custom Painting了解更多细节

于 2013-11-13T04:33:06.100 回答