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使用for循环与actionListener对象的java绘图_Java_Swing_Graphics_Actionlistener_Bufferedimage - Fatal编程技术网

使用for循环与actionListener对象的java绘图

使用for循环与actionListener对象的java绘图,java,swing,graphics,actionlistener,bufferedimage,Java,Swing,Graphics,Actionlistener,Bufferedimage,我想知道为什么我不能通过使用for循环来使用相同的效果,而不是使用带有actionlistener对象的内部类来刷新图像上的点图。代码如下: import java.awt.image.BufferedImage; import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.Random; public class MyCanvas { JLabel view; Buf

我想知道为什么我不能通过使用for循环来使用相同的效果,而不是使用带有actionlistener对象的内部类来刷新图像上的点图。代码如下:

import java.awt.image.BufferedImage;
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

import java.util.Random;

public class MyCanvas
{
    JLabel view;
    BufferedImage surface;
    Random random = new Random();
    public void initMyCanvas()
    {
        surface = new BufferedImage(1000,1000,BufferedImage.TYPE_INT_RGB);
        view = new JLabel(new ImageIcon(surface));
        Graphics g = surface.getGraphics();
        g.setColor(Color.ORANGE);
        g.fillRect(0,0,1000,1000);
        ActionListener listener=new ActionListener(){
            public void actionPerformed(ActionEvent ae){
                int[] xLoc = new int[10]; 
                int[] yLoc = new int[10];
                System.out.println("drawing..");
                Graphics g = surface.getGraphics();
                g.setColor(Color.ORANGE);
                g.fillRect(0,0,1000,1000);

                Random rn=new Random();

                for (int ji=0;ji<10;ji++){
                    xLoc[ji]=rn.nextInt(500);
                    yLoc[ji]=rn.nextInt(500);
                }

                drawNodes(xLoc,yLoc,g);
                try {
                    Thread.sleep(1);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        };
        Timer timer = new Timer(1000, listener);
        timer.start();
    }
    public static void main(String[] args)
    {
        MyCanvas canvas = new MyCanvas();
        canvas.initMyCanvas();
        JFrame frame = new JFrame();
        int vertexes = 0;
        vertexes = 10;
        int canvasSize = vertexes * vertexes;
        frame.setSize(canvasSize, canvasSize);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(canvas.view);        
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public void drawNodes(int[] x, int[] y, Graphics g)
    {
            // Treat each location as a 10x10 block. If position 1,1 then go to (5,5) - If position 3,5 then go to (25, 45) eg: (x*10)-5, (y*10)-5
            g.setColor(Color.white);
            System.out.println(" In drawNodes");
            for (int i=0;i<x.length;i++){
                g.fillOval(x[i], y[i], 8, 8);
            }
            g.dispose();
            view.repaint();
    }
}
导入java.awt.image.buffereImage;
导入java.awt.*;
导入java.awt.event.*;
导入javax.swing.*;
导入java.util.Random;
公共类MyCanvas
{
JLabel视图;
缓冲图像表面;
随机=新随机();
public void initMyCanvas()
{
表面=新的BuffereImage(10001000,BuffereImage.TYPE_INT_RGB);
视图=新JLabel(新图像图标(曲面));
Graphics g=surface.getGraphics();
g、 setColor(颜色为橙色);
g、 fillRect(0,010001000);
ActionListener=新建ActionListener(){
已执行的公共无效行动(行动事件ae){
int[]xLoc=新的int[10];
int[]yLoc=新的int[10];
系统输出打印项次(“图纸”);
Graphics g=surface.getGraphics();
g、 setColor(颜色为橙色);
g、 fillRect(0,010001000);
Random rn=新的Random();

对于(int ji=0;ji方法2的问题是您在EDT中调用您的循环,因为它会阻塞并且无法绘制组件。请阅读

1) Swing
Timer
适用于按间隔绘制。使用Timer,您无需使用
Thread.sleep(1);

2) 你可以试着用它来重新粉刷。你可以找到很多这样的例子

3) 也可以在
paintComponent()
方法中使用自定义绘画,然后观察下一步和下一步

import java.awt.image.BufferedImage;
import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

import java.util.Random;

public class MyCanvas
{
    JLabel view;
    BufferedImage surface;
    Random random = new Random();
    public void initMyCanvas()
    {
        surface = new BufferedImage(1000,1000,BufferedImage.TYPE_INT_RGB);
        view = new JLabel(new ImageIcon(surface));
        Graphics g = surface.getGraphics();
        g.setColor(Color.ORANGE);
        g.fillRect(0,0,1000,1000);
        for (int i=0; i<5;i++){
            int[] xLoc = new int[10]; 
            int[] yLoc = new int[10];
            System.out.println("drawing..");

            g.setColor(Color.ORANGE);
            g.fillRect(0,0,1000,1000);

            Random rn=new Random();

            for (int ji=0;ji<10;ji++){
                xLoc[ji]=rn.nextInt(500);
                yLoc[ji]=rn.nextInt(500);
            }

            drawNodes(xLoc,yLoc,g);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    public static void main(String[] args)
    {
        MyCanvas canvas = new MyCanvas();
        canvas.initMyCanvas();
        JFrame frame = new JFrame();
        int vertexes = 0;
        vertexes = 10;
        int canvasSize = vertexes * vertexes;
        frame.setSize(canvasSize, canvasSize);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(canvas.view);        
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }

    public void drawNodes(int[] x, int[] y, Graphics g)
    {
            // Treat each location as a 10x10 block. If position 1,1 then go to (5,5) - If position 3,5 then go to (25, 45) eg: (x*10)-5, (y*10)-5
            g.setColor(Color.white);
            System.out.println(" In drawNodes");
            for (int i=0;i<x.length;i++){
                g.fillOval(x[i], y[i], 8, 8);
            }
            g.dispose();
            view.repaint();
    }
}