「java画线slope」java画线段

今天给各位分享java画线slope的知识，其中也会对java画线段进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！

本文目录一览：

• 1、java简单的画线程序
• 2、java如何画直线?
• 3、java中画直线的问题！！！
• 4、java怎么画出一条直线呢？高手进吧。

java简单的画线程序

import java.awt.*;

import java.awt.event.*;

import java.util.ArrayList;public class DrawLine extends Frame

implements WindowListener

{

static ArrayList lbArray; DrawLine(){

setBounds(150,150,300,300);

setVisible(true);

Label lb0=new Label("Hello");

addWindowListener(this);

add(lb0);

lb0.setBounds(50,30,40,20);

Label lb1=new Label("World!");

add(lb1);

lb1.setBounds(50,90,40,20); Label lb2=new Label("Java");

add(lb2);

lb2.setBounds(50,150,40,20);

lbArray.add(lb0);

lbArray.add(lb1);

lbArray.add(lb2);

repaint(); }

public void windowClosed(WindowEvent w)

{

System.exit(0);

}

public void windowClosing(WindowEvent w)

{

dispose();

}

public void windowOpened(WindowEvent e) {}

public void windowIconified(WindowEvent e) {}

public void windowDeiconified(WindowEvent e) {}

public void windowActivated(WindowEvent e) {}

public void windowDeactivated(WindowEvent e) {}

public void paint(Graphics g)

{

super.paint(g); if(lbArray.size()=1)

{

g.setColor(Color.red);

int x1,y1,x2,y2;

Label lb=(Label)lbArray.get(0);

Rectangle rc=lb.getBounds();

x1=rc.x+rc.width/2;

y1=rc.y+rc.height/2;

for(int i=1;ilbArray.size();i++)

{

lb=(Label)lbArray.get(i);

rc=lb.getBounds();

x2=rc.x+rc.width/2;

y2=rc.y+rc.height/2;

g.drawLine(x1,y1,x2,y2);

x1=x2;

y1=y2;

}

}

} public static void main(String[] args){

lbArray=new ArrayList(10);

new DrawLine();

}

} 终于做了个满足你要求的东西。要知道我昨天和你说过我并不常用Java。赶快采纳吧。

java如何画直线?

这个简单

可以调用方法drawline(int x1, int y1, int x2, int y2)

其中(x1, y1), (x2, y2)分别为直线起点和终点的坐标

特意给你写了个小例子，希望能帮到你

***************************************

import javax.swing.*;

import java.awt.*;

public class DrawLine extends JPanel {

public static void main(String[] args) {

JFrame frame = new JFrame("DrawLine");

frame.getContentPane().add(new DrawLine());

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(300, 200);

frame.setVisible(true);

}

protected void paintComponent(Graphics g) {

super.paintComponent(g);

g.drawLine(50, 50, 200, 250);

}

}

****************************

将程序复制到记事本中并改名为DrawLine.java(注意大小写)

然后在命令行中用 CD＋文件夹 使命令范围到DrawLine.java的文件夹中

然后执行命令javac DrawLine.java

再执行命令java DrawLine

你会看到结果

java中画直线的问题！！！

import javax.swing.*;

import java.awt.*;

public class ex1_shapes extends JFrame{

/**

* @param args

*/

public ex1_shapes(){

super("实验一:直线、圆弧、多边形");

setSize(500,500);

show();

}

public void paint(Graphics g){

super.paint(g);

//直线演示

g.setColor(Color.BLUE);

g.drawLine(10, 10, 80, 150);

g.drawString("直线演示",50,50);

// 圆弧演示 显示“CS”

g.setColor(Color.green);

g.drawArc(180, 50, 50, 90, 30, 300); //c

g.drawArc(250, 50, 50, 45, 30,250); g.drawArc(250, 95, 50, 45, 90, -270); //S

g.drawString("圆弧演示",330,50);

//多边形 五角星

g.setColor(Color.RED);

int[] xpoints1={100,120,200,136,160,100,40,64,0,80};

int[] ypoints1={210,270,270,326,410,357,410,326,270,270};

g.drawPolygon(xpoints1, ypoints1, 10);

g.drawString("折线段演示",80,440);

//填充五角星

int[] xpoints2={350,370,450,386,410,350,290,314,250,330};

int[] ypoints2={210,270,270,326,410,357,410,326,270,270};

g.fillPolygon(xpoints2, ypoints2, 10);

g.drawString("填充图演示",330,440);

}

public static void main(String[] args) {

ex1_shapes demo=new ex1_shapes();

demo.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

// TODO 自动生成方法存根

}

}

刚做过的实验 上面代码可以运行

第一部分就是画直线的 顺便圆弧的也贴出来了 有注释 把BLUE改成GREEN就可以了

就是用Graphics类的draoLine（）方法

g.drawLine(10, 10, 80, 150); 也可以用Graphics2D的方法~

java怎么画出一条直线呢？高手进吧。

我晕，组件要重绘，就使用paintComponent方法吧，没有什么灵活不灵活的

import java.awt.Color;

import java.awt.EventQueue;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.GridLayout;

import javax.swing.BorderFactory;

import javax.swing.JComponent;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

public class FrameDemo extends JFrame {

private JPanel contentPane;

TestComponent tc1, tc2;

/**

* Launch the application.

*/

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

FrameDemo frame = new FrameDemo();

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

public FrameDemo() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 450, 300);

contentPane = new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

setContentPane(contentPane);

contentPane.setLayout(new GridLayout(2, 1, 10, 10));

tc1 = new TestComponent();

tc1.setBorder(BorderFactory.createLineBorder(Color.BLUE));

tc2 = new TestComponent();

tc2.setBorder(BorderFactory.createLineBorder(Color.PINK));

contentPane.add(tc1);

contentPane.add(tc2);

}

}

class TestComponent extends JComponent {

public void paintComponent(Graphics g1) {

Graphics2D g = (Graphics2D) g1;

g.setColor(Color.RED);

g.drawLine(0, 0, this.getWidth(), this.getHeight());

}

}

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