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java绘图代码 java绘图函数
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在Java中如何用程序画一个圆
使用java画圆要用到绘图类Graphics，下面是实例代码和运行效果java绘图代码：
package com.dikea.demo01;
import java.awt.*;
import javax.swing.*;
// java绘图原理
public class demo_01 extends JFrame {
MyPanel mp = null;
public static void main(String[] args) {
// TODO 自动生成java绘图代码的方法存根
demo_01 demo01 = new demo_01();
}
public demo_01(){
mp = new MyPanel();
this.add(mp);
this.setSize(400, 300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
}
}
// 定义一个MyPanel面板，用于绘图区域
class MyPanel extends JPanel{
//覆盖JPanel
// Graphics 是绘图的重要类，可以理解成一支画笔
public void paint(Graphics g){
// 1. 调用父类函数完成初始化任务
// 这句话不可以少
super.paint(g);
// 先画出一个圆圈
g.drawOval(100, 100, 30, 30);
}
}
代码复制进ide编程工具，运行效果如下：
java绘图代码问题
我随手写了一个，你自己看看，注释我就不写了
import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class TestDraw implements ActionListener {
private JButton b1,b2,b3;
JFrame frame;
MyPanel panel;
public void init() {
frame = new JFrame();
frame.setBounds(100, 100, 400, 300);
frame.setTitle("画");
frame.setLayout(new GridLayout(2, 1));
JPanel p1 = new JPanel();
b1 = new JButton("直线");
b2 = new JButton("矩形");
b3 = new JButton("椭圆");
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
p1.add(b1);
p1.add(b2);
p1.add(b3);
panel = new MyPanel();
frame.add(p1);
frame.add(panel);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == b1) {
panel.setFlag(0);
panel.repaint();
}else if(e.getSource() == b2) {
panel.setFlag(1);
panel.repaint();
}else if(e.getSource() == b3) {
panel.setFlag(2);
panel.repaint();
}
}
public static void main(String[] args) {
new TestDraw().init();
}
class MyPanel extends JPanel {
int flag = -1;
public MyPanel() {
this.setSize(400, 400);
this.setBackground(Color.white);
this.setVisible(true);
}
//画直线
public void drawL(Graphics g) {
g.drawLine(100, 20, 200, 20);
}
//画矩形
public void drawR(Graphics g) {
g.drawRect(100, 20, 200, 100);
}
//画椭圆
public void drawO(Graphics g) {
g.drawOval(100, 20, 200, 100);
}
@Override
public void paint(Graphics g) {
super.paint(g);
if(flag == 0) {
drawL(g);
}else if(flag == 1) {
drawR(g);
}else if(flag == 2) {
drawO(g);
}
}
public int getFlag() {
return flag;
}
public void setFlag(int flag) {
this.flag = flag;
}
}
}
怎么用java代码模拟一张图片
用java代码模拟一张图片可以这样操作：1.创建BufferedImage类
2.根据BufferedImage类得到一个Graphics2D对象
3.根据Graphics2D对象进行逻辑操作
4.处理绘图
5.将绘制好的图片写入到图片
java绘图问题 需要代码
package zhidao;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GraphMove extends JFrame{
private static final long serialVersionUID = 4375881805428526361L;
private Graphics graph = null;
public GraphMove() {
JPanel jp = new JPanel();
jp.setPreferredSize(new Dimension(800, 400));
this.add(jp);
this.pack();
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
this.setVisible(true);
this.graph = jp.getGraphics();
}
public void paint(Graphics graph){}
public void test() {
Dot point = new Dot(400, 100);
LineSegment seg = new LineSegment(new Dot(100, 50), new Dot(150, 90));
Triangle tri = new Triangle(new Dot(600, 250), new LineSegment(new Dot(500, 150), new Dot(500, 200)));
point.display(graph, Color.BLACK);
seg.display(graph, Color.BLACK);
tri.display(graph, Color.BLACK);
//Move dot
double alpha = 3 * Math.PI / 4;
int d = 80;
point.move(alpha, d);
point.display(graph, Color.RED);
//Move line segment
alpha = Math.PI / 4;
d = 200;
seg.move(alpha, d);
seg.display(graph, Color.RED);
//Move triangle
alpha = 1.0;
d = 100;
tri.move(alpha, d);
tri.display(graph, Color.RED);
}
public static void main(String[] args) {
new GraphMove().test();
}
}
class Dot {
int x, y;
public Dot(int x, int y) {
this.x = x;
this.y = y;
}
public void move(double alpha, int d) {
x += (int) (d * Math.cos(alpha));
y += (int) (d * Math.sin(alpha));
}
public void display(Graphics graph, Color color) {
graph.setColor(color);
graph.drawOval(x, y, 1, 1);
}
}
class LineSegment {
Dot start, end;
public LineSegment(Dot start, Dot end) {
this.start = start;
this.end = end;
}
public void move(double alpha, int d) {
start.move(alpha, d);
end.move(alpha, d);
}
public void display(Graphics graph, Color color) {
graph.setColor(color);
graph.drawLine(start.x, start.y, end.x, end.y);
}
}
class Triangle {
Dot point;
LineSegment seg;
public Triangle(Dot point, LineSegment seg) {
this.point = point;
this.seg = seg;
}
public void move(double alpha, int d) {
point.move(alpha, d);
seg.move(alpha, d);
}
public void display(Graphics graph, Color color) {
graph.setColor(color);
seg.display(graph, color);
graph.drawLine(point.x, point.y, seg.start.x, seg.start.y);
graph.drawLine(point.x, point.y, seg.end.x, seg.end.y);
}
}
求java版画图程序的源代码
找到了，很久以前写的一个简单画图，呵呵～当时要求用AWT写，很难受。
package net.miqiang.gui;
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
/**
* 简单画图板程序
* 好久没用 AWT 了，写起来真别扭，如果用 swing 会很舒服，有空再改写吧。
*
* @author 米强
*
*/
public class TestMain extends Frame {
// 画板
private Palette palette = null;
// 显示当前颜色的面板
private Panel nonceColor = null;
// 画笔粗细
private Label drawWidth = null;
// 画笔端点的装饰
private Label drawCap = null;
// 选取颜色按钮的监听事件类
private ButtonColorAction buttonColorAction = null;
// 鼠标进入按钮后光标样式的监听事件类
private ButtonCursor buttonCursor = null;
// 画笔样式的监听事件
private ButtonStrokeAction buttonStrokeAction = null;
/**
* 构造方法
*
*/
public TestMain() {
// 设置标题栏文字
super("简易画图板");
// 构造一个画图板
palette = new Palette();
Panel pane = new Panel(new GridLayout(2, 1));
// 画笔颜色选择器
Panel paneColor = new Panel(new GridLayout(1, 13));
// 12 个颜色选择按钮
Button [] buttonColor = new Button[12];
Color [] color = {Color.black, Color.blue, Color.cyan, Color.darkGray, Color.gray, Color.green, Color.magenta, Color.orange, Color.pink, Color.red, Color.white, Color.yellow};
// 显示当前颜色的面板
nonceColor = new Panel();
nonceColor.setBackground(Color.black);
paneColor.add(nonceColor);
buttonColorAction = new ButtonColorAction();
buttonCursor = new ButtonCursor();
for(int i = 0; i buttonColor.length; i++){
buttonColor[i] = new Button();
buttonColor[i].setBackground(color[i]);
buttonColor[i].addActionListener(buttonColorAction);
buttonColor[i].addMouseListener(buttonCursor);
paneColor.add(buttonColor[i]);
}
pane.add(paneColor);
// 画笔颜色选择器
Panel paneStroke = new Panel(new GridLayout(1, 13));
// 控制画笔样式
buttonStrokeAction = new ButtonStrokeAction();
Button [] buttonStroke = new Button[11];
buttonStroke[0] = new Button("1");
buttonStroke[1] = new Button("3");
buttonStroke[2] = new Button("5");
buttonStroke[3] = new Button("7");
buttonStroke[4] = new Button("9");
buttonStroke[5] = new Button("11");
buttonStroke[6] = new Button("13");
buttonStroke[7] = new Button("15");
buttonStroke[8] = new Button("17");
buttonStroke[9] = new Button("■");
buttonStroke[10] = new Button("●");
drawWidth = new Label("3", Label.CENTER);
drawCap = new Label("●", Label.CENTER);
drawWidth.setBackground(Color.lightGray);
drawCap.setBackground(Color.lightGray);
paneStroke.add(drawWidth);
for(int i = 0; i buttonStroke.length; i++){
paneStroke.add(buttonStroke[i]);
buttonStroke[i].addMouseListener(buttonCursor);
buttonStroke[i].addActionListener(buttonStrokeAction);
if(i = 8){
buttonStroke[i].setName("width");
}else{
buttonStroke[i].setName("cap");
}
if(i == 8){
paneStroke.add(drawCap);
}
}
pane.add(paneStroke);
// 将画笔颜色选择器添加到窗体中
this.add(pane, BorderLayout.NORTH);
// 将画图板添加到窗体中
this.add(palette);
// 添加窗口监听，点击关闭按钮时退出程序
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// 设置窗体 ICON 图标
this.setIconImage(Toolkit.getDefaultToolkit().createImage("images/palette.png"));
// 设置窗口的大小
this.setSize(new Dimension(400, 430));
// 设置窗口位置，处于屏幕正中央
this.setLocationRelativeTo(null);
// 显示窗口
this.setVisible(true);
}
/**
* 程序入口
*
* @param args
* 字符串数组参数
*/
public static void main(String[] args) {
new TestMain();
}
/**
* 选取颜色按钮的监听事件类
* @author 米强
*
*/
class ButtonColorAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
Color color_temp = ((Button)e.getSource()).getBackground();
nonceColor.setBackground(color_temp);
palette.setColor(color_temp);
}
}
/**
* 鼠标进入按钮变换光标样式监听事件类
* @author 米强
*
*/
class ButtonCursor extends MouseAdapter {
public void mouseEntered(MouseEvent e) {
((Button)e.getSource()).setCursor(new Cursor(Cursor.HAND_CURSOR));
}
public void mouseExited(MouseEvent e) {
((Button)e.getSource()).setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
}
/**
* 设置画笔的监听事件类
* @author 米强
*
*/
class ButtonStrokeAction implements ActionListener {
public void actionPerformed(ActionEvent e) {
Button button_temp = (Button) e.getSource();
String name = button_temp.getName();
if(name.equalsIgnoreCase("width")){
drawWidth.setText(button_temp.getLabel());
palette.setStroke(Float.parseFloat(button_temp.getLabel()));
}else if(name.equalsIgnoreCase("cap")){
drawCap.setText(button_temp.getLabel());
if(button_temp.getLabel().equals("■")){
palette.setStroke(BasicStroke.CAP_SQUARE);
}else if(button_temp.getLabel().equals("●")){
palette.setStroke(BasicStroke.CAP_ROUND);
}
}
}
}
}
/**
* 画板类
*
* @author 米强
*
*/
class Palette extends Panel implements MouseListener, MouseMotionListener {
// 鼠标 X 坐标的位置
private int mouseX = 0;
// 上一次 X 坐标位置
private int oldMouseX = 0;
// 鼠标 Y 坐标的位置
private int mouseY = 0;
// 上一次 Y 坐标位置
private int oldMouseY = 0;
// 画图颜色
private Color color = null;
// 画笔样式
private BasicStroke stroke = null;
// 缓存图形
private BufferedImage image = null;
/**
* 构造一个画板类
*
*/
public Palette() {
this.addMouseListener(this);
this.addMouseMotionListener(this);
// 默认黑色画笔
color = new Color(0, 0, 0);
// 设置默认画笔样式
stroke = new BasicStroke(3.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
// 建立 1280 * 1024 的 RGB 缓存图象
image = new BufferedImage(1280, 1024, BufferedImage.TYPE_INT_RGB);
// 设置颜色
image.getGraphics().setColor(Color.white);
// 画背景
image.getGraphics().fillRect(0, 0, 1280, 1024);
}
/**
* 重写 paint 绘图方法
*/
public void paint(Graphics g) {
super.paint(g);
// 转换为 Graphics2D
Graphics2D g2d = (Graphics2D) g;
// 获取缓存图形 Graphics2D
Graphics2D bg = image.createGraphics();
// 图形抗锯齿
bg.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// 设置绘图颜色
bg.setColor(color);
// 设置画笔样式
bg.setStroke(stroke);
// 画线，从上一个点到新的点
bg.drawLine(oldMouseX, oldMouseY, mouseX, mouseY);
// 将缓存中的图形画到画板上
g2d.drawImage(image, 0, 0, this);
}
/**
* 重写 update 方法
*/
public void update(Graphics g) {
this.paint(g);
}
/**
* @return stroke
*/
public BasicStroke getStroke() {
return stroke;
}
/**
* @param stroke 要设置的 stroke
*/
public void setStroke(BasicStroke stroke) {
this.stroke = stroke;
}
/**
* 设置画笔粗细
* @param width
*/
public void setStroke(float width) {
this.stroke = new BasicStroke(width, stroke.getEndCap(), stroke.getLineJoin());
}
/**
* 设置画笔端点的装饰
* @param cap 参考 java.awt.BasicStroke 类静态字段
*/
public void setStroke(int cap) {
this.stroke = new BasicStroke(stroke.getLineWidth(), cap, stroke.getLineJoin());
}
/**
* @return color
*/
public Color getColor() {
return color;
}
/**
* @param color 要设置的 color
*/
public void setColor(Color color) {
this.color = color;
}
public void mouseClicked(MouseEvent mouseEvent) {
}
/**
* 鼠标按下
*/
public void mousePressed(MouseEvent mouseEvent) {
this.oldMouseX = this.mouseX = mouseEvent.getX();
this.oldMouseY = this.mouseY = mouseEvent.getY();
repaint();
}
public void mouseReleased(MouseEvent mouseEvent) {
}
/**
* 鼠标进入棋盘
*/
public void mouseEntered(MouseEvent mouseEvent) {
this.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));
}
/**
* 鼠标退出棋盘
*/
public void mouseExited(MouseEvent mouseEvent) {
this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
/**
* 鼠标拖动
*/
public void mouseDragged(MouseEvent mouseEvent) {
this.oldMouseX = this.mouseX;
this.oldMouseY = this.mouseY;
this.mouseX = mouseEvent.getX();
this.mouseY = mouseEvent.getY();
repaint();
}
public void mouseMoved(MouseEvent mouseEvent) {
}
}
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