JAVA繪圖板

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;

/**

* 簡單繪圖板程序

*

* @author 何青松

* @version 1.0

*/

public class UI extends Frame {

// 畫板

private Palette palette = null;

// 顯示當前顏色的面板

private Panel nonceColor = null;

// 畫筆粗細

private Label drawWidth = null;

// 畫筆端點的裝飾

private Label drawCap = null;

// 選取顏色按鈕的監聽事件類

private ButtonColorAction buttonColorAction = null;

// 鼠標進入按鈕后光標樣式的監聽事件類

private ButtonCursor buttonCursor = null;

// 畫筆樣式的監聽事件

private ButtonStrokeAction buttonStrokeAction = null;

/**

* 構造方法

*

*/

public UI() {

// 設置標題欄文字

super("繪圖板");

// 構造一個繪圖板

palette = new Palette();

Panel pane = new Panel(new GridLayout(2, 1));

// 畫筆顏色選擇器

Panel paneColor = new Panel(new GridLayout(1, 13));

// 12 個顏色選擇按鈕

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};

// 顯示當前顏色的面板

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);

// 畫筆顏色選擇器

Panel paneStroke = new Panel(new GridLayout(1, 13));

// 控制畫筆樣式

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);

// 將畫筆顏色選擇器加入到窗體中

this.add(pane, BorderLayout.NORTH);

// 將繪圖板加入到窗體中

this.add(palette);

// 加入窗體監聽，點擊關閉按鈕時退出程序

this.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

// 設置窗體 ICON 圖標

this.setIconImage(Toolkit.getDefaultToolkit().createImage("images/palette.png"));

// 設置窗體的大小

this.setSize(new Dimension(400, 430));

// 設置窗體位置，處于屏幕正中央

this.setLocationRelativeTo(null);

// 顯示窗體

this.setVisible(true);

}

/**

* 程序入口

*

* @param args

* 字符串數組參數

*/

public static void main(String[] args) {

new UI();

}

/**

* 選取顏色按鈕的監聽事件類

* @author 何青松

*

*/

class ButtonColorAction implements ActionListener {

public void actionPerformed(ActionEvent e) {

Color color_temp = ((Button)e.getSource()).getBackground();

nonceColor.setBackground(color_temp);

palette.setColor(color_temp);

}

}

/**

* 鼠標進入按鈕變換光標樣式監聽事件類

* @author 何青松

*

*/

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));

}

}

/**

* 設置畫筆的監聽事件類

* @author 何青松

*

*/

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);

}

}

}

}

}

/**

* 畫板類

*

* @author 何青松

*

*/

class Palette extends Panel implements MouseListener, MouseMotionListener {

// 鼠標 X 坐標的位置

private int mouseX = 0;

// 上一次 X 坐標位置

private int oldMouseX = 0;

// 鼠標 Y 坐標的位置

private int mouseY = 0;

// 上一次 Y 坐標位置

private int oldMouseY = 0;

// 繪圖顏色

private Color color = null;

// 畫筆樣式

private BasicStroke stroke = null;

// 緩存圖形

private BufferedImage image = null;

/**

* 構造一個畫板類

*

*/

public Palette() {

this.addMouseListener(this);

this.addMouseMotionListener(this);

// 默認黑色畫筆

color = new Color(0, 0, 0);

// 設置默認畫筆樣式

stroke = new BasicStroke(3.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);

// 建立 1280 * 1024 的 RGB 緩存圖象

image = new BufferedImage(1280, 1024, BufferedImage.TYPE_INT_RGB);

// 設置顏色

image.getGraphics().setColor(Color.white);

// 畫背景

image.getGraphics().fillRect(0, 0, 1280, 1024);

}

/**

* 重寫 paint 繪圖方法

*/

public void paint(Graphics g) {

super.paint(g);

// 轉換為 Graphics2D

Graphics2D g2d = (Graphics2D) g;

// 獲取緩存圖形 Graphics2D

Graphics2D bg = image.createGraphics();

// 圖形抗鋸齒

bg.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

// 設置繪圖顏色

bg.setColor(color);

// 設置畫筆樣式

bg.setStroke(stroke);

// 畫線，從上一個點到新的點

bg.drawLine(oldMouseX, oldMouseY, mouseX, mouseY);

// 將緩存中的圖形畫到畫板上

g2d.drawImage(image, 0, 0, this);

}

/**

* 重寫 update 方法

*/

public void update(Graphics g) {

this.paint(g);

}

/**

* @return stroke

*/

public BasicStroke getStroke() {

return stroke;

}

/**

* @param stroke 要設置的 stroke

*/

public void setStroke(BasicStroke stroke) {

this.stroke = stroke;

}

/**

* 設置畫筆粗細

* @param width

*/

public void setStroke(float width) {

this.stroke = new BasicStroke(width, stroke.getEndCap(), stroke.getLineJoin());

}

/**

* 設置畫筆端點的裝飾

* @param cap 參考 java.awt.BasicStroke 類靜態字段

*/

public void setStroke(int cap) {

this.stroke = new BasicStroke(stroke.getLineWidth(), cap, stroke.getLineJoin());

}

/**

* @return color

*/

public Color getColor() {

return color;

}

/**

* @param color 要設置的 color

*/

public void setColor(Color color) {

this.color = color;

}

public void mouseClicked(MouseEvent mouseEvent) {

}

/**

* 鼠標按下

*/

public void mousePressed(MouseEvent mouseEvent) {

this.oldMouseX = this.mouseX = mouseEvent.getX();

this.oldMouseY = this.mouseY = mouseEvent.getY();

repaint();

}

public void mouseReleased(MouseEvent mouseEvent) {

}

/**

* 鼠標進入棋盤

*/

public void mouseEntered(MouseEvent mouseEvent) {

this.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));

}

/**

* 鼠標退出棋盤

*/

public void mouseExited(MouseEvent mouseEvent) {

this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));

}

/**

* 鼠標拖動

*/

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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