本文介绍了一个简单的Java画图板程序实现，支持多种图形绘制如直线、椭圆等，并提供了图形保存和加载的功能。文中详细展示了如何使用Java AWT和Swing库来创建用户界面及图形绘制逻辑。
该文章简要介绍java画图板的思路。
一、多种画图的函数
//绘制图形
if(type.equals("Line")){
g.drawLine(x1, y1, x2, y2);//(x1,y1)和（x2,y2）为直线的起点和终点
shape sh = new shape(1,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("Oval")){
g.drawOval(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2));//指定矩形边界内画圆
shape sh = new shape(2,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("Arc")){
String str1 = JOptionPane.showInputDialog(null, "请输入起始角度");
int r1 = Integer.parseInt(str1);
String str2 = JOptionPane.showInputDialog(null, "请输入结束角度");
int r2 = Integer.parseInt(str2);
g.drawArc(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2), r1, r2);//指定矩形边界内从起始角度到结束角度之间画弧
shape sh = new shape(3,x1, y1, x2, y2,r1, r2, c);
s.add(sh);
index++;
}
else if(type.equals("Rect")){
g.drawRect(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2));//(x1,y1)为矩形的其中一个点，Math.abs(x1-x2)为矩形的长, Math.abs(y1-y2)为矩形的宽
shape sh = new shape(4,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("RoundRect")){
g.drawRoundRect(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2),Math.abs(x1-x2)/6, Math.abs(y1-y2)/6);//(x1,y1)为矩形的其中一个点，Math.abs(x1-x2)为矩形的长, Math.abs(y1-y2)为矩形的宽,Math.abs(x1-x2)/6为圆角的弧宽, Math.abs(y1-y2）/6为圆角的弧高
shape sh = new shape(5,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("Bytes")){
String str1 = JOptionPane.showInputDialog(null, "请输入所需显示的字符串");
byte []data = str1.getBytes();
g.drawBytes(data,0,data.length,x1, y1);
shape sh = new shape(6,x1,y1,data, c);
s.add(sh);
index++;
}
else if(type.equals("Chars")){
String str1 = JOptionPane.showInputDialog(null, "请输入所需显示的字符串");
char []data = str1.toCharArray();
g.drawChars(data,0,data.length,x1, y1);
shape sh = new shape(7,x1,y1,data, c);
s.add(sh);
index++;
}
else if(type.equals("String")){
String str1 = JOptionPane.showInputDialog(null, "请输入所需显示的字符串");
g.drawString(str1,x1, y1);
shape sh = new shape(8,x1,y1,str1, c);
s.add(sh);
index++;
}
else if(type.equals("Image")){
g.drawImage(im.getImage(), x1, y1, Math.abs(x1-x2), Math.abs(y1-y2), this);
shape sh = new shape(9,x1, y1, x2, y2);
s.add(sh);
index++;
}
else if(type.equals("FillOval")){
g.fillOval(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2));//指定矩形边界内画椭圆
shape sh = new shape(10,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("FillArc")){
String str1 = JOptionPane.showInputDialog(null, "请输入起始角度");
int r1 = Integer.parseInt(str1);
String str2 = JOptionPane.showInputDialog(null, "请输入结束角度");
int r2 = Integer.parseInt(str2);
g.fillArc(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2), r1, r2);//指定矩形边界内从起始角度到结束角度之间画弧
shape sh = new shape(11,x1, y1, x2, y2,r1, r2, c);
s.add(sh);
index++;
}
else if(type.equals("FillRect")){
g.fillRect(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2));//(x1,y1)为矩形的其中一个点，Math.abs(x1-x2)为矩形的长, Math.abs(y1-y2)为矩形的宽
shape sh = new shape(12,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("FillRoundRect")){
g.fillRoundRect(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2),Math.abs(x1-x2)/6, Math.abs(y1-y2)/6);//(x1,y1)为矩形的其中一个点，Math.abs(x1-x2)为矩形的长, Math.abs(y1-y2)为矩形的宽,Math.abs(x1-x2)/6为圆角的弧宽, Math.abs(y1-y2）/6为圆角的弧高
shape sh = new shape(13,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
if(type.equals("Draw")){
g.drawLine(x1,y1,x3,y3);//(x1,y1)和（x2,y2）为直线的起点和终点
shape sh = new shape(1,x1, y1, x3, y3, c);
s.add(sh);
index++;
x1 = x3;
y1 = y3;
}
else if(type.equals("Line")){
dr.paint(g);
g.drawLine(x1,y1,x3,y3);
}
并且通过paint()函数实现画图板的重绘。
二、画图板信息的保存
通过DataOutputStream类的包装，将图形的信息输出并保存在指定文件里面。
public void saveShape(String pathname) throws IOException{
OutputStream out = new FileOutputStream(pathname);
DataOutputStream dop = new DataOutputStream(out);
dop.writeInt(s.size());
for(int i = 0;i<s.size();i++){
if(s.get(i).name==1){
dop.writeInt(1);//1为直线
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==2){
dop.writeInt(2);//2为椭圆
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==3){
dop.writeInt(3);//3为Arc
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).arc1);
dop.writeInt(s.get(i).arc2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==4){
dop.writeInt(4);//4为长方形
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==5){
dop.writeInt(5);//5为圆角长方形
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==6){
dop.writeInt(6);//6为字节
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).data1.length);//字节数组长度
dop.write(s.get(i).data1);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==7){
dop.writeInt(7);//7为字符
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
String st = new String(s.get(i).data2);
dop.writeInt(st.getBytes().length);//字节数组长度
dop.write(st.getBytes());
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==8){
dop.writeInt(8);//8为字符串
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).str1.getBytes().length);//字节数组长度
dop.write(s.get(i).str1.getBytes());
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==9){
dop.writeInt(9);//9为图片
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
}
else if(s.get(i).name==10){
dop.writeInt(10);//10为椭圆
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==11){
dop.writeInt(11);//11为Arc
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).arc1);
dop.writeInt(s.get(i).arc2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==12){
dop.writeInt(12);//12为长方形
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==13){
dop.writeInt(13);//13为圆角长方形
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==14){
dop.writeInt(14);//14为多边形
dop.writeInt(s.get(i).num);
for(int j = 0;j<s.get(i).num;j++){
dop.writeInt(s.get(i).X[j]);
dop.writeInt(s.get(i).Y[j]);
}
dop.writeInt(s.get(i).color.getRGB());
}
}
}
二、画图板信息的读取
通过DataInputStream类，将图形的信息从指定文件中输出并用重绘函数绘制在画图板上。读取顺序必须与存储信息的顺序一致。
public void readShape(DataInputStream in) throws IOException{
int size = in.readInt();
for(int i = 0;i<size;i++){
shape sh = new shape();
sh.name = in.readInt();
if(sh.name == 1){//直线
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 2){//椭圆
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 3){//arc
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.arc1 = in.readInt();
sh.arc2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 4){//长方形
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 5){//圆角长方形
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 6){//字节
sh.x1 = in.readInt();
sh.y1 = in.readInt();
int length = in.readInt();
sh.data1 = new byte[length];
in.read(sh.data1);
sh.color = new Color(in.readInt());
}
else if(sh.name == 7){//字符
sh.x1 = in.readInt();
sh.y1 = in.readInt();
int length = in.readInt();
byte[] bArr = new byte[length];
in.read(bArr);
String a = new String(bArr);
sh.data2 = a.toCharArray();
sh.color = new Color(in.readInt());
}
else if(sh.name == 8){//字符串
sh.x1 = in.readInt();
sh.y1 = in.readInt();
int length = in.readInt();
byte[] bArr = new byte[length];
in.read(bArr);
sh.str1 = new String(bArr);
sh.color = new Color(in.readInt());
}
else if(sh.name == 9){//图片
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
}
else if(sh.name == 10){//椭圆
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 11){//arc
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.arc1 = in.readInt();
sh.arc2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 12){//fill长方形
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 13){//fill圆角长方形
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 14){//多边形
sh.num = in.readInt();
for(int j = 0;j<sh.num;j++){
sh.X[j] = in.readInt();
sh.Y[j] = in.readInt();
}
sh.color = new Color(in.readInt());
}
s.add(sh);
}
}
下附完整代码：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class drawing extends JPanel {
/**
* @param args
*/
private ArrayList<shape> s;
private ImageIcon im = new ImageIcon(this.getClass().getResource("login.png"));
public static void main(String[] args) {
// TODO Auto-generatedmethod stub
drawing d = new drawing();
d.UIinit();
}
public void UIinit() {
JFrame frame = new JFrame();
frame.setTitle("画图");
frame.setSize(700, 600);
frame.setDefaultCloseOperation(3);
frame.setLocationRelativeTo(null);
// 实例化drawinglistener事件处理类的对象
drawlistener dl = new drawlistener(this);
// 北边面板
JPanel jp1 = new JPanel();
jp1.setBackground(Color.GRAY);
jp1.setPreferredSize(new Dimension(0, 110));
// 添加按钮
String[] name = { "Draw","Line", "Oval", "Arc", "Rect", "RoundRect",
"Polygon", "Bytes", "Chars", "String", "Image", "FillOval",
"FillArc", "FillRect", "FillRoundRect", " 打开 ", " 保存 " };
for (int i = 0; i < name.length; i++) {
JButton bu = new JButton(name[i]);
bu.addActionListener(dl);// 按钮上的监听
jp1.add(bu);
}
Color[] color = {Color.red,Color.blue,Color.GREEN,Color.cyan};
for (int j = 0; j < color.length; j++){
JButton bu = new JButton();
bu.setBackground(color[j]);
bu.setPreferredSize(new Dimension(30, 30));
bu.addActionListener(dl);// 按钮上的监听
jp1.add(bu);
}
frame.add(jp1, BorderLayout.NORTH);
// 中间画图面板
this.setBackground(Color.WHITE);
frame.add(this, BorderLayout.CENTER);
frame.setVisible(true);
// 添加鼠标监听
this.addMouseListener(dl);
this.addMouseMotionListener(dl);
s = dl.getshape();
}
public void paint(Graphics g) {
super.paint(g);
for (int i = 0; i < s.size(); i++) {
if (s.get(i) != null) {
g.setColor(s.get(i).color);
if (s.get(i).name==1) {
g.drawLine(s.get(i).x1, s.get(i).y1, s.get(i).x2, s.get(i).y2);
}
else if (s.get(i).name==1) {
g.drawLine(s.get(i).x1,s.get(i).y1,s.get(i).x2,s.get(i).y2);
}
else if (s.get(i).name==2) {
g.drawOval(s.get(i).x1, s.get(i).y1, Math.abs(s.get(i).x1 - s.get(i).x2),
Math.abs(s.get(i).y1 - s.get(i).y2));
}
else if (s.get(i).name==3) {
g.drawArc(s.get(i).x1, s.get(i).y1, Math.abs(s.get(i).x1 - s.get(i).x2),
Math.abs(s.get(i).y1 - s.get(i).y2),s.get(i).arc1,s.get(i).arc2);
}
else if (s.get(i).name==4) {
g.drawRect(s.get(i).x1, s.get(i).y1, Math.abs(s.get(i).x1 - s.get(i).x2),
Math.abs(s.get(i).y1 - s.get(i).y2));
}
else if (s.get(i).name==5) {
g.drawRoundRect(s.get(i).x1, s.get(i).y1,
Math.abs(s.get(i).x1 - s.get(i).x2),
Math.abs(s.get(i).y1 - s.get(i).y2),
Math.abs(s.get(i).x1 - s.get(i).x2) / 6,
Math.abs(s.get(i).y1 - s.get(i).y2) / 6);
}
else if (s.get(i).name==6) {
g.drawBytes(s.get(i).data1, 0, s.get(i).data1.length, s.get(i).x1,
s.get(i).y1);
}
else if (s.get(i).name==7) {
g.drawChars(s.get(i).data2, 0, s.get(i).data2.length, s.get(i).x1,
s.get(i).y1);
}
else if (s.get(i).name==8) {
g.drawString(s.get(i).str1, s.get(i).x1, s.get(i).y1);
}
else if (s.get(i).name==9) {
g.drawImage(im.getImage(),s.get(i).x1, s.get(i).y1,
Math.abs(s.get(i).x1 - s.get(i).x2),
Math.abs(s.get(i).y1 - s.get(i).y2), this);
}
else if (s.get(i).name==10) {
g.fillOval(s.get(i).x1, s.get(i).y1, Math.abs(s.get(i).x1 - s.get(i).x2),
Math.abs(s.get(i).y1 - s.get(i).y2));
}
else if (s.get(i).name==11) {
g.fillArc(s.get(i).x1, s.get(i).y1, Math.abs(s.get(i).x1 - s.get(i).x2),
Math.abs(s.get(i).y1 - s.get(i).y2), s.get(i).arc1, s.get(i).arc2);// 指定矩形边界内从起始角度到结束角度之间画弧
}
else if (s.get(i).name==12) {
g.fillRect(s.get(i).x1, s.get(i).y1, Math.abs(s.get(i).x1 - s.get(i).x2),
Math.abs(s.get(i).y1 - s.get(i).y2));
}
else if (s.get(i).name==13) {
g.fillRoundRect(s.get(i).x1, s.get(i).y1,
Math.abs(s.get(i).x1 - s.get(i).x2),
Math.abs(s.get(i).y1 - s.get(i).y2),
Math.abs(s.get(i).x1 - s.get(i).x2) / 6,
Math.abs(s.get(i).y1 - s.get(i).y2) / 6);
}
else if (s.get(i).name==14) {
g.drawPolygon(s.get(i).X, s.get(i).Y, s.get(i).num);
}
}
}
}
public void saveShape(String pathname) throws IOException{
OutputStream out = new FileOutputStream(pathname);
DataOutputStream dop = new DataOutputStream(out);
dop.writeInt(s.size());
for(int i = 0;i<s.size();i++){
if(s.get(i).name==1){
dop.writeInt(1);//1为直线
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==2){
dop.writeInt(2);//2为椭圆
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==3){
dop.writeInt(3);//3为Arc
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).arc1);
dop.writeInt(s.get(i).arc2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==4){
dop.writeInt(4);//4为长方形
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==5){
dop.writeInt(5);//5为圆角长方形
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==6){
dop.writeInt(6);//6为字节
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).data1.length);//字节数组长度
dop.write(s.get(i).data1);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==7){
dop.writeInt(7);//7为字符
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
String st = new String(s.get(i).data2);
dop.writeInt(st.getBytes().length);//字节数组长度
dop.write(st.getBytes());
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==8){
dop.writeInt(8);//8为字符串
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).str1.getBytes().length);//字节数组长度
dop.write(s.get(i).str1.getBytes());
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==9){
dop.writeInt(9);//9为图片
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
}
else if(s.get(i).name==10){
dop.writeInt(10);//10为椭圆
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==11){
dop.writeInt(11);//11为Arc
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).arc1);
dop.writeInt(s.get(i).arc2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==12){
dop.writeInt(12);//12为长方形
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==13){
dop.writeInt(13);//13为圆角长方形
dop.writeInt(s.get(i).x1);
dop.writeInt(s.get(i).y1);
dop.writeInt(s.get(i).x2);
dop.writeInt(s.get(i).y2);
dop.writeInt(s.get(i).color.getRGB());
}
else if(s.get(i).name==14){
dop.writeInt(14);//14为多边形
dop.writeInt(s.get(i).num);
for(int j = 0;j<s.get(i).num;j++){
dop.writeInt(s.get(i).X[j]);
dop.writeInt(s.get(i).Y[j]);
}
dop.writeInt(s.get(i).color.getRGB());
}
}
}
public void readShape(DataInputStream in) throws IOException{
int size = in.readInt();
for(int i = 0;i<size;i++){
shape sh = new shape();
sh.name = in.readInt();
if(sh.name == 1){//直线
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 2){//椭圆
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 3){//arc
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.arc1 = in.readInt();
sh.arc2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 4){//长方形
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 5){//圆角长方形
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 6){//字节
sh.x1 = in.readInt();
sh.y1 = in.readInt();
int length = in.readInt();
sh.data1 = new byte[length];
in.read(sh.data1);
sh.color = new Color(in.readInt());
}
else if(sh.name == 7){//字符
sh.x1 = in.readInt();
sh.y1 = in.readInt();
int length = in.readInt();
byte[] bArr = new byte[length];
in.read(bArr);
String a = new String(bArr);
sh.data2 = a.toCharArray();
sh.color = new Color(in.readInt());
}
else if(sh.name == 8){//字符串
sh.x1 = in.readInt();
sh.y1 = in.readInt();
int length = in.readInt();
byte[] bArr = new byte[length];
in.read(bArr);
sh.str1 = new String(bArr);
sh.color = new Color(in.readInt());
}
else if(sh.name == 9){//图片
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
}
else if(sh.name == 10){//椭圆
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 11){//arc
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.arc1 = in.readInt();
sh.arc2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 12){//fill长方形
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 13){//fill圆角长方形
sh.x1 = in.readInt();
sh.y1 = in.readInt();
sh.x2 = in.readInt();
sh.y2 = in.readInt();
sh.color = new Color(in.readInt());
}
else if(sh.name == 14){//多边形
sh.num = in.readInt();
for(int j = 0;j<sh.num;j++){
sh.X[j] = in.readInt();
sh.Y[j] = in.readInt();
}
sh.color = new Color(in.readInt());
}
s.add(sh);
}
}
}
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.image.ImageObserver;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
public class drawlistener implementsActionListener,MouseListener,ImageObserver,MouseMotionListener{
private drawing dr = new drawing();
private String type = "Draw";
private Color c = Color.BLACK;
private int x1,y1,x2,y2,x3,y3;
private Graphics g;
private int X[] = new int[20],Y[] = new int[20];
private int num = 0;
private ImageIcon im = new ImageIcon(this.getClass().getResource("login.png"));
private ArrayList<shape> s =new ArrayList<shape>();
private int index = 0;
public ArrayList<shape> getshape(){
return s;
}
//构造函数
public drawlistener(drawing dr){
this.dr = dr;
}
public void actionPerformed(ActionEvent e){
if("".equals(e.getActionCommand())){
JButton jbu = (JButton)e.getSource();
c = jbu.getBackground();
}
else{
type = e.getActionCommand();
}
if(type.equals(" 打开 ")){
String path = null;
//显示一个文件选择器
JFileChooser chooser = new JFileChooser();
int returnVal = chooser.showOpenDialog(null);//返回值
if(returnVal ==JFileChooser.APPROVE_OPTION) {
path =chooser.getSelectedFile().getAbsolutePath();
}
File file = new File(path);
try {
DataInputStream dis = new DataInputStream(new FileInputStream(file));
s.removeAll(s);
dr.readShape(dis);
g = dr.getGraphics();
dr.paint(g);
} catch (FileNotFoundException e1) {
// TODO Auto-generatedcatch block
e1.printStackTrace();
} catch (IOException e1) {
// TODO Auto-generatedcatch block
e1.printStackTrace();
}
}
else if(type.equals(" 保存 ")){
String path = null;
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.SAVE_DIALOG |JFileChooser.DIRECTORIES_ONLY);
chooser.showSaveDialog(null);
int returnVal = chooser.showOpenDialog(null);//返回值
if(returnVal == JFileChooser.APPROVE_OPTION) {
path =chooser.getSelectedFile().getAbsolutePath();
}
try {
dr.saveShape(path+"\\"+"shape.shap");
} catch (IOException e1) {
// TODO Auto-generatedcatch block
e1.printStackTrace();
}
}
}
public boolean imageUpdate(java.awt.Image arg0, int arg1, int arg2, int arg3, int arg4, int arg5){
return false;
}
public void mouseDragged(MouseEvent m){
x3 = m.getX();
y3 = m.getY();
g.setColor(c);
if(type.equals("Draw")){
g.drawLine(x1,y1,x3,y3);//(x1,y1)和（x2,y2）为直线的起点和终点
shape sh = new shape(1,x1, y1, x3, y3, c);
s.add(sh);
index++;
x1 = x3;
y1 = y3;
}
else if(type.equals("Line")){
dr.paint(g);
g.drawLine(x1,y1,x3,y3);
}
}
public void mouseMoved(MouseEvent m){
}
public void mouseClicked(MouseEvent m){
if(m.getClickCount() == 2){
if(type.equals("Polygon")){
g.setColor(c);
g.drawPolygon(X, Y, num);
shape sh = new shape(14,X, Y, num,c);
s.add(sh);
index++;
num = 0;
}
}
else{
X[num] = m.getX();
Y[num] = m.getY();
num++;
}
}
public void mousePressed(MouseEvent m){
x1 = m.getX();
y1 = m.getY();
//获取面板上画笔画布对象
g = dr.getGraphics();
}
public void mouseReleased(MouseEvent m){
x2 = m.getX();
y2 = m.getY();
g.setColor(c);
//绘制图形
if(type.equals("Line")){
g.drawLine(x1, y1, x2, y2);//(x1,y1)和（x2,y2）为直线的起点和终点
shape sh = new shape(1,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("Oval")){
g.drawOval(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2));//指定矩形边界内画圆
shape sh = new shape(2,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("Arc")){
String str1 = JOptionPane.showInputDialog(null, "请输入起始角度");
int r1 = Integer.parseInt(str1);
String str2 = JOptionPane.showInputDialog(null, "请输入结束角度");
int r2 = Integer.parseInt(str2);
g.drawArc(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2), r1, r2);//指定矩形边界内从起始角度到结束角度之间画弧
shape sh = new shape(3,x1, y1, x2, y2,r1, r2, c);
s.add(sh);
index++;
}
else if(type.equals("Rect")){
g.drawRect(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2));//(x1,y1)为矩形的其中一个点，Math.abs(x1-x2)为矩形的长, Math.abs(y1-y2)为矩形的宽
shape sh = new shape(4,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("RoundRect")){
g.drawRoundRect(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2),Math.abs(x1-x2)/6, Math.abs(y1-y2)/6);//(x1,y1)为矩形的其中一个点，Math.abs(x1-x2)为矩形的长, Math.abs(y1-y2)为矩形的宽,Math.abs(x1-x2)/6为圆角的弧宽, Math.abs(y1-y2）/6为圆角的弧高
shape sh = new shape(5,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("Bytes")){
String str1 = JOptionPane.showInputDialog(null, "请输入所需显示的字符串");
byte []data = str1.getBytes();
g.drawBytes(data,0,data.length,x1, y1);
shape sh = new shape(6,x1,y1,data, c);
s.add(sh);
index++;
}
else if(type.equals("Chars")){
String str1 = JOptionPane.showInputDialog(null, "请输入所需显示的字符串");
char []data = str1.toCharArray();
g.drawChars(data,0,data.length,x1, y1);
shape sh = new shape(7,x1,y1,data, c);
s.add(sh);
index++;
}
else if(type.equals("String")){
String str1 = JOptionPane.showInputDialog(null, "请输入所需显示的字符串");
g.drawString(str1,x1, y1);
shape sh = new shape(8,x1,y1,str1, c);
s.add(sh);
index++;
}
else if(type.equals("Image")){
g.drawImage(im.getImage(), x1, y1, Math.abs(x1-x2), Math.abs(y1-y2), this);
shape sh = new shape(9,x1, y1, x2, y2);
s.add(sh);
index++;
}
else if(type.equals("FillOval")){
g.fillOval(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2));//指定矩形边界内画椭圆
shape sh = new shape(10,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("FillArc")){
String str1 = JOptionPane.showInputDialog(null, "请输入起始角度");
int r1 = Integer.parseInt(str1);
String str2 = JOptionPane.showInputDialog(null, "请输入结束角度");
int r2 = Integer.parseInt(str2);
g.fillArc(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2), r1, r2);//指定矩形边界内从起始角度到结束角度之间画弧
shape sh = new shape(11,x1, y1, x2, y2,r1, r2, c);
s.add(sh);
index++;
}
else if(type.equals("FillRect")){
g.fillRect(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2));//(x1,y1)为矩形的其中一个点，Math.abs(x1-x2)为矩形的长, Math.abs(y1-y2)为矩形的宽
shape sh = new shape(12,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
else if(type.equals("FillRoundRect")){
g.fillRoundRect(x1, y1, Math.abs(x1-x2), Math.abs(y1-y2),Math.abs(x1-x2)/6, Math.abs(y1-y2)/6);//(x1,y1)为矩形的其中一个点，Math.abs(x1-x2)为矩形的长, Math.abs(y1-y2)为矩形的宽,Math.abs(x1-x2)/6为圆角的弧宽, Math.abs(y1-y2）/6为圆角的弧高
shape sh = new shape(13,x1, y1, x2, y2, c);
s.add(sh);
index++;
}
}
public void mouseEntered(MouseEvent m){
}
public void mouseExited(MouseEvent m){
}
}
import java.awt.Color;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
public class shape {
int name;
Color color;
int arc1,arc2;
int x1,y1,x2,y2;
int X[] = new int[20],Y[] = new int[20];
int num = 0;
byte []data1;
char []data2;
String str1;
public shape(int name, int x1, int y1, char []data2, Color color) {
this.name = name;
this.x1 = x1;
this.y1 = y1;
this.data2 = data2;
this.color = color;
}
public shape(int name, int x1, int y1, String str1, Color color) {
this.name = name;
this.x1 = x1;
this.y1 = y1;
this.str1 = str1;
this.color = color;
}
public shape(int name, int x1, int y1, byte[] data1, Color color) {
this.name = name;
this.x1 = x1;
this.y1 = y1;
this.data1 = data1;
this.color = color;
}
public shape(int name,int x1, int y1, int x2, int y2, Color color) {
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
this.name = name;
this.color = color;
}
public shape(int name ,int x1, int y1, int x2,
int y2, int arc1, int arc2, Color color) {
this.name = name;
this.arc1 = arc1;
this.arc2 = arc2;
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
this.color = color;
}
public shape(int name, int[] x, int[] y, int num, Color color) {
X = x;
Y = y;
this.num = num;
this.name = name;
this.color = color;
}
public shape(int name,int x1, int y1, int x2, int y2) {
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
this.name = name;
}
public shape() {
// TODO Auto-generatedconstructor stub
}
public byte[] Intobyte(int number){
byte[] turn = new byte[4];//int为4个字节，转化为字节数组，数组长度为4
turn[0] = (byte) (number%256);
number = number/256;
turn[1] = (byte) (number%256);
number = number/256;
turn[2] = (byte) (number%256);
turn[3] = (byte) (number/256);
return turn;
}
}
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