import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
/**
* 菜单处理监听器
*
* @author kowloon
*
*/
public class MenuListener implements ActionListener {
private MyPanel panel;
public MenuListener(MyPanel panel) {
this.panel = panel;
}
// bmp文件头
public void savebmpTop(OutputStream ops) throws Exception {
ops.write('B');
ops.write('M');
int height = DrawListener.array.length;
int width = DrawListener.array[0].length;
int size = 14 + 40 + height * width * 3 + (4 - width * 3 % 4) * height;
// 位图文件的大小
size = 14 + 40 + height * width * 3 + (4 - width * 3 % 4) * 255;
writeInt(ops, size);
// 保留字节，必须为零
writeShort(ops, (short) 0);
writeShort(ops, (short) 0);
// 位图偏移量
writeInt(ops, 54);
}
// 位图信息头
public void savebmpInfo(OutputStream ops) throws Exception {
int height = DrawListener.array.length;
int width = DrawListener.array[0].length;
// 位图信息头长度
writeInt(ops, 40);
// 位图宽
writeInt(ops, width);
// 位图高
writeInt(ops, height);
// 位图位面数总是为1
writeShort(ops, (short) 1);
// 位图24位像素
writeShort(ops, (short) 24);
// 位图是否被压缩，0为不压缩
writeInt(ops, 0);
// 字节数代表位图大小
writeInt(ops, height * width * 3 + (4 - width * 3 % 4) * height);
// 水平分辨率
writeInt(ops, 0);
// 垂直分辨率
writeInt(ops, 0);
// 颜色索引，0为所有调色板
writeInt(ops, 0);
// 对图象显示有重要影响的颜色索引的数目。如果是0，表示都重要
writeInt(ops, 0);
}
// 图像数据阵列
public void savebmpDate(OutputStream ops) throws Exception {
int height = DrawListener.array.length;
int width = DrawListener.array[0].length;
int m = 0;
// 进行补0，必须是4位，少于4位要补0
if (width * 3 % 4 > 0) {
m = 4 - width * 3 % 4;
}
for (int i = height - 1; i >= 0; i--) {
for (int j = 0; j < width; j++) {
int t = DrawListener.array[i][j];
writeColor(ops, t);
}
for (int k = 0; k < m; k++) {
ops.write(0);
}
}
}
public void writeInt(OutputStream ops, int t) throws Exception {
int a = (t >> 24) & 0xff;
int b = (t >> 16) & 0xff;
int c = (t >> 8) & 0xff;
int d = t & 0xff;
ops.write(d);
ops.write(c);
ops.write(b);
ops.write(a);
}
public void writeColor(OutputStream ops, int t) throws Exception {
int b = (t >> 16) & 0xff;
int c = (t >> 8) & 0xff;
int d = t & 0xff;
ops.write(d);
ops.write(c);
ops.write(b);
}
public void writeShort(OutputStream ops, short t) throws Exception {
int c = (t >> 8) & 0xff;
int d = t & 0xff;
ops.write(d);
ops.write(c);
}
// 由于读取的是字节，把读取到的4个byte转化成1个int
public int changeInt(InputStream ips) throws IOException {
int t1 = ips.read() & 0xff;
int t2 = ips.read() & 0xff;
int t3 = ips.read() & 0xff;
int t4 = ips.read() & 0xff;
int num = (t4 << 24) + (t3 << 16) + (t2 << 8) + t1;
System.out.println(num);
return num;
}
// 24位的图片是1个像素3个字节。
public int readColor(InputStream ips) throws IOException {
int b = ips.read() & 0xff;
int g = ips.read() & 0xff;
int r = ips.read() & 0xff;
int c = (r << 16) + (g << 8) + b;
return c;
}
public void actionPerformed(ActionEvent e) {
// 获得被点击的组件的动作命令
String command = e.getActionCommand();
JFileChooser chooser = new JFileChooser();
if (command.equals("保存")) {
int t = chooser.showSaveDialog(null);
if (t == JFileChooser.APPROVE_OPTION) {
String path = chooser.getSelectedFile().getAbsolutePath();
try {
FileOutputStream fos = new FileOutputStream(path);
DataOutputStream dos = new DataOutputStream(fos);
savebmpTop(dos);
savebmpInfo(dos);
savebmpDate(dos);
fos.flush();
fos.close();
} catch (Exception ef) {
JOptionPane.showMessageDialog(null, "文件保存失败！！");
ef.printStackTrace();
}
}
} else if (command.equals("打开")) {
int t = chooser.showOpenDialog(null);
if (t == JFileChooser.APPROVE_OPTION) {
String path = chooser.getSelectedFile().getAbsolutePath();
try {
FileInputStream fis = new FileInputStream(path);
DataInputStream dis = new DataInputStream(fis);
dis.skip(18);
int width = changeInt(dis);// 跳过不需要的，读取宽度和高度
int height = changeInt(dis);
dis.skip(28);
// 跳过，直接读取位图数据。
DrawListener.array = new int[height][width];
int w = 0;
if (width * 3 % 4 > 0) {
t = 4 - width * 3 % 4;
}
for (int i = height - 1; i >= 0; i--) {
for (int j = 0; j < width; j++) {
// 调用自定义方法，得到图片的像素点并保存到int数组中
int c = readColor(dis);
DrawListener.array[i][j] = c;
}
dis.skip(w);
}
fis.close();
// 刷新界面
panel.repaint();
} catch (Exception ef) {
JOptionPane.showMessageDialog(null, "文件打开失败！！");
ef.printStackTrace();
}
}
}
}
}