Java 将矩阵(二维数组)旋转X.XX°;
我找不到关于以下主题的任何内容,因为大多数问题都要求将阵列旋转90°、180°、270°,这实际上很容易 我需要为各种可能的度数旋转矩阵,就像我在photoshop中旋转图像一样(以编程方式,我不需要GUI或类似的东西)。这将导致结果中的小错误,这不会带来太多麻烦 图片旋转应该是一种非常类似的方法,所以我认为应该有很多解决这个问题的方法。java中有没有一种简单的方法可以做到这一点,或者我必须自己计算每个条目的位置 注意:我使用的数组是一个“二进制”数组,由值为“0”和“1”的整数填充 PS:这将改变矩阵周围“边界框”的大小。在这一点上没有问题Java 将矩阵(二维数组)旋转X.XX°;,java,arrays,matrix,Java,Arrays,Matrix,我找不到关于以下主题的任何内容,因为大多数问题都要求将阵列旋转90°、180°、270°,这实际上很容易 我需要为各种可能的度数旋转矩阵,就像我在photoshop中旋转图像一样(以编程方式,我不需要GUI或类似的东西)。这将导致结果中的小错误,这不会带来太多麻烦 图片旋转应该是一种非常类似的方法,所以我认为应该有很多解决这个问题的方法。java中有没有一种简单的方法可以做到这一点,或者我必须自己计算每个条目的位置 注意:我使用的数组是一个“二进制”数组,由值为“0”和“1”的整数填充 PS:这
编辑:我试着给出一个例子,这可能是什么样子: 首字母:
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 0, 1 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 1, 0, 0 }
在旋转点[3][2]处旋转20.12°
结果:
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 0, 1 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 0, 1, 0 }
{ 0, 1, 0, 0 }
这看起来毫无用处,但这个矩阵的大小越大,结果就越准确。我使用的矩阵比这个例子大得多。:) 我将编写两种方法:一种是将数组转换为BuffereImage,另一种是反过来。这两件事都应该易于实现。BuffereImage可以使用仿射变换等进行旋转。
不是很优雅,但使用标准java代码时不需要第三方的东西。
您可以通过图像以图形方式显示结果。
此实现实现实现了上述功能:
package rasterImage;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
public class MatrixRotator extends javax.swing.JFrame {
public MatrixRotator() {
initComponents();
setLocationRelativeTo(null);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jButtonDoIt = new javax.swing.JButton();
jPanelOrg = new javax.swing.JPanel();
jPanelRot = new javax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButtonDoIt.setText("Do it");
jButtonDoIt.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButtonDoItActionPerformed(evt);
}
});
jPanelOrg.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
javax.swing.GroupLayout jPanelOrgLayout = new javax.swing.GroupLayout(jPanelOrg);
jPanelOrg.setLayout(jPanelOrgLayout);
jPanelOrgLayout.setHorizontalGroup(
jPanelOrgLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 100, Short.MAX_VALUE)
);
jPanelOrgLayout.setVerticalGroup(
jPanelOrgLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 100, Short.MAX_VALUE)
);
jPanelRot.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
javax.swing.GroupLayout jPanelRotLayout = new javax.swing.GroupLayout(jPanelRot);
jPanelRot.setLayout(jPanelRotLayout);
jPanelRotLayout.setHorizontalGroup(
jPanelRotLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 100, Short.MAX_VALUE)
);
jPanelRotLayout.setVerticalGroup(
jPanelRotLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 100, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButtonDoIt)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanelOrg, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jPanelRot, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jPanelRot, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(jButtonDoIt)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jPanelOrg, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void printRaster(int[][] raster) {
int rows = raster.length;
int cols = raster[0].length;
for (int r = 0; r < rows; r++) {
for (int c = 0; c < cols; c++) {
int content = raster[r][c];
System.out.print(content);
}
System.out.println();
}
}
private BufferedImage convert2image(int[][] raster) {
int rows = raster.length;
int cols = raster[0].length;
BufferedImage img = new BufferedImage(cols, rows, BufferedImage.TYPE_BYTE_BINARY);
Graphics2D g = img.createGraphics();
for (int r = 0; r < rows; r++) {
for (int c = 0; c < cols; c++) {
int content = raster[r][c];
if (content == 1) {
g.fillRect(c, r, 1, 1);
}
}
}
return img;
}
private int[][] convert2raster(BufferedImage img) {
int cols = img.getWidth();
int rows = img.getHeight();
int[][] raster = new int[rows][cols];
for (int r = 0; r < rows; r++) {
for (int c = 0; c < cols; c++) {
int content = img.getRGB(c, r);
if (content == -1) {
raster[r][c] = 1;
} else {
raster[r][c] = 0;
}
}
}
return raster;
}
private void jButtonDoItActionPerformed(java.awt.event.ActionEvent evt) {
int[][] raster = {{0, 0, 1, 0}, {0, 0, 1, 0}, {0, 0, 1, 0}, {0, 0, 1, 0}, {0, 0, 1, 0}, {0, 0, 1, 0}};
printRaster(raster);
//convert raster to image:
BufferedImage img = convert2image(raster);
//create rotated image ('large enough'):
BufferedImage imgRot = new BufferedImage(10, 10, BufferedImage.TYPE_BYTE_BINARY);
//rotate the image:
AffineTransform tx = new AffineTransform();
tx.rotate(Math.toRadians(20.12));
imgRot.createGraphics().drawImage(img, tx, null);
//convert image to raster:
raster = convert2raster(imgRot);
printRaster(raster);
//draw it:
jPanelOrg.getGraphics().drawImage(img, 0, 0, null);
jPanelRot.getGraphics().drawImage(imgRot, 0, 0, null);
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new MatrixRotator().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButtonDoIt;
private javax.swing.JPanel jPanelOrg;
private javax.swing.JPanel jPanelRot;
// End of variables declaration
}
包光栅图像;
导入java.awt.Graphics2D;
导入java.awt.geom.AffineTransform;
导入java.awt.image.buffereImage;
公共类MatrixRotator扩展了javax.swing.JFrame{
公共矩阵旋转器(){
初始化组件();
setLocationRelativeTo(空);
}
@抑制警告(“未选中”)
//
私有组件(){
jButtonDoIt=newjavax.swing.JButton();
jpanelog=newjavax.swing.JPanel();
jPanelRot=newjavax.swing.JPanel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButtonDoIt.setText(“做它”);
jButtonDoIt.addActionListener(新java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
执行JButtonDoitAction(evt);
}
});
setboorder(javax.swing.BorderFactory.createLineBorder(新java.awt.Color(0,0,0));
javax.swing.GroupLayout=newjavax.swing.GroupLayout(jpanelog);
jpanelog.setLayout(jpaneloglayout);
jpaneloglayout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,100,短。最大值)
);
jpaneloglayout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,100,短。最大值)
);
setBorder(javax.swing.BorderFactory.createLineBorder(新java.awt.Color(0,0,0));
javax.swing.GroupLayout jpanelrotloayout=新的javax.swing.GroupLayout(jPanelRot);
setLayout(jpanelrottlayout);
jPanelRotLayout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,100,短。最大值)
);
jPanelRotLayout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0,100,短。最大值)
);
javax.swing.GroupLayout=newjavax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(布局);
layout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButtonDoIt)
.addGroup(layout.createSequentialGroup()
.addComponent(jpanelog、javax.swing.GroupLayout.PREFERRED\u SIZE、javax.swing.GroupLayout.DEFAULT\u SIZE、javax.swing.GroupLayout.PREFERRED\u SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jPanelRot,javax.swing.GroupLayout.PREFERRED\u SIZE,javax.swing.GroupLayout.DEFAULT\u SIZE,javax.swing.GroupLayout.PREFERRED\u SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT\u SIZE,Short.MAX\u VALUE))
);
layout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.training)
.addComponent(jPanelRot、javax.swing.GroupLayout.PREFERRED\u SIZE、javax.swing.GroupLayout.DEFAULT\u SIZE、javax.swing.GroupLayout.PREFERRED\u SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(jButtonDoIt)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jpanelog、javax.swing.GroupLayout.PREFERRED\u SIZE、javax.swing.GroupLayout.DEFAULT\u SIZE、javax.swing.GroupLayout.PREFERRED\u SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT\u SIZE,Short.MAX\u VALUE))
);
包装();
}//
专用void打印光栅(int[][]光栅){
int rows=光栅长度;
int cols=光栅[0]。长度;
对于(int r=0;r