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java代码写透视变换 java透视图

IT技术pan

利用java实现图片翻转的代码重载渲染控件的paintComponent(Graphics
g)方法.
设你当前图像实例为img,已初始化,需要旋转的角度为ang
public
void
paintComponent(Graphics
g){
super.paintCompoent(g);
Graphics2D
g2d
=
(Graphics2D)g;
g2d.rotate(-angle);
g2d.drawImage(img,0,0,this.getWidth(),this.getHeight(),null);
}
Graphics,Graphics2D
类中有对当前描绘环境进行仿射变换的方法,包括translate,scale,rotate,也可以直接设置仿射变换矩阵,利用这点就可以根据所需要的实现方式来进行描绘.
Java代码怎么实现图像采样距离变换算法算法是别人提出来的，感兴趣可以搜索《Distance Transforms of Sampled Functions》这篇论文，网上也有很多实现的代码 ， 但是结构不是很好，而且很分散不是一个完整的算法 。所以我整理了一下 ， 写成一个单独的类，只要简单调用一下即可出结果图片 。至于算法原理什么的，我真很难解释清楚 ， 大致的思想是基于能量最小化的，分别进行行与列的1D距离变变换采样 。
package com.gloomyfish.image.transform;
import java.awt.image.BufferedImage;
import com.gloomyfish.filter.study.GrayFilter;
/**
*
* @author gloomyfish
*
*/
public class FastDistanceTransformAlg extends GrayFilter {
public final static double INF = 1E20;
private int backgroundColor = 0; // default black
public int getBackgroundColor() {
return backgroundColor;
}
public void setBackgroundColor(int backgroundColor) {
this.backgroundColor = backgroundColor;
}
@Override
public BufferedImage filter(BufferedImage src, BufferedImage dest) {
int width = src.getWidth();
int height = src.getHeight();
dest = super.filter(src, null);
//
int[] inPixels = new int[width*height];
float[] outPixels = new float[width*height];
getRGB( dest, 0, 0, width, height, inPixels );
int index = 0;
for(int row=0; rowheight; row) {
int tr = 0;
for(int col=0; colwidth; col) {
index = row * widthcol;
tr = (inPixels[index]16)0xff;
if(tr == backgroundColor)
outPixels[index] = (float)INF;
else
outPixels[index] = 0;
}
}
// transform along columns
float[] f = new float[Math.max(width, height)];
for(int col=0; colwidth; col) {
for(int row=0; rowheight; row) {
index = row * widthcol;
f[row] = outPixels[index];
}
float[] disColumns = distance1DTransform(f, height);
for(int row=0; rowheight; row) {
index = row * widthcol;
outPixels[index] = disColumns[row];
}
}
// transform along rows
for (int row = 0; rowheight; row) {
for (int col = 0; colwidth; col) {
index = row * widthcol;
f[col] = outPixels[index];
}
float[] disColumns = distance1DTransform(f, width);
for (int col = 0; colwidth; col) {
index = row * widthcol;
outPixels[index] = disColumns[col];
}
}
// post sqrt calculation
int[] result = new int[width*height];
for(int row=0; rowheight; row) {
for(int col=0; colwidth; col) {
index = row * widthcol;
int pc = clamp(Math.sqrt(outPixels[index]));
result[index] = (25524) | (pc16) | (pc8) | pc;
}
}
setRGB( dest, 0, 0, width, height, result );
return dest;
}
public static int clamp(double c)
{
return c255 ? 255 : (c0 ? 0 : (int)c);
}
/**
* 1D distance transform using squared distance
*
* @param data
* @param n
* @return
*/
private float[] distance1DTransform(float[] f, int n)
{
float[] d = new float[n];
int[] v = new int[n];
double[] z = new double[n 1];
int k = 0;
v[0] = 0;
z[0] = -INF;
z[1] =INF;
for (int q = 1; q = n-1; q) {
double s= ((f[q] square(q))-(f[v[k]] square(v[k])))/(2*q-2*v[k]);
while (s = z[k]) {
k--;
s= ((f[q] square(q))-(f[v[k]] square(v[k])))/(2*q-2*v[k]);
}
k;
v[k] = q;
z[k] = s;
z[k 1] =INF;
}
k = 0;
for (int q = 0; q = n-1; q) {
while (z[k 1]q)
k;
d[q] = (float)square(q-v[k])f[v[k]];
}
return d;
}
private double square(double v)
{
return v*v;
}
}
java swing 的jPanel背景颜色能否设置为透明,代码怎么写设置颜色：
把pan - pan6的Background设为Null，这样他们就变为透明的了，以后只需要改变inquestFrame的颜色就可以改变全部的颜色 ， 代码如下：
// 设置整体布局
JPanel pan = new JPanel();
pan.setLayout(new GridLayout(6, 1));
pan.add(pan1);
pan.add(pan2);
pan.add(pan3);
pan.add(pan4);
pan.add(pan5);
pan.add(pan6);
pan.setBackground(null);
pan1.setBackground(null);
pan2.setBackground(null);
pan3.setBackground(null);
pan4.setBackground(null);
pan5.setBackground(null);
pan6.setBackground(null);
r1.setBackground(null);
r2.setBackground(null);
inquestFrame.setBackground(Color.LIGHT_GRAY);
inquestFrame.setContentPane(pan);
inquestFrame.setSize(300, 250);
inquestFrame.setVisible(true);
设置图片需要改的比较多 ， 自己比较那不一样吧：
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
public class Inquest {
JFrame inquestFrame;
JLabel lab1, lab2, lab3, lab4, lab5, lab6;
JTextField text1, text2, text4, text5, text6;
JRadioButton r1, r2;
JButton inqButton;
public Inquest() {
inquestFrame = new JFrame("教育经历管理系统-查询窗口");
MyPanel pan1 = new MyPanel();
lab1 = new JLabel("请输入编码:");
text1 = new JTextField(10);
inqButton = new JButton(" 查询");
inqButton.addActionListener(new ButtonHandler());
pan1.add(lab1);
pan1.add(text1);
pan1.add(inqButton);
MyPanel pan2 = new MyPanel();
lab2 = new JLabel("姓名:");
text2 = new JTextField(10);
pan2.add(lab2);
【java代码写透视变换 java透视图】pan2.add(text2);
MyPanel pan3 = new MyPanel();
lab3 = new JLabel("性别:");
r1 = new JRadioButton("男");
r2 = new JRadioButton("女");
// 把两个单选按钮放到一个群组中，保持二选一
ButtonGroup group = new ButtonGroup();
group.add(r1);
group.add(r2);
pan3.add(lab3);
pan3.add(r1);
pan3.add(r2);
MyPanel pan4 = new MyPanel();
lab4 = new JLabel("单位:");
text4 = new JTextField(10);
pan4.add(lab4);
pan4.add(text4);
MyPanel pan5 = new MyPanel();
lab5 = new JLabel("职位:");
text5 = new JTextField(10);
pan5.add(lab5);
pan5.add(text5);
MyPanel pan6 = new MyPanel();
lab6 = new JLabel("年龄:");
text6 = new JTextField(10);
pan6.add(lab6);
pan6.add(text6);
// 设置整体布局
MyPanel pan = new MyPanel();
pan.setLayout(new GridLayout(6, 1));
pan.add(pan1);
pan.add(pan2);
pan.add(pan3);
pan.add(pan4);
pan.add(pan5);
pan.add(pan6);
pan.setBackground(null);
pan1.setBackground(null);
pan2.setBackground(null);
pan3.setBackground(null);
pan4.setBackground(null);
pan5.setBackground(null);
pan6.setBackground(null);
r1.setBackground(null);
r2.setBackground(null);
MyPanel pan0 = new MyPanel();
pan0.setPreferredSize(pan.getPreferredSize());
pan0.setLayout(null);
pan.setBounds(0, 0, pan.getPreferredSize().width, pan.getPreferredSize().height);
URL url = Inquest.class.getResource("Winter.jpg");
ImageIcon img = new ImageIcon(url);
JLabel lab = new JLabel(img);
lab.setBounds(0, 0, img.getIconWidth(), img.getIconHeight());
pan0.add(pan);
pan0.add(lab);
inquestFrame.setContentPane(pan0);
inquestFrame.pack();
inquestFrame.setVisible(true);
}
public static class MyPanel extends JPanel {
public void paint(Graphics g) {
paintChildren(g);
}
}
public void setBack() {
((JPanel) inquestFrame.getContentPane()).setOpaque(false);
// Winter.jpg这个图片的位置要跟当前这个类是同一个包下
URL url = Inquest.class.getResource("Winter.jpg");
ImageIcon img = new ImageIcon(url);
JLabel background = new JLabel(img);
inquestFrame.getLayeredPane().add(background, new Integer(Integer.MIN_VALUE));
background.setBounds(0, 0, img.getIconWidth(), img.getIconHeight());
}
class ButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent e) {
// 生成SQL语句
String s = "select * from information where id=""'"text1.getText()"'";
String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
String url = "jdbc:odbc:test";
// DB db = new DB(driver, url, "sa", "");
// ResultSet rs = db.query(s);
// try {
// while (rs.next()) {
// text2.setText(rs.getString(2));
// String sex = rs.getString(3);
// if (sex.trim().equals("男"))
// r1.setSelected(true);
// else
// r2.setSelected(true);
//
// text4.setText(rs.getString(4));
// text5.setText(rs.getString(5));
// text6.setText(rs.getString(6));
// }
// } catch (Exception e2) {
// e2.printStackTrace();
// }
}
}
public static void main(String args[]) {
new Inquest();
}
}
java代码写透视变换的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java透视图、java代码写透视变换的信息别忘了在本站进行查找喔 。

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