Java Can';t按比例将BuffereImage绘制到另一个BuffereImage中
请告知 我正在尝试将输入BuffereImage绘制成更大的输出BuffereImage(带有缩放)。请查看以下代码:Java Can';t按比例将BuffereImage绘制到另一个BuffereImage中,java,awt,Java,Awt,请告知 我正在尝试将输入BuffereImage绘制成更大的输出BuffereImage(带有缩放)。请查看以下代码: public class Main { public void print(BufferedImage img, int width, int height) { for (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) {
public class Main {
public void print(BufferedImage img, int width, int height) {
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
System.out.print(img.getRGB(x, y) + " ");
}
System.out.println("");
}
}
public static void main(String[] args) {
Main app = new Main();
// create input image
int inputWidth = 2;
int inputHeight = 2;
BufferedImage inputImg = new BufferedImage(inputWidth, inputHeight, BufferedImage.TYPE_INT_ARGB);
// fill input image
for (int y = 0; y < inputHeight; y++) {
for (int x = 0; x < inputWidth; x++) {
inputImg.setRGB(x, y, y * inputWidth * (1 << 16) + x);
}
}
// print
app.print(inputImg, inputWidth, inputHeight);
// create output image
int outputWidth = 4;
int outputHeight = 4;
BufferedImage outputImg = new BufferedImage(outputWidth, outputHeight, BufferedImage.TYPE_INT_ARGB);
// draw inputImg into outputImg
Graphics2D g = outputImg.createGraphics();
g.drawImage(inputImg, 0, 0, outputImg.getWidth(), outputImg.getHeight(), 0, 0, inputImg.getWidth(), inputImg.getHeight(), null);
// print
app.print(outputImg, outputImg.getWidth(), outputImg.getHeight());
}
}
似乎Graphics2D对象可以工作,因为我可以画一条调用drawLine函数的线。所以,我认为输入是问题的根源,但我不知道出了什么问题
更新:
我曾尝试使用仿射变换
,但不幸的是,它没有帮助
Graphics2D g = outputImg.createGraphics();
AffineTransform at = new AffineTransform();
at.setToIdentity();
at.scale(2, 2);
g.drawImage(inputImg, at, null);
对我来说,这似乎是你正在使用的颜色计算的一个问题 当我改变
inputImg.setRGB(x, y, y * inputWidth * (1 << 16) + x);
你的产生
-16777216 -16777215
-16646144 -16646143
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坦率地说,这就是为什么我不做这种计算的原因,不是在有API可以帮我做的时候——但我是个哑巴;P
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
public class Main {
public void print(BufferedImage img, int width, int height) {
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
System.out.print(img.getRGB(x, y) + " ");
}
System.out.println("");
}
}
public static void main(String[] args) {
Main app = new Main();
// create input image
int inputWidth = 2;
int inputHeight = 2;
BufferedImage inputImg = new BufferedImage(inputWidth, inputHeight, BufferedImage.TYPE_INT_ARGB);
// fill input image
System.out.println(inputWidth + "x" + inputHeight);
Color color = Color.RED;
for (int y = 0; y < inputHeight; y++) {
for (int x = 0; x < inputWidth; x++) {
int rgb = y * inputWidth * (1 << 16) + x;
inputImg.setRGB(x, y, new Color(rgb).getRGB());
}
}
JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(inputImg)));
// print
app.print(inputImg, inputWidth, inputHeight);
// create output image
int outputWidth = 4;
int outputHeight = 4;
BufferedImage outputImg = new BufferedImage(outputWidth, outputHeight, BufferedImage.TYPE_INT_ARGB);
// draw inputImg into outputImg
Graphics2D g = outputImg.createGraphics();
g.drawImage(inputImg, 0, 0, outputImg.getWidth(), outputImg.getHeight(), 0, 0, inputImg.getWidth(), inputImg.getHeight(), null);
g.dispose();
JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(outputImg)));
// print
app.print(outputImg, outputImg.getWidth(), outputImg.getHeight());
}
}
导入java.awt.Color;
导入java.awt.Graphics2D;
导入java.awt.image.buffereImage;
导入javax.swing.ImageIcon;
导入javax.swing.JLabel;
导入javax.swing.JOptionPane;
公共班机{
公共空白打印(缓冲图像img、整数宽度、整数高度){
对于(int y=0;y int rgb=y*输入宽度*(1)你必须手动缩放图像吗?Graphcs2D
有AffineTransform
可以执行缩放操作文档说这个版本的drawImage应该动态缩放输入图像是的,那很好,你为什么不能使用AffineTransform
?@MadProgrammer我试图使用drawImage
v接受AffineTransform
的版本,但不幸的是,它没有帮助。我将您的颜色算法替换为color.RED.getRGB()
,它会生成一个结果-请原谅我对颜色数学的理解毫无用处,但是BuffereImage
需要一个RGBA值-我会确保alpha值包含在您的计算中
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import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
public class Main {
public void print(BufferedImage img, int width, int height) {
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
System.out.print(img.getRGB(x, y) + " ");
}
System.out.println("");
}
}
public static void main(String[] args) {
Main app = new Main();
// create input image
int inputWidth = 2;
int inputHeight = 2;
BufferedImage inputImg = new BufferedImage(inputWidth, inputHeight, BufferedImage.TYPE_INT_ARGB);
// fill input image
System.out.println(inputWidth + "x" + inputHeight);
Color color = Color.RED;
for (int y = 0; y < inputHeight; y++) {
for (int x = 0; x < inputWidth; x++) {
int rgb = y * inputWidth * (1 << 16) + x;
inputImg.setRGB(x, y, new Color(rgb).getRGB());
}
}
JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(inputImg)));
// print
app.print(inputImg, inputWidth, inputHeight);
// create output image
int outputWidth = 4;
int outputHeight = 4;
BufferedImage outputImg = new BufferedImage(outputWidth, outputHeight, BufferedImage.TYPE_INT_ARGB);
// draw inputImg into outputImg
Graphics2D g = outputImg.createGraphics();
g.drawImage(inputImg, 0, 0, outputImg.getWidth(), outputImg.getHeight(), 0, 0, inputImg.getWidth(), inputImg.getHeight(), null);
g.dispose();
JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(outputImg)));
// print
app.print(outputImg, outputImg.getWidth(), outputImg.getHeight());
}
}