Question

我正在研究这段代码，但我正在努力弄清楚如何在targetPicture1（背景）中更改图像的坐标，在本例中是地球的图片。

import java.awt.*;
public class CopyCatDemo
{
 public static void main(String[] args)
 {
    Picture sourcePicture = new Picture("earth.jpg");
    System.out.println("Width: " + sourcePicture.getWidth());
    System.out.println("Height: " + sourcePicture.getHeight());
    Picture targetPicture1 = new Picture(400,400);
    targetPicture1.setAllPixelsToAColor(Color.BLACK);

    Pixel sourcePixel, targetPixel = null;
    Color sourceColor, targetColor = null;

    for(int y = 0; y < sourcePicture.getHeight(); y++)
    {
        for(int x = 0; x < sourcePicture.getWidth(); x++)
        {
            sourcePixel = sourcePicture.getPixel(x,y);
            sourceColor = sourcePixel.getColor();
            targetPixel = targetPicture1.getPixel(x,y);
            targetPixel.setColor(sourceColor);         
        }
    }

    sourcePicture.show();
    targetPicture1.show();
    targetPicture1.write("NewFile.jpg");
 }//end of main method
}//end of class

Answer 1

我建议你使用偏移量。通过这种方式，您可以决定复制图像时图像的位置。

尝试类似：

import java.awt.*;
public class CopyCatDemo
{
 public static void main(String[] args)
 {
    Picture sourcePicture = new Picture("earth.jpg");
    System.out.println("Width: " + sourcePicture.getWidth());
    System.out.println("Height: " + sourcePicture.getHeight());
    Picture targetPicture1 = new Picture(400,400);
    targetPicture1.setAllPixelsToAColor(Color.BLACK);

    int offsetX = 0;
    int offsetY = 0;

    Pixel sourcePixel, targetPixel = null;
    Color sourceColor, targetColor = null;

    for(int y = 0; y < sourcePicture.getHeight(); y++)
    {
        for(int x = 0; x < sourcePicture.getWidth(); x++)
        {
            sourcePixel = sourcePicture.getPixel(x,y);
            sourceColor = sourcePixel.getColor();
            targetPixel = targetPicture1.getPixel(offsetX + x, offsetY + y);
            targetPixel.setColor(sourceColor);         
        }
    }

    sourcePicture.show();
    targetPicture1.show();
    targetPicture1.write("NewFile.jpg");
 }//end of main method
}//end of class

然后假设您希望图像位于屏幕的右下角。只需相应地设置偏移量：

int offsetX = 400 - sourcePicture.getWidth();
int offsetY = 400 - sourcePicture.getHeight();

然后图像将开始被绘制其宽度远离屏幕右下角的高度。

Answer 2

回答@Ben Rocco的第二个问题：

我还有另一个问题，如果你的回答会很好，我怎么会把图像切成两半，就像北半球只有地球一样？

您需要更改java循环的起点。让我们只打印照片的下半部分：

import java.awt.*;
public class CopyCatDemo
{
 public static void main(String[] args)
 {
    Picture sourcePicture = new Picture("earth.jpg");
    System.out.println("Width: " + sourcePicture.getWidth());
    System.out.println("Height: " + sourcePicture.getHeight());
    Picture targetPicture1 = new Picture(400,400);
    targetPicture1.setAllPixelsToAColor(Color.BLACK);

    int offsetX = 0;
    int offsetY = 0;

    Pixel sourcePixel, targetPixel = null;
    Color sourceColor, targetColor = null;

    for(int y = sourcePicture.getHeight()/2; y < sourcePicture.getHeight(); y++)
    {
        for(int x = 0; x < sourcePicture.getWidth(); x++)
        {
            sourcePixel = sourcePicture.getPixel(x,y);
            sourceColor = sourcePixel.getColor();
            targetPixel = targetPicture1.getPixel(offsetX + x, offsetY + y);
            targetPixel.setColor(sourceColor);         
        }
    }

    sourcePicture.show();
    targetPicture1.show();
    targetPicture1.write("NewFile.jpg");
 }//end of main method
}//end of class

然后我们需要更改Y的偏移量：

int offsetX = 400 - sourcePicture.getWidth();
int offsetY = 400 - sourcePicture.getHeight()/2;

多田！

在背景Java中更改图像的坐标

2 个答案: