将 BufferedImage 设置为 Java 中的一种颜色
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Set BufferedImage to be a color in Java
提问by Lily
I need to create a rectangular BufferedImagewith a specified background color, draw some pattern on the background and save it to file. I don't know how to create the background.
我需要创建一个BufferedImage具有指定背景颜色的矩形，在背景上绘制一些图案并将其保存到文件中。我不知道如何创建背景。
I am using a nested loop:
我正在使用嵌套循环：
BufferedImage b_img = ...
for every row
for every column
setRGB(r,g,b);
But it's very slow when the image is large.
但是当图像很大时它很慢。
How to set the color in a more efficient way?
如何以更有效的方式设置颜色？
采纳答案by Pete Kirkham
Get the graphics object for the image, set the current paint to the desired colour, then call fillRect(0,0,width,height).
获取图像的图形对象，将当前绘制设置为所需的颜色，然后调用fillRect(0,0,width,height).
BufferedImage b_img = ...
Graphics2D graphics = b_img.createGraphics();
graphics.setPaint ( new Color ( r, g, b ) );
graphics.fillRect ( 0, 0, b_img.getWidth(), b_img.getHeight() );
回答by camickr
Probably something like:
大概是这样的：
BufferedImage image = new BufferedImage(...);
Graphics2D g2d = image.createGraphics();
g2d.setColor(...);
g2d.fillRect(...);
回答by Aaaaaaaa
Use this:
用这个：
BufferedImage bi = new BufferedImage(width, height,
BufferedImage.TYPE_INT_ARGB);
Graphics2D ig2 = bi.createGraphics();
ig2.setBackground(Color.WHITE);
ig2.clearRect(0, 0, width, height);
回答by hoford
BufferedImage image = new BufferedImage(width,height, BufferedImage.TYPE_INT_ARGB);
int[]data=((DataBufferInt) image.getRaster().getDataBuffer()).getData();
Arrays.fill(data,color.getRGB());
回答by Juan Franco
For who want also to save the created image to a file, I have used previous answers and added the file saving part:
对于谁还想将创建的图像保存到文件中，我使用了以前的答案并添加了文件保存部分：
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
// Create the image
BufferedImage bi = new BufferedImage(80, 40, ColorSpace.TYPE_RGB);
Graphics2D graphics = bi.createGraphics();
// Fill the background with gray color
Color rgb = new Color(50, 50, 50);
graphics.setColor (rgb);
graphics.fillRect ( 0, 0, bi.getWidth(), bi.getHeight());
// Save the file in PNG format
File outFile = new File("output.png");
ImageIO.write(bi, "png", outFile);
You can also save the image in other formats like bmp, jpg, etc...
您还可以将图像保存为其他格式，如 bmp、jpg 等...
