如何绘制一个矩形用java现有的PNG图像

Question

我已经为png其保存在本地PC图像。我想打开（负载）这个图像并且该图像@用java指定的位置（X，Y，宽度，高度）上绘制一个矩形。任何人可以帮助我做到这一点？

当量C＃代码如下。我想一个Java版本相同

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Image oriImage = // load from file
Rectangle rect = new Rectangle(0, 1824, 1080, 96);
Bitmap eleImg = new Bitmap(oriImage, (int)(oriImage.Width / rate), (int)(oriImage.Height / rate));

Graphics g = Graphics.FromImage(eleImg);
g.DrawRectangle(new Pen(Color.Red, 5), rect);

Answer 1

您使用的2D图形API

BufferedImage img = ImageIO.read(...);
Graphics2D g2d = img.createGraphics();
g2d.setColor(Color.RED);
g2d.drawRect(0, 0, 100, 100);
g2d.dispose();

看一眼

• Reading/Loading an Image
• 2D Graphics

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