graphics2d图片旋转后出现黑边

2019-05-08 17:53:38

graphics2d图片旋转后出现黑边,问题找到了

  1. 首先设置背景为透明色


        

res = g2.getDeviceConfiguration().createCompatibleImage(rect_des., rect_des., Transparency.);
        g2.dispose();
        g2 = res.createGraphics();


2.如果是输出图片,一定要输出png格式,这个就不讲了

    

// 生成图片
   ImageIO.write(res, "PNG", os);


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