level 9
ghtjkl
楼主
现在图片旋转有2个方法
但都有点问题 大神们帮我看看
代码1 这个旋转之后两边有黑色填充的。。。
BufferedImage sour = toBufferedImage(image);
int width = sour.getWidth();
int height = sour.getHeight();
BufferedImage dstImag = new BufferedImage(width,height, sour.getType());
Graphics2D tmpG = (Graphics2D)dstImag.getGraphics();
tmpG.translate(width/2, height/2);
tmpG.setBackground(Color.WHITE);
tmpG.rotate(angle*Math.PI/180);
tmpG.translate(-width/2, -height/2);
tmpG.drawImage(sour, 0, 0, width, height, 0, 0, width, height, null);
return dstImag;
代码2 这个只要是90度的倍数就没问题 但是其他的度数就也有黑色填充,而且越转图片越小。。。
int src_width = image.getWidth(null);
// int src_height = image.getHeight(null);
// // calculate the new image size
// Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(
// src_width, src_height)), (int)angle);
//
// BufferedImage res = null;
// res = new BufferedImage(rect_des.width, rect_des.height,
// BufferedImage.TYPE_INT_RGB);
// Graphics2D g2 = res.createGraphics();
// // transform
// g2.translate((rect_des.width - src_width) / 2,
// (rect_des.height - src_height) / 2);
// g2.rotate(Math.toRadians(angle), src_width / 2, src_height / 2);
//
// g2.drawImage(image, null, null);
// return res;
public static Rectangle CalcRotatedSize(Rectangle src, int angel) {
// if angel is greater than 90 degree, we need to do some conversion
if (angel >= 90) {
if(angel / 90 % 2 == 1){
int temp = src.height;
src.height = src.width;
src.width = temp;
}
angel = angel % 90;
}
double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
double angel_dalta_width = Math.atan((double) src.height / src.width);
double angel_dalta_height = Math.atan((double) src.width / src.height);
int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
- angel_dalta_width));
int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
- angel_dalta_height));
int des_width = src.width + len_dalta_width * 2;
int des_height = src.height + len_dalta_height * 2;
return new java.awt.Rectangle(new Dimension(des_width, des_height));
}
@windsun_ul @那十无忧
2012年11月28日 08点11分
1
但都有点问题 大神们帮我看看
代码1 这个旋转之后两边有黑色填充的。。。
BufferedImage sour = toBufferedImage(image);
int width = sour.getWidth();
int height = sour.getHeight();
BufferedImage dstImag = new BufferedImage(width,height, sour.getType());
Graphics2D tmpG = (Graphics2D)dstImag.getGraphics();
tmpG.translate(width/2, height/2);
tmpG.setBackground(Color.WHITE);
tmpG.rotate(angle*Math.PI/180);
tmpG.translate(-width/2, -height/2);
tmpG.drawImage(sour, 0, 0, width, height, 0, 0, width, height, null);
return dstImag;
代码2 这个只要是90度的倍数就没问题 但是其他的度数就也有黑色填充,而且越转图片越小。。。
int src_width = image.getWidth(null);
// int src_height = image.getHeight(null);
// // calculate the new image size
// Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(
// src_width, src_height)), (int)angle);
//
// BufferedImage res = null;
// res = new BufferedImage(rect_des.width, rect_des.height,
// BufferedImage.TYPE_INT_RGB);
// Graphics2D g2 = res.createGraphics();
// // transform
// g2.translate((rect_des.width - src_width) / 2,
// (rect_des.height - src_height) / 2);
// g2.rotate(Math.toRadians(angle), src_width / 2, src_height / 2);
//
// g2.drawImage(image, null, null);
// return res;
public static Rectangle CalcRotatedSize(Rectangle src, int angel) {
// if angel is greater than 90 degree, we need to do some conversion
if (angel >= 90) {
if(angel / 90 % 2 == 1){
int temp = src.height;
src.height = src.width;
src.width = temp;
}
angel = angel % 90;
}
double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
double angel_dalta_width = Math.atan((double) src.height / src.width);
double angel_dalta_height = Math.atan((double) src.width / src.height);
int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
- angel_dalta_width));
int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
- angel_dalta_height));
int des_width = src.width + len_dalta_width * 2;
int des_height = src.height + len_dalta_height * 2;
return new java.awt.Rectangle(new Dimension(des_width, des_height));
}
@windsun_ul @那十无忧