private void assembleOperation(IMOperation op, Parameters params, Dimension fullSize) {
// region transformation
Region region = params.getRegion();
if (!region.isFull()) {
if (region.isPercent()) {
// im4java doesn't support cropping x/y by percentage (only
// width/height), so we have to calculate them.
int x = Math.round(region.getX() / 100.0f * fullSize.width);
int y = Math.round(region.getY() / 100.0f * fullSize.height);
int width = Math.round(region.getWidth());
int height = Math.round(region.getHeight());
op.crop(width, height, x, y, "%");
} else {
op.crop(
Math.round(region.getWidth()), Math.round(region.getHeight()),
Math.round(region.getX()), Math.round(region.getY()));
}
}
// size transformation
Size size = params.getSize();
if (size.getScaleMode() != Size.ScaleMode.FULL) {
if (size.getScaleMode() == Size.ScaleMode.ASPECT_FIT_WIDTH) {
op.resize(size.getWidth());
} else if (size.getScaleMode() == Size.ScaleMode.ASPECT_FIT_HEIGHT) {
op.resize(null, size.getHeight());
} else if (size.getScaleMode() == Size.ScaleMode.NON_ASPECT_FILL) {
op.resize(size.getWidth(), size.getHeight(), "!".charAt(0));
} else if (size.getScaleMode() == Size.ScaleMode.ASPECT_FIT_INSIDE) {
op.resize(size.getWidth(), size.getHeight());
} else if (size.getPercent() != null) {
op.resize(Math.round(size.getPercent()), Math.round(size.getPercent()), "%".charAt(0));
}
}
// rotation transformation
Rotation rotation = params.getRotation();
if (rotation.shouldMirror()) {
op.flop();
}
if (rotation.getDegrees() != 0) {
op.rotate(rotation.getDegrees().doubleValue());
}
// quality transformation
Quality quality = params.getQuality();
if (quality != Quality.COLOR && quality != Quality.DEFAULT) {
switch (quality) {
case GRAY:
op.colorspace("Gray");
break;
case BITONAL:
op.monochrome();
break;
}
}
}
/**
* 根据尺寸缩放图片
*
* @param angle 旋转过图片的角度
* @param srcPath 源图片路径
* @param newPath 缩放后图片的路径
*/
public static void rotateImage(String srcPath, String newPath, Double angle)
throws InterruptedException, IOException, IM4JavaException {
IMOperation op = new IMOperation();
op.addImage(srcPath);
op.rotate(angle);
op.addImage(newPath);
// linux下不要设置此值，不然会报错
if (isWin) {
convertCmd.setSearchPath(imageMagickPath);
}
convertCmd.run(op);
}