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/*
Copyright 2006 Jerry Huxtable
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.jhlabs.image;
import java.awt.*;
import java.awt.image.*;
public class RotateFilter extends TransformFilter {
static final long serialVersionUID = 1166374736665848180L;
private float angle;
private float cos, sin;
private boolean resize = true;
public RotateFilter() {
this(ImageMath.PI);
}
public RotateFilter(float angle) {
this(angle, true);
}
public RotateFilter(float angle, boolean resize) {
setAngle(angle);
this.resize = resize;
}
public void setAngle(float angle) {
this.angle = angle;
cos = (float)Math.cos(this.angle);
sin = (float)Math.sin(this.angle);
}
public float getAngle() {
return angle;
}
protected void transformSpace(Rectangle rect) {
if (resize) {
Point out = new Point(0, 0);
int minx = Integer.MAX_VALUE;
int miny = Integer.MAX_VALUE;
int maxx = Integer.MIN_VALUE;
int maxy = Integer.MIN_VALUE;
int w = rect.width;
int h = rect.height;
int x = rect.x;
int y = rect.y;
for (int i = 0; i < 4; i++) {
switch (i) {
case 0: transform(x, y, out); break;
case 1: transform(x + w, y, out); break;
case 2: transform(x, y + h, out); break;
case 3: transform(x + w, y + h, out); break;
}
minx = Math.min(minx, out.x);
miny = Math.min(miny, out.y);
maxx = Math.max(maxx, out.x);
maxy = Math.max(maxy, out.y);
}
rect.x = minx;
rect.y = miny;
rect.width = maxx - rect.x;
rect.height = maxy - rect.y;
}
}
protected void transform(int x, int y, Point out) {
out.x = (int)((x * cos) + (y * sin));
out.y = (int)((y * cos) - (x * sin));
}
protected void transformInverse(int x, int y, float[] out) {
out[0] = (x * cos) - (y * sin);
out[1] = (y * cos) + (x * sin);
}
public String toString() {
return "Rotate "+(int)(angle * 180 / Math.PI);
}
}
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