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package bezier.geom.transform;
import bezier.geom.TDHPoint;
/**
* Transform that does coordinate scaling.
*
* @author bjculkin
*
*/
public class TDHScale implements TDHTransform {
/**
* Amount to scale x by.
*/
public final double sx;
/**
* Amount to scale y by.
*/
public final double sy;
/**
* Amount to scale the homogeneous coordinate by.
*/
public final double sz;
/**
* Create a new scaling that scales each coordinate by an equal amount
*
* @param factor
* The amount to scale the coordinates by.
*/
public TDHScale(double factor) {
this(factor, factor);
}
/**
* Create a new scaling that scales each coordinate separately.
*
* @param sx
* The amount to scale x by.
* @param sy
* The amount to scale y by.
*/
public TDHScale(double sx, double sy) {
this(sx, sy, 1);
}
/**
* Create a new scaling that scales each coordinate separately.
*
* Includes the homogeneous coordinate.
*
* @param sx
* The amount to scale x by.
* @param sy
* The amount to scale y by.
* @param sz
* The amount to scale the homogeneous coordinate by.
*/
public TDHScale(double sx, double sy, double sz) {
this.sx = sx;
this.sy = sy;
this.sz = sz;
}
@Override
public TDHTransformType type() {
return TDHTransformType.SCALE;
}
@Override
public TDHPoint transform(TDHPoint punkt) {
double x = punkt.x * sx;
double y = punkt.y * sy;
double z = punkt.z * sz;
return new TDHPoint(x, y, z);
}
@Override
public double[][] matrix() {
return new double[][] { new double[] { sx, 0, 0 }, new double[] { 0, sy, 0 }, new double[] { 0, 0, sz } };
}
@Override
public TDHTransform invert() {
return new TDHScale(1 / sx, 1 / sy, 1 / sy);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
long temp;
temp = Double.doubleToLongBits(sx);
result = prime * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(sy);
result = prime * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(sz);
result = prime * result + (int) (temp ^ (temp >>> 32));
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
TDHScale other = (TDHScale) obj;
if (Double.doubleToLongBits(sx) != Double.doubleToLongBits(other.sx))
return false;
if (Double.doubleToLongBits(sy) != Double.doubleToLongBits(other.sy))
return false;
if (Double.doubleToLongBits(sz) != Double.doubleToLongBits(other.sz))
return false;
return true;
}
@Override
public String toString() {
return "TDHScale [sx=" + sx + ", sy=" + sy + ", sz=" + sz + "]";
}
}
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