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package bezier.transforms.geom;
import bezier.geom.TDHPoint;
/**
* A transform that does coordinate translation.
*
* @author bjculkin
*
*/
public class TDHTranslate implements TDHTransform {
/**
* The amount to translate the x-coordinate by.
*/
public final double h;
/**
* The amount to translate the y-coordinate by.
*/
public final double k;
/**
* Create a new translation transform.
*
* @param h
* The amount to translate x by.
* @param k
* The amount to translate y by.
*/
public TDHTranslate(double h, double k) {
this.h = h;
this.k = k;
}
@Override
public TDHTransformType type() {
return TDHTransformType.TRANSLATE;
}
@Override
public TDHPoint transform(TDHPoint punkt) {
double x = punkt.x + (punkt.z * h);
double y = punkt.y + (punkt.z * k);
return new TDHPoint(x, y, punkt.z);
}
@Override
public double[][] matrix() {
return new double[][] { new double[] { 1, 0, 0 }, new double[] { 0, 1, 0 }, new double[] { h, k, 1 } };
}
@Override
public TDHTransform invert() {
return new TDHTranslate(-h, -k);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
long temp;
temp = Double.doubleToLongBits(h);
result = prime * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(k);
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;
TDHTranslate other = (TDHTranslate) obj;
if (Double.doubleToLongBits(h) != Double.doubleToLongBits(other.h))
return false;
if (Double.doubleToLongBits(k) != Double.doubleToLongBits(other.k))
return false;
return true;
}
@Override
public String toString() {
return "TDHTranslate [h=" + h + ", k=" + k + "]";
}
}
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