From dcb6c2159446135a142cad41eec185bb24c45bfb Mon Sep 17 00:00:00 2001
From: bjculkin <bjculkin@BECK-DZ9BJB2.wvu-ad.wvu.edu>
Date: Wed, 11 Apr 2018 15:29:25 -0400
Subject: Split #9 into one class/file

---
 CSMath/src/bezier/transforms/TDHScale.java | 124 +++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 CSMath/src/bezier/transforms/TDHScale.java

(limited to 'CSMath/src/bezier/transforms/TDHScale.java')

diff --git a/CSMath/src/bezier/transforms/TDHScale.java b/CSMath/src/bezier/transforms/TDHScale.java
new file mode 100644
index 0000000..09ab237
--- /dev/null
+++ b/CSMath/src/bezier/transforms/TDHScale.java
@@ -0,0 +1,124 @@
+package bezier.transforms;
+
+import bezier.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 } };
+	}
+
+	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 + "]";
+	}
+}
\ No newline at end of file
-- 
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