3 files changed, 38 insertions, 0 deletions
diff --git a/core/src/main/java/coffee/liz/ecs/math/Vec2.java b/core/src/main/java/coffee/liz/ecs/math/Vec2.java
index ec7e531..7620395 100644
--- a/core/src/main/java/coffee/liz/ecs/math/Vec2.java
+++ b/core/src/main/java/coffee/liz/ecs/math/Vec2.java
@@ -1,5 +1,7 @@
 package coffee.liz.ecs.math;
 
+import java.util.function.Function;
+
 /**
  * Cartesian vectors.
  *
@@ -47,6 +49,17 @@ public interface Vec2<T> {
 	Vec2<T> scale(final T scaleX, final T scaleY);
 
 	/**
+	 * Scales this vector by the given vector.
+	 *
+	 * @param scale
+	 *            scale vec.
+	 * @return a new scaled vector
+	 */
+	default Vec2<T> scale(final Vec2<T> scale) {
+		return scale(scale.getX(), scale.getY());
+	}
+
+	/**
 	 * Length of the vector.
 	 *
 	 * @return length.
@@ -62,4 +75,14 @@ public interface Vec2<T> {
 	 * @return Vec2<Float> components of {@link Vec2<T>}
 	 */
 	Vec2<Float> floatValue();
+
+	/**
+	 * @param xTransform
+	 *            transform of x component.
+	 * @param yTransform
+	 *            transform of y component.
+	 * @return transformed vec applying {@param xTransform} to x component,
+	 *         {@param yTransform} to y component.
+	 */
+	Vec2<T> transform(final Function<T, T> xTransform, final Function<T, T> yTransform);
 }
diff --git a/core/src/main/java/coffee/liz/ecs/math/Vec2f.java b/core/src/main/java/coffee/liz/ecs/math/Vec2f.java
index 46f3fb8..5b91a2d 100644
--- a/core/src/main/java/coffee/liz/ecs/math/Vec2f.java
+++ b/core/src/main/java/coffee/liz/ecs/math/Vec2f.java
@@ -7,6 +7,8 @@ import lombok.Data;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 
+import java.util.function.Function;
+
 /** Float impl of {@link Vec2}. */
 @Getter
 @RequiredArgsConstructor
@@ -45,6 +47,11 @@ public final class Vec2f implements Vec2<Float> {
 	}
 
 	@Override
+	public Vec2<Float> transform(final Function<Float, Float> xTransform, final Function<Float, Float> yTransform) {
+		return new Vec2f(xTransform.apply(getX()), yTransform.apply(getY()));
+	}
+
+	@Override
 	public Vec2<Integer> intValue() {
 		return Vec2i.builder().x(this.x.intValue()).y(this.y.intValue()).build();
 	}
diff --git a/core/src/main/java/coffee/liz/ecs/math/Vec2i.java b/core/src/main/java/coffee/liz/ecs/math/Vec2i.java
index dbe246e..c7f9c83 100644
--- a/core/src/main/java/coffee/liz/ecs/math/Vec2i.java
+++ b/core/src/main/java/coffee/liz/ecs/math/Vec2i.java
@@ -7,6 +7,8 @@ import lombok.Data;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 
+import java.util.function.Function;
+
 /** Integer impl of {@link Vec2}. */
 @Getter
 @RequiredArgsConstructor
@@ -40,6 +42,12 @@ public final class Vec2i implements Vec2<Integer> {
 	}
 
 	@Override
+	public Vec2<Integer> transform(final Function<Integer, Integer> xTransform,
+			final Function<Integer, Integer> yTransform) {
+		return new Vec2i(xTransform.apply(getX()), yTransform.apply(getY()));
+	}
+
+	@Override
 	public Vec2<Integer> intValue() {
 		return this;
 	}