Merge pull request #1633 from leoncvlt/dev

Add FlxMath.remapToRange()
HaxeFlixel · Oct 18, 2015 · d0d1122 · d0d1122
2 parents 898376c + cd409a5
commit d0d1122
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diff --git a/flixel/math/FlxMath.hx b/flixel/math/FlxMath.hx
@@ -273,6 +273,22 @@ class FlxMath
 
 		return output;
 	}
+
+	/**
+	 * Re-maps a number from one range to another.
+	 * 
+	 * @param 	value	The incoming value to be converted
+	 * @param 	start1 	Lower bound of the value's current range
+	 * @param 	stop1 	Upper bound of the value's current range
+	 * @param 	start2  Lower bound of the value's target range
+	 * @param 	stop2 	Upper bound of the value's target range
+	 
+	 * @return The wrapped value
+	 */
+	public static function remapToRange(value:Float, start1:Float, stop1:Float, start2:Float, stop2:Float)
+	{
+		return start2 + (value - start1) * ((stop2 - start2) / (stop1 - start1));
+	}
 
 	/**
 	 * Finds the dot product value of two vectors

diff --git a/tests/unit/src/flixel/math/FlxMathTest.hx b/tests/unit/src/flixel/math/FlxMathTest.hx
@@ -43,6 +43,14 @@ class FlxMathTest extends FlxTest
 		Assert.isTrue(FlxMath.sameSign(-5, -30));
 		Assert.isFalse(FlxMath.sameSign(-5, 1));
 	}
+
+	@Test
+	function testRemapToRange()
+	{
+		Assert.areEqual(35, FlxMath.remapToRange(5,0,10,25,45));
+		Assert.areEqual(23, FlxMath.remapToRange(-1,0,10,25,45));
+		Assert.areEqual(-2, FlxMath.remapToRange(2,10,1,-10,-1));
+	}
 
 	@Test
 	function testFastTrig()