vec2d - npm Package Compare versions

Comparing version 0.1.3 to 0.2.0

index.js

@@ -204,1 +204,20 @@ module.exports = v;
 };
+
+// reflect about axis originating from origin
+Vec2d.prototype.reflect = function(axis) {
+  return this.reflectAboutLine(new Vec2d(0, 0), axis);
+};
+
+Vec2d.prototype.reflectAboutLine = function(linePt1, linePt2) {
+  var normal = new Vec2d(
+      linePt2.x - linePt1.x,
+      linePt2.y - linePt1.x);
+  var temp = normal.x;
+  normal.x = -normal.y;
+  normal.y = temp;
+  normal.normalize();
+  var dot2 = 2 * this.dot(normal);
+  this.x -= dot2 * normal.x;
+  this.y -= dot2 * normal.y;
+  return this;
+};

package.json

 {
   "name": "vec2d",
-  "version": "0.1.3",
+  "version": "0.2.0",
   "description": "2d vector math with good unit tests",
@@ -5,0 +5,0 @@ "main": "index.js",

README.md

@@ -80,5 +80,7 @@ # vec2d
     - distanceSqrd
+    ✓ reflect 
+    ✓ reflectAboutLine 
 
 
-  43 tests complete (10 ms)
+  45 tests complete (11 ms)
   23 tests pending
@@ -85,0 +87,0 @@ ```

test.js

@@ -48,4 +48,4 @@ var v = require('./')
     var v1 = v.unit(Math.PI / 2);
-    assert.ok(Math.abs(0 - v1.x) < EPSILON);
-    assert.ok(Math.abs(1 - v1.y) < EPSILON);
+    assertCloseEnough(0, v1.x);
+    assertCloseEnough(1, v1.y);
   });
@@ -56,4 +56,4 @@ });
     var v1 = Vec2d.unit(Math.PI);
-    assert.ok(Math.abs(-1 - v1.x) < EPSILON);
-    assert.ok(Math.abs(0 - v1.y) < EPSILON);
+    assertCloseEnough(-1, v1.x);
+    assertCloseEnough(0, v1.y);
   });
@@ -180,2 +180,22 @@ it("offset", function() {
   it("distanceSqrd");
+  it("reflect", function() {
+    var v1 = v(1, 0);
+    var axis = v(0, 1);
+    var v2 = v1.reflect(axis);
+    assert.strictEqual(v1.x, -1);
+    assert.strictEqual(v1.y, 0);
+  });
+  it("reflectAboutLine", function() {
+    var v1 = v(1, -1);
+    var linePt1 = v(1, 1);
+    var linePt2 = v(-1, -1);
+    var v2 = v1.reflectAboutLine(linePt1, linePt2);
+    assert.strictEqual(v2, v1);
+    assertCloseEnough(v1.x, -1);
+    assertCloseEnough(v1.y, 1);
+  });
 });
+
+function assertCloseEnough(a, b) {
+  assert.ok(Math.abs(a - b) < EPSILON);
+}

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Improved metrics

Total package byte prevSize

11720

increased by9.5%

Lines of code

377

increased by10.56%

Number of lines in readme file

89

increased by2.3%

No dependency changes