Higher FPS! (#19)

src/utils.js

@@ -9,6 +9,9 @@ export const sqrt2 = Math.sqrt(2);
 // (2*S gives long width)
 export const sqrt3 = Math.sqrt(3);
 
+// leg factor of isoscelese right triangle with unit hypotenuse
+export const invSqrt2 = 1 / sqrt2
+
 export function clone(obj) {
 	return JSON.parse(JSON.stringify(obj));
 }
@@ -141,3 +144,13 @@ export function extend (obj, ...sources) {
 
 	return extended;
 }
+
+export function quickCanvas (draw, height, width = height) {
+	const canvas = document.createElement('canvas');
+	canvas.height = height;
+	canvas.width = width;
+
+	draw(canvas.getContext('2d'), canvas.height, canvas.width);
+
+	return canvas;
+}