Gradient supports percent value

Gradient supports percent value

lib/calculateBoundingBox.js

@@ -0,0 +1,59 @@
+import SvgPath from 'svgpath';
+import BoundingBox from './BoundingBox';
+
+export default function(d) {
+    let pathDriver = new SvgPath(d);
+    let boundingBox = new BoundingBox();
+    pathDriver
+        .abs()
+        .unarc()
+        .unshort()
+        .iterate((seg, index, x, y) => {
+            switch(seg[0]) {
+                case 'M':
+                case 'L':
+                    boundingBox.addPoint(
+                        seg[1],
+                        seg[2]
+                    );
+                    break;
+                case 'H':
+                    boundingBox.addX(seg[1]);
+                    break;
+                case 'V':
+                    boundingBox.addY(seg[1]);
+                    break;
+                case 'Q':
+                    boundingBox.addQuadraticCurve(
+                        x,
+                        y,
+                        seg[1],
+                        seg[2],
+                        seg[3],
+                        seg[4]
+                    );
+                    break;
+                case 'C':
+                    boundingBox.addBezierCurve(
+                        x,
+                        y,
+                        seg[1],
+                        seg[2],
+                        seg[3],
+                        seg[4],
+                        seg[5],
+                        seg[6]
+                    );
+                    break;
+            }
+        });
+
+    return {
+        width: boundingBox.width(),
+        height: boundingBox.height(),
+        x1: boundingBox.x1,
+        y1: boundingBox.y1,
+        x2: boundingBox.x2,
+        y2: boundingBox.y2
+    };
+}