From 6601af934029d1a3c54c61da4bb68d54032aa7d3 Mon Sep 17 00:00:00 2001
From: Andrea Bogazzi <andreabogazzi79@gmail.com>
Date: Sun, 17 Jul 2016 10:31:51 +0200
Subject: [PATCH] gradientInfinity (#3082)

* gradientInfinity
* updated tests
---
 src/gradient.class.js |  17 +++-
 test/unit/gradient.js | 192 ++++++++++++++++++++++++++++++++++++------
 2 files changed, 179 insertions(+), 30 deletions(-)

diff --git a/src/gradient.class.js b/src/gradient.class.js
index 09d3643875d..972850f98fe 100644
--- a/src/gradient.class.js
+++ b/src/gradient.class.js
@@ -332,11 +332,18 @@
        */
 
       var colorStopEls = el.getElementsByTagName('stop'),
-          type = (el.nodeName === 'linearGradient' ? 'linear' : 'radial'),
+          type,
           gradientUnits = el.getAttribute('gradientUnits') || 'objectBoundingBox',
           gradientTransform = el.getAttribute('gradientTransform'),
           colorStops = [],
-          coords = { }, ellipseMatrix;
+          coords, ellipseMatrix;
+
+      if (el.nodeName === 'linearGradient' || el.nodeName === 'LINEARGRADIENT') {
+        type = 'linear';
+      }
+      else {
+        type = 'radial';
+      }
 
       if (type === 'linear') {
         coords = getLinearCoords(el);
@@ -386,6 +393,12 @@
   function _convertPercentUnitsToValues(object, options, gradientUnits) {
     var propValue, addFactor = 0, multFactor = 1, ellipseMatrix = '';
     for (var prop in options) {
+      if (options[prop] === 'Infinity') {
+        options[prop] = 1;
+      }
+      else if (options[prop] === '-Infinity') {
+        options[prop] = 0;
+      }
       propValue = parseFloat(options[prop], 10);
       if (typeof options[prop] === 'string' && /^\d+%$/.test(options[prop])) {
         multFactor = 0.01;
diff --git a/test/unit/gradient.js b/test/unit/gradient.js
index 4aee8893003..6acdb2e4efe 100644
--- a/test/unit/gradient.js
+++ b/test/unit/gradient.js
@@ -160,13 +160,50 @@
 
     ok(gradient instanceof fabric.Gradient);
 
-    // TODO: need to double check these values
+    equal(gradient.coords.x1, 0);
+    equal(gradient.coords.y1, 0);
+    equal(gradient.coords.x2, 100);
+    equal(gradient.coords.y2, 0);
 
-    equal(gradient.coords.x1, 50);
-    equal(gradient.coords.y1, 50);
+    equal(gradient.colorStops[0].offset, 1);
+    equal(gradient.colorStops[1].offset, 0);
+
+    equal(gradient.colorStops[0].color, 'rgb(0,0,0)');
+    equal(gradient.colorStops[1].color, 'rgb(255,255,255)');
+
+    equal(gradient.colorStops[0].opacity, 0);
+  });
+
+  test('fromElement linearGradient with Infinity', function() {
+    ok(typeof fabric.Gradient.fromElement == 'function');
+
+    var element = fabric.document.createElement('linearGradient');
+    var stop1 = fabric.document.createElement('stop');
+    var stop2 = fabric.document.createElement('stop');
+
+    stop1.setAttribute('offset', '0%');
+    stop1.setAttribute('stop-color', 'white');
+
+    stop2.setAttribute('offset', '100%');
+    stop2.setAttribute('stop-color', 'black');
+    stop2.setAttribute('stop-opacity', '0');
 
-    //equal(gradient.coords.x2, 100);
-    //equal(gradient.coords.y2, 100);
+    element.setAttribute('x1', '-Infinity');
+    element.setAttribute('x2', 'Infinity');
+    element.setAttribute('y1', 'Infinity');
+    element.setAttribute('y2', '-Infinity');
+    element.appendChild(stop1);
+    element.appendChild(stop2);
+
+    var object = new fabric.Object({ width: 100, height: 100, top: 0, left: 0 });
+    var gradient = fabric.Gradient.fromElement(element, object);
+
+    ok(gradient instanceof fabric.Gradient);
+
+    equal(gradient.coords.x1, 0);
+    equal(gradient.coords.y1, 100);
+    equal(gradient.coords.x2, 100);
+    equal(gradient.coords.y2, 0);
 
     equal(gradient.colorStops[0].offset, 1);
     equal(gradient.colorStops[1].offset, 0);
@@ -202,6 +239,117 @@
     equal(gradient.colorStops[1].offset, 0);
   });
 
+  test('fromElement with x1,x2,y1,2 linear', function() {
+    ok(typeof fabric.Gradient.fromElement == 'function');
+
+    var element = fabric.document.createElement('linearGradient');
+
+    element.setAttribute('x1', '30%');
+    element.setAttribute('x2', '20%');
+    element.setAttribute('y1', '0.1');
+    element.setAttribute('y2', 'Infinity');
+
+    var object = new fabric.Object({ width: 200, height: 200 });
+    var gradient = fabric.Gradient.fromElement(element, object);
+    equal(gradient.coords.x1, 60);
+    equal(gradient.coords.y1, 20);
+    equal(gradient.coords.x2, 40);
+    equal(gradient.coords.y2, 200);
+    object = new fabric.Object({ width: 200, height: 200, top: 50, left: 10 });
+    gradient = fabric.Gradient.fromElement(element, object);
+    equal(gradient.coords.x1, 70);
+    equal(gradient.coords.y1, 70);
+    equal(gradient.coords.x2, 50);
+    equal(gradient.coords.y2, 250);
+  });
+
+  test('fromElement with x1,x2,y1,2 radial', function() {
+    ok(typeof fabric.Gradient.fromElement == 'function');
+
+    var element = fabric.document.createElement('radialGradient');
+
+    element.setAttribute('fx', '30%');
+    element.setAttribute('fy', '20%');
+    element.setAttribute('cx', '0.1');
+    element.setAttribute('cy', '1');
+    element.setAttribute('r', '100%');
+
+    var object = new fabric.Object({ width: 200, height: 200 });
+    var gradient = fabric.Gradient.fromElement(element, object);
+    equal(gradient.coords.x1, 60, 'should change with width height');
+    equal(gradient.coords.y1, 40, 'should change with width height');
+    equal(gradient.coords.x2, 20, 'should change with width height');
+    equal(gradient.coords.y2, 200, 'should change with width height');
+    equal(gradient.coords.r1, 0, 'should change with width height');
+    equal(gradient.coords.r2, 200, 'should change with width height');
+
+    object = new fabric.Object({ width: 200, height: 200, top: 10, left: 10 });
+    gradient = fabric.Gradient.fromElement(element, object);
+    equal(gradient.coords.x1, 70, 'should change with top left');
+    equal(gradient.coords.y1, 50, 'should change with top left');
+    equal(gradient.coords.x2, 30, 'should change with top left');
+    equal(gradient.coords.y2, 210, 'should change with top left');
+    equal(gradient.coords.r1, 10, 'should change with top left');
+    equal(gradient.coords.r2, 210, 'should change with top left');
+  });
+
+  test('fromElement with x1,x2,y1,2 radial userSpaceOnUse', function() {
+    ok(typeof fabric.Gradient.fromElement == 'function');
+
+    var element = fabric.document.createElement('radialGradient');
+
+    element.setAttribute('fx', '30');
+    element.setAttribute('fy', '20');
+    element.setAttribute('cx', '15');
+    element.setAttribute('cy', '18');
+    element.setAttribute('r', '100');
+    element.setAttribute('gradientUnits', 'userSpaceOnUse');
+
+    var object = new fabric.Object({ width: 200, height: 200 });
+    var gradient = fabric.Gradient.fromElement(element, object);
+    equal(gradient.coords.x1, 30, 'should not change with width height');
+    equal(gradient.coords.y1, 20, 'should not change with width height');
+    equal(gradient.coords.x2, 15, 'should not change with width height');
+    equal(gradient.coords.y2, 18, 'should not change with width height');
+    equal(gradient.coords.r1, 0, 'should not change with width height');
+    equal(gradient.coords.r2, 100, 'should not change with width height');
+
+    object = new fabric.Object({ width: 200, height: 200, top: 50, left: 60 });
+    gradient = fabric.Gradient.fromElement(element, object);
+    equal(gradient.coords.x1, 30, 'should not change with top left');
+    equal(gradient.coords.y1, 20, 'should not change with top left');
+    equal(gradient.coords.x2, 15, 'should not change with top left');
+    equal(gradient.coords.y2, 18, 'should not change with top left');
+    equal(gradient.coords.r1, 0, 'should not change with top left');
+    equal(gradient.coords.r2, 100, 'should not change with top left');
+  });
+
+  test('fromElement with x1,x2,y1,2 linear userSpaceOnUse', function() {
+    ok(typeof fabric.Gradient.fromElement == 'function');
+
+    var element = fabric.document.createElement('linearGradient');
+
+    element.setAttribute('x1', '30');
+    element.setAttribute('y1', '20');
+    element.setAttribute('x2', '15');
+    element.setAttribute('y2', '18');
+    element.setAttribute('gradientUnits', 'userSpaceOnUse');
+
+    var object = new fabric.Object({ width: 200, height: 200 });
+    var gradient = fabric.Gradient.fromElement(element, object);
+    equal(gradient.coords.x1, 30, 'should not change with width height');
+    equal(gradient.coords.y1, 20, 'should not change with width height');
+    equal(gradient.coords.x2, 15, 'should not change with width height');
+    equal(gradient.coords.y2, 18, 'should not change with width height');
+
+    object = new fabric.Object({ width: 200, height: 200, top: 40, left: 40 });
+    gradient = fabric.Gradient.fromElement(element, object);
+    equal(gradient.coords.x1, 30, 'should not change with top left');
+    equal(gradient.coords.y1, 20, 'should not change with top left');
+    equal(gradient.coords.x2, 15, 'should not change with top left');
+    equal(gradient.coords.y2, 18, 'should not change with top left');
+  });
+
   test('fromElement radialGradient', function() {
     ok(typeof fabric.Gradient.fromElement == 'function');
 
@@ -223,13 +371,10 @@
 
     ok(gradient instanceof fabric.Gradient);
 
-    // TODO: need to double check these values
-
     equal(gradient.coords.x1, 50);
     equal(gradient.coords.y1, 50);
-
-    //equal(gradient.coords.x2, 100);
-    //equal(gradient.coords.y2, 100);
+    equal(gradient.coords.x2, 50);
+    equal(gradient.coords.y2, 50);
 
     equal(gradient.colorStops[0].offset, 1);
     equal(gradient.colorStops[1].offset, 0);
@@ -259,13 +404,10 @@
 
     ok(gradient instanceof fabric.Gradient);
 
-    // TODO: need to double check these values
-
     equal(gradient.coords.x1, 50);
     equal(gradient.coords.y1, 50);
-
-    //equal(gradient.coords.x2, 100);
-    //equal(gradient.coords.y2, 100);
+    equal(gradient.coords.x2, 50);
+    equal(gradient.coords.y2, 50);
 
     equal(gradient.colorStops[0].offset, 1);
     equal(gradient.colorStops[1].offset, 0);
@@ -311,13 +453,10 @@
 
     ok(gradient instanceof fabric.Gradient);
 
-    // TODO: need to double check these values
-
-    equal(gradient.coords.x1, 50);
-    equal(gradient.coords.y1, 50);
-
-    //equal(gradient.coords.x2, 100);
-    //equal(gradient.coords.y2, 100);
+    equal(gradient.coords.x1, 0);
+    equal(gradient.coords.y1, 0);
+    equal(gradient.coords.x2, 100);
+    equal(gradient.coords.y2, 0);
 
     equal(gradient.colorStops[0].offset, 1);
     equal(gradient.colorStops[1].offset, 0.75);
@@ -371,13 +510,10 @@
 
     ok(gradient instanceof fabric.Gradient);
 
-    // TODO: need to double check these values
-
     equal(gradient.coords.x1, 50);
     equal(gradient.coords.y1, 50);
-
-    //equal(gradient.coords.x2, 100);
-    //equal(gradient.coords.y2, 100);
+    equal(gradient.coords.x2, 50);
+    equal(gradient.coords.y2, 50);
 
     equal(gradient.colorStops[0].offset, 1);
     equal(gradient.colorStops[1].offset, 0.75);
@@ -395,7 +531,7 @@
     equal(gradient.colorStops[3].opacity, 1);
   });
 
-  test('forObject linearCradient', function() {
+  test('forObject linearGradient', function() {
     ok(typeof fabric.Gradient.forObject == 'function');
 
     var object = new fabric.Object({ width: 50, height: 50 });