From de4ffc1d6934ec65f0a25801ed15fc79876c4fc6 Mon Sep 17 00:00:00 2001
From: Joost De Cock <joost@decock.org>
Date: Thu, 6 Sep 2018 15:32:43 +0200
Subject: [PATCH] :sparkles: Added support for anchored sampling

---
 src/path.js    | 15 +++++++++++++++
 src/pattern.js | 16 ++++++++++++++++
 src/point.js   |  8 ++++++++
 3 files changed, 39 insertions(+)

diff --git a/src/path.js b/src/path.js
index bb53dd83176..ebe5421b084 100644
--- a/src/path.js
+++ b/src/path.js
@@ -761,4 +761,19 @@ Path.prototype.trim = function() {
   return this;
 };
 
+/** Applies a path translate transform */
+Path.prototype.translate = function(x, y) {
+  for (let op of this.ops) {
+    if (op.type !== "close") {
+      op.to = op.to.translate(x, y);
+    }
+    if (op.type === "curve") {
+      op.cp1 = op.cp1.translate(x, y);
+      op.cp2 = op.cp2.translate(x, y);
+    }
+  }
+
+  return this;
+};
+
 export default Path;
diff --git a/src/pattern.js b/src/pattern.js
index cb5e84091bf..dabc071d89d 100644
--- a/src/pattern.js
+++ b/src/pattern.js
@@ -111,6 +111,7 @@ Pattern.prototype.sampleParts = function() {
  */
 Pattern.prototype.sampleOption = function(optionName) {
   let step, val;
+  let anchors = {};
   let parts = this.sampleParts();
   let option = this.config.options[optionName];
   if (typeof option.min === "undefined" || typeof option.max === "undefined") {
@@ -126,10 +127,25 @@ Pattern.prototype.sampleOption = function(optionName) {
     );
     this.draft();
     for (let i in this.parts) {
+      let anchor = false;
+      let dx = 0;
+      let dy = 0;
+      if (this.parts[i].points.anchor) {
+        if (typeof anchors[i] === "undefined")
+          anchors[i] = this.parts[i].points.anchor;
+        else {
+          if (!anchors[i].sitsOn(this.parts[i].points.anchor)) {
+            dx = this.parts[i].points.anchor.dx(anchors[i]);
+            dy = this.parts[i].points.anchor.dy(anchors[i]);
+          }
+        }
+      }
       for (let j in this.parts[i].paths) {
         parts[i].paths[j + "_" + l] = this.parts[i].paths[j]
           .clone()
           .attr("class", "sample-" + l, true);
+        if (this.parts[i].points.anchor)
+          parts[i].paths[j + "_" + l].translate(dx, dy);
       }
     }
     val += step;
diff --git a/src/point.js b/src/point.js
index 14571f336d3..6f57775204b 100644
--- a/src/point.js
+++ b/src/point.js
@@ -130,4 +130,12 @@ Point.prototype.clone = function() {
   return clone;
 };
 
+/** Applies a translate transform */
+Point.prototype.translate = function(x, y) {
+  this.x += x;
+  this.y += y;
+
+  return this;
+};
+
 export default Point;