From 8f410277c6eb05e4160acc4033eaa777ad0fd953 Mon Sep 17 00:00:00 2001
From: Irene Knapp <ireneista@gmail.com>
Date: Tue, 26 May 2020 19:28:37 -0700
Subject: Added code that generates a color selection dot.

---
 index.html | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/index.html b/index.html
index 64a2990..ba59d06 100644
--- a/index.html
+++ b/index.html
@@ -31,6 +31,17 @@ let ILLUMINANT_D65 = [ 0.950489, 1.0, 1.088840 ];
 function main() {
   let svgState = svgInit();
 
+  generateColorWheel(svgState);
+
+  let colorSelectionDotParameters = {
+    x: 5000,
+    y: -5000,
+  };
+
+  generateColorSelectionDot(svgState, colorSelectionDotParameters);
+}
+
+function generateColorWheel(svgState) {
   let colorWheelParameters = {
     scale: 10000,
     nStepsAround: 128,
@@ -131,6 +142,34 @@ function generateOneColorWheelChunk(svgState, colorWheelParameters, chunkParamet
 }
 
 
+function generateColorSelectionDot(svgState, colorSelectionDotParameters) {
+  let dotId = svgGenerateId(svgState, 'colorSelectionDot'),
+      translateParameters = [
+        colorSelectionDotParameters.x,
+        colorSelectionDotParameters.y
+      ];
+
+  let transform = 'translate(' + translateParameters.join(',') + ')';
+
+  let groupElement = document.createElementNS(svgState.SVG_NS, 'g');
+  groupElement.setAttribute('id', dotId);
+  groupElement.setAttribute('transform', transform);
+
+  let blackCircleElement = document.createElementNS(svgState.SVG_NS, 'circle');
+  blackCircleElement.setAttribute('r', '200');
+  blackCircleElement.setAttribute('fill', 'black');
+  groupElement.appendChild(blackCircleElement);
+
+  let whiteCircleElement = document.createElementNS(svgState.SVG_NS, 'circle');
+  whiteCircleElement.setAttribute('r', '150');
+  whiteCircleElement.setAttribute('stroke', 'white');
+  whiteCircleElement.setAttribute('stroke-width', '50');
+  groupElement.appendChild(whiteCircleElement);
+
+  svgState.svgElement.appendChild(groupElement);
+}
+
+
 function svgInit() {
   let svgState = { };
 
-- 
cgit 1.4.1