From bbd5848bdba0d34db76e21bb59f6257275df3ff6 Mon Sep 17 00:00:00 2001
From: Thomas Boch <thomas.boch@astro.unistra.fr>
Date: Thu, 16 Jan 2025 09:58:17 +0100
Subject: [PATCH] Bug fix: opacity is now available for Circle overlays (issue
 #215)

---
 src/js/shapes/Circle.js | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/js/shapes/Circle.js b/src/js/shapes/Circle.js
index 48d4291f..78c2b0f6 100644
--- a/src/js/shapes/Circle.js
+++ b/src/js/shapes/Circle.js
@@ -40,7 +40,7 @@ export let Circle = (function() {
      * @param {number[]} centerRaDec - right-ascension/declination 2-tuple of the circle's center in degrees
      * @param {number} radius - radius in degrees
      * @param {ShapeOptions} options - Configuration options for the circle
-     * 
+     *
      * @returns {Circle} - The circle shape object
      */
     let Circle = function(centerRaDec, radius, options) {
@@ -51,16 +51,17 @@ export let Circle = (function() {
         this.lineWidth = options["lineWidth"] || 2;
         this.selectionColor = options["selectionColor"] || '#00ff00';
         this.hoverColor = options["hoverColor"] || undefined;
+        this.opacity    = options['opacity']   || 1;
 
         // TODO : all graphic overlays should have an id
         this.id = 'circle-' + Utils.uuidv4();
 
         this.setCenter(centerRaDec);
         this.setRadius(radius);
-    	this.overlay = null;
+        this.overlay = null;
 
-    	this.isShowing = true;
-    	this.isSelected = false;
+        this.isShowing = true;
+        this.isSelected = false;
         this.isHovered = false;
         this.frame = options.frame || "icrs";
     };
@@ -223,7 +224,7 @@ export let Circle = (function() {
 
         var ra, dec, vertOnCircle, dx, dy;
         this.radius = Number.NEGATIVE_INFINITY;
-        
+
         // Project 4 points lying on the circle and take the minimal dist with the center as radius
         [[-1, 0], [1, 0], [0, -1], [0, 1]].forEach(([cardDirRa, cardDirDec]) => {
             ra = this.centerRaDec[0] + cardDirRa * this.radiusDegrees;
@@ -238,7 +239,7 @@ export let Circle = (function() {
                 this.radius = Math.max(Math.sqrt(dx*dx + dy*dy), this.radius);
 
                 hidden = false;
-            }            
+            }
         });
 
         if (hidden) {
@@ -267,6 +268,7 @@ export let Circle = (function() {
         }
 
         ctx.lineWidth = this.lineWidth;
+        ctx.globalAlpha = this.opacity;
         ctx.beginPath();
         ctx.arc(this.center.x, this.center.y, this.radius, 0, 2*Math.PI, false);
         if (!noStroke) {
@@ -295,7 +297,7 @@ export let Circle = (function() {
         if (circleDistance.x > (w/2 + this.radius)) { return false; }
         if (circleDistance.y > (h/2 + this.radius)) { return false; }
 
-        if (circleDistance.x <= (w/2)) { return true; } 
+        if (circleDistance.x <= (w/2)) { return true; }
         if (circleDistance.y <= (h/2)) { return true; }
 
         const dx = circleDistance.x - w/2;