fixing bug with drawing circle

Author: lauren mccarthy

lib/p5.js

@@ -3937,7 +3937,7 @@ var shape2d_primitives = function (require, core, canvas, constants) {
       var vals = canvas.modeAdjust(x, y, w, h, this._ellipseMode);
       ctx.beginPath();
       if (w === h) {
-        ctx.arc(vals.x, vals.y, vals.w / 2, 0, 2 * Math.PI, false);
+        ctx.arc(vals.x + vals.w / 2, vals.y + vals.w / 2, vals.w / 2, 0, 2 * Math.PI, false);
       } else {
         var kappa = 0.5522848, ox = vals.w / 2 * kappa, oy = vals.h / 2 * kappa, xe = vals.x + vals.w, ye = vals.y + vals.h, xm = vals.x + vals.w / 2, ym = vals.y + vals.h / 2;
         ctx.moveTo(vals.x, ym);