drawPoint(x, y, elementName) {
    let ctx = this.ctx;
    let offsetX = this.offsetX;
    let offsetY = this.offsetY;
    ctx.save();
    ctx.globalCompositeOperation = 'destination-out';
    ctx.beginPath();
    ctx.arc(x + offsetX, y + offsetY, 1.5, 0, MathHelper.twoPI, true);
    ctx.closePath();
    ctx.fill();
    ctx.globalCompositeOperation = 'source-over';
    ctx.beginPath();
    ctx.arc(x + this.offsetX, y + this.offsetY, 0.75, 0, MathHelper.twoPI, false);
    ctx.fillStyle = this.themeManager.getColor(elementName);
    ctx.fill();
    ctx.restore();
  }
Draw a point to the canvas.

@param {Number} x The x position of the point.
@param {Number} y The y position of the point.
@param {String} elementName The name of the element (single-letter).