// should be same color as the lines but only 15% opaque.
var rgb = new RGBColorParser(color);
var err_color =
'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')';
ctx.fillStyle = err_color;
ctx.beginPath();
// should be same color as the lines but only 15% opaque.
var rgb = new RGBColorParser(color);
var err_color =
'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')';
ctx.fillStyle = err_color;
ctx.beginPath();