how to draw arc which is same as origin canvas arc api?

[lzuntalented]

Why DrawNode.drawCircle have not a param like startAngle?
It is often necessary to draw an arc.
When I write it by myself, DrawNode.drawSegment be called many time.

The error show me:

Failed to allocate buffer for DrawNode: buffer for 2034 vertices requested

So, could you help me to fix it?
It is very important to me. Thanks!

The code like:

drawCircle: function (handler, center, radius, startAngle, endAngle, segments, drawLineToCenter, lineWidth, color) {
		const _vertices = []; 
		const angle = startAngle;
        lineWidth = lineWidth || this._lineWidth;
        color = color || this._drawColor;
        var coef = endAngle / segments, i, len;
        for (i = 0; i <= segments; i++) {
            var rads = i * coef;
            var j = radius * Math.cos(rads + angle) + center.x;
            var k = radius * Math.sin(rads + angle) + center.y;
            _vertices.push([j, k]);
        }
        if (drawLineToCenter)
            _vertices.push([center.x, center.y]);

        for (i = 0, len = _vertices.length - 1; i < len; i += 1) {
        	const _from = {};
        	const _to = {};
            _from.x = _vertices[i][0];
            _from.y = _vertices[i][1];
            if (i === len - 1) {
            	if (endAngle > 2 * Math.PI) {
            		_to.x = _vertices[0][0];
            		_to.y = _vertices[0][1];
            	} else {
            		break;
            	}
            } else {
            	_to.x = _vertices[i + 1][0];
            	_to.y = _vertices[i + 1][1];
            }
            
            handler.drawSegment(_from, _to, lineWidth, color);
        }
    }