drawPixi(graphics) {
        const total = this.model.data.length;
        let i, d, color;
        for (i = 0; i < total; i++) {
            d = this.model.data[i];
            color = PixiColor(i, d, this.color_);
            PixiLines(graphics, d, this.lineWidth, color);
        }
    }
Draw text in WebGL with PIXI.js
@param {PIXI.Graphics} graphics