Method activate

js/primitive.js:10–18

(type)

  }

  activate(type) {
    this.type = type;
    this.state = {};
    if (type === 'line' || type === 'brush' || type === 'eraser' || type === 'arrow') {
      this.ctx.lineJoin = 'round';
    } else {
      this.ctx.lineJoin = 'miter';
    }
  }

  setLineWidth(width) {
    if (`${width}`.match(/^\d+$/)) {