zoomTo()

in src/components/ZoomableSVGGroup.js [261:286]

• 22 lines of code
• 3 McCabe index (conditional complexity)

  zoomTo(clientX, clientY, scaleMultiplier, event) {
    const prevMatrix = this.state.matrix;
    const prevScale = this.state.scale;
    const scale = prevScale * scaleMultiplier;
    const clientMatrix = this.el.ownerSVGElement.getScreenCTM();

    const x = (clientX * clientMatrix.a) - clientMatrix.e;
    const y = (clientY * clientMatrix.d) - clientMatrix.f;

    // guardrails for scale max and min
    if (scale > this.props.maxScale || scale < this.props.minScale) {
      return;
    }

    this.setState({
      scale,
      matrix: [
        scale,
        prevMatrix[1],
        prevMatrix[2],
        scale,
        x - (scaleMultiplier * (x - prevMatrix[4])),
        y - (scaleMultiplier * (y - prevMatrix[5])),
      ],
    }, () => this.props.onZoom(event, scale));
  }