updateControlLines()

in src/engine/tools23d/mprrenderer.js [342:479]
128 lines of code
1 McCabe index (conditional complexity)

  updateControlLines() {
    this.clearControlLines();
    const SHIFT_MUL = 7;
    const horShift = SHIFT_MUL * this.m_vertLineWidth; // this is correct, not a typo or mis-anything
    const vertShift = SHIFT_MUL * this.m_horLineWidth;

    // lines on Z
    const xCenterOnZ =
      this.m_projectionRect[PROJECTION_Z].xMin +
      this.m_sliceRatio[PROJECTION_X] * (this.m_projectionRect[PROJECTION_Z].xMax - this.m_projectionRect[PROJECTION_Z].xMin);
    const yCenterOnZ =
      this.m_projectionRect[PROJECTION_Z].yMin +
      this.m_sliceRatio[PROJECTION_Y] * (this.m_projectionRect[PROJECTION_Z].yMax - this.m_projectionRect[PROJECTION_Z].yMin);
    // blue X projection line on Z projection
    this.m_linesXOnZ = [
      new Line2D(
        this.m_scene,
        this.m_vertLineWidth,
        xCenterOnZ,
        this.m_projectionRect[PROJECTION_Z].yMax,
        xCenterOnZ,
        yCenterOnZ + vertShift,
        this.m_materialLineBlue
      ),
      new Line2D(
        this.m_scene,
        this.m_vertLineWidth,
        xCenterOnZ,
        yCenterOnZ - vertShift,
        xCenterOnZ,
        this.m_projectionRect[PROJECTION_Z].yMin,
        this.m_materialLineBlue
      ),
    ];
    // green Y projection line on Z projection
    this.m_linesYOnZ = [
      new Line2D(
        this.m_scene,
        this.m_horLineWidth,
        this.m_projectionRect[PROJECTION_Z].xMin,
        yCenterOnZ,
        xCenterOnZ - horShift,
        yCenterOnZ,
        this.m_materialLineGreen
      ),
      new Line2D(
        this.m_scene,
        this.m_horLineWidth,
        xCenterOnZ + horShift,
        yCenterOnZ,
        this.m_projectionRect[PROJECTION_Z].xMax,
        yCenterOnZ,
        this.m_materialLineGreen
      ),
    ];
    this.m_controlPoint[PROJECTION_Z].x = xCenterOnZ;
    this.m_controlPoint[PROJECTION_Z].y = yCenterOnZ;

    // lines on Y
    const xCenterOnY =
      this.m_projectionRect[PROJECTION_Y].xMin +
      this.m_sliceRatio[PROJECTION_X] * (this.m_projectionRect[PROJECTION_Y].xMax - this.m_projectionRect[PROJECTION_Y].xMin);
    const yCenterOnY =
      this.m_projectionRect[PROJECTION_Y].yMin +
      this.m_sliceRatio[PROJECTION_Z] * (this.m_projectionRect[PROJECTION_Y].yMax - this.m_projectionRect[PROJECTION_Y].yMin);
    // blue X projection line on Y projection
    this.m_linesXOnY = [
      new Line2D(
        this.m_scene,
        this.m_vertLineWidth,
        xCenterOnY,
        this.m_projectionRect[PROJECTION_Y].yMax,
        xCenterOnY,
        yCenterOnY + vertShift,
        this.m_materialLineBlue
      ),
      new Line2D(
        this.m_scene,
        this.m_vertLineWidth,
        xCenterOnY,
        yCenterOnY - vertShift,
        xCenterOnY,
        this.m_projectionRect[PROJECTION_Y].yMin,
        this.m_materialLineBlue
      ),
    ];
    this.m_controlLineXOnY = new Line2D(
      this.m_scene,
      this.m_vertLineWidth,
      xCenterOnY,
      yCenterOnY + this.m_yControlShift,
      xCenterOnY,
      yCenterOnY - this.m_yControlShift,
      this.m_materialLineBlue
    );
    this.m_controlPoint[PROJECTION_Y].x = xCenterOnY;
    this.m_controlPoint[PROJECTION_Y].y = yCenterOnY;

    // lines on X
    const xCenterOnX =
      this.m_projectionRect[PROJECTION_X].xMin +
      this.m_sliceRatio[PROJECTION_Y] * (this.m_projectionRect[PROJECTION_X].xMax - this.m_projectionRect[PROJECTION_X].xMin);
    const yCenterOnX =
      this.m_projectionRect[PROJECTION_X].yMin +
      this.m_sliceRatio[PROJECTION_Z] * (this.m_projectionRect[PROJECTION_X].yMax - this.m_projectionRect[PROJECTION_X].yMin);
    // green Y projection line on X projection
    this.m_linesYOnX = [
      new Line2D(
        this.m_scene,
        this.m_vertLineWidth,
        xCenterOnX,
        this.m_projectionRect[PROJECTION_X].yMax,
        xCenterOnX,
        yCenterOnX + vertShift,
        this.m_materialLineGreen
      ),
      new Line2D(
        this.m_scene,
        this.m_vertLineWidth,
        xCenterOnX,
        yCenterOnX - vertShift,
        xCenterOnX,
        this.m_projectionRect[PROJECTION_X].yMin,
        this.m_materialLineGreen
      ),
    ];
    this.m_controlLineYOnX = new Line2D(
      this.m_scene,
      this.m_vertLineWidth,
      xCenterOnX,
      yCenterOnX - this.m_yControlShift,
      xCenterOnX,
      yCenterOnX + this.m_yControlShift,
      this.m_materialLineGreen
    );
    this.m_controlPoint[PROJECTION_X].x = xCenterOnX;
    this.m_controlPoint[PROJECTION_X].y = yCenterOnX;
  }