Method getCaretPosition

src/plugins/plugin.tooltip.js:699–754

(tooltipPoint, size, options)

  }

  getCaretPosition(tooltipPoint, size, options) {
    const {xAlign, yAlign} = this;
    const {caretSize, cornerRadius} = options;
    const {topLeft, topRight, bottomLeft, bottomRight} = toTRBLCorners(cornerRadius);
    const {x: ptX, y: ptY} = tooltipPoint;
    const {width, height} = size;
    let x1, x2, x3, y1, y2, y3;

    if (yAlign === 'center') {
      y2 = ptY + (height / 2);

      if (xAlign === 'left') {
        x1 = ptX;
        x2 = x1 - caretSize;

        // Left draws bottom -> top, this y1 is on the bottom
        y1 = y2 + caretSize;
        y3 = y2 - caretSize;
      } else {
        x1 = ptX + width;
        x2 = x1 + caretSize;

        // Right draws top -> bottom, thus y1 is on the top
        y1 = y2 - caretSize;
        y3 = y2 + caretSize;
      }

      x3 = x1;
    } else {
      if (xAlign === 'left') {
        x2 = ptX + Math.max(topLeft, bottomLeft) + (caretSize);
      } else if (xAlign === 'right') {
        x2 = ptX + width - Math.max(topRight, bottomRight) - caretSize;
      } else {
        x2 = this.caretX;
      }

      if (yAlign === 'top') {
        y1 = ptY;
        y2 = y1 - caretSize;

        // Top draws left -> right, thus x1 is on the left
        x1 = x2 - caretSize;
        x3 = x2 + caretSize;
      } else {
        y1 = ptY + height;
        y2 = y1 + caretSize;

        // Bottom draws right -> left, thus x1 is on the right
        x1 = x2 + caretSize;
        x3 = x2 - caretSize;
      }
      y3 = y1;
    }
    return {x1, x2, x3, y1, y2, y3};
  }

  drawTitle(pt, ctx, options) {