Method getBounds

src/lib/geo/index.js:109–150

(margins, roundFactor)

  }

  getBounds(margins, roundFactor) {
    const bndT = (margins && margins[0]) || 0;
    const bndR = (margins && margins[1]) || 0;
    const bndB = (margins && margins[2]) || 0;
    const bndL = (margins && margins[3]) || 0;

    if (
      this.getWidth() - bndR - bndL > 0 &&
      this.getHeight() - bndT - bndB > 0
    ) {
      const topLeftCorner = this.transform_.pointLocation(
        Point.convert({
          x: bndL - this.getWidth() / 2,
          y: bndT - this.getHeight() / 2,
        })
      );
      const bottomRightCorner = this.transform_.pointLocation(
        Point.convert({
          x: this.getWidth() / 2 - bndR,
          y: this.getHeight() / 2 - bndB,
        })
      );

      let res = [
        topLeftCorner.lat,
        topLeftCorner.lng, // NW
        bottomRightCorner.lat,
        bottomRightCorner.lng, // SE
        bottomRightCorner.lat,
        topLeftCorner.lng, // SW
        topLeftCorner.lat,
        bottomRightCorner.lng, // NE
      ];

      if (roundFactor) {
        res = res.map((r) => Math.round(r * roundFactor) / roundFactor);
      }
      return res;
    }

    return [0, 0, 0, 0];
  }
}