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Merge pull request #339 from chrismayer/angle-tool
Extend MeasureTool by angle tool
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /** | ||
| * Util class for angle related calculations. | ||
| */ | ||
| const AngleUtil = { | ||
| /** | ||
| * Determine the angle between two coordinates. The angle will be between | ||
| * -180° and 180°, with 0° being in the east. The angle will increase | ||
| * counter-clockwise. | ||
| * | ||
| * Inspired by http://stackoverflow.com/a/31136507 | ||
| * | ||
| * @param {ol/coordinate} start The start coordinates of the line with the | ||
| * x-coordinate being at index `0` and y-coordinate being at index `1`. | ||
| * @param {ol/coordinate} end The end coordinates of the line with the | ||
| * x-coordinate being at index `0` and y-coordinate being at index `1`. | ||
| * @returns {Number} the angle in degrees, ranging from -180° to 180°. | ||
| */ | ||
| calcAngle (start, end) { | ||
| const dx = start[0] - end[0]; | ||
| const dy = start[1] - end[1]; | ||
| // range (-PI, PI] | ||
| let theta = Math.atan2(dy, dx); | ||
| // rads to degs, range (-180, 180] | ||
| theta *= 180 / Math.PI; | ||
| return theta; | ||
| }, | ||
|
|
||
| /** | ||
| * Determine the angle between two coordinates. The angle will be between | ||
| * 0° and 360°, with 0° being in the east. The angle will increase | ||
| * counter-clockwise. | ||
| * | ||
| * Inspired by http://stackoverflow.com/a/31136507 | ||
| * | ||
| * @param {ol/coordinate} start The start coordinates of the line with the | ||
| * x-coordinate being at index `0` and y-coordinate being at index `1`. | ||
| * @param {ol/coordinate} end The end coordinates of the line with the | ||
| * x-coordinate being at index `0` and y-coordinate being at index `1`. | ||
| * @returns {Number} the angle in degreees, ranging from 0° and 360°. | ||
| */ | ||
| angle360 (start, end) { | ||
| // range (-180, 180] | ||
| let theta = this.calcAngle(start, end); | ||
| if (theta < 0) { | ||
| // range [0, 360) | ||
| theta = 360 + theta; | ||
| } | ||
| return theta; | ||
| }, | ||
|
|
||
| /** | ||
| * This methods adds an offset of 90° to an counter-clockwise increasing | ||
| * angle of a line so that the origin (0°) lies at the top (in the north). | ||
| * | ||
| * @param {Number} angle360 The input angle obtained counter-clockwise, with | ||
| * 0° degrees being in the east | ||
| * @returns {Number} The adjusted angle, with 0° being in the north | ||
| */ | ||
| makeZeroDegreesAtNorth (angle360) { | ||
| let corrected = angle360 + 90; | ||
| if (corrected > 360) { | ||
| corrected = corrected - 360; | ||
| } | ||
| return corrected; | ||
| }, | ||
|
|
||
| /** | ||
| * Given an angle between 0° and 360° this angle returns the exact opposite | ||
| * of the angle, e.g. for 90° you'll get back 270°. This effectively turns | ||
| * the direction of the angle from counter-clockwise to clockwise. | ||
| * | ||
| * @param {Number} angle360 The input angle obtained counter-clockwise | ||
| * @returns {Number} The clockwise angle | ||
| */ | ||
| makeClockwise (angle360) { | ||
| return 360 - angle360; | ||
| } | ||
| } | ||
|
|
||
| export default AngleUtil; |
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