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Impove various angle related code in Point.

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This commit is contained in:
Jürg Lehni 2011-03-06 21:03:43 +00:00
parent 420e0435ed
commit 47d55e19f5
1 changed files with 26 additions and 28 deletions
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54
src/basic/Point.js
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@ -22,6 +22,10 @@ var Point = this.Point = Base.extend({
} else if (Array.isArray(arg0)) {
this.x = arg0[0];
this.y = arg0.length > 1 ? arg0[1] : arg0[0];
} else if (arg0.angle) {
this.x = arg0.length;
this.y = 0;
this.setAngle(arg0.angle);
} else if (typeof arg0 === 'number') {
this.x = this.y = arg0;
} else {
@ -171,18 +175,6 @@ var Point = this.Point = Base.extend({
return res;
},
getAngleInRadians: function() {
// TODO: Not sur we want this one, but if so, just rely on
// this.getAngle(), which caches values internally?
return Math.atan2(this.y, this.x);
},
getAngleInDegrees: function() {
// TODO: Not sur we want this one, but if so, just rely on
// this.getAngle(), which caches values internally?
return Math.atan2(this.y, this.x) * 180 / Math.PI;
},
getQuadrant: function() {
if (this.x >= 0) {
if (this.y >= 0) {
@ -213,22 +205,8 @@ var Point = this.Point = Base.extend({
*
* @param point
*/
getAngle: function() {
var angle;
if (arguments.length) {
var point = Point.read(arguments);
var div = this.getLength() * point.getLength();
if (div == 0) {
return NaN;
} else {
angle = Math.acos(this.dot(point) / div);
}
} else {
if (this._angle == null)
this._angle = Math.atan2(this.y, this.x);
angle = this._angle;
}
return angle * 180 / Math.PI;
getAngle: function(point) {
return this.getAngleInRadians(point) * 180 / Math.PI;
},
setAngle: function(angle) {
@ -241,6 +219,26 @@ var Point = this.Point = Base.extend({
return this;
},
getAngleInRadians: function(point) {
if (point != undefined) {
point = Point.read(arguments);
var div = this.getLength() * point.getLength();
if (div == 0) {
return NaN;
} else {
return Math.acos(this.dot(point) / div);
}
} else {
if (this._angle == null)
this._angle = Math.atan2(this.y, this.x);
return this._angle;
}
},
getAngleInDegrees: function(point) {
return this.getAngle(point);
},
/**
* Returns the angle between two vectors. The angle is directional and
* signed, giving information about the rotational direction.