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Add optional parameter 'squared' to Point#getLength() and #getDistance().

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This commit is contained in:
Jürg Lehni 2011-07-30 11:36:28 +01:00
parent dcccc39dcb
commit 293399e5b9
1 changed files with 14 additions and 7 deletions
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21
src/basic/Point.js
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@ -390,7 +390,7 @@ var Point = this.Point = Base.extend(/** @lends Point# */{
* is not modified!
*
* @param {Matrix} matrix
* @return {Point} the transformed point
* @return {Point} The transformed point
*/
transform: function(matrix) {
return matrix ? matrix._transformPoint(this) : this;
@ -402,13 +402,16 @@ var Point = this.Point = Base.extend(/** @lends Point# */{
* Returns the distance between the point and another point.
*
* @param {Point} point
* @param {Boolean} squared Controls whether the distance should remain
* squared, or its square root should be calculated.
* @return {Number}
*/
getDistance: function(point) {
getDistance: function(point, squared) {
point = Point.read(arguments);
var x = point.x - this.x,
y = point.y - this.y;
return Math.sqrt(x * x + y * y);
y = point.y - this.y,
d = x * x + y * y;
return squared ? d : Math.sqrt(d);
},
/**
@ -421,7 +424,11 @@ var Point = this.Point = Base.extend(/** @lends Point# */{
* @bean
*/
getLength: function() {
return Math.sqrt(this.x * this.x + this.y * this.y);
// Supports a hidden parameter 'squared', which controls whether the
// squared length should be returned. Hide it so it produces a bean
// property called #length.
var l = this.x * this.x + this.y * this.y;
return arguments[0] ? l : Math.sqrt(l);
},
setLength: function(length) {
@ -453,8 +460,8 @@ var Point = this.Point = Base.extend(/** @lends Point# */{
* {@code length} parameter defines the length to normalize to.
* The object itself is not modified!
*
* @param {Number} [length=1] the length of the normalized vector
* @return {Point} the normalized vector of the vector that is represented
* @param {Number} [length=1] The length of the normalized vector
* @return {Point} The normalized vector of the vector that is represented
* by this point's coordinates.
*/
normalize: function(length) {