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The Transform Matrix has a new method applyInverse which will take an x/y position and inverse translate it through the current matrix.

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This commit is contained in:
Richard Davey 2018-08-29 16:11:59 +01:00
parent 91f7e27ae8
commit e4a7977bb9
1 changed files with 43 additions and 6 deletions
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49
src/gameobjects/components/TransformMatrix.js
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@ -5,6 +5,7 @@
*/
var Class = require('../../utils/Class');
var Vector2 = require('../../math/Vector2');
/**
* @classdesc
@ -419,12 +420,12 @@ var TransformMatrix = new Class({
var destinationMatrix = (out === undefined) ? this : out;
destinationMatrix.a = sourceA * localA + sourceB * localC;
destinationMatrix.b = sourceA * localB + sourceB * localD;
destinationMatrix.c = sourceC * localA + sourceD * localC;
destinationMatrix.d = sourceC * localB + sourceD * localD;
destinationMatrix.e = sourceE * localA + sourceF * localC + localE;
destinationMatrix.f = sourceE * localB + sourceF * localD + localF;
destinationMatrix.a = (sourceA * localA) + (sourceB * localC);
destinationMatrix.b = (sourceA * localB) + (sourceB * localD);
destinationMatrix.c = (sourceC * localA) + (sourceD * localC);
destinationMatrix.d = (sourceC * localB) + (sourceD * localD);
destinationMatrix.e = (sourceE * localA) + (sourceF * localC) + localE;
destinationMatrix.f = (sourceE * localB) + (sourceF * localD) + localF;
return destinationMatrix;
},
@ -802,6 +803,42 @@ var TransformMatrix = new Class({
return this;
},
/**
* Takes the `x` and `y` values and returns a new position in the `output` vector that is the inverse of
* the current matrix with its transformation applied.
*
* Can be used to translate points from world to local space.
*
* @method Phaser.GameObjects.Components.TransformMatrix#applyInverse
* @since 3.12.0
*
* @param {number} x - The x position to translate.
* @param {number} y - The y position to translate.
* @param {Phaser.Math.Vector2} [output] - A Vector2, or point-like object, to store the results in.
*
* @return {Phaser.Math.Vector2} The coordinates, inverse-transformed through this matrix.
*/
applyInverse: function (x, y, output)
{
if (output === undefined) { output = new Vector2(); }
var matrix = this.matrix;
var a = matrix[0];
var b = matrix[1];
var c = matrix[2];
var d = matrix[3];
var tx = matrix[4];
var ty = matrix[5];
var id = 1 / ((a * d) + (c * -b));
output.x = (d * id * x) + (-c * id * y) + (((ty * c) - (tx * d)) * id);
output.y = (a * id * y) + (-b * id * x) + (((-ty * a) + (tx * b)) * id);
return output;
},
/**
* Returns the X component of this matrix multiplied by the given values.
* This is the same as `x * a + y * c + e`.