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1 // Copyright 2012 The Chromium Authors. All rights reserved. | 1 // Copyright 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "config.h" | 5 #include "config.h" |
6 | 6 |
7 #include "CCMathUtil.h" | 7 #include "CCMathUtil.h" |
8 | 8 |
9 #include "FloatPoint.h" | 9 #include "FloatPoint.h" |
10 #include "FloatQuad.h" | 10 #include "FloatQuad.h" |
11 #include "IntRect.h" | 11 #include "IntRect.h" |
12 #include <math.h> | |
12 #include <public/WebTransformationMatrix.h> | 13 #include <public/WebTransformationMatrix.h> |
13 | 14 |
14 using WebKit::WebTransformationMatrix; | 15 using WebKit::WebTransformationMatrix; |
15 | 16 |
16 namespace cc { | 17 namespace cc { |
17 | 18 |
18 static HomogeneousCoordinate projectHomogeneousPoint(const WebTransformationMatr ix& transform, const FloatPoint& p) | 19 static HomogeneousCoordinate projectHomogeneousPoint(const WebTransformationMatr ix& transform, const FloatPoint& p) |
19 { | 20 { |
20 // In this case, the layer we are trying to project onto is perpendicular to ray | 21 // In this case, the layer we are trying to project onto is perpendicular to ray |
21 // (point p and z-axis direction) that we are trying to project. This happen s when the | 22 // (point p and z-axis direction) that we are trying to project. This happen s when the |
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369 return rad2deg(acosf(dotProduct)); | 370 return rad2deg(acosf(dotProduct)); |
370 } | 371 } |
371 | 372 |
372 FloatSize CCMathUtil::projectVector(const FloatSize& source, const FloatSize& de stination) | 373 FloatSize CCMathUtil::projectVector(const FloatSize& source, const FloatSize& de stination) |
373 { | 374 { |
374 float sourceDotDestination = source.width() * destination.width() + source.h eight() * destination.height(); | 375 float sourceDotDestination = source.width() * destination.width() + source.h eight() * destination.height(); |
375 float projectedLength = sourceDotDestination / destination.diagonalLengthSqu ared(); | 376 float projectedLength = sourceDotDestination / destination.diagonalLengthSqu ared(); |
376 return FloatSize(projectedLength * destination.width(), projectedLength * de stination.height()); | 377 return FloatSize(projectedLength * destination.width(), projectedLength * de stination.height()); |
377 } | 378 } |
378 | 379 |
380 float CCMathUtil::distanceBetweenPoints(const FloatPoint& p1, const FloatPoint& p2) | |
381 { | |
382 return sqrtf(fabs(p1.x() - p2.x()) * fabs(p1.x() - p2.x()) + fabs(p1.y() - p 2.y()) * fabs(p1.y() - p2.y())); | |
piman
2012/09/17 23:53:37
nit: no needs for fabs here. x² == |x|²
danakj
2012/09/17 23:55:05
o right :) thanks.
| |
383 } | |
384 | |
379 } // namespace cc | 385 } // namespace cc |
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