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comparison: gfx/src/nsTransform2D.h
gfx/src/nsTransform2D.h
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:001244ba3e76 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef nsTransform2D_h___ | |
| 7 #define nsTransform2D_h___ | |
| 8 | |
| 9 #include "gfxCore.h" | |
| 10 #include "nsCoord.h" | |
| 11 | |
| 12 class NS_GFX nsTransform2D | |
| 13 { | |
| 14 private: | |
| 15 /** | |
| 16 * This represents the following matrix (note that the order of row/column | |
| 17 * indices is opposite to usual notation) | |
| 18 * | |
| 19 * / m00 0 m20 \ | |
| 20 * M = | 0 m11 m21 | | |
| 21 * \ 0 0 1 / | |
| 22 * | |
| 23 * Transformation of a coordinate (x, y) is obtained by setting | |
| 24 * v = (x, y, 1)^T and evaluating M . v | |
| 25 **/ | |
| 26 | |
| 27 float m00, m11, m20, m21; | |
| 28 | |
| 29 public: | |
| 30 nsTransform2D(void) { m20 = m21 = 0.0f; m00 = m11 = 1.0f; } | |
| 31 nsTransform2D(nsTransform2D *aTransform2D) { | |
| 32 m00 = aTransform2D->m00; | |
| 33 m11 = aTransform2D->m11; | |
| 34 m20 = aTransform2D->m20; | |
| 35 m21 = aTransform2D->m21; | |
| 36 } | |
| 37 | |
| 38 ~nsTransform2D(void) { } | |
| 39 | |
| 40 /** | |
| 41 * set this transform to a translation | |
| 42 * | |
| 43 * @param tx, x translation | |
| 44 * @param ty, y translation | |
| 45 **/ | |
| 46 | |
| 47 void SetToTranslate(float tx, float ty) { m00 = m11 = 1.0f; m20 = tx; m21 = ty; } | |
| 48 | |
| 49 /** | |
| 50 * get the translation portion of this transform | |
| 51 * | |
| 52 * @param pt, Point to return translation values in | |
| 53 **/ | |
| 54 | |
| 55 void GetTranslationCoord(nscoord *ptX, nscoord *ptY) const { *ptX = NSToCoordRound(m20); *ptY = NSToCoordRound(m21); } | |
| 56 | |
| 57 /** | |
| 58 * apply matrix to vector | |
| 59 * | |
| 60 * @param pt Point to transform | |
| 61 **/ | |
| 62 | |
| 63 void TransformCoord(nscoord *ptX, nscoord *ptY) const; | |
| 64 | |
| 65 /** | |
| 66 * apply matrix to rect | |
| 67 * | |
| 68 * @param rect Rect to transform | |
| 69 **/ | |
| 70 | |
| 71 void TransformCoord(nscoord *aX, nscoord *aY, nscoord *aWidth, nscoord *aHeight) const; | |
| 72 | |
| 73 /** | |
| 74 * add a scale to a Transform via x, y pair | |
| 75 * | |
| 76 * @param ptX x value to add as x scale | |
| 77 * @param ptY y value to add as y scale | |
| 78 **/ | |
| 79 | |
| 80 void AddScale(float ptX, float ptY) { m00 *= ptX; m11 *= ptY; } | |
| 81 | |
| 82 /** | |
| 83 * Set the scale (overriding any previous calls to AddScale, but leaving | |
| 84 * any existing translation). | |
| 85 * | |
| 86 * @param ptX x value to add as x scale | |
| 87 * @param ptY y value to add as y scale | |
| 88 **/ | |
| 89 | |
| 90 void SetScale(float ptX, float ptY) { m00 = ptX; m11 = ptY; } | |
| 91 }; | |
| 92 | |
| 93 #endif |
