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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_TRANSFORM_H_
#define UI_GFX_TRANSFORM_H_
#pragma once
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "third_party/skia/include/core/SkMatrix.h"
namespace gfx {
class Point;
class Rect;
}
namespace ui {
// 3x3 transformation matrix. Transform is cheap and explicitly allows
// copy/assign.
// TODO: make this a 4x4.
class Transform {
public:
Transform();
~Transform();
// NOTE: The 'Set' functions overwrite the previously set transformation
// parameters. The 'Concat' functions apply a transformation (e.g. rotation,
// scale, translate) on top of the existing transforms, instead of overwriting
// them.
// NOTE: The order of the 'Set' function calls do not matter. However, the
// order of the 'Concat' function calls do matter, especially when combined
// with the 'Set' functions.
// Sets the rotation of the transformation.
void SetRotate(float degree);
// Sets the scaling parameters.
void SetScaleX(float x);
void SetScaleY(float y);
void SetScale(float x, float y);
// Sets the translation parameters.
void SetTranslateX(float x);
void SetTranslateY(float y);
void SetTranslate(float x, float y);
// Applies rotation on the current transformation.
void ConcatRotate(float degree);
// Applies scaling on current transform.
void ConcatScale(float x, float y);
// Applies translation on current transform.
void ConcatTranslate(float x, float y);
// Applies a transformation on the current transformation
// (i.e. 'this = this * transform;'). Returns true if the result can be
// represented.
bool PreconcatTransform(const Transform& transform);
// Applies a transformation on the current transformation
// (i.e. 'this = transform * this;'). Returns true if the result can be
// represented.
bool ConcatTransform(const Transform& transform);
// Does the transformation change anything?
bool HasChange() const;
// Applies the transformation on the point. Returns true if the point is
// transformed successfully.
bool TransformPoint(gfx::Point* point) const;
// Applies the reverse transformation on the point. Returns true if the point
// is transformed successfully.
bool TransformPointReverse(gfx::Point* point) const;
// Applies transformation on the rectangle. Returns true if the rectangle is
// transformed successfully.
bool TransformRect(gfx::Rect* rect) const;
// Applies the reverse transformation on the rectangle. Returns true if the
// rectangle is transformed successfully.
bool TransformRectReverse(gfx::Rect* rect) const;
// Returns the underlying matrix.
const SkMatrix& matrix() const { return matrix_; }
SkMatrix& matrix() { return matrix_; }
private:
SkMatrix matrix_;
// copy/assign are allowed.
};
} // namespace ui
#endif // UI_GFX_TRANSFORM_H_
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