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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
namespace gfx {
class Point;
class Rect;
}
namespace ui {
// Transformation interface.
// Classes implement this interface to apply transformations (e.g. rotation,
// scaling etc.) on UI components.
class Transform {
public:
virtual ~Transform() {}
// Creates an object that implements this interface (e.g. using skia
// transformation matrices).
static Transform* Create();
// 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.
virtual void SetRotate(float degree) = 0;
// Sets the scaling parameters.
virtual void SetScaleX(float x) = 0;
virtual void SetScaleY(float y) = 0;
virtual void SetScale(float x, float y) = 0;
// Sets the translation parameters.
virtual void SetTranslateX(float x) = 0;
virtual void SetTranslateY(float y) = 0;
virtual void SetTranslate(float x, float y) = 0;
// Applies rotation on the current transformation.
virtual void ConcatRotate(float degree) = 0;
// Applies scaling on current transform.
virtual void ConcatScale(float x, float y) = 0;
// Applies translation on current transform.
virtual void ConcatTranslate(float x, float y) = 0;
// Applies a transformation on the current transformation
// (i.e. 'this = this * transform;'). Returns true if the result can be
// represented.
virtual bool ConcatTransform(const Transform& transform) = 0;
// Does the transformation change anything?
virtual bool HasChange() const = 0;
// Applies the transformation on the point. Returns true if the point is
// transformed successfully.
virtual bool TransformPoint(gfx::Point* point) = 0;
// Applies the reverse transformation on the point. Returns true if the point
// is transformed successfully.
virtual bool TransformPointReverse(gfx::Point* point) = 0;
// Applies transformation on the rectangle. Returns true of the rectangle is
// transformed successfully.
virtual bool TransformRect(gfx::Rect* rect) = 0;
};
} // namespace ui
#endif // UI_GFX_TRANSFORM_H_
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