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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() {}
// Create an object that implements this interface (e.g. using skia
// transformation matrices).
static Transform* Create();
// Set the rotation of the transformation.
virtual void SetRotate(float degree) = 0;
// Set the scaling parameters.
virtual void SetScaleX(float x) = 0;
virtual void SetScaleY(float y) = 0;
virtual void SetScale(float x, float y) = 0;
// Set the translation parameters.
virtual void SetTranslateX(float x) = 0;
virtual void SetTranslateY(float y) = 0;
virtual void SetTranslate(float x, float y) = 0;
// Apply rotation on the current transformation.
virtual void ConcatRotate(float degree) = 0;
// Apply scaling on current transform.
virtual void ConcatScale(float x, float y) = 0;
// Apply translation on current transform.
virtual void ConcatTranslate(float x, float y) = 0;
// Apply a transformation on the current transformation
// (i.e. 'this = this * transform;')
virtual bool ConcatTransform(const Transform& transform) = 0;
// Does the transformation change anything?
virtual bool HasChange() const = 0;
// Apply the transformation on the point.
virtual bool TransformPoint(gfx::Point* point) = 0;
// Apply the reverse transformation on the point.
virtual bool TransformPointReverse(gfx::Point* point) = 0;
// Apply transformatino on the rectangle.
virtual bool TransformRect(gfx::Rect* rect) = 0;
};
} // namespace ui
#endif // UI_GFX_TRANSFORM_H_
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