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LibGfx: Add a basic AffineTransform class

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We can now perform some basic 2D transforms through an affine matrix.
This patch adds translate() and scale() :^)
This commit is contained in:
Andreas Kling 2020-04-12 19:19:35 +02:00
parent 3bbc2c7300
commit 6f2c63000d
3 changed files with 223 additions and 0 deletions
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74
Libraries/LibGfx/AffineTransform.h Normal file
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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Forward.h>
#include <AK/LogStream.h>
#include <LibGfx/Forward.h>
namespace Gfx {
class AffineTransform {
public:
AffineTransform()
: m_values { 1, 0, 0, 1, 0, 0 }
{
}
bool is_identity() const;
void map(float unmapped_x, float unmapped_y, float& mapped_x, float& mapped_y) const;
Point map(const Point&) const;
FloatPoint map(const FloatPoint&) const;
Size map(const Size&) const;
FloatSize map(const FloatSize&) const;
Rect map(const Rect&) const;
FloatRect map(const FloatRect&) const;
float a() const { return m_values[0]; }
float b() const { return m_values[1]; }
float c() const { return m_values[2]; }
float d() const { return m_values[3]; }
float e() const { return m_values[4]; }
float f() const { return m_values[5]; }
float x_scale() const;
float y_scale() const;
AffineTransform& scale(float sx, float sy);
AffineTransform& translate(float tx, float ty);
private:
float m_values[6] { 0 };
};
const LogStream& operator<<(const LogStream&, const AffineTransform&);
}