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aa87b9699e
The implementation of this got a little funky, because it has to access methods from CanvasState.
84 lines
3.1 KiB
C++
84 lines
3.1 KiB
C++
/*
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* Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Debug.h>
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#include <LibWeb/HTML/Canvas/CanvasState.h>
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namespace Web::HTML {
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// https://html.spec.whatwg.org/multipage/canvas.html#canvastransform
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template<typename IncludingClass>
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class CanvasTransform {
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public:
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~CanvasTransform() = default;
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void scale(float sx, float sy)
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{
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dbgln_if(CANVAS_RENDERING_CONTEXT_2D_DEBUG, "CanvasTransform::scale({}, {})", sx, sy);
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my_drawing_state().transform.scale(sx, sy);
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}
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void translate(float tx, float ty)
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{
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dbgln_if(CANVAS_RENDERING_CONTEXT_2D_DEBUG, "CanvasTransform::translate({}, {})", tx, ty);
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my_drawing_state().transform.translate(tx, ty);
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}
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void rotate(float radians)
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{
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dbgln_if(CANVAS_RENDERING_CONTEXT_2D_DEBUG, "CanvasTransform::rotate({})", radians);
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my_drawing_state().transform.rotate_radians(radians);
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}
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// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-transform
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void transform(double a, double b, double c, double d, double e, double f)
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{
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// 1. If any of the arguments are infinite or NaN, then return.
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if (!isfinite(a) || !isfinite(b) || !isfinite(c) || !isfinite(d) || !isfinite(e) || !isfinite(f))
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return;
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// 2. Replace the current transformation matrix with the result of multiplying the current transformation matrix with the matrix described by:
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// a c e
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// b d f
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// 0 0 1
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my_drawing_state().transform.multiply({ static_cast<float>(a), static_cast<float>(b), static_cast<float>(c), static_cast<float>(d), static_cast<float>(e), static_cast<float>(f) });
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}
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// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-settransform
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void set_transform(double a, double b, double c, double d, double e, double f)
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{
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// 1. If any of the arguments are infinite or NaN, then return.
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if (!isfinite(a) || !isfinite(b) || !isfinite(c) || !isfinite(d) || !isfinite(e) || !isfinite(f))
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return;
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// 2. Reset the current transformation matrix to the identity matrix.
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my_drawing_state().transform = {};
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// 3. Invoke the transform(a, b, c, d, e, f) method with the same arguments.
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transform(a, b, c, d, e, f);
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}
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// https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-resettransform
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void reset_transform()
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{
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// The resetTransform() method, when invoked, must reset the current transformation matrix to the identity matrix.
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my_drawing_state().transform = {};
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}
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protected:
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CanvasTransform() = default;
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private:
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CanvasState::DrawingState& my_drawing_state() { return reinterpret_cast<IncludingClass&>(*this).drawing_state(); }
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CanvasState::DrawingState const& my_drawing_state() const { return reinterpret_cast<IncludingClass const&>(*this).drawing_state(); }
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};
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}
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