113 lines
4.1 KiB
C++
113 lines
4.1 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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//==============================================================================
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/**
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Flattens a Path object into a series of straight-line sections.
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Use one of these to iterate through a Path object, and it will convert
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all the curves into line sections so it's easy to render or perform
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geometric operations on.
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@see Path
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@tags{Graphics}
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*/
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class JUCE_API PathFlatteningIterator final
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{
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public:
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//==============================================================================
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/** Creates a PathFlatteningIterator.
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After creation, use the next() method to initialise the fields in the
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object with the first line's position.
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@param path the path to iterate along
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@param transform a transform to apply to each point in the path being iterated
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@param tolerance the amount by which the curves are allowed to deviate from the lines
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into which they are being broken down - a higher tolerance contains
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less lines, so can be generated faster, but will be less smooth.
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*/
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PathFlatteningIterator (const Path& path,
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const AffineTransform& transform = AffineTransform(),
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float tolerance = Path::defaultToleranceForMeasurement);
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/** Destructor. */
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~PathFlatteningIterator();
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//==============================================================================
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/** Fetches the next line segment from the path.
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This will update the member variables x1, y1, x2, y2, subPathIndex and closesSubPath
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so that they describe the new line segment.
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@returns false when there are no more lines to fetch.
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*/
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bool next();
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float x1; /**< The x position of the start of the current line segment. */
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float y1; /**< The y position of the start of the current line segment. */
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float x2; /**< The x position of the end of the current line segment. */
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float y2; /**< The y position of the end of the current line segment. */
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/** Indicates whether the current line segment is closing a sub-path.
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If the current line is the one that connects the end of a sub-path
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back to the start again, this will be true.
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*/
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bool closesSubPath;
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/** The index of the current line within the current sub-path.
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E.g. you can use this to see whether the line is the first one in the
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subpath by seeing if it's 0.
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*/
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int subPathIndex;
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/** Returns true if the current segment is the last in the current sub-path. */
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bool isLastInSubpath() const noexcept;
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private:
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//==============================================================================
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const Path& path;
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const AffineTransform transform;
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const float* source;
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const float toleranceSquared;
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float subPathCloseX = 0, subPathCloseY = 0;
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const bool isIdentityTransform;
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HeapBlock<float> stackBase { 32 };
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float* stackPos;
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size_t stackSize = 32;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (PathFlatteningIterator)
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};
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} // namespace juce
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