JUCE/modules/juce_gui_basics/positioning/juce_RelativePointPath.h

/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
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   Or:

   You may also use this code under the terms of the AGPLv3:
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   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

//==============================================================================
/**
    A path object that consists of RelativePoint coordinates rather than the normal fixed ones.

    One of these paths can be converted into a Path object for drawing and manipulation, but
    unlike a Path, its points can be dynamic instead of just fixed.

    @see RelativePoint, RelativeCoordinate

    @tags{GUI}
*/
class JUCE_API  RelativePointPath
{
public:
    //==============================================================================
    RelativePointPath();
    RelativePointPath (const RelativePointPath&);
    explicit RelativePointPath (const Path& path);
    ~RelativePointPath();

    bool operator== (const RelativePointPath&) const noexcept;
    bool operator!= (const RelativePointPath&) const noexcept;

    //==============================================================================
    /** Resolves this points in this path and adds them to a normal Path object. */
    void createPath (Path& path, Expression::Scope* scope) const;

    /** Returns true if the path contains any non-fixed points. */
    bool containsAnyDynamicPoints() const;

    /** Quickly swaps the contents of this path with another. */
    void swapWith (RelativePointPath&) noexcept;

    //==============================================================================
    /** The types of element that may be contained in this path.
        @see RelativePointPath::ElementBase
    */
    enum ElementType
    {
        nullElement,
        startSubPathElement,
        closeSubPathElement,
        lineToElement,
        quadraticToElement,
        cubicToElement
    };

    //==============================================================================
    /** Base class for the elements that make up a RelativePointPath.
    */
    class JUCE_API  ElementBase
    {
    public:
        ElementBase (ElementType type);
        virtual ~ElementBase() = default;
        virtual void addToPath (Path& path, Expression::Scope*) const = 0;
        virtual RelativePoint* getControlPoints (int& numPoints) = 0;
        virtual ElementBase* clone() const = 0;
        bool isDynamic();

        const ElementType type;

    private:
        JUCE_DECLARE_NON_COPYABLE (ElementBase)
    };

    //==============================================================================
    /** Class for the start sub path element */
    class JUCE_API  StartSubPath  : public ElementBase
    {
    public:
        StartSubPath (const RelativePoint& pos);
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

        RelativePoint startPos;

    private:
        JUCE_DECLARE_NON_COPYABLE (StartSubPath)
    };

    //==============================================================================
    /** Class for the close sub path element */
    class JUCE_API  CloseSubPath  : public ElementBase
    {
    public:
        CloseSubPath();
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

    private:
        JUCE_DECLARE_NON_COPYABLE (CloseSubPath)
    };

    //==============================================================================
    /** Class for the line to element */
    class JUCE_API  LineTo  : public ElementBase
    {
    public:
        LineTo (const RelativePoint& endPoint);
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

        RelativePoint endPoint;

    private:
        JUCE_DECLARE_NON_COPYABLE (LineTo)
    };

    //==============================================================================
    /** Class for the quadratic to element */
    class JUCE_API  QuadraticTo  : public ElementBase
    {
    public:
        QuadraticTo (const RelativePoint& controlPoint, const RelativePoint& endPoint);
        ValueTree createTree() const;
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

        RelativePoint controlPoints[2];

    private:
        JUCE_DECLARE_NON_COPYABLE (QuadraticTo)
    };

    //==============================================================================
    /** Class for the cubic to element */
    class JUCE_API  CubicTo  : public ElementBase
    {
    public:
        CubicTo (const RelativePoint& controlPoint1, const RelativePoint& controlPoint2, const RelativePoint& endPoint);
        ValueTree createTree() const;
        void addToPath (Path& path, Expression::Scope*) const override;
        RelativePoint* getControlPoints (int& numPoints) override;
        ElementBase* clone() const override;

        RelativePoint controlPoints[3];

    private:
        JUCE_DECLARE_NON_COPYABLE (CubicTo)
    };

    //==============================================================================
    void addElement (ElementBase* newElement);

    //==============================================================================
    OwnedArray<ElementBase> elements;
    bool usesNonZeroWinding;

private:
    class Positioner;
    friend class Positioner;
    bool containsDynamicPoints;

    void applyTo (DrawablePath& path) const;

    RelativePointPath& operator= (const RelativePointPath&);
    JUCE_LEAK_DETECTOR (RelativePointPath)
};

} // namespace juce