squareScaleManip/squareScaleManip.h

//-
// ==========================================================================
// Copyright 1995,2006,2008 Autodesk, Inc. All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk
// license agreement provided at the time of installation or download,
// or which otherwise accompanies this software in either electronic
// or hard copy form.
// ==========================================================================
//+

#include <maya/MTypeId.h>
#include <maya/MTypes.h>
#include <maya/MPxManipulatorNode.h>
#include <maya/MFnPlugin.h>
#include <maya/MObjectHandle.h>
#include <maya/MPxCommand.h>
#include <maya/MSyntax.h>
#include <maya/MDagModifier.h>
#include <maya/MPxDrawOverride.h>
#include <maya/M3dView.h>
#include <maya/MPoint.h>
#include <maya/MGLFunctionTable.h>

#include "manipulatorMath.h"

//
// Custom manipulator class
//
class squareScaleManipulator : public MPxManipulatorNode
{
public:
    squareScaleManipulator();
    ~squareScaleManipulator() override;
    void postConstructor() override;

    // The important virtuals to implement
    void preDrawUI( const M3dView &view ) override;
    void drawUI(MHWRender::MUIDrawManager& drawManager, const MHWRender::MFrameContext& frameContext) const override;

    MStatus doPress(M3dView& view) override;
    MStatus doDrag(M3dView& view) override;
    MStatus doRelease(M3dView& view) override;

    // Utility methods
    MStatus updateDragInformation();

    // Standard API required methods
    static void* creator();
    static MStatus initialize();

    // Node id
    static MTypeId id;
    static MString classification;
    static MString registrantId;

    // Base points for manip
    static const MPoint topLeft;
    static const MPoint topRight;
    static const MPoint bottomLeft;
    static const MPoint bottomRight;

private:
    bool shouldDraw(const MDagPath& camera) const;

    // GL component names for drawing and picking
    MGLuint fActiveName, fTopName, fRightName, fBottomName, fLeftName;
    // Final draw points
    float fTopLeft[4], fTopRight[4], fBottomRight[4], fBottomLeft[4];
    // Simple class for plane creation, intersection
    planeMath fPlane;
    // Modified mouse position used for updating manipulator
    MPoint fMousePoint;

    bool fDrawManip;
};