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();

    // The important virtuals to implement
    virtual void draw(
        M3dView& view,
        const MDagPath& path,
        M3dView::DisplayStyle style,
        M3dView::DisplayStatus status);

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

    // 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 activeName, topName, rightName, bottomName, leftName;
    // Final draw points (make accessible to draw override)
    friend class squareScaleManipulatorOverride;
    float tl[4], tr[4], br[4], bl[4];
    // Simple class for plane creation, intersection
    planeMath plane;
    // Modified mouse position used for updating manipulator
    MPoint mousePointGlName;
};

//
// Draw override class for drawing manip in VP2.0
//
class squareScaleManipulatorOverride : public MHWRender::MPxDrawOverride
{
public:
    static MHWRender::MPxDrawOverride* Creator(const MObject& obj)
    {
        return new squareScaleManipulatorOverride(obj);
    }

    virtual ~squareScaleManipulatorOverride();

    virtual MHWRender::DrawAPI supportedDrawAPIs() const;

    virtual bool isBounded(
        const MDagPath& objPath,
        const MDagPath& cameraPath) const;

    virtual MBoundingBox boundingBox(
        const MDagPath& objPath,
        const MDagPath& cameraPath) const;

    virtual bool disableInternalBoundingBoxDraw() const;

    virtual MUserData* prepareForDraw(
        const MDagPath& objPath,
        const MDagPath& cameraPath,
        const MHWRender::MFrameContext& frameContext,
        MUserData* oldData);

    static void draw(
        const MHWRender::MDrawContext& context,
        const MUserData* data);

private:
    squareScaleManipulatorOverride(const MObject& obj);
};