SGI Developer Toolbox 6.1/SGI Developer Toolbox 6.1 - Disc 4.iso/src/exampleCode/inventor/SpaceballViewer/MyColorWheel.h

C/C++ Source or Header | 1994-08-02 | 6.2 KB | 194 lines

/*
 * Copyright (c) 1990-94 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee, provided
 * that the name of Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Silicon Graphics.
 *
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR ANY SPECIAL, INCIDENTAL,
 * INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, OR ANY DAMAGES WHATSOEVER
 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER OR NOT ADVISED OF THE
 * POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF LIABILITY, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
//  -*- C++ -*-

/*
 * Copyright (C) 1990-93   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.1009 $
 |
 |   Description:
 |    This file contains The MyColorWheel class, which lets you
 |  interactively select colors using a color wheel.
 |
 |   Author(s)    : Alain Dumesny
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */

#ifndef  _SO_XT_COLOR_WHEEL_
#define  _SO_XT_COLOR_WHEEL_

#include <Inventor/SbColor.h>
#include <Inventor/SbLinear.h>
#include <Inventor/misc/SoCallbackList.h>
#include <Inventor/Xt/SoXtGLWidget.h>

class SoXtMouse;

// callback function prototypes
typedef void MyColorWheelCB(void *userData, const float hsv[3]);

//////////////////////////////////////////////////////////////////////////////
//
//  Class: MyColorWheel
//
//    Lets you interactively select colors using a color wheel. User register
//  callback(s) to be notified when a new color has been selected. There is
//  also a call to tell the color wheel what the current color is when it is
//  changed externally.
//
//////////////////////////////////////////////////////////////////////////////

// C-api: prefix=SoXtColWhl
class MyColorWheel : public SoXtGLWidget {

  public:

    MyColorWheel(
    Widget parent = NULL,
    const char *name = NULL,
    SbBool buildInsideParent = TRUE);
    ~MyColorWheel();

    //
    // Routine to tell the color wheel what the current HSV color is.
    //
    // NOTE: if calling setBaseColor() changes the marker position the
    // valueChanged callbacks will be called with the new hsv color.
    //
    // C-api: name=setBaseCol
    void        setBaseColor(const float hsv[3]);
    // C-api: name=getBaseCol
    const float *getBaseColor()         { return hsvColor; }

    //
    // This routine sets the WYSIWYG (What You See Is What You Get) mode.
    // When WYSIWYG is on the colors on the wheel will reflect the current
    // color intensity (i.e. get darker and brighter)
    //
    void    setWYSIWYG(SbBool trueOrFalse);    // default FALSE
    SbBool      isWYSIWYG()             { return WYSIWYGmode; }

    //
    // Those routines are used to register callbacks for the different
    // color wheel actions.
    //
    // NOTE: the start and finish callbacks are only to signal when the mouse
    // goes down and up. No valid callback data is passed (NULL passed).
    //
    // C-api: name=addStartCB
    void    addStartCallback(
            MyColorWheelCB *f,
            void *userData = NULL)
        { startCallbacks->addCallback((SoCallbackListCB *) f, userData); }

    // C-api: name=addValueChangedCB
    void    addValueChangedCallback(
            MyColorWheelCB *f,
            void *userData = NULL)
        { changedCallbacks->addCallback((SoCallbackListCB *) f, userData); }

    // C-api: name=addFinishCB
    void    addFinishCallback(
            MyColorWheelCB *f,
            void *userData = NULL)
        { finishCallbacks->addCallback((SoCallbackListCB *) f, userData); }

    // C-api: name=removeStartCB
    void    removeStartCallback(
            MyColorWheelCB *f,
            void *userData = NULL)
        { startCallbacks->removeCallback((SoCallbackListCB *) f, userData); }

    // C-api: name=removeValueChangedCB
    void    removeValueChangedCallback(
            MyColorWheelCB *f,
            void *userData = NULL)
        { changedCallbacks->removeCallback((SoCallbackListCB *) f, userData); }

    // C-api: name=removeFinishCB
    void    removeFinishCallback(
            MyColorWheelCB *f,
            void *userData = NULL)
        { finishCallbacks->removeCallback((SoCallbackListCB *) f, userData); }


    // true while the color is changing interactively
    SbBool  isInteractive()                     { return interactive; }

  protected:

    // This constructor takes a boolean whether to build the widget now.
    // Subclasses can pass FALSE, then call MyColorWheel::buildWidget()
    // when they are ready for it to be built.
    SoEXTENDER
    MyColorWheel(
    Widget parent,
    const char *name,
    SbBool buildInsideParent,
    SbBool buildNow);

    Widget        buildWidget(Widget parent);

  private:

    // redefine these to do color wheel specific things
    virtual void    redraw();
    virtual void    redrawOverlay();
    virtual void    processEvent(XAnyEvent *anyevent);
    virtual void    initOverlayGraphic();
    virtual void    sizeChanged(const SbVec2s &newSize);

    // color wheels local variables
    SbBool    WYSIWYGmode;
    SbBool    blackMarker;
    float    hsvColor[3];
    short    cx, cy, radius;
    SbColor    *defaultColors, *colors;
    SbVec2f    *geometry;
    SoXtMouse    *mouse;

    // callback variables
    SoCallbackList *startCallbacks;
    SoCallbackList *changedCallbacks;
    SoCallbackList *finishCallbacks;
    SbBool      interactive;

    // routines to make the wheel geometry, colors, draw it....
    void    makeWheelGeometry();
    void    makeWheelColors(SbColor *col, float intensity);
    void    drawWheelSurrounding();
    void    drawWheelColors();
    void    checkMarkerColor();
    void    drawWheelMarker();
    void    moveWheelMarker(short x, short y);

    // this is called by both constructors
    void constructorCommon(SbBool buildNow);
};


#endif  /* _SO_XT_COLOR_WHEEL_ */