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Eliminated or reduced compiler errors and warnings, as tested with
egcs-2.91.66 (on Red Hat 6.0) and gcc 2.96 (on Red Hat 6.2).

/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */

/*
 * Copyright (C) 1991-93   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.2 $
 |
 |   Classes:
 |	MySimpleMaterialEditor
 |
 |   Author(s):	Alain Dumesny
 |
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */

#include <string.h>
#include <math.h>
#include <stdlib.h>

#include <Xm/Text.h>
#include <Xm/Form.h>
#include <Xm/LabelG.h>
#include <Xm/Scale.h>
#include <Xm/PushBG.h>

#include <Inventor/SbLinear.h>
#include <Inventor/SoDB.h>
#include <Inventor/SoInput.h>
#include <Inventor/SoPath.h>
#include <Inventor/SoLists.h>
#include <Inventor/nodes/SoMaterial.h>
#include <Inventor/nodes/SoBaseColor.h>
#include <Inventor/actions/SoGLRenderAction.h>
#include <Inventor/actions/SoSearchAction.h>
#include <Inventor/Xt/SoXtClipboard.h>
#include <Inventor/Xt/SoXtRenderArea.h>
#include <Inventor/errors/SoDebugError.h>

#include "MyColorWheel.h"
#include "MyColorSlider.h"
#include "MySimpleMaterialEditor.h"


/*
 * static vars
 */

static char *geometryBuffer = "\
#Inventor V1.0 ascii\n\
\
Separator { \
    OrthographicCamera { \
	position 0 0 2 \
	nearDistance 1 \
	farDistance 3 \
	height 2 \
    } \
    LightModel { model BASE_COLOR } \
    BaseColor { rgb [.3 .3 .3, .5 .5 .5, .5 .5 .5, .3 .3 .3] } \
    MaterialBinding { value PER_FACE } \
    Coordinate3 { point [ \
	-3 3 0,  0 3 0,  3 3 0, \
	-3 0 0,  0 0 0,  3 0 0, \
	-3 -3 0, 0 -3 0, 3 -3 0 ] \
    } \
    QuadMesh { verticesPerColumn 3 verticesPerRow 3 } \
    LightModel { model PHONG } \
    DirectionalLight { direction .556 -.623 -.551} \
    DirectionalLight { direction -.556 -.623 -.551} \
    Material {} \
    Complexity { value .8 } \
    Sphere { radius .85 } \
} ";


////////////////////////////////////////////////////////////////////////
//
// Public constructor - build the widget right now
//
MySimpleMaterialEditor::MySimpleMaterialEditor(
    Widget parent,
    const char *name, 
    SbBool buildInsideParent, 
    SbBool showName)
	: SoXtComponent(
	    parent,
	    name, 
	    buildInsideParent)
//
////////////////////////////////////////////////////////////////////////
{
    // In this case, this component is what the app wants, so buildNow = TRUE
    constructorCommon(showName, TRUE);
}

////////////////////////////////////////////////////////////////////////
//
// SoEXTENDER constructor - the subclass tells us whether to build or not
//
MySimpleMaterialEditor::MySimpleMaterialEditor(
    Widget parent,
    const char *name, 
    SbBool buildInsideParent, 
    SbBool showName, 
    SbBool buildNow)
	: SoXtComponent(
	    parent,
	    name, 
	    buildInsideParent)
//
////////////////////////////////////////////////////////////////////////
{
    // In this case, this component may be what the app wants, 
    // or it may want a subclass of this component. Pass along buildNow
    // as it was passed to us.
    constructorCommon(showName, buildNow);
}

////////////////////////////////////////////////////////////////////////
//
// Called by the constructors
//
// private
//
void
MySimpleMaterialEditor::constructorCommon(SbBool showName, SbBool buildNow)
//
//////////////////////////////////////////////////////////////////////
{
    // init local vars
    setClassName("MySimpleMaterialEditor");
    materialName = NULL;
    savedMaterialName = NULL;
    savedMaterial = new SoMaterial;
    savedMaterial->ref();
    ignoreCallback = FALSE;
    clipboard = NULL;
    nameVisible = showName;
    
    // init widget vars
    nameField = NULL;
    for (int i=0; i<3; i++)
	sldWidgets[i] = NULL;
    
    renderArea = NULL;
    colWheel = NULL;
    colSlider = NULL;
        
    // Build the widget tree, and let SoXtComponent know about our base widget.
    if (buildNow) {
	Widget w = buildWidget(getParentWidget());
	setBaseWidget(w);
    }
}

////////////////////////////////////////////////////////////////////////
//
//    Destructor.
//
MySimpleMaterialEditor::~MySimpleMaterialEditor()
//
////////////////////////////////////////////////////////////////////////
{
    delete renderArea;
    delete colWheel;
    delete colSlider;
    delete clipboard;
    savedMaterial->unref();
    if (materialName != NULL)
	free(materialName);
    if (savedMaterialName != NULL)
	free(savedMaterialName);
}

////////////////////////////////////////////////////////////////////////
//
// Description:
//  	set the new material
//
// Use: public
void
MySimpleMaterialEditor::setMaterial(const SoMaterial *mtl)
//
////////////////////////////////////////////////////////////////////////
{
    // out with the old...
    copyMaterial(material, mtl);
    
    // update the screen and save the values
    calculateMaterialFactors();
    updateMaterialUI();
    saveMaterialFactors();
}

////////////////////////////////////////////////////////////////////////
//
// Description:
//  	set the new material name
//
// Use: public
void
MySimpleMaterialEditor::setMaterialName(const char *name)
//
////////////////////////////////////////////////////////////////////////
{
    if (! nameVisible)
	return;
    
    // out with the old...
    if (materialName != NULL)
	free(materialName);
    materialName = (name != NULL) ? strdup(name) : NULL;
    
    // save the name
    if (savedMaterialName != NULL)
	free(savedMaterialName);
    savedMaterialName = (materialName != NULL) ? strdup(materialName) : NULL;
    
    // update text field
    if (nameField != NULL) {
	char *str = (materialName != NULL) ? materialName : (char *) "";
	XmTextSetString(nameField, str);
    }
}

////////////////////////////////////////////////////////////////////////
//
// Description:
//  	Buils the editor layout
//
// Use: protected
Widget
MySimpleMaterialEditor::buildWidget(Widget parent)
//
////////////////////////////////////////////////////////////////////////
{
#if 0
    // force the window to resize in fixed increments from the
    // window minimum size. This will guarantee that the color wheel 
    // has a 1/1 aspect ratio.
    int baseHeight = nameVisible ? 275 : 240;
    if ( XtIsShell(parent) )
	XtVaSetValues(parent, 
	    XmNbaseWidth, 210, 
	    XmNbaseHeight, baseHeight, 
	    XmNminAspectX, 2, 
	    XmNmaxAspectX, 2, 
	    XmNminAspectY, 1, 
	    XmNmaxAspectY, 1, 
	    NULL);
#endif
    
    int	n, i;
    Arg	args[12];
    
    // create a top level form to hold everything together
    n = 0;
    XtSetArg(args[n], XmNfractionBase, 100); n++;
    Widget form = XmCreateForm(parent, "", args, n);
    
    // create all the parts
    renderArea = new SoXtRenderArea(form);
    renderArea->setSize(SbVec2s(1, 1)); // col wheel will set the window size
    renderArea->setTransparencyType(SoGLRenderAction::BLEND); // spheres are last
    Widget raWidget = renderArea->getWidget();
    
    colWheel = new MyColorWheel(form);
    colWheel->setSize(SbVec2s(126, 120));
    colWheel->addValueChangedCallback(MySimpleMaterialEditor::colWheelCB, this);
    colWheel->setWYSIWYG(TRUE);
    Widget colWheelWidget = colWheel->getWidget();
    
    colSlider = new MyColorSlider(form, NULL, TRUE, MyColorSlider::VALUE_SLIDER);
    colSlider->setNumericFieldVisible(FALSE);
    colSlider->setSize(SbVec2s(126, 24));
    colSlider->addValueChangedCallback(MySimpleMaterialEditor::colSliderCB, this);
    colSlider->setWYSIWYG(TRUE);    
    Widget colSliderWidget = colSlider->getWidget();

    //
    // read scene graph in
    //
    SoInput in;
    in.setBuffer((void *)geometryBuffer, (size_t) strlen(geometryBuffer));
    SoNode *node;
    SbBool ok = SoDB::read(&in, node);
    if (!ok || node == NULL) {
#ifdef DEBUG
	SoDebugError::post("MySimpleMaterialEditor::buildWidget",
		"couldn't read geometry");
#endif
	exit(1);
    }
    renderArea->setSceneGraph(node);
    
    // search for the material node
    SoSearchAction sa;
    sa.setType(SoMaterial::getClassTypeId());
    sa.apply(node);
    SoFullPath *fullPath = (SoFullPath *) sa.getPath();
    if (fullPath == NULL) {
#ifdef DEBUG
	SoDebugError::post("MySimpleMaterialEditor::buildWidget",
		"couldn't find material node");
#endif
	exit(1);
    }
    material = (SoMaterial *) fullPath->getTail();
    
    // create the slider labels
    Widget sldLabels[6];
    sldLabels[0] = XmCreateLabelGadget(form, "opaque", NULL, 0);
    sldLabels[1] = XmCreateLabelGadget(form, "transp", NULL, 0);
    sldLabels[2] = XmCreateLabelGadget(form, "rough", NULL, 0);
    sldLabels[3] = XmCreateLabelGadget(form, "smooth", NULL, 0);
    sldLabels[4] = XmCreateLabelGadget(form, "plastic", NULL, 0);
    sldLabels[5] = XmCreateLabelGadget(form, "metal", NULL, 0);
    
    // create the sliders
    n = 0;
    XtSetArg(args[n], XmNminimum, 0); n++;
    XtSetArg(args[n], XmNmaximum, 1000); n++;
    XtSetArg(args[n], XmNhighlightThickness, 0); n++;
    XtSetArg(args[n], XmNorientation, XmHORIZONTAL); n++;
    for (i=0; i<3; i++) {
	sldWidgets[i] = XmCreateScale(form, "sld", args, n);
	XtAddCallback(sldWidgets[i], XmNvalueChangedCallback, 
	    (XtCallbackProc) MySimpleMaterialEditor::sldWidgetsCB, (XtPointer) this);
	XtAddCallback(sldWidgets[i], XmNdragCallback, 
	    (XtCallbackProc) MySimpleMaterialEditor::sldWidgetsCB, (XtPointer) this);
    }
    
    // create the text field and label
    Widget fieldLabel;
    if (nameVisible) {
	fieldLabel = XmCreateLabelGadget(form, "Name:", NULL, 0);
	char *str = (materialName != NULL) ? materialName : (char *) "";
	n = 0;
	XtSetArg(args[n], XmNvalue, str); n++;
	XtSetArg(args[n], XmNhighlightThickness, 1); n++;
	nameField = XmCreateText(form, "text", args, n);
	
	fieldChanged = FALSE;
	XtAddCallback(nameField, XmNvalueChangedCallback, 
	    (XtCallbackProc) MySimpleMaterialEditor::fieldChangedCB, (XtPointer) this);
	XtAddCallback(nameField, XmNactivateCallback, 
	    (XtCallbackProc) MySimpleMaterialEditor::nameFieldCB, (XtPointer) this);
	XtAddCallback(nameField, XmNlosingFocusCallback, 
	    (XtCallbackProc) MySimpleMaterialEditor::nameFieldCB, (XtPointer) this);
    }
    
    // create the push buttons
    Widget buttons[4];
    n = 0;
    XtSetArg(args[n], XmNhighlightThickness, 0); n++;
    buttons[0] = XmCreatePushButtonGadget(form, "Apply", args, n);
    buttons[1] = XmCreatePushButtonGadget(form, "Reset", args, n);
    buttons[2] = XmCreatePushButtonGadget(form, "Copy", args, n);
    buttons[3] = XmCreatePushButtonGadget(form, "Paste", args, n);
    XtAddCallback(buttons[0], XmNactivateCallback,
	(XtCallbackProc) MySimpleMaterialEditor::applyCB, (XtPointer) this);
    XtAddCallback(buttons[1], XmNactivateCallback,
	(XtCallbackProc) MySimpleMaterialEditor::resetCB, (XtPointer) this);
    XtAddCallback(buttons[2], XmNactivateCallback,
	(XtCallbackProc) MySimpleMaterialEditor::copyCB, (XtPointer) this);
    XtAddCallback(buttons[3], XmNactivateCallback,
	(XtCallbackProc) MySimpleMaterialEditor::pasteCB, (XtPointer) this);
    
    // makes sure things are up to date
    setMaterial(material);
    
    //
    // Layout
    //
#define SX 3
#define DX 1
    n = 0;
    XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_FORM); n++;
    XtSetArg(args[n], XmNbottomOffset,	    7); n++;
    XtSetArg(args[n], XmNleftAttachment,    XmATTACH_POSITION); n++;
    XtSetArg(args[n], XmNrightAttachment,   XmATTACH_POSITION); n++;
    
    XtSetArg(args[n], XmNleftPosition,	    SX);
    XtSetArg(args[n+1], XmNrightPosition,   25-DX);
    XtSetValues(buttons[0], args, n+2);
    XtSetArg(args[n], XmNleftPosition,	    25+DX);
    XtSetArg(args[n+1], XmNrightPosition,   50-DX);
    XtSetValues(buttons[1], args, n+2);
    XtSetArg(args[n], XmNleftPosition,	    50+DX);
    XtSetArg(args[n+1], XmNrightPosition,   75-DX);
    XtSetValues(buttons[2], args, n+2);
    XtSetArg(args[n], XmNleftPosition,	    75+DX);
    XtSetArg(args[n+1], XmNrightPosition,   100-SX);
    XtSetValues(buttons[3], args, n+2);
    
    if (nameVisible) {
	n = 0;
	XtSetArg(args[n], XmNleftAttachment,    XmATTACH_FORM); n++;
	XtSetArg(args[n], XmNleftOffset,	    5); n++;
	XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_WIDGET); n++;
	XtSetArg(args[n], XmNbottomWidget,	    buttons[0]); n++;
	XtSetArg(args[n], XmNbottomOffset,	    12); n++;
	XtSetValues(fieldLabel, args, n);
	
	n = 0;
	XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_OPPOSITE_WIDGET); n++;
	XtSetArg(args[n], XmNbottomWidget,	    fieldLabel); n++;
	XtSetArg(args[n], XmNbottomOffset,	    -4); n++;
	XtSetArg(args[n], XmNleftAttachment,    XmATTACH_WIDGET); n++;
	XtSetArg(args[n], XmNleftWidget,	    fieldLabel); n++;
	XtSetArg(args[n], XmNleftOffset,	    4); n++;
	XtSetArg(args[n], XmNrightAttachment,   XmATTACH_FORM); n++;
	XtSetArg(args[n], XmNrightOffset,	    5); n++;
	XtSetValues(nameField, args, n);
    }
    
    n = 0;
    XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_WIDGET); n++;
    XtSetArg(args[n], XmNleftAttachment,    XmATTACH_POSITION); n++;
    XtSetArg(args[n], XmNleftPosition,	    30); n++;
    XtSetArg(args[n], XmNrightAttachment,   XmATTACH_POSITION); n++;
    XtSetArg(args[n], XmNrightPosition,	    70); n++;
    
    XtSetArg(args[n], XmNbottomWidget,	    nameVisible ? nameField : buttons[0]);
    XtSetArg(args[n+1], XmNbottomOffset,    10);
    XtSetValues(sldWidgets[0], args, n+2);
    XtSetArg(args[n], XmNbottomWidget,	    sldWidgets[0]);
    XtSetArg(args[n+1], XmNbottomOffset,    6);
    XtSetValues(sldWidgets[1], args, n+2);
    XtSetArg(args[n], XmNbottomWidget,	    sldWidgets[1]);
    XtSetValues(sldWidgets[2], args, n+2);
    
    n = 0;
    XtSetArg(args[n], XmNrightAttachment,   XmATTACH_WIDGET); n++;
    XtSetArg(args[n], XmNrightOffset,	    5); n++;
    XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_OPPOSITE_WIDGET); n++;
    for (i=0; i<3; i++) {
	XtSetArg(args[n], XmNrightWidget,   sldWidgets[i]);
	XtSetArg(args[n+1], XmNbottomWidget, sldWidgets[i]);
	XtSetValues(sldLabels[i*2], args, n+2);
    }
    
    n = 0;
    XtSetArg(args[n], XmNleftAttachment,    XmATTACH_WIDGET); n++;
    XtSetArg(args[n], XmNleftOffset,	    5); n++;
    XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_OPPOSITE_WIDGET); n++;
    for (i=0; i<3; i++) {
	XtSetArg(args[n], XmNleftWidget,    sldWidgets[i]);
	XtSetArg(args[n+1], XmNbottomWidget, sldWidgets[i]);
	XtSetValues(sldLabels[i*2 + 1], args, n+2);
    }
    
    n = 0;
    XtSetArg(args[n], XmNleftAttachment,    XmATTACH_FORM); n++;
    XtSetArg(args[n], XmNleftOffset,	    5); n++;
    XtSetArg(args[n], XmNtopAttachment,	    XmATTACH_FORM); n++;
    XtSetArg(args[n], XmNtopOffset,	    5); n++;
    XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_WIDGET); n++;
    XtSetArg(args[n], XmNbottomWidget,	    sldWidgets[2]); n++;
    XtSetArg(args[n], XmNbottomOffset,	    10); n++;
    XtSetArg(args[n], XmNrightAttachment,   XmATTACH_POSITION); n++;
    XtSetArg(args[n], XmNrightPosition,	    50); n++;
    XtSetValues(raWidget, args, n);
    
    n = 0;
    XtSetArg(args[n], XmNleftAttachment,    XmATTACH_POSITION); n++;
    XtSetArg(args[n], XmNleftPosition,	    50); n++;
    XtSetArg(args[n], XmNleftOffset,	    4); n++;
    XtSetArg(args[n], XmNrightAttachment,   XmATTACH_FORM); n++;
    XtSetArg(args[n], XmNrightOffset,	    5); n++;
    XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_OPPOSITE_WIDGET); n++;
    XtSetArg(args[n], XmNbottomWidget,	    raWidget); n++;
    XtSetValues(colSliderWidget, args, n);
    
    n = 0;
    XtSetArg(args[n], XmNleftAttachment,    XmATTACH_POSITION); n++;
    XtSetArg(args[n], XmNleftPosition,	    50); n++;
    XtSetArg(args[n], XmNleftOffset,	    4); n++;
    XtSetArg(args[n], XmNbottomAttachment,  XmATTACH_WIDGET); n++;
    XtSetArg(args[n], XmNbottomWidget,	    colSliderWidget); n++;
    XtSetArg(args[n], XmNrightAttachment,   XmATTACH_FORM); n++;
    XtSetArg(args[n], XmNrightOffset,	    5); n++;
    XtSetArg(args[n], XmNtopAttachment,	    XmATTACH_FORM); n++;
    XtSetArg(args[n], XmNtopOffset,	    5); n++;
    XtSetValues(colWheelWidget, args, n);
    
    
    // manage those children
    XtManageChildren(buttons, 4);
    if (nameVisible) {
	XtManageChild(fieldLabel);
	XtManageChild(nameField);
    }
    XtManageChildren(sldWidgets, 3);
    XtManageChildren(sldLabels, 6);
    XtManageChild(raWidget);
    XtManageChild(colSliderWidget);
    XtManageChild(colWheelWidget);
    
    return form;
}

////////////////////////////////////////////////////////////////////////
//
// Description:
//  	copies material2 onto material1
//
// Use: private
void
MySimpleMaterialEditor::copyMaterial(SoMaterial *mat1, const SoMaterial *mat2)
//
////////////////////////////////////////////////////////////////////////
{
    mat1->ambientColor = mat2->ambientColor[0];
    mat1->diffuseColor = mat2->diffuseColor[0];
    mat1->specularColor = mat2->specularColor[0];
    mat1->emissiveColor = mat2->emissiveColor[0];
    mat1->shininess = mat2->shininess[0];
    mat1->transparency = mat2->transparency[0];
}

////////////////////////////////////////////////////////////////////////
//
// Description:
//  	saves the material factors for later reset.
//
// Use: private
void
MySimpleMaterialEditor::saveMaterialFactors()
//
////////////////////////////////////////////////////////////////////////
{
    copyMaterial(savedMaterial, material);
    savedMetalness = metalness;
    savedSmoothness = smoothness;
    savedBaseColor = baseColor;
}

#define AMB_FACT 0.25
#define SHIN_FACT 1.2

////////////////////////////////////////////////////////////////////////
//
// Description:
//  	update the material node based on the current mat factors.
//
// Use: private
void
MySimpleMaterialEditor::updateMaterial()
//
////////////////////////////////////////////////////////////////////////
{
    float trnsp = material->transparency[0];
    float smooth = smoothness * 0.8;
    float rd = (1.0 - smooth) * (1.0 - trnsp);
    SbVec3f vecOne(1, 1, 1);
    
    material->diffuseColor = (baseColor * rd * (1.0 - metalness * smooth)).getValue();
    material->ambientColor = AMB_FACT * material->diffuseColor[0];
    material->specularColor = (1.0 - trnsp - rd) * (vecOne + metalness * 
	(baseColor - vecOne));
    material->shininess = powf(smoothness, SHIN_FACT);
}

////////////////////////////////////////////////////////////////////////
//
// Description:
//  	given the current material, figure the best metalness and 
//  smoothness factors which represent it.
//
// Use: private
void
MySimpleMaterialEditor::calculateMaterialFactors()
//
////////////////////////////////////////////////////////////////////////
{
    // given that 
    //	    shin = smooth ^ SHIN_FACT;
    //
    smoothness = powf(material->shininess[0], 1.0 / SHIN_FACT);
    
    // make a best guess at what the baseColor could be
    // based on the diffuse color.
    baseColor = material->diffuseColor[0];
    float hsv[3];
    baseColor.getHSVValue(hsv);
    hsv[2] = 1;   // scale intensity all the way
    baseColor.setHSVValue(hsv);
    
    // now find the metalness based on the object specular
    // color, given that
    //	    spec = (1 - trnsp - rd) * (1 + met * (color -1))
    //
    float trnsp = material->transparency[0];
    float smooth = smoothness * 0.8;
    float rd = (1 - smooth) * (1 - trnsp);
    float A = (1 - trnsp - rd);
    if (A != 0) {
	// get the metalness by averaging the values found for r,g and b
	int num = 0;
	float met = 0.0;
	SbColor spec = material->specularColor[0];
	for (int i=0; i<3; i++)
	    if (baseColor[i] != 1 && spec[0] != A) {
		met += (spec[0] - A) / (A * (baseColor[i] - 1)) ;
		num++;
	    }
	if (num != 0)
	    metalness = met / num;
	else
	    metalness = 0;
    }
    else
	metalness = 0;
    
    if (metalness < 0)
	metalness = 0;
    else if (metalness > 1)
	metalness = 1;
}

////////////////////////////////////////////////////////////////////////
//
// Description:
//  	updates the color wheel, color slider and motif sliders to the
//  current material.
//
// Use: private
void
MySimpleMaterialEditor::updateMaterialUI()
//
////////////////////////////////////////////////////////////////////////
{
    // if nothing built, return (they will be updated when built)
    if (sldWidgets[0] == NULL)
	return;
    
    // update the metal/smooth/transp sliders
    int val = (int) (metalness * 1000);
    XmScaleSetValue(sldWidgets[2], val);
    val = (int) (smoothness * 1000);
    XmScaleSetValue(sldWidgets[1], val);
    val = (int) (material->transparency[0] * 1000);
    XmScaleSetValue(sldWidgets[0], val);
    
    // update color slider and color wheel
    float hsv[3];
    baseColor.getHSVValue(hsv);
    ignoreCallback = TRUE;
    colWheel->setBaseColor(hsv);
    colSlider->setBaseColor(hsv);
    ignoreCallback = FALSE;
}

//
// redefine those generic virtual functions
//
const char *
MySimpleMaterialEditor::getDefaultWidgetName() const
{ return "MySimpleMaterialEditor"; }

const char *
MySimpleMaterialEditor::getDefaultTitle() const
{ return "Simple Material Editor"; }

const char *
MySimpleMaterialEditor::getDefaultIconTitle() const
{ return "Mat Editor"; }




//
////////////////////////////////////////////////////////////////////////
// static callbacks stubs
////////////////////////////////////////////////////////////////////////
//


//
// called by the color wheel when the color changes
//
void
MySimpleMaterialEditor::colWheelCB(void *pt, const float hsv[3])
{
    MySimpleMaterialEditor *p = (MySimpleMaterialEditor *)pt;
    if (p->ignoreCallback)
	return;
    
    // convert to rgb and update slider and material
    p->baseColor.setHSVValue(hsv);
    
    p->ignoreCallback = TRUE;
    p->colSlider->setBaseColor(hsv);
    p->ignoreCallback = FALSE;
    
    p->updateMaterial();
}

//
// called by color slider when the color changes
//
void
MySimpleMaterialEditor::colSliderCB(void *pt, float)
{
    MySimpleMaterialEditor *p = (MySimpleMaterialEditor *)pt;
    if (p->ignoreCallback)
	return;
    
    // assign new color, update color wheel and material
    const float *hsv = p->colSlider->getBaseColor();
    p->baseColor.setHSVValue(hsv);
    
    p->ignoreCallback = TRUE;
    p->colWheel->setBaseColor(hsv);
    p->ignoreCallback = FALSE;
    
    p->updateMaterial();
}

//
// called by the XmNvalueChangedCallback. This sets a flag for later use
//
void
MySimpleMaterialEditor::fieldChangedCB(Widget, MySimpleMaterialEditor *p, void *)
{
    p->fieldChanged = TRUE;
}

//
// called whenever the use types a new material name
//
void
MySimpleMaterialEditor::nameFieldCB(Widget w, MySimpleMaterialEditor *p, void *)
{
    if (! p->fieldChanged)
	return;
    p->fieldChanged = FALSE;
    
    // get the new material name
    char *str = XmTextGetString(w);
    if (p->materialName != NULL)
	free(p->materialName);
    p->materialName = (str[0] != '\0') ? strdup(str) : NULL;
    XtFree(str);
    
    // make the text field loose the focus
    XmProcessTraversal(XtParent(w), XmTRAVERSE_CURRENT);
}

//
// called whenever any of the three sliders (metal, smooth, transp)
// changes values.
//
void
MySimpleMaterialEditor::sldWidgetsCB(Widget sld, MySimpleMaterialEditor *p, void *)
{
    // get the slider new value
    int v;
    XmScaleGetValue(sld, &v);
    float val = v / 1000.0;
    
    //
    // now update the material based on which slider changed
    //
    
    if (sld == p->sldWidgets[2]) {
	// metalness has changed
	p->metalness = val;
	p->updateMaterial();
    }
    else if (sld == p->sldWidgets[1]) {
	// smothness has changed
	p->smoothness = val;
	p->updateMaterial();
    }
    else {
	// transparency has changed
	p->material->transparency = val;
    }
}

//
// called whenever the apply push button gets pressed
//
void
MySimpleMaterialEditor::applyCB(Widget, MySimpleMaterialEditor *p, void *)
{
    p->callbackList.invokeCallbacks((void *)p);
    
    p->saveMaterialFactors();
    
    // save material name
    if (p->savedMaterialName != NULL)
	free(p->savedMaterialName);
    p->savedMaterialName = (p->materialName != NULL) ? strdup(p->materialName) : NULL;
}

//
// called whenever the reset push button gets pressed
//
void
MySimpleMaterialEditor::resetCB(Widget, MySimpleMaterialEditor *p, void *)
{
    //
    // reset the material factors
    //
    p->copyMaterial(p->material, p->savedMaterial);
    p->metalness = p->savedMetalness;
    p->smoothness = p->savedSmoothness;
    p->baseColor = p->savedBaseColor;
    
    p->updateMaterialUI();
    
    //
    // reset the material name
    //
    if (p->materialName != NULL)
	free(p->materialName);
    p->materialName = (p->savedMaterialName != NULL) ? strdup(p->savedMaterialName) : NULL;
    // update text field
    if (p->nameField != NULL) {
	char *str = (p->materialName != NULL) ? p->materialName : (char *) "";
	XmTextSetString(p->nameField, str);
    }
}

//
// called whenever the copy push button gets pressed
//
void
MySimpleMaterialEditor::copyCB(Widget, MySimpleMaterialEditor *p, XmAnyCallbackStruct *cb)
{
    if (p->clipboard == NULL)
	p->clipboard = new SoXtClipboard(p->getWidget());
    
    //
    // copy the material and also copy the current color (from the
    // wheel) to enable pasting into the color editor.
    //
    
    // construct a path list which has the Material and BaseColor nodes
    SoBaseColor *color = new SoBaseColor;
    color->rgb.setValue(p->baseColor);
    SoPathList *pathList = new SoPathList(2);
    SoPath *path1 = new SoPath(p->material);
    SoPath *path2 = new SoPath(color);
    path1->ref();
    path2->ref();
    pathList->append(path1);
    pathList->append(path2);
    
    Time eventTime = cb->event->xbutton.time;
    p->clipboard->copy(pathList, eventTime);
    
    // delete the paths and the list    color->unref();
    path1->unref();
    path2->unref();
    delete pathList;
}

//
// called whenever the paste push button gets pressed
//
void
MySimpleMaterialEditor::pasteCB(Widget, MySimpleMaterialEditor *p, XmAnyCallbackStruct *cb)
{
    if (p->clipboard == NULL)
	p->clipboard = new SoXtClipboard(p->getWidget());
    
    Time eventTime = cb->event->xbutton.time;
    p->clipboard->paste(eventTime, MySimpleMaterialEditor::pasteDone, p);
}

//
// called whenever the X server is done doing the paste
//
void
MySimpleMaterialEditor::pasteDone(void *pt, SoPathList *pathList)
{
    MySimpleMaterialEditor *p = (MySimpleMaterialEditor *)pt;
    
    SoSearchAction sa;
    SoFullPath *fullPath = NULL;
    
    //
    // search for first material in that pasted scene
    //
    sa.setType(SoMaterial::getClassTypeId());
    for (int i=0; i < pathList->getLength(); i++) {
	sa.apply( (*pathList)[i] );
	if ( (fullPath = (SoFullPath *) sa.getPath()) != NULL) {
	    
	    // assign new material
	    p->copyMaterial(p->material, (SoMaterial *) fullPath->getTail());
	    p->calculateMaterialFactors();
	    p->updateMaterialUI();
	    
	    break;
	}
    }
    
    //
    // else search for the first base color in the scene, which will
    // be used for the color wheel.
    //
    if (fullPath == NULL) {
	sa.setType(SoBaseColor::getClassTypeId());
	for (int i=0; i < pathList->getLength(); i++) {
	    sa.apply( (*pathList)[i] );
	    if ( (fullPath = (SoFullPath *) sa.getPath()) != NULL) {
		
		// assign new color, update color UI + material
		float hsv[3];
		SoBaseColor *node = (SoBaseColor *) fullPath->getTail();
		p->baseColor = node->rgb[0];
		p->baseColor.getHSVValue(hsv);
		
		p->ignoreCallback = TRUE;
		p->colSlider->setBaseColor(hsv);
		p->colWheel->setBaseColor(hsv);
		p->ignoreCallback = FALSE;
		
		p->updateMaterial();
		
		break;
	    }
	}
    }
    
    // ??? We delete the callback data when done with it.
    delete pathList;
}