// @(#)root/gl:$Name: $:$Id: TGLScaleManip.cxx,v 1.6 2006/01/30 17:42:06 rdm Exp $
// Author: Richard Maunder 16/09/2005
/*************************************************************************
* Copyright (C) 1995-2005, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#include "TGLScaleManip.h"
#include "TGLPhysicalShape.h"
#include "TGLCamera.h"
#include "TGLIncludes.h"
//////////////////////////////////////////////////////////////////////////
// //
// TGLScaleManip //
// //
// Scale manipulator - attaches to physical shape and draws local axes //
// widgets with box heads. User can mouse over (turns yellow) and L //
// click/drag to scale along this axis. //
// Widgets use standard 3D package axes colours: X red, Y green, Z blue.//
//////////////////////////////////////////////////////////////////////////
ClassImp(TGLScaleManip)
//______________________________________________________________________________
TGLScaleManip::TGLScaleManip()
{
// Construct scale manipulator not bound to any physical shape.
}
//______________________________________________________________________________
TGLScaleManip::TGLScaleManip(TGLPhysicalShape * shape) :
TGLManip(shape)
{
// Construct scale manipulator bound to TGLPhysicalShape 'shape'.
}
//______________________________________________________________________________
TGLScaleManip::~TGLScaleManip()
{
// Destory the scale manipulator
}
//______________________________________________________________________________
void TGLScaleManip::Draw(const TGLCamera & camera) const
{
// Draw scale manipulator - tubes with box heads, in local axes of
// attached shape, in red(X), green(Y) and blue(Z), with white center sphere.
// If selected widget (mouse over) this is drawn in active colour (yellow).
if (!fShape) {
return;
}
// Get draw scales
const TGLBoundingBox & box = fShape->BoundingBox();
Double_t baseScale;
TGLVector3 axisScale[3];
CalcDrawScale(box, camera, baseScale, axisScale);
// Get permitted manipulations on shape
TGLPhysicalShape::EManip manip = fShape->GetManip();
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_CULL_FACE);
// Draw three axis widgets out of bounding box where permitted
// Not drawing will prevent interaction
// GL name loading for hit testing - 0 reserved for no selection
if (manip & TGLPhysicalShape::kScaleX) {
glPushName(1);
TGLUtil::DrawLine(box.Center(), axisScale[0], TGLUtil::kLineHeadBox,
baseScale, fSelectedWidget == 1 ? fgYellow : fgRed);
glPopName();
} else {
TGLUtil::DrawLine(box.Center(), axisScale[0], TGLUtil::kLineHeadBox,
baseScale, fgGrey);
}
if (manip & TGLPhysicalShape::kScaleY) {
glPushName(2);
TGLUtil::DrawLine(box.Center(), axisScale[1], TGLUtil::kLineHeadBox,
baseScale, fSelectedWidget == 2 ? fgYellow : fgGreen);
glPopName();
} else {
TGLUtil::DrawLine(box.Center(), axisScale[1], TGLUtil::kLineHeadBox,
baseScale, fgGrey);
}
if (manip & TGLPhysicalShape::kScaleZ) {
glPushName(3);
TGLUtil::DrawLine(box.Center(), axisScale[2], TGLUtil::kLineHeadBox,
baseScale, fSelectedWidget == 3 ? fgYellow : fgBlue);
glPopName();
} else {
TGLUtil::DrawLine(box.Center(), axisScale[2], TGLUtil::kLineHeadBox,
baseScale, fgGrey);
}
// Draw white center sphere
TGLUtil::DrawSphere(box.Center(), baseScale/2.0, fgWhite);
glEnable(GL_CULL_FACE);
glDisable(GL_BLEND);
}
//______________________________________________________________________________
Bool_t TGLScaleManip::HandleButton(const Event_t & event, const TGLCamera & camera)
{
// Handle mouse button event over manipulator - returns kTRUE if redraw required
// kFALSE otherwise.
if (event.fType == kButtonPress && fSelectedWidget != 0) {
fStartScale = fShape->GetScale();
}
return TGLManip::HandleButton(event, camera);
}
//______________________________________________________________________________
Bool_t TGLScaleManip::HandleMotion(const Event_t & event, const TGLCamera & camera, const TGLBoundingBox & sceneBox)
{
// Handle mouse motion over manipulator - if active (selected widget) scale
// physical along selected widget (axis) of the manipulator, so it tracks mouse
// action. Returns kTRUE if redraw required kFALSE otherwise.
if (fActive) {
// Find mouse delta projected into world at attached object center
TGLVector3 shift = camera.ViewportDeltaToWorld(fShape->BoundingBox().Center(),
event.fX - fFirstMouse.GetX(),
-event.fY + fFirstMouse.GetY()); // Y inverted
UInt_t axisIndex = fSelectedWidget - 1; // Ugg sort out axis / widget id mapping
TGLVector3 widgetAxis = fShape->BoundingBox().Axis(axisIndex, kTRUE);
// Scale by projected screen factor
TGLVector3 screenScale = camera.ViewportDeltaToWorld(fShape->BoundingBox().Center(), 500, 500);
Double_t factor = -5.0*Dot(shift, widgetAxis) / screenScale.Mag();
TGLVector3 newScale = fStartScale;
newScale[axisIndex] += factor;
LimitScale(newScale[axisIndex]);
fShape->Scale(newScale);
fLastMouse.SetX(event.fX);
fLastMouse.SetY(event.fY);
return kTRUE;
} else {
return TGLManip::HandleMotion(event, camera, sceneBox);
}
}
//______________________________________________________________________________
void TGLScaleManip::LimitScale(Double_t & factor) const
{
// Clamp scale to sizable values: 1000 - 1/1000
// Guards against div by zero problems.
if (factor < 1e-4) {
factor = 1e-4;
}
if (factor > 1e+4) {
factor = 1e+4;
}
}
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