// @(#)root/gl:$Name: $:$Id: TGLTransManip.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 "TGLTransManip.h"
#include "TGLPhysicalShape.h"
#include "TGLCamera.h"
#include "TGLIncludes.h"
//////////////////////////////////////////////////////////////////////////
// //
// TGLTransManip //
// //
// Translation manipulator - attaches to physical shape and draws local //
// axes widgets with arrow heads. User can mouse over (turns yellow) and//
// L click/drag to translate along this axis. //
// Widgets use standard 3D package axes colours: X red, Y green, Z blue.//
//////////////////////////////////////////////////////////////////////////
ClassImp(TGLTransManip)
//______________________________________________________________________________
TGLTransManip::TGLTransManip()
{
// Construct translation manipulator not bound to any physical shape.
}
//______________________________________________________________________________
TGLTransManip::TGLTransManip(TGLPhysicalShape * shape) :
TGLManip(shape)
{
// Construct translation manipulator, attached to supplied TGLViewer
// 'viewer', bound to TGLPhysicalShape 'shape'.
}
//______________________________________________________________________________
TGLTransManip::~TGLTransManip()
{
// Destory the translation manipulator
}
//______________________________________________________________________________
void TGLTransManip::Draw(const TGLCamera & camera) const
{
// Draw translation manipulator - tubes with arrow 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::kTranslateX) {
glPushName(1);
TGLUtil::DrawLine(box.Center(), axisScale[0], TGLUtil::kLineHeadArrow,
baseScale, fSelectedWidget == 1 ? fgYellow : fgRed);
glPopName();
} else {
TGLUtil::DrawLine(box.Center(), axisScale[0], TGLUtil::kLineHeadArrow,
baseScale, fgGrey);
}
if (manip & TGLPhysicalShape::kTranslateY) {
glPushName(2);
TGLUtil::DrawLine(box.Center(), axisScale[1], TGLUtil::kLineHeadArrow,
baseScale, fSelectedWidget == 2 ? fgYellow : fgGreen);
glPopName();
} else {
TGLUtil::DrawLine(box.Center(), axisScale[1], TGLUtil::kLineHeadArrow,
baseScale, fgGrey);
}
if (manip & TGLPhysicalShape::kTranslateZ) {
glPushName(3);
TGLUtil::DrawLine(box.Center(), axisScale[2], TGLUtil::kLineHeadArrow,
baseScale, fSelectedWidget == 3 ? fgYellow : fgBlue);
glPopName();
} else {
TGLUtil::DrawLine(box.Center(), axisScale[2], TGLUtil::kLineHeadArrow,
baseScale, fgGrey);
}
// Draw white center sphere
TGLUtil::DrawSphere(box.Center(), baseScale/2.0, fgWhite);
glEnable(GL_CULL_FACE);
glDisable(GL_BLEND);
}
//______________________________________________________________________________
Bool_t TGLTransManip::HandleMotion(const Event_t & event, const TGLCamera & camera, const TGLBoundingBox & sceneBox)
{
// Handle mouse motion over manipulator - if active (selected widget) translate
// 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 - fLastMouse.GetX(),
-event.fY + fLastMouse.GetY()); // Y inverted
// Now project this delta onto the current widget (axis) to give
// a constrained shift along this
UInt_t axisIndex = fSelectedWidget - 1; // Ugg sort out axis / widget id mapping
TGLVector3 widgetAxis = fShape->BoundingBox().Axis(axisIndex, kTRUE);
TGLVector3 constrainedShift = widgetAxis * Dot(shift, widgetAxis);
fShape->Translate(constrainedShift);
fLastMouse.SetX(event.fX);
fLastMouse.SetY(event.fY);
return kTRUE;
} else {
return TGLManip::HandleMotion(event, camera, sceneBox);
}
}
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