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Reference Guide
TGLManip.cxx
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1 // @(#)root/gl:$Id$
2 // Author: Richard Maunder 16/09/2005
3 
4 /*************************************************************************
5  * Copyright (C) 1995-2005, Rene Brun and Fons Rademakers. *
6  * All rights reserved. *
7  * *
8  * For the licensing terms see $ROOTSYS/LICENSE. *
9  * For the list of contributors see $ROOTSYS/README/CREDITS. *
10  *************************************************************************/
11 
12 #include "TGLManip.h"
13 #include "TGLUtil.h"
14 #include "TGLCamera.h"
15 #include "TGLPhysicalShape.h"
16 #include "TGLIncludes.h"
17 #include "TROOT.h"
18 
19 #include "TVirtualX.h"
20 
21 /** \class TGLManip
22 \ingroup opengl
23 Abstract base class for viewer manipulators, which allow direct in
24 viewer manipulation of a (TGlPhysicalShape) object - currently
25 translation, scaling and rotation along/round objects local axes.
26 See derived classes for these implementations.
27 
28 This class provides binding to the zero or one manipulated physical,
29 hit testing (selection) for manipulator sub component (widget), and
30 some common mouse action handling/tracking.
31 */
32 
34 
35 ////////////////////////////////////////////////////////////////////////////////
36 /// Construct a manipulator object, bound to supplied viewer, and no
37 /// physical shape.
38 
40  fShape(0),
41  fSelectedWidget(0), fActive(kFALSE),
42  fFirstMouse(0, 0),
43  fLastMouse(0, 0)
44 {
45 }
46 
47 ////////////////////////////////////////////////////////////////////////////////
48 /// Construct a manipulator object, bound to supplied physical shape.
49 
51  fShape(shape),
53  fFirstMouse(0, 0),
54  fLastMouse(0, 0)
55 {
56 }
57 
58 ////////////////////////////////////////////////////////////////////////////////
59 /// Copy constructor.
60 
62  TVirtualGLManip(gm),
63  fShape(gm.fShape),
65  fActive(gm.fActive),
68 {
69 }
70 
71 ////////////////////////////////////////////////////////////////////////////////
72 /// Assignment operator.
73 
75 {
76  if(this!=&gm) {
78  fShape=gm.fShape;
80  fActive=gm.fActive;
83  }
84  return *this;
85 }
86 
87 ////////////////////////////////////////////////////////////////////////////////
88 /// Destroy manipulator object.
89 
91 {
92 }
93 
94 ////////////////////////////////////////////////////////////////////////////////
95 /// Returns color to be used for given widget.
96 
97 const UChar_t* TGLManip::ColorFor(UInt_t widget) const
98 {
99  if (widget == fSelectedWidget)
100  {
101  return TGLUtil::fgYellow;
102  }
103  else
104  {
105  switch (widget)
106  {
107  case 1: return TGLUtil::fgRed;
108  case 2: return TGLUtil::fgGreen;
109  case 3: return TGLUtil::fgBlue;
110  default: return TGLUtil::fgGrey;
111  }
112  }
113 }
114 
115 ////////////////////////////////////////////////////////////////////////////////
116 /// Handle a mouse button event - return kTRUE if processed, kFALSE otherwise
117 
118 Bool_t TGLManip::HandleButton(const Event_t& event, const TGLCamera& /*camera*/)
119 {
120  // Only interested in Left mouse button actions
121  if (event.fCode != kButton1) {
122  return kFALSE;
123  }
124 
125  // Mouse down on selected widget?
126  if (event.fType == kButtonPress && fSelectedWidget != 0) {
127  fFirstMouse.SetX(event.fX);
128  fFirstMouse.SetY(event.fY);
129  fLastMouse.SetX(event.fX);
130  fLastMouse.SetY(event.fY);
131  fActive = kTRUE;
132  return kTRUE;
133  } else if (event.fType == kButtonRelease && fActive) {
134  fActive = kFALSE;
135  return kTRUE;
136  } else {
137  return kFALSE;
138  }
139 }
140 
141 ////////////////////////////////////////////////////////////////////////////////
142 /// Handle a mouse button event - return kTRUE if widget selection change
143 /// kFALSE otherwise
144 
146  const TGLCamera& /*camera*/)
147 {
148  return kFALSE;
149 }
150 
151 ////////////////////////////////////////////////////////////////////////////////
152 /// Calculates base and axis scale factor (in world units) for
153 /// drawing manipulators with reasonable size range in current
154 /// camera.
155 
157  const TGLCamera& camera,
158  Double_t& base,
159  TGLVector3 axis[3]) const
160 {
161  // Calculate a base scale
162  base = box.Extents().Mag() / 100.0;
163 
164  // Clamp this base scale to a viewport pixel range
165  // Allow some variation so zooming is noticeable
166  TGLVector3 pixelInWorld = camera.ViewportDeltaToWorld(box.Center(), 1, 1);
167  Double_t pixelScale = pixelInWorld.Mag();
168  if (base < pixelScale * 3.0) {
169  base = pixelScale * 3.0;
170  } else if (base > pixelScale * 6.0) {
171  base = pixelScale * 6.0;
172  }
173 
174  // Calculate some axis scales
175  for (UInt_t i = 0; i<3; i++) {
176  if (box.IsEmpty()) {
177  axis[i] = box.Axis(i, kTRUE)*base*-10.0;
178  } else {
179  axis[i] = box.Axis(i, kFALSE)*-0.51;
180  if (axis[i].Mag() < base*10.0) {
181  axis[i] = box.Axis(i, kTRUE)*base*-10.0;
182  }
183  }
184  }
185 }
Abstract base class for viewer manipulators, which allow direct in viewer manipulation of a (TGlPhysi...
Definition: TGLManip.h:28
void SetX(SCoord_t x)
Definition: TPoint.h:49
TGLVertex3 Center() const
Abstract base camera class - concrete classes for orthographic and perspective cameras derive from it...
Definition: TGLCamera.h:43
TGLVector3 Extents() const
static const UChar_t fgYellow[4]
Definition: TGLUtil.h:1050
T Mag(const SVector< T, D > &rhs)
Vector magnitude (Euclidian norm) Compute : .
Definition: Functions.h:252
Int_t fY
Definition: GuiTypes.h:177
virtual Bool_t HandleButton(const Event_t &event, const TGLCamera &camera)
Handle a mouse button event - return kTRUE if processed, kFALSE otherwise.
Definition: TGLManip.cxx:118
static const UChar_t fgGrey[4]
Definition: TGLUtil.h:1052
bool Bool_t
Definition: RtypesCore.h:59
UInt_t fSelectedWidget
manipulated shape
Definition: TGLManip.h:32
void box(Int_t pat, Double_t x1, Double_t y1, Double_t x2, Double_t y2)
Definition: fillpatterns.C:1
void SetY(SCoord_t y)
Definition: TPoint.h:50
static const UChar_t fgRed[4]
Definition: TGLUtil.h:1047
Concrete physical shape - a GL drawable.
Bool_t IsEmpty() const
3 component (x/y/z) vector class.
Definition: TGLUtil.h:246
TPoint fLastMouse
first (start) mouse position (in WINDOW coords)
Definition: TGLManip.h:37
TGLManip()
Construct a manipulator object, bound to supplied viewer, and no physical shape.
Definition: TGLManip.cxx:39
const UChar_t * ColorFor(UInt_t widget) const
Returns color to be used for given widget.
Definition: TGLManip.cxx:97
TGLVector3 ViewportDeltaToWorld(const TGLVertex3 &worldRef, Double_t viewportXDelta, Double_t viewportYDelta, TGLMatrix *modviewMat=0) const
Apply a 2D viewport delta (shift) to the projection of worldRef onto viewport, returning the resultan...
Definition: TGLCamera.cxx:546
Bool_t fActive
active width (axis) component
Definition: TGLManip.h:33
static const UChar_t fgBlue[4]
Definition: TGLUtil.h:1049
Double_t Mag() const
Definition: TGLUtil.h:299
EGEventType fType
Definition: GuiTypes.h:174
TGLPhysicalShape * fShape
Definition: TGLManip.h:31
unsigned int UInt_t
Definition: RtypesCore.h:42
static const UChar_t fgGreen[4]
Definition: TGLUtil.h:1048
const Bool_t kFALSE
Definition: RtypesCore.h:88
#define ClassImp(name)
Definition: Rtypes.h:359
double Double_t
Definition: RtypesCore.h:55
UInt_t fCode
Definition: GuiTypes.h:179
TGLManip & operator=(const TGLManip &)
Assignment operator.
Definition: TGLManip.cxx:74
Binding & operator=(OUT(*fun)(void))
Concrete class describing an orientated (free) or axis aligned box of 8 vertices. ...
void CalcDrawScale(const TGLBoundingBox &box, const TGLCamera &camera, Double_t &base, TGLVector3 axis[3]) const
Calculates base and axis scale factor (in world units) for drawing manipulators with reasonable size ...
Definition: TGLManip.cxx:156
const TGLVector3 & Axis(UInt_t i, Bool_t normalised=kTRUE) const
virtual Bool_t HandleMotion(const Event_t &event, const TGLCamera &camera)
Handle a mouse button event - return kTRUE if widget selection change kFALSE otherwise.
Definition: TGLManip.cxx:145
unsigned char UChar_t
Definition: RtypesCore.h:34
TPoint fFirstMouse
manipulator is active?
Definition: TGLManip.h:36
const Bool_t kTRUE
Definition: RtypesCore.h:87
virtual ~TGLManip()
Destroy manipulator object.
Definition: TGLManip.cxx:90
Int_t fX
Definition: GuiTypes.h:177