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vcglib/wrap/gui/trackball.cpp

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/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 General Public License (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
#include <GL/glew.h>
#include "trackball.h"
#include<set>
#include <wrap/gl/math.h>
#include <wrap/gl/space.h>
using namespace vcg;
Transform::Transform() {
track.SetIdentity();
radius=1.0f;
center=Point3f(0,0,0);
}
Trackball::Trackball(): current_button(0), current_mode(NULL), inactive_mode(NULL),
dragging(false), last_time(0), spinnable(true), spinning(false),
history_size(10), fixedTimestepMode(false) {
setDefaultMapping ();
}
Trackball::~Trackball()
{
ClearModes();
delete inactive_mode;
}
void Trackball::ClearModes()
{
// Note: people ofter maps different keys to the same modes.
// so we should avoid double deletion of these double referenced modes.
std::set<TrackMode *> goodModes;
std::map<int, TrackMode *>::iterator it;
for(it = modes.begin(); it != modes.end(); it++)
if ((*it).second) goodModes.insert( (*it).second);
std::set<TrackMode *>::iterator its;
for(its = goodModes.begin(); its != goodModes.end(); its++)
delete *its;
modes.clear();
}
void Trackball::setDefaultMapping () {
idle_and_keys_mode = NULL;
inactive_mode = new InactiveMode ();
ClearModes();
modes[0] = NULL;
modes[BUTTON_MIDDLE | KEY_ALT] =
modes[BUTTON_LEFT] = new SphereMode ();
modes[BUTTON_LEFT | KEY_CTRL] = new PanMode ();
modes[BUTTON_MIDDLE] = new PanMode ();
modes[WHEEL] =
modes[BUTTON_LEFT | KEY_SHIFT] = new ScaleMode ();
modes[BUTTON_LEFT | KEY_ALT] = new ZMode ();
}
void Trackball::SetIdentity() {
track.SetIdentity();
Reset();
}
void Trackball::SetPosition(const Point3f &c, int /* millisec */) {
center = c;
}
void Trackball::GetView() {
camera.GetView();
}
// the drawing code has been moved to the trackmodes
void Trackball::DrawPostApply() {
if(current_mode !=NULL){
current_mode->Draw(this);
}else{
if (inactive_mode != NULL) inactive_mode->Draw(this);
}
}
void Trackball::Apply () {
glTranslate (center);
glMultMatrix (track.Matrix());
glTranslate (-center);
}
void Trackball::ApplyInverse() {
glTranslate(center);
glMultMatrix(track.InverseMatrix());
glTranslate(-center);
}
// T(c) S R T(t) T(-c) => S R T(S^(-1) R^(-1)(c) + t - c)
Matrix44f Trackball::Matrix() const{
#ifndef VCG_USE_EIGEN
Matrix44f r; track.rot.ToMatrix(r);
Matrix44f sr = Matrix44f().SetScale(track.sca, track.sca, track.sca) * r;
Matrix44f s_inv = Matrix44f().SetScale(1/track.sca, 1/track.sca, 1/track.sca);
Matrix44f t = Matrix44f().SetTranslate(s_inv*r.transpose()*center + track.tra - center);
return Matrix44f(sr*t);
#else
Eigen::Quaternionf rot(track.rot);
Eigen::Translation3f tr( (1/track.sca) * (rot.inverse() * center) + track.tra - center );
return ( Eigen::Scaling3f(track.sca) * (rot * tr) ).matrix();
#endif
}
Matrix44f Trackball::InverseMatrix() const{
return Inverse(Matrix());
}
void Trackball::Scale(const float s)
{
track.sca*=s;
}
void Trackball::Translate(Point3f tr)
{
Quaternionf irot = track.rot;
irot.Invert();
track.tra = last_track.tra + irot.Rotate(tr)/track.sca;
}
/***************************************************************/
// DrawCircle () e DrawPlane() have been moved to trackutils.h
// the drawing code has been moved to the trackmodes
/*
void Trackball::DrawCircle() {
int nside=DH.CircleStep;
const double pi2=3.14159265*2.0;
glBegin(GL_LINE_LOOP);
for(double i=0;i<nside;i++){
glNormal3d(cos(i*pi2/nside), sin(i*pi2/nside), 0.0);
glVertex3d(cos(i*pi2/nside), sin(i*pi2/nside), 0.0);
}
glEnd();
DrawPlaneHandle();
}
void Trackball::DrawPlane() {
const int nl=10;
float w=5.0f/3.0f;
float u;
glBegin(GL_LINES);
glNormal3f(0.0,0.0,1.0);
for( u=-w; u<=w+0.01f; u+=2*w/nl){
glVertex3f(-w, +u, 0);
glVertex3f(+w, +u, 0);
glVertex3f(+u, -w, 0);
glVertex3f(+u, +w, 0);
}
glEnd();
}
*/
void Trackball::ToAscii(char* result){
float * f = (float*) &track;
sprintf(result, "trackball(%f,%f,%f,%f,%f,%f,%f,%f)",
f[0],f[1],f[2],f[3],f[4],f[5],f[6],f[7] );
}
bool Trackball::SetFromAscii(const char * st){
float * f = (float*) &track;
int res= sscanf(st, "trackball(%f,%f,%f,%f,%f,%f,%f,%f)",
f+0,f+1,f+2,f+3,f+4,f+5,f+6,f+7 );
return (res==8);
}
// DrawPlaneHandle() e DrawIcon() have been moved to trackutils.h
// the drawing code has been moved to the trackmodes
/*
void Trackball::DrawPlaneHandle() {
float r=1.0;
float dr=r/10.0f;
glBegin(GL_LINE_STRIP);
glVertex3f(+r+dr, +r, 0.0);
glVertex3f(+r , +r+dr,0.0);
glVertex3f(+r-dr, +r, 0.0);
glVertex3f(+r , +r-dr,0.0);
glVertex3f(+r+dr, +r, 0.0);
glEnd();
glBegin(GL_LINE_STRIP);
glVertex3f(-r+dr, -r, 0.0);
glVertex3f(-r , -r+dr,0.0);
glVertex3f(-r-dr, -r, 0.0);
glVertex3f(-r , -r-dr,0.0);
glVertex3f(-r+dr, -r, 0.0);
glEnd();
}
void Trackball::DrawIcon() {
glPushMatrix();
glScale(radius);
/// Here start the real drawing stuff
float amb[4] ={.3f,.3f,.3f,1.0f};
float col[4] ={.5f,.5f,.8f,1.0f};
//float col2[4]={.9f,.9f,1.0f,1.0f};
glPushAttrib(GL_ENABLE_BIT | GL_LINE_BIT | GL_CURRENT_BIT | GL_LIGHTING_BIT);
if(current_mode == NULL ) glLineWidth(DH.LineWidthStill);
else glLineWidth(DH.LineWidthMoving);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor(DH.color);
glMaterialfv(GL_FRONT_AND_BACK,GL_EMISSION,amb);
glMaterialfv(GL_FRONT_AND_BACK,GL_DIFFUSE,col);
glPushMatrix();
DrawCircle();
glPushMatrix();
glRotatef(90,1,0,0);
DrawCircle();
glRotatef(90,0,1,0);
DrawCircle();
glPopMatrix();
glPopMatrix();
//glColor4f(1.0,.8f,.8f,1.0f);
glPopAttrib();
glPopMatrix();
}
*/
void Trackball::Reset() {
track.SetIdentity();
undo_track = track;
std::map<int, TrackMode *>::iterator i;
for(i = modes.begin(); i != modes.end(); i++){
TrackMode * mode=(*i).second;
if(mode!=NULL)
mode->Reset();
}
if (inactive_mode != NULL) inactive_mode->Reset();
}
//interface
void Trackball::MouseDown(int button) {
undo_track = track;
current_button |= button;
SetCurrentAction();
Hits.clear();
}
void Trackball::MouseDown(int x, int y, int button) {
undo_track = track;
current_button |= button;
SetCurrentAction();
last_point = Point3f((float)x, (float)y, 0);
Hits.clear();
}
void Trackball::MouseMove(int x, int y) {
if(current_mode == NULL) return;
if(last_point[2] == -1) { //changed mode in the middle of moving
last_point = Point3f((float)x, (float)y, 0);
return;
}
undo_track = track;
current_mode->Apply(this, Point3f(float(x), float(y), 0));
}
bool Trackball::IsAnimating(unsigned int msec){
bool res;
if(idle_and_keys_mode == NULL) res=false; else res=idle_and_keys_mode->IsAnimating(this);
if (!fixedTimestepMode) {
if (msec==0) msec = clock()*1000/CLOCKS_PER_SEC;
if (!res) {
last_time = msec;
}
}
return res;
}
void Trackball::Sync(unsigned int msec) {
if (!fixedTimestepMode) Animate(msec);
}
void Trackball::Animate(unsigned int msec){
unsigned int delta;
if (fixedTimestepMode) delta=msec;
else {
if (msec==0) msec = clock()*1000/CLOCKS_PER_SEC;
delta = msec -last_time;
last_time = msec;
}
if(idle_and_keys_mode == NULL) return;
idle_and_keys_mode->Animate(delta,this);
}
void Trackball::MouseUp(int /* x */, int /* y */, int button) {
undo_track = track;
ButtonUp(vcg::Trackball::Button(button));
//current_button &= (~button);
//SetCurrentAction();
}
// it assumes that a notch of 1.0 is a single step of the wheel
void Trackball::MouseWheel(float notch)
{
undo_track = track;
int buttons = current_button;
current_button = WHEEL | (buttons&(KEY_SHIFT|KEY_CTRL|KEY_ALT));
SetCurrentAction();
if (current_mode == NULL)
{
//ScaleMode scalemode;
//scalemode.Apply (this, notch);
}
else
{
current_mode->Apply(this, notch);
}
current_button = buttons;
SetCurrentAction();
}
void Trackball::MouseWheel(float notch, int button)
{
undo_track = track;
current_button |= button;
SetCurrentAction();
if (current_mode == NULL) {
ScaleMode scalemode;
scalemode.Apply (this, notch);
} else {
current_mode->Apply (this, notch);
}
current_button &= (~button);
SetCurrentAction ();
}
void Trackball::ButtonDown(Trackball::Button button, unsigned int msec) {
Sync(msec);
bool old_sticky=false, new_sticky=false;
assert (modes.count (0));
Button b=Button(current_button & MODIFIER_MASK);
if ( ( modes.count (b) ) && ( modes[b] != NULL ) ) old_sticky = modes[b]->isSticky();
current_button |= button;
b=Button(current_button & MODIFIER_MASK);
if ( ( modes.count (b) ) && ( modes[b] != NULL ) ) new_sticky = modes[b]->isSticky();
if ( !old_sticky && !new_sticky) SetCurrentAction();
}
void Trackball::ButtonUp(Trackball::Button button) {
bool old_sticky=false, new_sticky=false;
assert (modes.count (0));
Button b=Button(current_button & MODIFIER_MASK);
if ( ( modes.count (b) ) && ( modes[b] != NULL ) ) old_sticky = modes[b]->isSticky();
current_button &= (~button);
b=Button(current_button & MODIFIER_MASK);
if ( ( modes.count (b) ) && ( modes[b] != NULL ) ) new_sticky = modes[b]->isSticky();
if ( !old_sticky && !new_sticky) SetCurrentAction();
}
void Trackball::Undo(){
track = undo_track;
if(current_mode != NULL)
current_mode->Undo();
}
//spinning interface
void Trackball::SetSpinnable(bool /* on*/ ){}
bool Trackball::IsSpinnable() {
return spinnable;
}
void Trackball::SetSpinning(Quaternionf &/* spin*/){}
void Trackball::StopSpinning(){}
bool Trackball::IsSpinning() {
return spinning;
}
//navigation interface:
void Trackball::Back(){}
void Trackball::Forward(){}
void Trackball::Home(){}
void Trackball::HistorySize(int /* length */){}
void Trackball::SetCurrentAction ()
{
//I use strict matching.
assert (modes.count (0));
if (!modes.count (current_button & MODIFIER_MASK)) {
current_mode = NULL;
} else {
current_mode = modes[current_button & MODIFIER_MASK];
if(current_mode != NULL)
current_mode->SetAction();
}
last_point = Point3f (0, 0, -1);
last_track = track;
}
////return center of trackball in Window coordinates.
//Point3f Trackball::ScreenOrigin() {
// return camera.Project(ModelOrigin());
//}
//return center of trackball in Model coordinates
//Point3f Trackball::ModelOrigin() {
// return center;
//}
//Matrix44f Trackball::ScreenToModel() {
// return camera.inverse;
//}
//
//Similarityf Trackball::ModelToLocal() {
// Similarityf m = local * last_track;
// return m;
//}
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