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gluvi.cpp
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gluvi.cpp
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#include <cmath>
#include <cstdarg>
#include <cstdlib>
#include <fstream>
#include "gluvi.h"
#include "vec.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846f
#endif
using namespace std;
namespace Gluvi{
Target3D::
Target3D(float target_[3], float dist_, float heading_, float pitch_, float fovy_, float near_clip_factor_, float far_clip_factor_)
: dist(dist_), heading(heading_), pitch(pitch_), fovy(fovy_),
near_clip_factor(near_clip_factor_), far_clip_factor(far_clip_factor_), action_mode(INACTIVE)
{
if(target_){
target[0]=target_[0];
target[1]=target_[1];
target[2]=target_[2];
}else{
target[0]=0;
target[1]=0;
target[2]=0;
}
default_target[0]=target[0];
default_target[1]=target[1];
default_target[2]=target[2];
default_dist=dist;
default_heading=heading;
default_pitch=pitch;
}
void Target3D::
click(int button, int state, int x, int y)
{
if(state==GLUT_UP)
action_mode=INACTIVE;
else if(button==GLUT_LEFT_BUTTON)
action_mode=ROTATE;
else if(button==GLUT_MIDDLE_BUTTON)
action_mode=TRUCK;
else if(button==GLUT_RIGHT_BUTTON)
action_mode=DOLLY;
oldmousex=x;
oldmousey=y;
}
void Target3D::
drag(int x, int y)
{
switch(action_mode){
case INACTIVE:
return; // nothing to do
case ROTATE:
heading+=0.007*(oldmousex-x);
if(heading<-M_PI) heading+=2*M_PI;
else if(heading>M_PI) heading-=2*M_PI;
pitch+=0.007*(oldmousey-y);
if(pitch<-0.5*M_PI) pitch=-0.5*M_PI;
else if(pitch>0.5*M_PI) pitch=0.5*M_PI;
break;
case TRUCK:
target[0]+=(0.002*dist)*cos(heading)*(oldmousex-x);
target[1]-=(0.002*dist)*(oldmousey-y);
target[2]-=(0.002*dist)*sin(heading)*(oldmousex-x);
break;
case DOLLY:
dist*=pow(1.01, oldmousey-y + x-oldmousex);
break;
}
oldmousex=x;
oldmousey=y;
glutPostRedisplay();
}
void Target3D::
return_to_default(void)
{
target[0]=default_target[0];
target[1]=default_target[1];
target[2]=default_target[2];
dist=default_dist;
heading=default_heading;
pitch=default_pitch;
}
void Target3D::
transform_mouse(int x, int y, float ray_origin[3], float ray_direction[3])
{
float ch=cos(heading), sh=sin(heading);
float cp=cos(pitch), sp=sin(pitch);
ray_origin[0]=target[0]+dist*sh*cp;
ray_origin[1]=target[1]-dist*sp;
ray_origin[2]=target[2]+dist*ch*cp;
float scale=0.5*tan(fovy)/winheight;
float camx=(x-0.5*winwidth)*scale, camy=(0.5*winheight-y)*scale, camz=-1.0; // in camera coordinates, this is ray_direction (but not normalized)
// now need to rotate into world space from camera space
float px=camx, py=camy*cp-camz*sp, pz=camy*sp+camz*cp;
ray_direction[0]=px*ch+pz*sh;
ray_direction[1]=py;
ray_direction[2]=-px*sh+pz*ch;
//@@@ is this right to get us to the near clipping plane?
ray_origin[0]+=near_clip_factor*dist*ray_direction[0];
ray_origin[1]+=near_clip_factor*dist*ray_direction[1];
ray_origin[2]+=near_clip_factor*dist*ray_direction[2];
// normalize direction vector
float mag=sqrt(ray_direction[0]*ray_direction[0]
+ ray_direction[1]*ray_direction[1]
+ ray_direction[2]*ray_direction[2]);
ray_direction[0]/=mag;
ray_direction[1]/=mag;
ray_direction[2]/=mag;
}
void Target3D::
get_viewing_direction(float direction[3])
{
float ch=cos(heading), sh=sin(heading);
float cp=cos(pitch), sp=sin(pitch);
direction[0]=-sh*cp;
direction[1]=sp;
direction[2]=-ch*cp;
}
void Target3D::
gl_transform(void)
{
glViewport(0, 0, (GLsizei)winwidth, (GLsizei)winheight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(fovy, winwidth/(float)winheight, near_clip_factor*dist, far_clip_factor*dist);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
GLfloat pos[3];
pos[0]=target[0]-dist*sin(heading)*cos(pitch);
pos[1]=target[1]-dist*sin(pitch);
pos[2]=target[2]-dist*cos(heading)*cos(pitch);
glTranslatef(0, 0, -dist); // translate target dist away in the z direction
glRotatef(-180/M_PI*pitch, 1, 0, 0); // rotate pitch in the yz plane
glRotatef(-180/M_PI*heading, 0, 1, 0); // rotate heading in the xz plane
glTranslatef(-target[0], -target[1], -target[2]); // translate target to origin
}
void Target3D::
export_rib(ostream &output)
{
output<<"Clipping "<<near_clip_factor*dist<<" "<<far_clip_factor*dist<<endl; // could be more generous here!
output<<"Projection \"perspective\" \"fov\" "<<fovy<<endl;
output<<"ReverseOrientation"<<endl; // RenderMan has a different handedness from OpenGL's default
output<<"Scale 1 1 -1"<<endl; // so we need to correct for that here
output<<"Translate 0 0 "<<-dist<<endl;
output<<"Rotate "<<-180/M_PI*pitch<<" 1 0 0"<<endl;
output<<"Rotate "<<-180/M_PI*heading<<" 0 1 0"<<endl;
output<<"Translate "<<-target[0]<<" "<<-target[1]<<" "<<-target[2]<<endl;
}
//=================================================================================
TargetOrtho3D::
TargetOrtho3D(float target_[3], float dist_, float heading_, float pitch_, float height_factor_, float near_clip_factor_, float far_clip_factor_)
: dist(dist_), heading(heading_), pitch(pitch_), height_factor(height_factor_),
near_clip_factor(near_clip_factor_), far_clip_factor(far_clip_factor_), action_mode(INACTIVE)
{
if(target_){
target[0]=target_[0];
target[1]=target_[1];
target[2]=target_[2];
}else{
target[0]=0;
target[1]=0;
target[2]=0;
}
default_target[0]=target[0];
default_target[1]=target[1];
default_target[2]=target[2];
default_dist=dist;
default_heading=heading;
default_pitch=pitch;
}
void TargetOrtho3D::
click(int button, int state, int x, int y)
{
if(state==GLUT_UP)
action_mode=INACTIVE;
else if(button==GLUT_LEFT_BUTTON)
action_mode=ROTATE;
else if(button==GLUT_MIDDLE_BUTTON)
action_mode=TRUCK;
else if(button==GLUT_RIGHT_BUTTON)
action_mode=DOLLY;
oldmousex=x;
oldmousey=y;
}
void TargetOrtho3D::
drag(int x, int y)
{
switch(action_mode){
case INACTIVE:
return; // nothing to do
case ROTATE:
heading+=0.007*(oldmousex-x);
if(heading<-M_PI) heading+=2*M_PI;
else if(heading>M_PI) heading-=2*M_PI;
pitch+=0.007*(oldmousey-y);
if(pitch<-0.5*M_PI) pitch=-0.5*M_PI;
else if(pitch>0.5*M_PI) pitch=0.5*M_PI;
break;
case TRUCK:
target[0]+=(0.002*dist)*cos(heading)*(oldmousex-x);
target[1]-=(0.002*dist)*(oldmousey-y);
target[2]-=(0.002*dist)*sin(heading)*(oldmousex-x);
break;
case DOLLY:
dist*=pow(1.01, oldmousey-y + x-oldmousex);
break;
}
oldmousex=x;
oldmousey=y;
glutPostRedisplay();
}
void TargetOrtho3D::
return_to_default(void)
{
target[0]=default_target[0];
target[1]=default_target[1];
target[2]=default_target[2];
dist=default_dist;
heading=default_heading;
pitch=default_pitch;
}
void TargetOrtho3D::
transform_mouse(int x, int y, float ray_origin[3], float ray_direction[3])
{
// @@@ unimplemented
}
void TargetOrtho3D::
get_viewing_direction(float direction[3])
{
float ch=cos(heading), sh=sin(heading);
float cp=cos(pitch), sp=sin(pitch);
direction[0]=-sh*cp;
direction[1]=sp;
direction[2]=-ch*cp;
}
void TargetOrtho3D::
gl_transform(void)
{
glViewport(0, 0, (GLsizei)winwidth, (GLsizei)winheight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
float halfheight=0.5*height_factor*dist, halfwidth=halfheight*winwidth/(float)winheight;
glOrtho(-halfwidth, halfwidth, -halfheight, halfheight, near_clip_factor*dist, far_clip_factor*dist);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
GLfloat pos[3];
pos[0]=target[0]-dist*sin(heading)*cos(pitch);
pos[1]=target[1]-dist*sin(pitch);
pos[2]=target[2]-dist*cos(heading)*cos(pitch);
glTranslatef(0, 0, -dist); // translate target dist away in the z direction
glRotatef(-180/M_PI*pitch, 1, 0, 0); // rotate pitch in the yz plane
glRotatef(-180/M_PI*heading, 0, 1, 0); // rotate heading in the xz plane
glTranslatef(-target[0], -target[1], -target[2]); // translate target to origin
}
void TargetOrtho3D::
export_rib(ostream &output)
{
output<<"Clipping "<<near_clip_factor*dist<<" "<<far_clip_factor*dist<<endl; // could be more generous here!
output<<"Projection \"orthographic\""<<endl;
//@@@ incomplete: need a scaling according to height_factor*dist somewhere in here
output<<"ReverseOrientation"<<endl; // RenderMan has a different handedness from OpenGL's default
output<<"Scale 1 1 -1"<<endl; // so we need to correct for that here
output<<"Translate 0 0 "<<-dist<<endl;
output<<"Rotate "<<-180/M_PI*pitch<<" 1 0 0"<<endl;
output<<"Rotate "<<-180/M_PI*heading<<" 0 1 0"<<endl;
output<<"Translate "<<-target[0]<<" "<<-target[1]<<" "<<-target[2]<<endl;
}
//=================================================================================
PanZoom2D::
PanZoom2D(float bottom_, float left_, float height_)
: bottom(bottom_), left(left_), height(height_), action_mode(INACTIVE)
{
default_bottom=bottom;
default_left=left;
default_height=height;
}
void PanZoom2D::
click(int button, int state, int x, int y)
{
if(state==GLUT_UP){
float r=height/winheight;
switch(action_mode){
case PAN:
if(!moved_since_mouse_down){
// make mouse click the centre of the window
left+=r*(x-0.5*winwidth);
bottom+=r*(0.5*winheight-y);
glutPostRedisplay();
}
break;
case ZOOM_IN:
if(moved_since_mouse_down){
// zoom in to selection
float desired_width=fabs((x-clickx)*height/winheight);
float desired_height=fabs((y-clicky)*height/winheight);
if(desired_height==0) desired_height=height/winheight;
if(desired_width*winheight > desired_height*winwidth)
desired_height=winheight*desired_width/winwidth;
else
desired_width=winwidth*desired_height/winheight;
left+=0.5*(x+clickx)*height/winheight-0.5*desired_width;
bottom+=(winheight-0.5*(y+clicky))*height/winheight-0.5*desired_height;
height=desired_height;
}else{
// zoom in by some constant factor on the mouse click
float factor=0.70710678118654752440084;
left+=(1-factor)*height*(x/(float)winheight);
bottom+=(1-factor)*height*(1-y/(float)winheight);
height*=factor;
}
glutPostRedisplay();
break;
case ZOOM_OUT:
// zoom out by some constant factor
{
float factor=1.41421356237309504880168;
left-=0.5*(factor-1)*winwidth*height/winheight;
bottom-=0.5*(factor-1)*height;
height*=factor;
}
glutPostRedisplay();
break;
default:
;// nothing to do
}
action_mode=INACTIVE;
}else if(button==GLUT_LEFT_BUTTON)
action_mode=PAN;
else if(button==GLUT_MIDDLE_BUTTON){
clickx=x;
clicky=y;
action_mode=ZOOM_IN;
}else if(button==GLUT_RIGHT_BUTTON)
action_mode=ZOOM_OUT;
moved_since_mouse_down=false;
oldmousex=x;
oldmousey=y;
}
void PanZoom2D::
drag(int x, int y)
{
if(x!=oldmousex || y!=oldmousey){
moved_since_mouse_down=true;
if(action_mode==PAN){
float r=height/winheight;
left-=r*(x-oldmousex);
bottom+=r*(y-oldmousey);
glutPostRedisplay();
}else if(action_mode==ZOOM_IN)
glutPostRedisplay();
oldmousex=x;
oldmousey=y;
}
}
void PanZoom2D::
return_to_default(void)
{
bottom=default_bottom;
left=default_left;
height=default_height;
}
void PanZoom2D::
transform_mouse(int x, int y, float coords[2])
{
float r=height/winheight;
coords[0]=x*r+left;
coords[1]=(winheight-y)*r+bottom;
}
void PanZoom2D::
gl_transform(void)
{
glViewport(0, 0, (GLsizei)winwidth, (GLsizei)winheight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(left, left+(height*winwidth)/winheight, bottom, bottom+height, 0, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void PanZoom2D::
export_rib(ostream &output)
{
// no projection matrix
output<<"Clipping 1 2000"<<endl; // somewhat arbitrary - hopefully this is plenty of space
output<<"ReverseOrientation"<<endl; // RenderMan has a different handedness from OpenGL's default
output<<"Scale 1 1 -1"<<endl; // so we need to correct for that here
// scale so that smaller dimension gets scaled to size 2
float scalefactor;
if(winwidth>winheight) scalefactor=2.0/height;
else scalefactor=2.0/(winwidth*height/winheight);
output<<"Scale "<<scalefactor<<" "<<scalefactor<<" 1"<<endl;
// translate so centre of view gets mapped to (0,0,1000)
output<<"Translate "<<-(left+0.5*winwidth*height/winheight)<<" "<<-(bottom+0.5*height)<< " 1000"<<endl;
}
void PanZoom2D::
display_screen(void)
{
if(action_mode==ZOOM_IN && moved_since_mouse_down){
glColor3f(1,1,1);
glBegin(GL_LINE_STRIP);
glVertex2i(clickx, winheight-clicky);
glVertex2i(oldmousex, winheight-clicky);
glVertex2i(oldmousex, winheight-oldmousey);
glVertex2i(clickx, winheight-oldmousey);
glVertex2i(clickx, winheight-clicky);
glEnd();
}
}
//=================================================================================
StaticText::
StaticText(const char *text_)
: text(text_)
{}
void StaticText::
display(int x, int y)
{
dispx=x;
dispy=y;
width=glutBitmapLength(GLUT_BITMAP_HELVETICA_12, (const unsigned char*)text)+1;
height=15;
glColor3f(0.3, 0.3, 0.3);
glRasterPos2i(x, y-height+2);
for(int i=0; text[i]!=0; ++i)
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, text[i]);
glColor3f(1, 1, 1);
glRasterPos2i(x+1, y-height+3);
for(int i=0; text[i]!=0; ++i)
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, text[i]);
}
//=================================================================================
Button::
Button(const char *text_, int minwidth_)
: status(UNINVOLVED), text(text_), minwidth(minwidth_)
{}
void Button::
display(int x, int y)
{
dispx=x;
dispy=y;
int textwidth=glutBitmapLength(GLUT_BITMAP_HELVETICA_12, (const unsigned char*)text);
if(textwidth<minwidth) width=minwidth+24;
else width=textwidth+24;
height=17;
if(status==UNINVOLVED){
glColor3f(0.7, 0.7, 0.7);
glBegin(GL_QUADS);
glVertex2i(x+1, y-1);
glVertex2i(x+width, y-1);
glVertex2i(x+width, y-height+1);
glVertex2i(x+1, y-height+1);
glEnd();
glColor3f(0.3, 0.3, 0.3);
glLineWidth(1);
glBegin(GL_LINE_STRIP);
glVertex2i(x, y-2);
glVertex2i(x, y-height);
glVertex2i(x+width-1, y-height);
glEnd();
glColor3f(0.3, 0.3, 0.3);
}else{
if(status==SELECTED) glColor3f(0.8, 0.8, 0.8);
else glColor3f(1, 1, 1);
glBegin(GL_QUADS);
glVertex2i(x, y-1);
glVertex2i(x+width, y-1);
glVertex2i(x+width, y-height);
glVertex2i(x, y-height);
glEnd();
glColor3f(0, 0, 0);
}
glRasterPos2i(x+(width-textwidth)/2, y-height+5);
for(int i=0; text[i]!=0; ++i)
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, text[i]);
}
bool Button::
click(int state, int x, int y)
{
if(state==GLUT_DOWN && x>dispx && x<=dispx+width && y<dispy-2 && y>=dispy-height){
status=HIGHLIGHTED;
glutPostRedisplay();
return true;
}else if(state==GLUT_UP && status!=UNINVOLVED){
status=UNINVOLVED;
glutPostRedisplay();
if(x>=dispx && x<dispx+width && y<dispy-2 && y>=dispy-height)
action();
return true;
}else
return false;
}
void Button::
drag(int x, int y)
{
// needs to control highlighting (SELECTED vs. HIGHLIGHTED)
if(status==SELECTED && x>=dispx && x<dispx+width && y<dispy-2 && y>=dispy-height){
status=HIGHLIGHTED;
glutPostRedisplay();
}else if(status==HIGHLIGHTED && !(x>=dispx && x<dispx+width && y<dispy-2 && y>=dispy-height)){
status=SELECTED;
glutPostRedisplay();
}
}
//=================================================================================
Slider::
Slider(const char *text_, int length_, int position_, int justify_)
: status(UNINVOLVED), text(text_), length(length_), justify(justify_), position(position_)
{}
void Slider::
display(int x, int y)
{
dispx=x;
dispy=y;
width=glutBitmapLength(GLUT_BITMAP_HELVETICA_12, (const unsigned char*)text);
if(width<justify) width=justify;
width+=11+6+length+1;
height=15;
glColor3f(0.3, 0.3, 0.3);
glRasterPos2i(x, y-height+2);
for(int i=0; text[i]!=0; ++i)
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, text[i]);
glColor3f(1, 1, 1);
glRasterPos2i(x+1, y-height+3);
for(int i=0; text[i]!=0; ++i)
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, text[i]);
scrollxmin=x+width-length-12;
scrollxmax=x+width;
scrollymin=y-height+1;
scrollymax=y-2;
glColor3f(0.3, 0.3, 0.3);
glLineWidth(1);
glBegin(GL_LINE_STRIP);
glVertex2i(scrollxmin, scrollymax-1);
glVertex2i(scrollxmin, scrollymin);
glVertex2i(scrollxmax-1, scrollymin);
glVertex2i(scrollxmax-1, scrollymax-1);
glEnd();
glColor3f(0.7, 0.7, 0.7);
glBegin(GL_LINE_STRIP);
glVertex2i(scrollxmin+1, scrollymax);
glVertex2i(scrollxmin+1, scrollymin+1);
glVertex2i(scrollxmax, scrollymin+1);
glVertex2i(scrollxmax, scrollymax);
glEnd();
if(status==UNINVOLVED){
glColor3f(0.3, 0.3, 0.3);
glBegin(GL_LINE_STRIP);
glVertex2i(scrollxmin+position+2, scrollymax-2);
glVertex2i(scrollxmin+position+2, scrollymin+2);
glVertex2i(scrollxmin+position+10, scrollymin+2);
glEnd();
glColor3f(0.7, 0.7, 0.7);
glBegin(GL_QUADS);
glVertex2i(scrollxmin+position+3, scrollymin+3);
glVertex2i(scrollxmin+position+11, scrollymin+3);
glVertex2i(scrollxmin+position+11, scrollymax);
glVertex2i(scrollxmin+position+3, scrollymax);
glEnd();
}else{ // SELECTED
glColor3f(1, 1, 1);
glBegin(GL_QUADS);
glVertex2i(scrollxmin+position+2, scrollymin+2);
glVertex2i(scrollxmin+position+11, scrollymin+2);
glVertex2i(scrollxmin+position+11, scrollymax);
glVertex2i(scrollxmin+position+2, scrollymax);
glEnd();
}
}
bool Slider::
click(int state, int x, int y)
{
if(state==GLUT_DOWN && x>scrollxmin+position+2 && x<=scrollxmin+position+11 && y<scrollymax-1 && y>=scrollymin+2){
status=SELECTED;
clickx=x;
glutPostRedisplay();
return true;
}else if(status!=UNINVOLVED && state==GLUT_UP){
status=UNINVOLVED;
glutPostRedisplay();
return true;
}else
return false;
}
void Slider::
drag(int x, int y)
{
if(status==SELECTED){
glutPostRedisplay();
int newposition=position+(x-clickx);
clickx=x;
if(newposition<0){
clickx+=(0-newposition);
newposition=0;
}else if(newposition>length){
clickx+=(length-newposition);
newposition=length;
}
if(newposition!=position){
position=newposition;
action();
glutPostRedisplay();
}
}
}
//=================================================================================
WidgetList::
WidgetList(int indent_, bool hidden_)
: indent(indent_), hidden(hidden_), downclicked_member(-1)
{
}
void WidgetList::
display(int x, int y)
{
dispx=x;
dispy=y;
if(hidden){
width=height=0;
}else{
height=0;
for(unsigned int i=0; i<list.size(); ++i){
list[i]->display(x+indent, y-height);
height+=list[i]->height;
width=(width<indent+list[i]->width) ? indent+list[i]->width : width;
}
}
}
bool WidgetList::
click(int state, int x, int y)
{
//if(hidden || x<dispx || x>=dispx+width || y>=dispy || y<dispy-height) return false; // early exit
if(state==GLUT_DOWN){ // search for correct widget
for(unsigned int i=0; i<list.size(); ++i){
if(list[i]->click(state, x, y)){
downclicked_member=i;
return true;
}
}
}else if(state==GLUT_UP && downclicked_member>=0){
list[downclicked_member]->click(state, x, y);
downclicked_member=-1;
}
return false;
}
void WidgetList::
drag(int x, int y)
{
if(downclicked_member>=0)
list[downclicked_member]->drag(x, y);
}
//=================================================================================
static void gluviReshape(int w, int h)
{
winwidth=w;
winheight=h;
glutPostRedisplay(); // triggers the camera to adjust itself to the new dimensions
}
//=================================================================================
static void gluviDisplay()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
// draw the scene
if(camera) camera->gl_transform();
if(userDisplayFunc) userDisplayFunc();
// now draw widgets on top
glPushAttrib(GL_CURRENT_BIT|GL_ENABLE_BIT|GL_LINE_BIT);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glLineWidth(1);
// and probably more needs setting before widgets
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, winwidth, 0, winheight);
root.display(0, winheight);
// and allow the camera to draw something on screen (e.g. for zooming extent)
if(camera) camera->display_screen();
glPopAttrib();
glutSwapBuffers();
}
//=================================================================================
static enum {NOBODY, CAMERA, WIDGETS, USER} mouse_owner=NOBODY;
static void gluviMouse(int button, int state, int x, int y)
{
if(state==GLUT_DOWN){
int mods=glutGetModifiers();
if(camera && mods==GLUT_ACTIVE_SHIFT){
camera->click(button, state, x, y);
mouse_owner=CAMERA;
}else if(button==GLUT_LEFT_BUTTON && root.click(state, x, winheight-y)){
mouse_owner=WIDGETS;
}else if(userMouseFunc){
userMouseFunc(button, state, x, y);
mouse_owner=USER;
}
}else{ // mouse up - send event to whoever got the mouse down
switch(mouse_owner){
case CAMERA:
camera->click(button, state, x, y);
break;
case WIDGETS:
root.click(state, x, winheight-y);
break;
case USER:
if(userMouseFunc) userMouseFunc(button, state, x, y);
break;
default:
;// nothing to do
}
mouse_owner=NOBODY;
}
}
//=================================================================================
static void gluviDrag(int x, int y)
{
switch(mouse_owner){
case CAMERA:
camera->drag(x, y);
break;
case WIDGETS:
root.drag(x, winheight-y);
break;
case USER:
if(userDragFunc) userDragFunc(x, y);
break;
default:
;// nothing to do
}
}
//=================================================================================
void ppm_screenshot(const char *filename_format, ...)
{
va_list ap;
va_start(ap, filename_format);
#ifdef _MSC_VER
#define FILENAMELENGTH 256
char filename[FILENAMELENGTH];
_vsnprintf(filename, FILENAMELENGTH, filename_format, ap);
ofstream out(filename, ofstream::binary);
#else
char *filename;
vasprintf(&filename, filename_format, ap);
ofstream out(filename, ofstream::binary);
free(filename);
#endif
if(!out) return;
GLubyte *image_buffer=new GLubyte[3*winwidth*winheight];
glReadBuffer(GL_FRONT);
glReadPixels(0, 0, winwidth, winheight, GL_RGB, GL_UNSIGNED_BYTE, image_buffer);
out<<"P6\n"<<winwidth<<' '<<winheight<<" 255\n";
for(int i=1; i<=winheight; ++i)
out.write((const char*)image_buffer+3*winwidth*(winheight-i), 3*winwidth);
delete[] image_buffer;
}
static void write_big_endian_ushort(std::ostream &output, unsigned short v)
{
output.put((v>>8)%256);
output.put(v%256);
}
static void write_big_endian_uint(std::ostream &output, unsigned int v)
{
output.put((v>>24)%256);
output.put((v>>16)%256);
output.put((v>>8)%256);
output.put(v%256);
}
void sgi_screenshot(const char *filename_format, ...)
{
va_list ap;
va_start(ap, filename_format);
#ifdef _MSC_VER
#define FILENAMELENGTH 256
char filename[FILENAMELENGTH];
_vsnprintf(filename, FILENAMELENGTH, filename_format, ap);
ofstream output(filename, ofstream::binary);
#else
char *filename;
vasprintf(&filename, filename_format, ap);
ofstream output(filename, ofstream::binary);
#endif
if(!output) return;
// first write the SGI header
write_big_endian_ushort(output, 474); // magic number to identify this as an SGI image file
output.put(0); // uncompressed
output.put(1); // use 8-bit colour depth
write_big_endian_ushort(output, 3); // number of dimensions
write_big_endian_ushort(output, winwidth); // x size
write_big_endian_ushort(output, winheight); // y size
write_big_endian_ushort(output, 3); // three colour channels (z size)
write_big_endian_uint(output, 0); // minimum pixel value
write_big_endian_uint(output, 255); // maximum pixel value
write_big_endian_uint(output, 0); // dummy spacing
// image name
int i;
for(i=0; i<80 && filename[i]; ++i)
output.put(filename[i]);
for(; i<80; ++i)
output.put(0);
write_big_endian_uint(output, 0); // colormap is normal
for(i=0; i<404; ++i) output.put(0); // filler to complete header
// now write the SGI image data
GLubyte *image_buffer=new GLubyte[winwidth*winheight];
glReadBuffer(GL_FRONT);
glReadPixels(0, 0, winwidth, winheight, GL_RED, GL_UNSIGNED_BYTE, image_buffer);
output.write((const char*)image_buffer, winwidth*winheight);
glReadPixels(0, 0, winwidth, winheight, GL_GREEN, GL_UNSIGNED_BYTE, image_buffer);
output.write((const char*)image_buffer, winwidth*winheight);
glReadPixels(0, 0, winwidth, winheight, GL_BLUE, GL_UNSIGNED_BYTE, image_buffer);
output.write((const char*)image_buffer, winwidth*winheight);
delete[] image_buffer;
#ifndef _MSC_VER
free(filename);
#endif
}
void set_generic_lights(void)
{
glEnable(GL_LIGHTING);
{
GLfloat ambient[4] = {.3, .3, .3, 1};
glLightModelfv (GL_LIGHT_MODEL_AMBIENT,ambient);
}
{
GLfloat color[4] = {.8, .8, .8, 1};
glLightfv (GL_LIGHT0, GL_DIFFUSE, color);
glLightfv (GL_LIGHT0, GL_SPECULAR, color);
glEnable (GL_LIGHT0);
}
{
GLfloat color[4] = {.4, .4, .4, 1};
glLightfv (GL_LIGHT1, GL_DIFFUSE, color);
glLightfv (GL_LIGHT1, GL_SPECULAR, color);
glEnable (GL_LIGHT1);
}
{
GLfloat color[4] = {.2, .2, .2, 1};
glLightfv (GL_LIGHT2, GL_DIFFUSE, color);
glLightfv (GL_LIGHT2, GL_SPECULAR, color);
glEnable (GL_LIGHT2);
}
}
void set_generic_material(float r, float g, float b, GLenum face)
{
GLfloat ambient[4], diffuse[4], specular[4];
ambient[0]=0.1*r+0.03; ambient[1]=0.1*g+0.03; ambient[2]=0.1*b+0.03; ambient[3]=1;
diffuse[0]=0.7*r; diffuse[1]=0.7*g; diffuse[2]=0.7*b; diffuse[3]=1;
specular[0]=0.1*r+0.1; specular[1]=0.1*g+0.1; specular[2]=0.1*b+0.1; specular[3]=1;
glMaterialfv(face, GL_AMBIENT, ambient);
glMaterialfv(face, GL_DIFFUSE, diffuse);
glMaterialfv(face, GL_SPECULAR, specular);
glMaterialf(face, GL_SHININESS, 32);
}
void set_matte_material(float r, float g, float b, GLenum face)
{
GLfloat ambient[4], diffuse[4], specular[4];
ambient[0]=0.1*r+0.03; ambient[1]=0.1*g+0.03; ambient[2]=0.1*b+0.03; ambient[3]=1;
diffuse[0]=0.9*r; diffuse[1]=0.9*g; diffuse[2]=0.9*b; diffuse[3]=1;
specular[0]=0; specular[1]=0; specular[2]=0; specular[3]=1;
glMaterialfv(face, GL_AMBIENT, ambient);
glMaterialfv(face, GL_DIFFUSE, diffuse);
glMaterialfv(face, GL_SPECULAR, specular);
}
/**
* Draw a vector in 3D. If arrow_head_length not specified, set it to 10% of vector length.
* Mar 29, 2006
*/
void draw_3d_arrow(const float base[3], const float point[3], float arrow_head_length)
{
//glPushAttrib(GL_CURRENT_BIT|GL_ENABLE_BIT|GL_LINE_BIT);
//glDisable(GL_LIGHTING);
glLineWidth(1);
glColor3f(0.5,0.5,0.5);
Vec3f w(point[0]-base[0], point[1]-base[1], point[2]-base[2]);
double len = mag(w);
w = w / (float)len; // normalize to build coordinate system
// create a coordinate system from the vector:
// get a vector perp to w and y-axis
Vec3f u = cross(w, Vec3f(0,1,0));
// If vector is parallel to the y-axis, use the x-axis
if (mag(u) == 0)
u = cross(w, Vec3f(1,0,0));
// get a vector perp to w and u
Vec3f v = cross(w, u/mag(u));
v = v/mag(v);
if (!arrow_head_length)
arrow_head_length = 0.1 * len;
// arrow head points
//@@@@@@@ POSSIBILITY: CREATE FOUR ARROW HEAD SEGMENTS INSTEAD OF TWO
Vec3f arrow1, arrow2;
arrow1[0] = point[0] + arrow_head_length * (v[0] - w[0]);
arrow1[1] = point[1] + arrow_head_length * (v[1] - w[1]);
arrow1[2] = point[2] + arrow_head_length * (v[2] - w[2]);
arrow2[0] = point[0] + arrow_head_length * (-v[0] - w[0]);
arrow2[1] = point[1] + arrow_head_length * (-v[1] - w[1]);
arrow2[2] = point[2] + arrow_head_length * (-v[2] - w[2]);
glBegin(GL_LINES);
glVertex3f(base[0], base[1], base[2]);
glVertex3f(point[0], point[1], point[2]);
glVertex3f(point[0], point[1], point[2]);
glVertex3f(arrow1[0], arrow1[1], arrow1[2]);
glVertex3f(point[0], point[1], point[2]);
glVertex3f(arrow2[0], arrow2[1], arrow2[2]);
glEnd();
//glPopAttrib();
}
// draw_2d_arrow assumptions:
// line width, point size, and color are set by the user prior to calling the routine
void draw_2d_arrow(const Vec2f base, const Vec2f point, float arrow_head_length)
{
//glPushAttrib(GL_CURRENT_BIT|GL_ENABLE_BIT|GL_LINE_BIT);
//glDisable(GL_LIGHTING);