glutrender.c

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/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#include "glutrender.h"
#include "viewport.h"
#include "arcball.h"
#include "appmouse.h"
#include "glexpose.h"
#include "glcompui.h"
#include <util/exit.h>
 
    /*call backs */
 
static float begin_x = 0.0;
static float begin_y = 0.0;
static float dx = 0.0;
static float dy = 0.0;
 
/*mouse mode mapping funvtion from glut to glcomp*/
static glMouseButtonType getGlCompMouseType(int n)
{
    switch (n) {
    case GLUT_LEFT_BUTTON:
        return glMouseLeftButton;
    case GLUT_RIGHT_BUTTON:
        return glMouseMiddleButton;
    case GLUT_MIDDLE_BUTTON:
        return glMouseRightButton;
 
    default:
        return glMouseLeftButton;
    }
}
 
 
static void cb_reshape(int width, int height)
{
    int vPort[4];
    float aspect;
    view->w = width;
    view->h = height;
    if (view->widgets)
        glcompsetUpdateBorder(view->widgets, view->w, view->h);
    glViewport(0, 0, view->w, view->h);
    /* get current viewport */
    glGetIntegerv(GL_VIEWPORT, vPort);
    /* setup various opengl things that we need */
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    init_arcBall(view->arcball, view->w, view->h);
    if (view->w > view->h) {
        aspect = (float) view->w / (float) view->h;
        glOrtho(-aspect * GL_VIEWPORT_FACTOR, aspect * GL_VIEWPORT_FACTOR,
                GL_VIEWPORT_FACTOR * -1, GL_VIEWPORT_FACTOR, -1500, 1500);
    } else {
        aspect = (float) view->h / (float) view->w;
        glOrtho(GL_VIEWPORT_FACTOR * -1, GL_VIEWPORT_FACTOR,
                -aspect * GL_VIEWPORT_FACTOR, aspect * GL_VIEWPORT_FACTOR,
                -1500, 1500);
    }
 
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
        /*** OpenGL END ***/
 
}
 
static void cb_display(void)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glLoadIdentity();
    glexpose_main(view);        //draw all stuff
    glutSwapBuffers();
    if (view->initFile) {
        view->initFile = 0;
        if (view->activeGraph == 0)
            close_graph(view);
        add_graph_to_viewport_from_file(view->initFileName);
    }
 
}
 
static void cb_mouseclick(int button, int state, int x, int y)
{
    if (view->g == 0) return;
    begin_x = (float) x;
    begin_y = (float) y;
    if(state==GLUT_DOWN)
    {
        view->widgets->base.common.functions.mousedown(&view->widgets->base,
                                                       (float)x, (float)y,
                                                       getGlCompMouseType(button));
        if (button ==  GLUT_LEFT_BUTTON)
            appmouse_left_click_down(view,x,y);
        if (button ==  GLUT_RIGHT_BUTTON)
            appmouse_right_click_down(view,x,y);
        if (button ==  GLUT_MIDDLE_BUTTON)
            appmouse_middle_click_down(view,x,y);
    }
    else
    {
        view->arcball->isDragging = 0;
        view->widgets->base.common.functions.mouseup(&view->widgets->base,
                                                     (float)x, (float)y,
                                                     getGlCompMouseType(button));
 
        if (button == GLUT_LEFT_BUTTON || button == GLUT_RIGHT_BUTTON ||
            button == GLUT_MIDDLE_BUTTON)
            appmouse_up(view, x, y);
        dx = 0.0;
        dy = 0.0;
    }
    cb_display();
 
}
 
// mouse moving with a button clicked (dragging)
static void cb_drag(int X, int Y)
{
 
    float x = (float) X;
    float y = (float) Y;
 
    if (view->widgets)
        view->widgets->base.common.functions.mouseover(&view->widgets->base, x, y);
 
    dx = x - begin_x;
    dy = y - begin_y;
    view->mouse.dragX = dx;
    view->mouse.dragY = dy;
    appmouse_move(view,x,y);
 
    if (view->mouse.down)
        appmouse_drag(view, x, y);
    begin_x = x;
    begin_y = y;
    cb_display();
 
}
 
static void cb_keyboard(unsigned char key, int x, int y)
{
    (void)x;
    (void)y;
 
    if (key==27)    /*ESC*/
        graphviz_exit(1);
    if(key=='3')
        switch2D3D(NULL, 0, 0,glMouseLeftButton);
    if(key=='c')
        menu_click_center(NULL, 0, 0,glMouseLeftButton);
 
    if(key=='+')
        menu_click_zoom_plus(NULL, 0, 0,glMouseLeftButton);
    if(key=='-')
        menu_click_zoom_minus(NULL, 0, 0,glMouseLeftButton);
    if(key=='p')
        menu_click_pan(NULL, 0, 0,glMouseLeftButton);
    
 
    appmouse_key_press(view,key);
}
 
static void cb_keyboard_up(unsigned char key, int x, int y)
{
    (void)key;
    (void)x;
    (void)y;
 
    appmouse_key_release(view);
}
 
static void cb_special_key(int key, int x, int y)
{
    (void)x;
    (void)y;
 
    if(key==GLUT_KEY_F1)
    {
        printf("Currently help is not available\n");
    }
    appmouse_key_press(view,key);
 
}
 
static void cb_special_key_up(int key, int x, int y)
{
    (void)x;
    (void)y;
 
    if(key==GLUT_KEY_F1)
    {
        printf("Currently help is not available\n");
    }
    appmouse_key_release(view);
 
}
 
static void cb_game_mode(char* optArg)
{
    
    glutGameModeString(optArg);
    if (glutGameModeGet(GLUT_GAME_MODE_POSSIBLE)) 
    {
        glutEnterGameMode();
    }
    else 
    {
        printf("smyrna cannot initialize requested screen resolution and rate!\n");
        graphviz_exit(-1);
 
    }
}
 
int cb_glutinit(int w, int h, int *argcp, char *argv[], char *optArg) {
    /*
    w,h: width and height of the window in pixels
    argcp argv: main function's parameters, required for glutinit
    */
 
 
 
    glutInit(argcp,argv); //this is required by some OS.
 
        glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
        // The Type Of Depth Testing To Do
        glDisable(GL_DEPTH);
        glClearDepth(1.0f);             // Depth Buffer Setup
        glEnable(GL_DEPTH_TEST);                                                        // Enables Depth Testing
        glDepthFunc(GL_LEQUAL);                                                         // The Type Of Depth Testing To 
        glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);      // Really Nice Perspective Calculations
 
 
    cb_game_mode(optArg);
 
    /*register callbacks here*/
    glutDisplayFunc(cb_display);
    glutReshapeFunc(cb_reshape);
    glutKeyboardFunc(cb_keyboard);
    glutKeyboardUpFunc( cb_keyboard_up);
    glutMouseFunc(cb_mouseclick);
    glutMotionFunc(cb_drag);
    glutPassiveMotionFunc(NULL);
    glutVisibilityFunc(NULL);
    glutEntryFunc(NULL);
    glutSpecialFunc(cb_special_key);
    glutSpecialUpFunc(cb_special_key_up);
 
    //Attach extra call backs if needed in the future
/*  glutOverlayDisplayFunc
    glutSpaceballMotionFunc
    glutSpaceballRotateFunc
    glutSpaceballButtonFunc
    glutButtonBoxFunc
    glutDialsFunc
    glutTabletMotionFunc
    glutTabletButtonFunc
    glutMenuStatusFunc
    glutIdleFunc
    glutTimerFunc 
*/
 
 
    //pass control to glut
    cb_reshape(w,h);
    glutMainLoop ();
 
 
    return 0; //we should never reach here
 
}