glexpose.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 "glexpose.h"
#include "draw.h"
#include "topviewfuncs.h"
#include <glcomp/glutils.h>
#include "topfisheyeview.h"
#include "gui/toolboxcallbacks.h"
#include "arcball.h"
#include "hotkeymap.h"
#include "polytess.h"
#include <stdint.h>
 
static void drawRotatingAxis(void)
{
    static GLUquadricObj *quadratic;
    float AL = 45;
 
    if (get_mode(view) != MM_ROTATE)
            return;
 
    if (!quadratic) {
        quadratic = gluNewQuadric();    // Create A Pointer To The Quadric Object
        gluQuadricNormals(quadratic, GLU_SMOOTH);       // Create Smooth Normals
        gluQuadricDrawStyle(quadratic, GLU_LINE);
 
 
    }
 
        glPushMatrix();
        glLoadIdentity();
        glMultMatrixf(view->arcball->Transform.M);      /*arcball transformations , experimental */
        glLineWidth(3);
        glBegin(GL_LINES);
        glColor3f(1, 1, 0);
 
        glVertex3f(0, 0, 0);
        glVertex3f(0, AL, 0);
 
        glVertex3f(0, 0, 0);
        glVertex3f(AL, 0, 0);
 
        glVertex3f(0, 0, 0);
        glVertex3f(0, 0, AL);
 
        glEnd();
        glColor4f(0, 1, 0, 0.3f);
        gluSphere(quadratic, AL, 20, 20);
        glLineWidth(1);
        glPopMatrix();
 
 
}
 
 
 
/*
        refreshes camera settings using view parameters such as pan zoom etc
        if a camera is selected viewport is switched to 3D
        params:ViewInfo , global view variable defined in viewport.c
        return value:always 1
*/
static int glupdatecamera(ViewInfo * vi)
{
    if (vi->active_camera == SIZE_MAX)
        glTranslatef(-vi->panx, -vi->pany, vi->panz);
 
 
    /*toggle to active camera */
    else {
        glMultMatrixf(vi->arcball->Transform.M);        /*arcball transformations , experimental */
        glTranslatef(-vi->cameras[vi->active_camera]->targetx,
                     -vi->cameras[vi->active_camera]->targety, 0);
    }
    vi->clipX1=0;
    vi->clipX2=0;
    vi->clipY1=0;
    vi->clipY2=0;
    GetOGLPosRef(1, vi->h - 5, &(vi->clipX1), &(vi->clipY1));
    GetOGLPosRef(vi->w - 1, 1, &(vi->clipX2), &(vi->clipY2));
 
    if (vi->active_camera == SIZE_MAX) {
        glScalef(1 / vi->zoom * -1, 1 / vi->zoom * -1,
                 1 / vi->zoom * -1);
    } else {
        glScalef(1 / vi->cameras[vi->active_camera]->r,
                 1 / vi->cameras[vi->active_camera]->r,
                 1 / vi->cameras[vi->active_camera]->r);
    }
 
 
    return 1;
}
 
/*
        draws grid (little dots , with no use)
        params:ViewInfo , global view variable defined in viewport.c
        return value:none
*/
static void glexpose_grid(ViewInfo * vi)
{
    //drawing grids
    float x, y;
    if (vi->gridVisible) {
        glPointSize(1);
        glBegin(GL_POINTS);
        glColor4f(vi->gridColor.R, vi->gridColor.G, vi->gridColor.B,
                  vi->gridColor.A);
        for (x = vi->bdxLeft; x <= vi->bdxRight;
             x = x + vi->gridSize) {
            for (y = vi->bdyBottom; y <= vi->bdyTop;
                 y = y + vi->gridSize) {
                glVertex3f(x, y, 0);
            }
        }
        glEnd();
    }
}
 
/*
        draws active graph depending on graph type
        params:ViewInfo , global view variable defined in viewport.c
        return value:1 if there is a graph to draw else 0 
*/
static int glexpose_drawgraph(ViewInfo * vi)
{
 
    if (vi->activeGraph > -1) {
        if (!vi->Topview->fisheyeParams.active)
            renderSmGraph(vi->Topview);
        else {
            drawtopologicalfisheye(vi->Topview);
        }
 
        return 1;
    }
    return 0;
}
 
/*
        main gl expose ,any time sreen needs to be redrawn, this function is called by gltemplate
        ,all drawings are initialized in this function
        params:ViewInfo , global view variable defined in viewport.c
        return value:0 if something goes wrong with GL 1 , otherwise
*/
int glexpose_main(ViewInfo * vi)
{
    static int doonce = 0;
    if (!glupdatecamera(vi))
        return 0;
 
    if (vi->activeGraph >= 0) {
        if (!doonce) {
            doonce = 1;
            btnToolZoomFit_clicked(NULL, NULL);
            btnToolZoomFit_clicked(NULL, NULL);
        }
    }
    else
        return 0;
 
 
 
    glexpose_grid(vi);
    drawBorders(vi);
    glexpose_drawgraph(vi);
    drawRotatingAxis();
    draw_selpoly(&vi->Topview->sel.selPoly);
    glCompSetDraw(vi->widgets);
 
         /*DEBUG*/ return 1;
}