hierarchy.h

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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 v2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
 *
 * Contributors: Details at https://graphviz.org
 *************************************************************************/
 
#pragma once
 
#include <neatogen/sparsegraph.h>
#include <stdbool.h>
#include <stddef.h>
 
typedef struct {
    int nedges;       // degree, including self-loop
    int *edges;       // neighbors; edges[0] = self
    int size;         // no. of original nodes contained
    int active_level; // Node displayed iff active_level == node's level
 
    // position of node in universal coordinate system
    float x_coord;
    float y_coord;
 
    // position of node in physical (device) coordinate system
    float physical_x_coord;
    float physical_y_coord;     
        //previous coords and active level (for animation)
    float old_physical_x_coord;
    float old_physical_y_coord; 
        int old_active_level;
 
 
} ex_vtx_data;
 
typedef struct {
    int nlevels;
    v_data ** graphs;
    ex_vtx_data ** geom_graphs;
    int * nvtxs;
    int * nedges;
    /* Node i on level k is mapped to coarse node v2cv[k][i] on level k+1
     */
    int ** v2cv;
    /* Coarse node i on level k contains nodes cv2v[k][2*i] and 
     * cv2v[k][2*i+1] on level k-1. If it contains only 1 node, then
     * cv2v[k][2*i+1] will be -1
     */
    int ** cv2v;
} Hierarchy;
 
typedef struct {
    int num_fine_nodes; /* 50 */
    double coarsening_rate; /* 2.5 */
} levelparms_t;
 
Hierarchy *create_hierarchy(v_data *graph, int nvtxs, int nedges,
                            ex_vtx_data *geom_graph, int ngeom_edges,
                            bool dist2_limit);
        
void set_active_levels(Hierarchy*, int*, int, levelparms_t*);
void find_closest_active_node(Hierarchy*, double x, double y, int*);
 
size_t extract_active_logical_coords(Hierarchy *hierarchy, int node, int level,
    double *x_coords, double *y_coords, size_t counter);
int set_active_physical_coords(Hierarchy *, int node, int level,
    double *x_coords, double *y_coords, int counter);
 
void init_active_level(Hierarchy* hierarchy);
 
// creating a geometric graph:
int init_ex_graph(v_data * graph1, v_data * graph2, int n,
   double *x_coords, double *y_coords, ex_vtx_data ** gp);
 
// layout distortion:
void rescale_layout_polar(double * x_coords, double * y_coords, 
    double * x_foci, double * y_foci, int num_foci, size_t n, int interval,
    double width, double height, double distortion);
 
void find_physical_coords(Hierarchy *, int, int, float *x, float *y);
void find_old_physical_coords(Hierarchy *hierarchy, int level, int node,
                              float *x, float *y);
 
void find_active_ancestor_info(Hierarchy * hierarchy, int level, int node, int *levell,int *nodee);
 
void quicksort_place(double *place, int *ordering, size_t size);