gerb_image.c

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/*
 * gEDA - GNU Electronic Design Automation
 * This files is a part of gerbv.
 *
 *   Copyright (C) 2000-2003 Stefan Petersen (spe@stacken.kth.se)
 *
 * $Id$
 *
 * 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <math.h>

#include "gerbv.h"
#include "gerb_image.h"
#include "gerber.h"
#include "amacro.h"

typedef struct {
    int oldAperture;
    int newAperture;
} gerb_translation_entry_t;

gerbv_image_t *
gerbv_create_image(gerbv_image_t *image, const gchar *type)
{
    gerbv_destroy_image(image);
    
    /* Malloc space for image */
    if ((image = (gerbv_image_t *)g_malloc(sizeof(gerbv_image_t))) == NULL) {
       return NULL;
    }
    memset((void *)image, 0, sizeof(gerbv_image_t));
    
    /* Malloc space for image->netlist */
    if ((image->netlist = (gerbv_net_t *)g_malloc(sizeof(gerbv_net_t))) == NULL) {
       g_free(image);
       return NULL;
    }
    memset((void *)image->netlist, 0, sizeof(gerbv_net_t));
    
    /* Malloc space for image->info */
    if ((image->info = (gerbv_image_info_t *)g_malloc(sizeof(gerbv_image_info_t))) == NULL) {
       g_free(image->netlist);
       g_free(image);
       return NULL;
    }
    memset((void *)image->info, 0, sizeof(gerbv_image_info_t));
    
    /* Set aside position for stats struct */
    image->gerbv_stats = NULL;
    image->drill_stats = NULL;

    image->info->min_x = HUGE_VAL;
    image->info->min_y = HUGE_VAL;
    image->info->max_x = -HUGE_VAL;
    image->info->max_y = -HUGE_VAL;

    /* create our first layer and fill with non-zero default values */
    image->layers = g_new0 (gerbv_layer_t, 1);
    image->layers->stepAndRepeat.X = 1;
    image->layers->stepAndRepeat.Y = 1;
    image->layers->polarity = GERBV_POLARITY_DARK;
    
    /* create our first netstate and fill with non-zero default values */
    image->states = g_new0 (gerbv_netstate_t, 1);
    image->states->scaleA = 1;
    image->states->scaleB = 1;

    /* fill in some values for our first net */
    image->netlist->layer = image->layers;
    image->netlist->state = image->states;
    
    if (type == NULL)
       image->info->type = g_strdup ("unknown");
    else
       image->info->type = g_strdup (type);

    /* the individual file parsers will have to set this. */
    image->info->attr_list = NULL;
    image->info->n_attr = 0;

    return image;
}


void
gerbv_destroy_image(gerbv_image_t *image)
{
    int i;
    gerbv_net_t *net, *tmp;
    gerbv_layer_t *layer;
    gerbv_netstate_t *state;
    
    if(image==NULL)
        return;
        
    /*
     * Free apertures
     */
    for (i = 0; i < APERTURE_MAX; i++) 
       if (image->aperture[i] != NULL) {
           g_free(image->aperture[i]);
           image->aperture[i] = NULL;
       }

    /*
     * Free aperture macro
     */
    if (image->amacro)
       free_amacro(image->amacro);

    /*
     * Free format
     */
    if (image->format)
       g_free(image->format);
    
    /*
     * Free info
     */
    if (image->info) {
       if (image->info->name)
           g_free(image->info->name);

       if (image->info->type)
           g_free(image->info->type);

       g_free(image->info);
    }
    
    /*
     * Free netlist
     */
    for (net = image->netlist; net != NULL; ) {
       tmp = net; 
       net = net->next; 
       if (tmp->cirseg != NULL) {
           g_free(tmp->cirseg);
           tmp->cirseg = NULL;
       }
       if (tmp->label) {
              g_string_free (tmp->label, TRUE);
       }
       g_free(tmp);
       tmp = NULL;
    }
    for (layer = image->layers; layer != NULL; ) {
       gerbv_layer_t *tempLayer = layer;
       
       layer = layer->next;
       g_free (tempLayer);
    }
    for (state = image->states; state != NULL; ) {
       gerbv_netstate_t *tempState = state;
       
       state = state->next;
       g_free (tempState);
    }
    /* FIXME -- must write these functions. */
    /*   gerb_transf_free(image->transf); */
    /*   gerb_stats_free(image->gerb_stats); */
    /*   gerb_stats_free(image->drill_stats); */

    /*
     * Free and reset the final image
     */
    g_free(image);
    image = NULL;
    
    return;
}


/*
 * Check that the parsed gerber image is complete.
 * Returned errorcodes are:
 * 0: No problems
 * 1: Missing netlist
 * 2: Missing format
 * 4: Missing apertures
 * 8: Missing info
 * It could be any of above or'ed together
 */
gerb_verify_error_t
gerbv_image_verify(gerbv_image_t const* image)
{
    gerb_verify_error_t error = GERB_IMAGE_OK;
    int i, n_nets;;
    gerbv_net_t *net;

    if (image->netlist == NULL) error |= GERB_IMAGE_MISSING_NETLIST;
    if (image->format == NULL)  error |= GERB_IMAGE_MISSING_FORMAT;
    if (image->info == NULL)    error |= GERB_IMAGE_MISSING_INFO;

    /* Count how many nets we have */
    n_nets = 0;
    if (image->netlist != NULL) {
      for (net = image->netlist->next ; net != NULL; net = net->next) {
       n_nets++;
      }
    }

    /* If we have nets but no apertures are defined, then complain */
    if( n_nets > 0) {
      for (i = 0; i < APERTURE_MAX && image->aperture[i] == NULL; i++);
      if (i == APERTURE_MAX) error |= GERB_IMAGE_MISSING_APERTURES;
    }

    return error;
} /* gerb_image_verify */


static void
gerbv_image_interpolation(gerbv_interpolation_t interpolation)
{
    switch (interpolation) {
    case GERBV_INTERPOLATION_LINEARx1:
       printf("linearX1");
       break;
    case GERBV_INTERPOLATION_x10:
       printf("linearX10");
       break;
    case GERBV_INTERPOLATION_LINEARx01:
       printf("linearX01");
       break;
    case GERBV_INTERPOLATION_LINEARx001:
       printf("linearX001");
       break;
    case GERBV_INTERPOLATION_CW_CIRCULAR:
       printf("CW circular");
       break;
    case GERBV_INTERPOLATION_CCW_CIRCULAR:
       printf("CCW circular");
       break;
    case  GERBV_INTERPOLATION_PAREA_START:
       printf("polygon area start");
       break;
    case  GERBV_INTERPOLATION_PAREA_END:
       printf("polygon area end");
       break;
    default:
       printf("unknown");
    }
} /* gerb_image_interpolation */


/* Dumps a written version of image to stdout */
void 
gerbv_image_dump(gerbv_image_t const* image)
{
    int i, j;
    gerbv_aperture_t * const* aperture;
    gerbv_net_t const * net;

    /* Apertures */
    printf("Apertures:\n");
    aperture = image->aperture;
    for (i = 0; i < APERTURE_MAX; i++) {
       if (aperture[i]) {
           printf(" Aperture no:%d is an ", i);
           switch(aperture[i]->type) {
           case GERBV_APTYPE_CIRCLE:
              printf("circle");
              break;
           case GERBV_APTYPE_RECTANGLE:
              printf("rectangle");
              break;
           case GERBV_APTYPE_OVAL:
              printf("oval");
              break;
           case GERBV_APTYPE_POLYGON:
              printf("polygon");
              break;
           case GERBV_APTYPE_MACRO:
              printf("macro");
              break;
           default:
              printf("unknown");
           }
           for (j = 0; j < aperture[i]->nuf_parameters; j++) {
              printf(" %f", aperture[i]->parameter[j]);
           }
           printf("\n");
       }
    }

    /* Netlist */
    net = image->netlist;
    while (net){
       printf("(%f,%f)->(%f,%f) with %d (", net->start_x, net->start_y, 
              net->stop_x, net->stop_y, net->aperture);
       gerbv_image_interpolation(net->interpolation);
       printf(")\n");
       net = net->next;
    }
} /* gerbv_image_dump */


gerbv_layer_t *
gerbv_image_return_new_layer (gerbv_layer_t *previousLayer)
{
    gerbv_layer_t *newLayer = g_new0 (gerbv_layer_t, 1);
    
    *newLayer = *previousLayer;
    previousLayer->next = newLayer;
    /* clear this boolean so we only draw the knockout once */
    newLayer->knockout.firstInstance = FALSE;
    newLayer->next = NULL;
    
    return newLayer;
} /* gerbv_image_return_new_layer */


gerbv_netstate_t *
gerbv_image_return_new_netstate (gerbv_netstate_t *previousState)
{
    gerbv_netstate_t *newState = g_new0 (gerbv_netstate_t, 1);
    
    *newState = *previousState;
    previousState->next = newState;
    newState->scaleA = 1.0;
    newState->scaleB = 1.0;
    newState->next = NULL;
    
    return newState;
} /* gerbv_image_return_new_netstate */

gerbv_layer_t *
gerbv_image_duplicate_layer (gerbv_layer_t *oldLayer) {
    gerbv_layer_t *newLayer = g_new (gerbv_layer_t,1);
    
    *newLayer = *oldLayer;
    newLayer->name = g_strdup (oldLayer->name);
    return newLayer;
}

gerbv_netstate_t *
gerbv_image_duplicate_state (gerbv_netstate_t *oldState) {
    gerbv_netstate_t *newState = g_new (gerbv_netstate_t,1);
    
    *newState = *oldState;
    return newState;
}

gerbv_aperture_t *
gerbv_image_duplicate_aperture (gerbv_aperture_t *oldAperture){
    gerbv_aperture_t *newAperture = g_new0 (gerbv_aperture_t,1);
    gerbv_simplified_amacro_t *simplifiedMacro, *tempSimplified;
       
    *newAperture = *oldAperture;
         
    /* delete the amacro section, since we really don't need it anymore
    now that we have the simplified section */
    newAperture->amacro = NULL;
    newAperture->simplified = NULL;

    /* copy any simplified macros over */
    tempSimplified = NULL;
    for (simplifiedMacro = oldAperture->simplified; simplifiedMacro != NULL; simplifiedMacro = simplifiedMacro->next) {
       gerbv_simplified_amacro_t *newSimplified = g_new0 (gerbv_simplified_amacro_t,1);
       *newSimplified = *simplifiedMacro;
       if (tempSimplified)
         tempSimplified->next = newSimplified;
       else
         newAperture->simplified = newSimplified;
       tempSimplified = newSimplified;
    }
    return newAperture;
}

void
gerbv_image_copy_all_nets (gerbv_image_t *sourceImage, gerbv_image_t *newImage, gerbv_layer_t *lastLayer,
              gerbv_netstate_t *lastState, gerbv_net_t *lastNet, gerbv_user_transformation_t *transform,
              GArray *translationTable){
    gerbv_netstate_t *oldState,*newSavedState;
    gerbv_layer_t *oldLayer,*newSavedLayer;
    gerbv_net_t *currentNet,*newNet,*newSavedNet;
    int i;
    
    oldLayer = sourceImage->layers;
    oldState = sourceImage->states;
    
    newSavedLayer = lastLayer;
    newSavedState = lastState;
    newSavedNet = lastNet;
    
    /* when copying, skip the first net, since it's always zero due to the way we parse things */
    for (currentNet = sourceImage->netlist->next; currentNet; currentNet = currentNet->next){
      /* check for any new layers and duplicate them if needed */
       if (currentNet->layer != oldLayer) {
         newSavedLayer->next = gerbv_image_duplicate_layer (currentNet->layer);
         newSavedLayer = newSavedLayer->next;
       }
       /* check for any new states and duplicate them if needed */
       if (currentNet->state != oldState) {
         newSavedState->next = gerbv_image_duplicate_state (currentNet->state);
         newSavedState = newSavedState->next;
      }
      /* create and copy the actual net over */
      newNet = g_new (gerbv_net_t,1);
      *newNet = *currentNet;
      
      if (currentNet->cirseg) {
       newNet->cirseg = g_new (gerbv_cirseg_t,1);
       *(newNet->cirseg) = *(currentNet->cirseg);
      }
      
      if (currentNet->label)
       newNet->label = g_string_new(currentNet->label->str);
      
      newNet->state = newSavedState;
      newNet->layer = newSavedLayer;
      /* check if we need to translate the aperture number */
      if (translationTable) {
        for (i=0; i<translationTable->len; i++){
          gerb_translation_entry_t translationEntry=g_array_index (translationTable, gerb_translation_entry_t, i);
          
          if (translationEntry.oldAperture == newNet->aperture) {
            newNet->aperture = translationEntry.newAperture;
            break;
          }
        }
      }
      /* check if we are transforming the net (translating, scaling, etc) */
      if (transform) {
        newNet->start_x += transform->translateX;
        newNet->start_y += transform->translateY;
        newNet->stop_x += transform->translateX;
        newNet->stop_y += transform->translateY;
        if (newNet->cirseg) {
          newNet->cirseg->cp_x += transform->translateX;
          newNet->cirseg->cp_y += transform->translateY;
        }
      }
      if (newSavedNet)
       newSavedNet->next = newNet;
      else
       newImage->netlist = newNet;
      newSavedNet = newNet;
    }         
              
}

gint
gerbv_image_find_existing_aperture_match (gerbv_aperture_t *checkAperture, gerbv_image_t *imageToSearch) {
    int i,j;
    gboolean isMatch;
    
    for (i = APERTURE_MIN; i < APERTURE_MAX; i++) {
       if (imageToSearch->aperture[i] != NULL) {
         if ((imageToSearch->aperture[i]->type == checkAperture->type) &&
             (imageToSearch->aperture[i]->simplified == NULL) &&
             (imageToSearch->aperture[i]->unit == checkAperture->unit)) {
           /* check all parameters match too */
           isMatch=TRUE;
           for (j=0; j<APERTURE_PARAMETERS_MAX; j++){
             if (imageToSearch->aperture[i]->parameter[j] != checkAperture->parameter[j])
               isMatch = FALSE;
           }
           if (isMatch)
             return i;
         }          
       }
    }
    return 0;
}

int
gerbv_image_find_unused_aperture_number (int startIndex, gerbv_image_t *image){
    int i;
    
    for (i = startIndex; i < APERTURE_MAX; i++) {
       if (image->aperture[i] == NULL) {
         return i;
       }
    }
    return -1;
}

gerbv_image_t *
gerbv_image_duplicate_image (gerbv_image_t *sourceImage, gerbv_user_transformation_t *transform) {
    gerbv_image_t *newImage = gerbv_create_image(NULL, sourceImage->info->type);
    int i;
    int lastUsedApertureNumber = APERTURE_MIN - 1;
    GArray *apertureNumberTable = g_array_new(FALSE,FALSE,sizeof(gerb_translation_entry_t));
    
    newImage->layertype = sourceImage->layertype;
    /* copy information layer over */
    *(newImage->info) = *(sourceImage->info);
    newImage->info->name = g_strdup (sourceImage->info->name);
    newImage->info->type = g_strdup (sourceImage->info->type);
    newImage->info->plotterFilm = g_strdup (sourceImage->info->plotterFilm);
    
    /* copy apertures over, compressing all the numbers down for a cleaner output */
    for (i = APERTURE_MIN; i < APERTURE_MAX; i++) {
       if (sourceImage->aperture[i] != NULL) {
         gerbv_aperture_t *newAperture = gerbv_image_duplicate_aperture (sourceImage->aperture[i]);

         lastUsedApertureNumber = gerbv_image_find_unused_aperture_number (lastUsedApertureNumber + 1, newImage);
         /* store the aperture numbers (new and old) in the translation table */
         gerb_translation_entry_t translationEntry={i,lastUsedApertureNumber};
         g_array_append_val (apertureNumberTable,translationEntry);

         newImage->aperture[lastUsedApertureNumber] = newAperture;
       }
    }
    
    /* step through all nets and create new layers and states on the fly, since
       we really don't have any other way to figure out where states and layers are used */
    gerbv_image_copy_all_nets (sourceImage, newImage, newImage->layers, newImage->states, NULL, transform, apertureNumberTable);
    g_array_free (apertureNumberTable, TRUE);
    return newImage;
}

void
gerbv_image_copy_image (gerbv_image_t *sourceImage, gerbv_user_transformation_t *transform, gerbv_image_t *destinationImage) {
    int lastUsedApertureNumber = APERTURE_MIN - 1;
    int i;
    GArray *apertureNumberTable = g_array_new(FALSE,FALSE,sizeof(gerb_translation_entry_t));
    
    /* copy apertures over */
    for (i = APERTURE_MIN; i < APERTURE_MAX; i++) {
       if (sourceImage->aperture[i] != NULL) {
         gint existingAperture = gerbv_image_find_existing_aperture_match (sourceImage->aperture[i], destinationImage);
         
         /* if we already have an existing aperture in the destination image that matches what
            we want, just use it instead */
         if (existingAperture > 0) {
              gerb_translation_entry_t translationEntry={i,existingAperture};
              g_array_append_val (apertureNumberTable,translationEntry);
         }
         /* else, create a new aperture and put it in the destination image */
         else {
              gerbv_aperture_t *newAperture = gerbv_image_duplicate_aperture (sourceImage->aperture[i]);
         
              lastUsedApertureNumber = gerbv_image_find_unused_aperture_number (lastUsedApertureNumber + 1, destinationImage);
              /* store the aperture numbers (new and old) in the translation table */
              gerb_translation_entry_t translationEntry={i,lastUsedApertureNumber};
              g_array_append_val (apertureNumberTable,translationEntry);

              destinationImage->aperture[lastUsedApertureNumber] = newAperture;
         }
       }
    }
    /* find the last layer, state, and net in the linked chains */
    gerbv_netstate_t *lastState;
    gerbv_layer_t *lastLayer;
    gerbv_net_t *lastNet;
    
    for (lastState = destinationImage->states; lastState->next; lastState=lastState->next){}
    for (lastLayer = destinationImage->layers; lastLayer->next; lastLayer=lastLayer->next){}
    for (lastNet = destinationImage->netlist; lastNet->next; lastNet=lastNet->next){}
    
    /* and then copy them all to the destination image, using the aperture translation table we just built */
    gerbv_image_copy_all_nets (sourceImage, destinationImage, lastLayer, lastState, lastNet, transform, apertureNumberTable);
    g_array_free (apertureNumberTable, TRUE);
}

void
gerbv_image_delete_net (gerbv_net_t *currentNet) {
       gerbv_net_t *tempNet;
       
       g_assert (currentNet);
       /* we have a match, so just zero out all the important data fields */
       currentNet->aperture = 0;
       currentNet->aperture_state = GERBV_APERTURE_STATE_OFF;
       
       /* if this is a polygon start, we need to erase all the rest of the
               nets in this polygon too */
       if (currentNet->interpolation == GERBV_INTERPOLATION_PAREA_START){
              for (tempNet = currentNet->next; tempNet; tempNet = tempNet->next){   
                     tempNet->aperture = 0;
                     tempNet->aperture_state = GERBV_APERTURE_STATE_OFF;
                     
                     if (tempNet->interpolation == GERBV_INTERPOLATION_PAREA_END) {
                            tempNet->interpolation = GERBV_INTERPOLATION_DELETED;
                            break;
                     }
                     /* make sure we don't leave a polygon interpolation in, since
                      it will still draw if it is */
                     tempNet->interpolation = GERBV_INTERPOLATION_DELETED;
              }
       }
       /* make sure we don't leave a polygon interpolation in, since
          it will still draw if it is */
       currentNet->interpolation = GERBV_INTERPOLATION_DELETED;
}

void
gerbv_image_delete_selected_nets (gerbv_image_t *sourceImage, GArray *selectedNodeArray) {
       int i;
       gerbv_net_t *currentNet;
    
       for (currentNet = sourceImage->netlist; currentNet; currentNet = currentNet->next){ 
              for (i=0; i<selectedNodeArray->len; i++){
                     gerbv_selection_item_t sItem = g_array_index (selectedNodeArray,
                            gerbv_selection_item_t, i);
                     if (sItem.net == currentNet) {
                            gerbv_image_delete_net (currentNet);
                            
                     }
              }
       }
}

void
gerbv_image_create_rectangle_object (gerbv_image_t *image, gdouble coordinateX,
              gdouble coordinateY, gdouble width, gdouble height) {
       gerbv_net_t *currentNet;
       
       /* run through and find last net pointer */
       for (currentNet = image->netlist; currentNet->next; currentNet = currentNet->next){}
       
       /* create the polygon start node */
       currentNet = gerber_create_new_net (currentNet, NULL, NULL);
       currentNet->interpolation = GERBV_INTERPOLATION_PAREA_START;
       
       /* draw the 4 corners */
       currentNet = gerber_create_new_net (currentNet, NULL, NULL);
       currentNet->interpolation = GERBV_INTERPOLATION_LINEARx1;
       currentNet->aperture_state = GERBV_APERTURE_STATE_ON;
       currentNet->start_x = coordinateX;
       currentNet->start_y = coordinateY;
       currentNet->stop_x = coordinateX + width;
       currentNet->stop_y = coordinateY;
       
       currentNet = gerber_create_new_net (currentNet, NULL, NULL);
       currentNet->interpolation = GERBV_INTERPOLATION_LINEARx1;
       currentNet->aperture_state = GERBV_APERTURE_STATE_ON;
       currentNet->stop_x = coordinateX + width;
       currentNet->stop_y = coordinateY + height;
       
       currentNet = gerber_create_new_net (currentNet, NULL, NULL);
       currentNet->interpolation = GERBV_INTERPOLATION_LINEARx1;
       currentNet->aperture_state = GERBV_APERTURE_STATE_ON;
       currentNet->stop_x = coordinateX;
       currentNet->stop_y = coordinateY + height;
       
       currentNet = gerber_create_new_net (currentNet, NULL, NULL);
       currentNet->interpolation = GERBV_INTERPOLATION_LINEARx1;
       currentNet->aperture_state = GERBV_APERTURE_STATE_ON;
       currentNet->stop_x = coordinateX;
       currentNet->stop_y = coordinateY;
       
       /* create the polygon end node */
       currentNet = gerber_create_new_net (currentNet, NULL, NULL);
       currentNet->interpolation = GERBV_INTERPOLATION_PAREA_END;
       
       return;
}

gerbv_net_t *
gerb_image_return_aperture_index (gerbv_image_t *image, gdouble lineWidth, int *apertureIndex){
       gerbv_net_t *currentNet;
       gerbv_aperture_t *aperture=NULL;
       int i;
              
       /* run through and find last net pointer */
       for (currentNet = image->netlist; currentNet->next; currentNet = currentNet->next){}
       
       /* try to find an existing aperture that matches the requested width and type */
       for (i = APERTURE_MIN; i < APERTURE_MAX; i++) {
              if (image->aperture[i] != NULL) {
                     if ((image->aperture[i]->type == GERBV_APTYPE_CIRCLE) && 
                            (fabs (image->aperture[i]->parameter[0] - lineWidth) < 0.001)){
                            aperture = image->aperture[i];
                            *apertureIndex = i;
                            break;
                     }
              }
       }

       if (!aperture) {
              /* we didn't find a useable old aperture, so create a new one */
              if (!gerber_create_new_aperture (image, apertureIndex,
                            GERBV_APTYPE_CIRCLE, lineWidth, 0)) {
                     /* if we didn't succeed, then return */
                     return FALSE;
              }
       }
       return currentNet;
}

void
gerbv_image_create_arc_object (gerbv_image_t *image, gdouble centerX, gdouble centerY,
              gdouble radius, gdouble startAngle, gdouble endAngle, gdouble lineWidth,
              gerbv_aperture_type_t apertureType) {
       int apertureIndex;
       gerbv_net_t *currentNet;
       gerbv_cirseg_t cirSeg = {centerX, centerY, radius, radius, startAngle, endAngle};
       
       currentNet = gerb_image_return_aperture_index(image, lineWidth, &apertureIndex);
       
       if (!currentNet)
              return;
       
       /* draw the arc */
       currentNet = gerber_create_new_net (currentNet, NULL, NULL);
       currentNet->interpolation = GERBV_INTERPOLATION_CCW_CIRCULAR;
       currentNet->aperture_state = GERBV_APERTURE_STATE_ON;
       currentNet->aperture = apertureIndex;
       currentNet->start_x = centerX + (cos(startAngle*M_PI/180) * radius);
       currentNet->start_y = centerY + (sin(startAngle*M_PI/180) * radius);
       currentNet->stop_x = centerX + (cos(endAngle*M_PI/180) * radius);
       currentNet->stop_y = centerY + (sin(endAngle*M_PI/180) * radius);;
       currentNet->cirseg = g_new0 (gerbv_cirseg_t,1);
       *(currentNet->cirseg) = cirSeg;
       
       return;
}

void
gerbv_image_create_line_object (gerbv_image_t *image, gdouble startX, gdouble startY,
              gdouble endX, gdouble endY, gdouble lineWidth, gerbv_aperture_type_t apertureType) {
       int apertureIndex;
       gerbv_net_t *currentNet;
       
       currentNet = gerb_image_return_aperture_index(image, lineWidth, &apertureIndex);
       
       if (!currentNet)
              return;
       
       /* draw the line */
       currentNet = gerber_create_new_net (currentNet, NULL, NULL);
       currentNet->interpolation = GERBV_INTERPOLATION_LINEARx1;
       
       /* if the start and end coordinates are the same, use a "flash" aperture state */
       if ((fabs(startX - endX) < 0.001) && (fabs(startY - endY) < 0.001))
              currentNet->aperture_state = GERBV_APERTURE_STATE_FLASH;
       else
              currentNet->aperture_state = GERBV_APERTURE_STATE_ON;
       currentNet->aperture = apertureIndex;
       currentNet->start_x = startX;
       currentNet->start_y = startY;
       currentNet->stop_x = endX;
       currentNet->stop_y = endY;

       return;
}

void
gerbv_image_create_window_pane_objects (gerbv_image_t *image, gdouble lowerLeftX,
              gdouble lowerLeftY, gdouble width, gdouble height, gdouble areaReduction,
              gint paneRows, gint paneColumns, gdouble paneSeparation){
       int i,j;
       gdouble startX,startY,boxWidth,boxHeight;
       
       startX = lowerLeftX + (areaReduction * width) / 2.0;
       startY = lowerLeftY + (areaReduction * height) / 2.0;
       boxWidth = (width * (1.0 - areaReduction) - (paneSeparation * (paneColumns - 1))) / paneColumns;
       boxHeight = (height * (1.0 - areaReduction) - (paneSeparation * (paneRows - 1))) / paneRows;
       
       for (i=0; i<paneColumns; i++){
              for (j=0; j<paneRows; j++) {
                     gerbv_image_create_rectangle_object (image, startX + (i * (boxWidth + paneSeparation)),
                            startY + (j * (boxHeight + paneSeparation)),boxWidth, boxHeight);
              }
       }

       return;
}
              
gboolean
gerbv_image_reduce_area_of_selected_objects (GArray *selectionArray,
              gdouble areaReduction, gint paneRows, gint paneColumns, gdouble paneSeparation){
       int i;
       gdouble minX,minY,maxX,maxY;
       
       for (i=0; i<selectionArray->len; i++) {
              gerbv_selection_item_t sItem = g_array_index (selectionArray,gerbv_selection_item_t, i);
              gerbv_image_t *image = sItem.image;
              gerbv_net_t *currentNet = sItem.net;
              
              /* determine the object type first */
              minX = HUGE_VAL;
              maxX = -HUGE_VAL;
              minY = HUGE_VAL;
              maxY = -HUGE_VAL;
              
              if (currentNet->interpolation == GERBV_INTERPOLATION_PAREA_START) {
                     /* if it's a polygon, just determine the overall area of it and delete it */
                     currentNet->interpolation = GERBV_INTERPOLATION_DELETED;
                     
                     for (currentNet = currentNet->next; currentNet; currentNet = currentNet->next){
                            if (currentNet->interpolation == GERBV_INTERPOLATION_PAREA_END)
                                   break;
                            currentNet->interpolation = GERBV_INTERPOLATION_DELETED;
                            if (currentNet->stop_x < minX)
                                   minX = currentNet->stop_x;
                            if (currentNet->stop_y < minY)
                                   minY = currentNet->stop_y;
                            if (currentNet->stop_x > maxX)
                                   maxX = currentNet->stop_x;
                            if (currentNet->stop_y > maxY)
                                   maxY = currentNet->stop_y;
                     }
                     currentNet->interpolation = GERBV_INTERPOLATION_DELETED;
              }
              else if ((currentNet->interpolation == GERBV_INTERPOLATION_x10) ||
                            (currentNet->interpolation == GERBV_INTERPOLATION_LINEARx01) ||
                            (currentNet->interpolation == GERBV_INTERPOLATION_LINEARx001) ||
                            (currentNet->interpolation == GERBV_INTERPOLATION_LINEARx1)) {
                     gdouble dx=0,dy=0;
                     /* figure out the overall size of this element */
                     switch (image->aperture[currentNet->aperture]->type) {
                            case GERBV_APTYPE_CIRCLE :
                            case GERBV_APTYPE_OVAL :
                            case GERBV_APTYPE_POLYGON :
                                   dx = dy = image->aperture[currentNet->aperture]->parameter[0];
                                   break;
                            case GERBV_APTYPE_RECTANGLE :
                                   dx = (image->aperture[currentNet->aperture]->parameter[0]/ 2);
                                   dy = (image->aperture[currentNet->aperture]->parameter[1]/ 2);
                                   break;
                            default :
                                   break;
                     }
                     if (currentNet->start_x-dx < minX)
                            minX = currentNet->start_x-dx;
                     if (currentNet->start_y-dy < minY)
                            minY = currentNet->start_y-dy;
                     if (currentNet->start_x+dx > maxX)
                            maxX = currentNet->start_x+dx;
                     if (currentNet->start_y+dy > maxY)
                            maxY = currentNet->start_y+dy;
                            
                     if (currentNet->stop_x-dx < minX)
                            minX = currentNet->stop_x-dx;
                     if (currentNet->stop_y-dy < minY)
                            minY = currentNet->stop_y-dy;
                     if (currentNet->stop_x+dx > maxX)
                            maxX = currentNet->stop_x+dx;
                     if (currentNet->stop_y+dy > maxY)
                            maxY = currentNet->stop_y+dy;
                     
                     /* finally, delete node */
                     currentNet->interpolation = GERBV_INTERPOLATION_DELETED;
              }
              /* we don't current support arcs */
              else
                     return FALSE;
              
              /* create new structures */
              gerbv_image_create_window_pane_objects (image, minX, minY, maxX - minX, maxY - minY,
                     areaReduction, paneRows, paneColumns, paneSeparation);
       }
       return TRUE;
}

gboolean
gerbv_image_move_selected_objects (GArray *selectionArray, gdouble translationX,
              gdouble translationY) {
       int i;
       
       for (i=0; i<selectionArray->len; i++) {
              gerbv_selection_item_t sItem = g_array_index (selectionArray,gerbv_selection_item_t, i);
              gerbv_net_t *currentNet = sItem.net;

              if (currentNet->interpolation == GERBV_INTERPOLATION_PAREA_START) {
                     /* if it's a polygon, step through every vertex and translate the point */
                     for (currentNet = currentNet->next; currentNet; currentNet = currentNet->next){
                            if (currentNet->interpolation == GERBV_INTERPOLATION_PAREA_END)
                                   break;
                            currentNet->start_x += translationX;
                            currentNet->start_y += translationY;
                            currentNet->stop_x += translationX;
                            currentNet->stop_y += translationY;
                     }
              }
              else {
                     /* otherwise, just move the single element */
                     currentNet->start_x += translationX;
                     currentNet->start_y += translationY;
                     currentNet->stop_x += translationX;
                     currentNet->stop_y += translationY;
              }
       }
       return TRUE;
}

gerbv_net_t *
gerbv_image_return_next_renderable_object (gerbv_net_t *oldNet) {
       gerbv_net_t *currentNet=oldNet;
       
       if (currentNet->interpolation == GERBV_INTERPOLATION_PAREA_START) {
              /* if it's a polygon, step to the next non-polygon net */
              for (currentNet = currentNet->next; currentNet; currentNet = currentNet->next){
                     if (currentNet->interpolation == GERBV_INTERPOLATION_PAREA_END) {
                            return currentNet->next;
                     }
              }
              return NULL;
       }
       else {
              return currentNet->next;
       }
}