svg_vport.c

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#include "libtpcsvg.h"
#include <math.h>
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extern int SVG_INLINE;
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void svg_init_viewport_pos(
  struct svg_viewport_pos *p
) {
  p->is=0;
  p->x=0;
  p->y=0;
  p->w=0;
  p->h=0;
  p->chr_size=0;
}
void svg_init_coord(
  struct svg_coord *p
) {
  p->min=0;
  p->max=0;
  p->scale=0.0;
  p->origo=0.0;
  p->tick_nr=0;
  for(int i=0; i<MAX_TICK_NR; i++) p->tick[i]=0.0;
  p->tickscale=0.0;
  p->tick_decimals=0.0;
  for(int i=0; i<MAX_TICK_NR; i++) p->tick_label[i][0]=(char)0;
  p->upper_margin=0;
  p->fixed_min=0;
  p->fixed_max=0;
}
void svg_init_viewports(
  struct svg_viewports *p
) {
  svg_init_viewport_pos(&p->main_viewport);
  svg_init_viewport_pos(&p->main_title_viewport);
  svg_init_viewport_pos(&p->yaxis_title_viewport);
  svg_init_viewport_pos(&p->xaxis_title_viewport);
  svg_init_viewport_pos(&p->label_area_viewport);
  svg_init_viewport_pos(&p->plot_area_viewport);
  svg_init_viewport_pos(&p->coordinate_area_viewport);
  svg_init_coord(&p->x);
  svg_init_coord(&p->y);
}
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/*****************************************************************************/
int svg_define_viewports(
  const int main_viewport_width,
  const int main_viewport_height,
  const int is_main_title,
  const int is_yaxis_title,
  const int is_xaxis_title,
  const int is_label_area,
  struct svg_viewports *vp,
  int verbose
) {
  int ti, m, n;
 
  if(verbose>0)
    printf("%s(%d, %d, %d, %d, %d, %d, vp, %d)\n", __func__,
      main_viewport_width, main_viewport_height, is_main_title, is_yaxis_title,
      is_xaxis_title, is_label_area, verbose);
 
  if(vp==NULL) return(1);
  /* Set main viewport */
  vp->main_viewport.is=1; vp->main_viewport.x=vp->main_viewport.y=0;
  if(main_viewport_width<1) vp->main_viewport.w=SVG_VIEWPORT_WIDTH;
  if(main_viewport_height<1) vp->main_viewport.h=SVG_VIEWPORT_HEIGHT;
  /* Set viewport for main title(s) */
  if(is_main_title==0) {
    vp->main_title_viewport.is=0;
    vp->main_title_viewport.x=vp->main_title_viewport.y=0;
    vp->main_title_viewport.w=vp->main_title_viewport.h=0;
    vp->main_title_viewport.chr_size=0;
  } else {
    vp->main_title_viewport.is=1;
    vp->main_title_viewport.x=vp->main_title_viewport.y=0;
    vp->main_title_viewport.w=vp->main_viewport.w;
    vp->main_title_viewport.h=vp->main_viewport.w/12;
    vp->main_title_viewport.chr_size=5*vp->main_title_viewport.h/10;
  }
  /* Set viewport for x axis title */
  if(is_xaxis_title==0) {
    vp->xaxis_title_viewport.is=0;
    vp->xaxis_title_viewport.x=0;
    vp->xaxis_title_viewport.y=vp->main_title_viewport.h;
    vp->xaxis_title_viewport.w=vp->main_title_viewport.w;
    vp->xaxis_title_viewport.h=0;
    vp->xaxis_title_viewport.chr_size=0;
  } else {
    vp->xaxis_title_viewport.is=1;
    vp->xaxis_title_viewport.x=0;
    vp->xaxis_title_viewport.w=vp->main_viewport.w;
    vp->xaxis_title_viewport.h=vp->main_viewport.h/18;
    vp->xaxis_title_viewport.y=vp->main_viewport.h-vp->xaxis_title_viewport.h;
    vp->xaxis_title_viewport.chr_size=7*vp->xaxis_title_viewport.h/10;
  }
  /* Set viewport for y axis title */
  if(is_yaxis_title==0) {
    vp->yaxis_title_viewport.is=0;
    vp->yaxis_title_viewport.x=0;
    vp->yaxis_title_viewport.y=vp->main_title_viewport.h;
    vp->yaxis_title_viewport.w=0;
    vp->yaxis_title_viewport.h=vp->main_viewport.h-vp->main_title_viewport.h-vp->xaxis_title_viewport.h;
    vp->yaxis_title_viewport.chr_size=0;
  } else {
    vp->yaxis_title_viewport.is=1;
    vp->yaxis_title_viewport.x=0;
    vp->yaxis_title_viewport.y=vp->main_title_viewport.h;
    vp->yaxis_title_viewport.w=vp->main_viewport.w/18;
    vp->yaxis_title_viewport.h=vp->main_viewport.h-vp->main_title_viewport.h-vp->xaxis_title_viewport.h;
    if(vp->xaxis_title_viewport.is)
      vp->yaxis_title_viewport.chr_size=vp->xaxis_title_viewport.chr_size;
    else
      vp->yaxis_title_viewport.chr_size=7*vp->yaxis_title_viewport.w/10;
  }
  /* Set viewport for label area */
  if(is_label_area==0) {
    vp->label_area_viewport.is=0;
    vp->label_area_viewport.x=vp->main_viewport.w;
    vp->label_area_viewport.y=vp->main_title_viewport.h;
    vp->label_area_viewport.w=0;
    vp->label_area_viewport.h=vp->main_viewport.h-vp->main_title_viewport.h-vp->xaxis_title_viewport.h;
  } else {
    vp->label_area_viewport.is=1;
    vp->label_area_viewport.x=3*vp->main_viewport.w/4;
    vp->label_area_viewport.y=vp->main_title_viewport.h;
    vp->label_area_viewport.w=vp->main_viewport.w-vp->label_area_viewport.x;
    vp->label_area_viewport.h=vp->main_viewport.h-vp->main_title_viewport.h-vp->xaxis_title_viewport.h;
  }
  /* Set viewport for plot area */
  vp->plot_area_viewport.is=1;
  vp->plot_area_viewport.x=vp->yaxis_title_viewport.w;
  vp->plot_area_viewport.y=vp->main_title_viewport.h;
  vp->plot_area_viewport.w=vp->main_viewport.w-vp->yaxis_title_viewport.w-vp->label_area_viewport.w;
  vp->plot_area_viewport.h=vp->main_viewport.h-vp->main_title_viewport.h-vp->xaxis_title_viewport.h;
  /* Set plot area contents (inside plot area) */
  vp->coordinate_area_viewport.is=1;
  for(ti=m=0; ti<vp->y.tick_nr; ti++) {n=strlen(vp->y.tick_label[ti]); if(n>m) m=n;}
  if(verbose>2) printf("max_yaxis_label_len=%d\n", m);
  if(m<3) vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/14;
  else if(m<5) vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/10;
  else if(m<7) vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/7; // prev 8
  else vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/4; // prev 5
  vp->coordinate_area_viewport.y=0;
  vp->coordinate_area_viewport.w=vp->plot_area_viewport.w-vp->coordinate_area_viewport.x;
  vp->coordinate_area_viewport.h=19*vp->plot_area_viewport.h/20;
  /* Calculate the character size for tick labels etc */
  vp->plot_area_viewport.chr_size=vp->coordinate_area_viewport.chr_size=
    ceil(0.62*(double)(vp->plot_area_viewport.h-vp->coordinate_area_viewport.h)); // prev 0.67
 
  if(verbose>3) printf("coordinate_area_viewport.h := %d\n", vp->coordinate_area_viewport.h);
 
  return(0);
}
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