svg_vport.c File Reference

Create SVG plot viewports for TPC SVG C library. More...

#include "libtpcsvg.h"
#include <math.h>

Go to the source code of this file.

Functions
void	svg_init_viewport_pos (struct svg_viewport_pos *p)
void	svg_init_coord (struct svg_coord *p)
void	svg_init_viewports (struct svg_viewports *p)
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)

Variables
int	SVG_INLINE

Detailed Description

Create SVG plot viewports for TPC SVG C library.

Author

Vesa Oikonen

Definition in file svg_vport.c.

Function Documentation

svg_define_viewports()

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 )

Define the viewport positions for further use. All measures are in pixels.

Axis tick labels (y axis at least) should be set before calling this, so that enough room for the labels can be reserved.

Returns

Returns pointer to the file if successful and NULL in case of an error.

Parameters

main_viewport_width	Main viewport width (zero if default is used)
main_viewport_height	Main viewport height (zero if default is used)
is_main_title	Is there main title? no=0, yes<>0
is_yaxis_title	Is there y axis title? no=0, yes<>0
is_xaxis_title	Is there x axis title? no=0, yes<>0
is_label_area	Is there label area? no=0, yes<>0
vp	Pointer to structure which will be filled with viewport positions and sizes
verbose	Verbose level; if zero, then nothing is printed to stderr or stdout

Definition at line 65 of file svg_vport.c.

  {
  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);
}

Referenced by plot_fit_svg(), plot_fitrange_svg(), and plot_svg().

svg_init_coord()

void svg_init_coord

(

struct svg_coord *

p

)

Initiate struct svg_coord contents to all-zeroes before use.

Definition at line 26 of file svg_vport.c.

  {
  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;
}

Referenced by svg_init_viewports().

svg_init_viewport_pos()

void svg_init_viewport_pos

(

struct svg_viewport_pos *

p

)

Initiate struct svg_viewport_pos contents to all-zeroes before use.

Definition at line 15 of file svg_vport.c.

  {
  p->is=0;
  p->x=0;
  p->y=0;
  p->w=0;
  p->h=0;
  p->chr_size=0;
}

Referenced by svg_init_viewports().

svg_init_viewports()

void svg_init_viewports

(

struct svg_viewports *

p

)

Initiate struct svg_viewports contents to all-zeroes before use.

Definition at line 43 of file svg_vport.c.

  {
  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);
}

Referenced by plot_fit_svg(), plot_fitrange_svg(), and plot_svg().

Variable Documentation

SVG_INLINE

int SVG_INLINE

extern

Write inline SVG (1) or separate SVG file (0)

Definition at line 12 of file svg_file.c.