graph_framebuffer.c File Reference

#include "graph_framebuffer.h"
#include "shape.h"
#include <math.h>
#include <stdio.h>
#include <string.h>

Include dependency graph for graph_framebuffer.c:

Go to the source code of this file.

Functions
void	FBDrawFullscreenGraph (framebuffer fb, graph *g)
void	FBEraseFullscreenGraph (framebuffer fb, graph *g)
void	FBEraseFullscreenGraphData (framebuffer fb, graph *g)
void	FBDrawGraph (framebuffer fb, graph *g, point *top_left_corner, pixel_t width, pixel_t height)
void	FBEraseGraph (framebuffer fb, graph *g, point *top_left_corner, pixel_t width, pixel_t height)
void	FBEraseGraphData (framebuffer fb, graph *g, point *top_left_corner, pixel_t width, pixel_t height)
private void	_FBDrawGraphBounds (framebuffer fb, graph *g, pixel_t x_range_padding, pixel_t y_range_padding, point *top_left_corner, pixel_t width, pixel_t height, shade_t shade)
private void	_FBDrawGraphData (framebuffer fb, graph *g, point *top_left_corner, shade_t shade)
private void	_FBDrawGraphTitle (framebuffer fb, graph *g)
private void	_FBDrawGraphAxesTitles (framebuffer fb, graph *g)
private void	_FBDrawGraphAxesScale (framebuffer fb, graph *g)
unsigned char	max_uc (unsigned char one, unsigned char two)
pixel_t	_FBPixelHeightOfString (char *str)
private pixel_t	_FBPixelWidthOfString (char *str)
private pixel_t	_FBPixelWidthOfLong (long l)
private pixel_t	_FBPixelHeightOfLong (long l)

Function Documentation

private void _FBDrawGraphAxesScale	(	framebuffer	fb,
		graph *	g
	)

Definition at line 245 of file graph_framebuffer.c.

Referenced by FBDrawGraph(), and FBEraseGraph().

                                                             {

}

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private void _FBDrawGraphAxesTitles	(	framebuffer	fb,
		graph *	g
	)

Definition at line 240 of file graph_framebuffer.c.

Referenced by FBDrawGraph(), and FBEraseGraph().

                                                              {

}

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private void _FBDrawGraphBounds	(	framebuffer	fb,
		graph *	g,
		pixel_t	x_range_padding,
		pixel_t	y_range_padding,
		point *	top_left_corner,
		pixel_t	width,
		pixel_t	height,
		shade_t	shade
	)

Definition at line 159 of file graph_framebuffer.c.

References shape_create_point(), point::x, and point::y.

Referenced by FBDrawGraph(), and FBEraseGraph().

                                               {
  /* Draw X axis boundaries (aka vertical lines) */
  FBDrawAnonLine(fb,
                 shape_create_point(top_left_corner->x + x_range_padding,
                               top_left_corner->y,
                               shade),
                 shape_create_point(top_left_corner->x + x_range_padding,
                               top_left_corner->y + (height - y_range_padding),
                               shade),
                 shade);
  /* Draw Y axis boundaries (aka horizontal lines) */
  FBDrawAnonLine(fb,
                 shape_create_point(top_left_corner->x + x_range_padding,
                               top_left_corner->y + height - y_range_padding,
                               shade),
                 shape_create_point(top_left_corner->x + x_range_padding + width,
                               top_left_corner->y + height - y_range_padding,
                               shade),
                 shade);
}

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private void _FBDrawGraphData	(	framebuffer	fb,
		graph *	g,
		point *	top_left_corner,
		shade_t	shade
	)

Definition at line 198 of file graph_framebuffer.c.

References graph::all_data_points_valid, graph::data, GL_BLANK_STEPS_PRECEEDING_STALE_DATA, graph::most_recent_data_point, pixel_t, shape_create_point(), when, graph::x_max, graph::x_min, graph::x_pixel_end, graph::x_pixel_start, graph::y_max, graph::y_min, graph::y_pixel_end, and graph::y_pixel_start.

Referenced by FBDrawGraph(), FBEraseGraph(), and FBEraseGraphData().

                                                                                               {

  long idx = 0;
  /* Temporary variables reused in printfs */
  pixel_t x1, x2, y1, y2;
  /* Set this to true from lldb/gdb to see useful debugging information */
  bool debug = true;

  for(idx=0;
      (((g->all_data_points_valid == true) && (idx < g->x_index_max-1))) ||
        (g->all_data_points_valid == false && (idx < (g->most_recent_data_point - 1)));
      ++idx) {

    fprintf(stderr, "Printing index %ld\n", idx);

    if ((idx <= g->most_recent_data_point) &&
        (idx > g->most_recent_data_point + GL_BLANK_STEPS_PRECEEDING_STALE_DATA)) {
      /* Draw nothing */
      when (debug) {fprintf(stderr, "Not drawing this cycle [idx:%ld]\n", idx);}
    } else {

      x1 = g->x_pixel_start + ((idx)*(g->x_pixel_end-g->x_pixel_start)/(g->x_max-g->x_min));
      y1 = g->y_pixel_end   - ((g->data[idx]+g->y_min)*(g->y_pixel_end-g->y_pixel_start)/(g->y_max-g->y_min));
      x2 = g->x_pixel_start + ((idx+1)*(g->x_pixel_end-g->x_pixel_start)/(g->x_max-g->x_min));
      y2 = g->y_pixel_end   - ((g->data[idx+1]+g->y_min)*(g->y_pixel_end-g->y_pixel_start)/(g->y_max-g->y_min));

      FBDrawAnonLine(fb,
                     shape_create_point(x1, y1, shade),
                     shape_create_point(x2, y2, shade),
                     shade);

      when (debug) {fprintf(stderr, "Line from:\t(%u,\t%u) to (%u,\t%u)\n",x1,y1,x2,y2);}
    }
  }
}

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private void _FBDrawGraphTitle	(	framebuffer	fb,
		graph *	g
	)

Definition at line 235 of file graph_framebuffer.c.

Referenced by FBDrawGraph(), and FBEraseGraph().

                                                         {

}

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private pixel_t _FBPixelHeightOfLong

(

long

l

)

Definition at line 293 of file graph_framebuffer.c.

                                             {
  // 2 pixels because we want one to pad the top and one on the bottom
  return VALVANO_FONT_LINE_SPACING + VALVANO_FONT_HEIGHT;
}

pixel_t _FBPixelHeightOfString

(

char *

str

)

Definition at line 264 of file graph_framebuffer.c.

                                          {
  /* TODO: consider line wrapping */
  return VALVANO_FONT_LINE_SPACING + VALVANO_FONT_HEIGHT;
}

private pixel_t _FBPixelWidthOfLong

(

long

l

)

Definition at line 283 of file graph_framebuffer.c.

                                            {
  // 2 pixels because we want one to pad the front and one on the back
  return VALVANO_FONT_KERNING + (log(l) * VALVANO_FONT_WIDTH);
}

private pixel_t _FBPixelWidthOfString

(

char *

str

)

Definition at line 274 of file graph_framebuffer.c.

                                                 {
  return VALVANO_FONT_KERNING + ((VALVANO_FONT_KERNING + VALVANO_FONT_WIDTH) * strlen(str));
}

void FBDrawFullscreenGraph	(	framebuffer	fb,
		graph *	g
	)

Definition at line 25 of file graph_framebuffer.c.

References FBDrawGraph(), OLED_HEIGHT, OLED_WIDTH, pixel_t, shade_t, and shape_create_point().

Referenced by main().

                                                     {
  point* origin = shape_create_point((pixel_t) 0, (pixel_t) 0, (shade_t) 15);
  FBDrawGraph(fb, g, origin, (pixel_t) OLED_WIDTH, (pixel_t) OLED_HEIGHT);
  SHDestroyPoint(origin);
}

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void FBDrawGraph	(	framebuffer	fb,
		graph *	g,
		point *	top_left_corner,
		pixel_t	width,
		pixel_t	height
	)

Definition at line 73 of file graph_framebuffer.c.

References _FBDrawGraphAxesScale(), _FBDrawGraphAxesTitles(), _FBDrawGraphBounds(), _FBDrawGraphData(), _FBDrawGraphTitle(), pixel_t, point::shade, point::x, graph::x_max, graph::x_min, graph::x_pixel_end, graph::x_pixel_start, point::y, graph::y_max, graph::y_min, graph::y_pixel_end, and graph::y_pixel_start.

Referenced by FBDrawFullscreenGraph().

                                                {
  /* Determine how many pixels to reserve for the scale numbers next
   * to the axes */
  pixel_t x_range_padding = max_pixel_width_of_long(g->y_min, g->y_max);
  pixel_t y_range_padding = max_pixel_height_of_long(g->x_min, g->x_max);

  /* {x,y}_pixel_{start,end} information in /resources/2014-04-07 10.07.01.jpg */
  g->x_pixel_start = top_left_corner->x + x_range_padding;
  g->x_pixel_end   = top_left_corner->x + width;
  g->y_pixel_start = top_left_corner->y;
  g->y_pixel_end   = top_left_corner->y + height - 2 - y_range_padding;

  _FBDrawGraphBounds(fb, g, x_range_padding, y_range_padding, top_left_corner, width, height, top_left_corner->shade);
  _FBDrawGraphData(fb, g, top_left_corner, top_left_corner->shade);
  _FBDrawGraphTitle(fb, g);
  _FBDrawGraphAxesTitles(fb, g);
  _FBDrawGraphAxesScale(fb, g);
}

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void FBEraseFullscreenGraph	(	framebuffer	fb,
		graph *	g
	)

Definition at line 38 of file graph_framebuffer.c.

References FB_COLOR_ERASE, FBEraseGraph(), OLED_HEIGHT, OLED_WIDTH, shade_t, shape_create_point(), x_pixel_t, and y_pixel_t.

Referenced by main().

                                                      {
  point* origin = shape_create_point((x_pixel_t) 0, (y_pixel_t) 0, (shade_t) FB_COLOR_ERASE);
  FBEraseGraph(fb, g, origin, (x_pixel_t) OLED_WIDTH, (y_pixel_t) OLED_HEIGHT);
  SHDestroyPoint(origin);
}

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void FBEraseFullscreenGraphData	(	framebuffer	fb,
		graph *	g
	)

Definition at line 51 of file graph_framebuffer.c.

References FB_COLOR_ERASE, FBEraseGraphData(), OLED_HEIGHT, OLED_WIDTH, shade_t, shape_create_point(), x_pixel_t, and y_pixel_t.

                                                          {
  point* origin = shape_create_point((x_pixel_t) 0, (y_pixel_t) 0, (shade_t) FB_COLOR_ERASE);
  FBEraseGraphData(fb, g, origin, (x_pixel_t) OLED_WIDTH, (y_pixel_t) OLED_HEIGHT);
  SHDestroyPoint(origin);
}

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void FBEraseGraph	(	framebuffer	fb,
		graph *	g,
		point *	top_left_corner,
		pixel_t	width,
		pixel_t	height
	)

Definition at line 103 of file graph_framebuffer.c.

References _FBDrawGraphAxesScale(), _FBDrawGraphAxesTitles(), _FBDrawGraphBounds(), _FBDrawGraphData(), _FBDrawGraphTitle(), FB_SHADE_ERASE, pixel_t, point::x, graph::x_max, graph::x_min, graph::x_pixel_end, graph::x_pixel_start, point::y, graph::y_max, graph::y_min, graph::y_pixel_end, and graph::y_pixel_start.

Referenced by FBEraseFullscreenGraph().

                                                 {
  /* Determine how many pixels to reserve for the scale numbers next
   * to the axes */
  pixel_t x_range_padding = max_pixel_width_of_long(g->y_min, g->y_max);
  pixel_t y_range_padding = max_pixel_height_of_long(g->x_min, g->x_max);

  /* {x,y}_pixel_{start,end} information in /resources/2014-04-07 10.07.01.jpg */
  g->x_pixel_start = top_left_corner->x + x_range_padding;
  g->x_pixel_end   = top_left_corner->x + width;
  g->y_pixel_start = top_left_corner->y;
  g->y_pixel_end   = top_left_corner->y + height - 2 - y_range_padding;

  _FBDrawGraphBounds(fb, g, x_range_padding, y_range_padding, top_left_corner, width, height, FB_SHADE_ERASE);
  _FBDrawGraphData(fb, g, top_left_corner, FB_SHADE_ERASE);
  _FBDrawGraphTitle(fb, g);
  _FBDrawGraphAxesTitles(fb, g);
  _FBDrawGraphAxesScale(fb, g);
}

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void FBEraseGraphData	(	framebuffer	fb,
		graph *	g,
		point *	top_left_corner,
		pixel_t	width,
		pixel_t	height
	)

Definition at line 133 of file graph_framebuffer.c.

References _FBDrawGraphData(), FB_SHADE_ERASE, pixel_t, point::x, graph::x_max, graph::x_min, graph::x_pixel_end, graph::x_pixel_start, point::y, graph::y_max, graph::y_min, graph::y_pixel_end, and graph::y_pixel_start.

Referenced by FBEraseFullscreenGraphData().

                                                     {
  /* Determine how many pixels to reserve for the scale numbers next
   * to the axes */
  pixel_t x_range_padding = max_pixel_width_of_long(g->y_min, g->y_max);
  pixel_t y_range_padding = max_pixel_height_of_long(g->x_min, g->x_max);

  /* {x,y}_pixel_{start,end} information in /resources/2014-04-07 10.07.01.jpg */
  g->x_pixel_start = top_left_corner->x + x_range_padding;
  g->x_pixel_end   = top_left_corner->x + width;
  g->y_pixel_start = top_left_corner->y;
  g->y_pixel_end   = top_left_corner->y + height - 2 - y_range_padding;

  _FBDrawGraphData(fb, g, top_left_corner, FB_SHADE_ERASE);
}

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unsigned char max_uc	(	unsigned char	one,
		unsigned char	two
	)

Definition at line 255 of file graph_framebuffer.c.

                                                           {
  if (one > two) {return one;} else return two;
}