libg15render
pixel.c File Reference
#include <fcntl.h>
#include "libg15render.h"

Go to the source code of this file.

Functions

void g15r_drawBar (g15canvas *canvas, int x1, int y1, int x2, int y2, int color, int num, int max, int type)
 Draws a completion bar. More...
 
void g15r_drawBigNum (g15canvas *canvas, unsigned int x1, unsigned int y1, unsigned int x2, unsigned int y2, int color, int num)
 Draw a large number. More...
 
void g15r_drawCircle (g15canvas *canvas, int x, int y, int r, int fill, int color)
 Draws a circle centered at (x, y) with a radius of r. More...
 
void g15r_drawIcon (g15canvas *canvas, char *buf, int my_x, int my_y, int width, int height)
 Draw an icon to the screen from a wbmp buffer. More...
 
void g15r_drawLine (g15canvas *canvas, int px1, int py1, int px2, int py2, const int color)
 Draws a line from (px1, py1) to (px2, py2) More...
 
void g15r_drawRoundBox (g15canvas *canvas, int x1, int y1, int x2, int y2, int fill, int color)
 Draws a box with rounded corners bounded by (x1, y1) and (x2, y2) More...
 
void g15r_drawSprite (g15canvas *canvas, char *buf, int my_x, int my_y, int width, int height, int start_x, int start_y, int total_width)
 Draw a sprite to the screen from a wbmp buffer. More...
 
int g15r_loadWbmpSplash (g15canvas *canvas, char *filename)
 Draw a splash screen from 160x43 wbmp file. More...
 
char * g15r_loadWbmpToBuf (char *filename, int *img_width, int *img_height)
 Load a wbmp file into a buffer. More...
 
void g15r_pixelBox (g15canvas *canvas, int x1, int y1, int x2, int y2, int color, int thick, int fill)
 Draws a box bounded by (x1, y1) and (x2, y2) More...
 
void g15r_pixelOverlay (g15canvas *canvas, int x1, int y1, int width, int height, short colormap[])
 Overlays a bitmap of size width x height starting at (x1, y1) More...
 
void g15r_pixelReverseFill (g15canvas *canvas, int x1, int y1, int x2, int y2, int fill, int color)
 Fills an area bounded by (x1, y1) and (x2, y2) More...
 
void swap (int *x, int *y)
 

Function Documentation

void g15r_drawBar ( g15canvas canvas,
int  x1,
int  y1,
int  x2,
int  y2,
int  color,
int  num,
int  max,
int  type 
)

Draws a completion bar.

Given a maximum value, and a value between 0 and that maximum value, calculate and draw a bar showing that percentage.

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
x1Defines leftmost bound of the bar.
y1Defines uppermost bound of the bar.
x2Defines rightmost bound of the bar.
y2Defines bottommost bound of the bar.
colorThe bar will be drawn this color.
numNumber of units relative to max filled.
maxNumber of units equal to 100% filled.
typeType of bar. 1=solid bar, 2=solid bar with border, 3 = solid bar with I-frame.

Definition at line 337 of file pixel.c.

References g15r_drawLine(), and g15r_pixelBox().

339 {
340  float len, length;
341  int x;
342  if (max == 0)
343  return;
344  if (num > max)
345  num = max;
346 
347  if (type == 2)
348  {
349  y1 += 2;
350  y2 -= 2;
351  x1 += 2;
352  x2 -= 2;
353  }
354 
355  len = ((float) max / (float) num);
356  length = (x2 - x1) / len;
357 
358  if (type == 1)
359  {
360  g15r_pixelBox (canvas, x1, y1 - type, x2, y2 + type, color ^ 1, 1, 1);
361  g15r_pixelBox (canvas, x1, y1 - type, x2, y2 + type, color, 1, 0);
362  }
363  else if (type == 2)
364  {
365  g15r_pixelBox (canvas, x1 - 2, y1 - type, x2 + 2, y2 + type, color ^ 1,
366  1, 1);
367  g15r_pixelBox (canvas, x1 - 2, y1 - type, x2 + 2, y2 + type, color, 1,
368  0);
369  }
370  else if (type == 3)
371  {
372  g15r_drawLine (canvas, x1, y1 - type, x1, y2 + type, color);
373  g15r_drawLine (canvas, x2, y1 - type, x2, y2 + type, color);
374  g15r_drawLine (canvas, x1, y1 + ((y2 - y1) / 2), x2,
375  y1 + ((y2 - y1) / 2), color);
376  }
377  g15r_pixelBox (canvas, x1, y1, (int) ceil (x1 + length), y2, color, 1, 1);
378 }
void g15r_pixelBox(g15canvas *canvas, int x1, int y1, int x2, int y2, int color, int thick, int fill)
Draws a box bounded by (x1, y1) and (x2, y2)
Definition: pixel.c:163
void g15r_drawLine(g15canvas *canvas, int px1, int py1, int px2, int py2, const int color)
Draws a line from (px1, py1) to (px2, py2)
Definition: pixel.c:99
void g15r_drawBigNum ( g15canvas canvas,
unsigned int  x1,
unsigned int  y1,
unsigned int  x2,
unsigned int  y2,
int  color,
int  num 
)

Draw a large number.

Draw a large number to a canvas

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
x1Defines leftmost bound of the number.
y1Defines uppermost bound of the number.
x2Defines rightmost bound of the number.
y2Defines bottommost bound of the number.
numThe number to be drawn.

Definition at line 545 of file pixel.c.

References g15r_pixelBox().

546 {
547  x1 += 2;
548  x2 -= 2;
549 
550  switch(num){
551  case 0:
552  g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
553  g15r_pixelBox (canvas, x1 +5, y1 +5, x2 -5, y2 - 6, 1 - color, 1, 1);
554  break;
555  case 1:
556  g15r_pixelBox (canvas, x2-5, y1, x2, y2 , color, 1, 1);
557  g15r_pixelBox (canvas, x1, y1, x2 -5, y2, 1 - color, 1, 1);
558  break;
559  case 2:
560  g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
561  g15r_pixelBox (canvas, x1, y1+5, x2 -5, y1+((y2/2)-3), 1 - color, 1, 1);
562  g15r_pixelBox (canvas, x1+5, y1+((y2/2)+3), x2 , y2-6, 1 - color, 1, 1);
563  break;
564  case 3:
565  g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
566  g15r_pixelBox (canvas, x1, y1+5, x2 -5, y1+((y2/2)-3), 1 - color, 1, 1);
567  g15r_pixelBox (canvas, x1, y1+((y2/2)+3), x2-5 , y2-6, 1 - color, 1, 1);
568  break;
569  case 4:
570  g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
571  g15r_pixelBox (canvas, x1, y1+((y2/2)+3), x2 -5, y2, 1 - color, 1, 1);
572  g15r_pixelBox (canvas, x1+5, y1, x2-5 , y1+((y2/2)-3), 1 - color, 1, 1);
573  break;
574  case 5:
575  g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
576  g15r_pixelBox (canvas, x1+5, y1+5, x2 , y1+((y2/2)-3), 1 - color, 1, 1);
577  g15r_pixelBox (canvas, x1, y1+((y2/2)+3), x2-5 , y2-6, 1 - color, 1, 1);
578  break;
579  case 6:
580  g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
581  g15r_pixelBox (canvas, x1+5, y1+5, x2 , y1+((y2/2)-3), 1 - color, 1, 1);
582  g15r_pixelBox (canvas, x1+5, y1+((y2/2)+3), x2-5 , y2-6, 1 - color, 1, 1);
583  break;
584  case 7:
585  g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
586  g15r_pixelBox (canvas, x1, y1+5, x2 -5, y2, 1 - color, 1, 1);
587  break;
588  case 8:
589  g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
590  g15r_pixelBox (canvas, x1+5, y1+5, x2-5 , y1+((y2/2)-3), 1 - color, 1, 1);
591  g15r_pixelBox (canvas, x1+5, y1+((y2/2)+3), x2-5 , y2-6, 1 - color, 1, 1);
592  break;
593  case 9:
594  g15r_pixelBox (canvas, x1, y1, x2, y2 , color, 1, 1);
595  g15r_pixelBox (canvas, x1+5, y1+5, x2-5 , y1+((y2/2)-3), 1 - color, 1, 1);
596  g15r_pixelBox (canvas, x1, y1+((y2/2)+3), x2-5 , y2, 1 - color, 1, 1);
597  break;
598  case 10:
599  g15r_pixelBox (canvas, x2-5, y1+5, x2, y1+10 , color, 1, 1);
600  g15r_pixelBox (canvas, x2-5, y2-10, x2, y2-5 , color, 1, 1);
601  break;
602  case 11:
603  g15r_pixelBox (canvas, x1, y1+((y2/2)-2), x2, y1+((y2/2)+2), color, 1, 1);
604  break;
605  case 12:
606  g15r_pixelBox (canvas, x2-5, y2-5, x2, y2 , color, 1, 1);
607  break;
608  }
609 }
void g15r_pixelBox(g15canvas *canvas, int x1, int y1, int x2, int y2, int color, int thick, int fill)
Draws a box bounded by (x1, y1) and (x2, y2)
Definition: pixel.c:163
void g15r_drawCircle ( g15canvas canvas,
int  x,
int  y,
int  r,
int  fill,
int  color 
)

Draws a circle centered at (x, y) with a radius of r.

Draws a circle centered at (x, y) with a radius of r.

The circle will be filled if fill != 0.

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
xDefines horizontal center of the circle.
yDefines vertical center of circle.
rDefines radius of circle.
fillThe circle will be filled with color if fill != 0.
colorLines defining the circle will be drawn this color.

Definition at line 203 of file pixel.c.

References g15r_drawLine(), and g15r_setPixel().

204 {
205  int xx, yy, dd;
206 
207  xx = 0;
208  yy = r;
209  dd = 2 * (1 - r);
210 
211  while (yy >= 0)
212  {
213  if (!fill)
214  {
215  g15r_setPixel (canvas, x + xx, y - yy, color);
216  g15r_setPixel (canvas, x + xx, y + yy, color);
217  g15r_setPixel (canvas, x - xx, y - yy, color);
218  g15r_setPixel (canvas, x - xx, y + yy, color);
219  }
220  else
221  {
222  g15r_drawLine (canvas, x - xx, y - yy, x + xx, y - yy, color);
223  g15r_drawLine (canvas, x - xx, y + yy, x + xx, y + yy, color);
224  }
225  if (dd + yy > 0)
226  {
227  yy--;
228  dd = dd - (2 * yy + 1);
229  }
230  if (xx > dd)
231  {
232  xx++;
233  dd = dd + (2 * xx + 1);
234  }
235  }
236 }
void g15r_setPixel(g15canvas *canvas, unsigned int x, unsigned int y, int val)
Sets the value of the pixel at (x, y)
Definition: screen.c:50
void g15r_drawLine(g15canvas *canvas, int px1, int py1, int px2, int py2, const int color)
Draws a line from (px1, py1) to (px2, py2)
Definition: pixel.c:99
void g15r_drawIcon ( g15canvas canvas,
char *  buf,
int  my_x,
int  my_y,
int  width,
int  height 
)

Draw an icon to the screen from a wbmp buffer.

Draw an icon to a canvas

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated in is found.
bufA pointer to the buffer holding the icon to be displayed.
my_xLeftmost boundary of image.
my_yTopmost boundary of image.
widthWidth of the image in buf.
heightHeight of the image in buf.

Definition at line 411 of file pixel.c.

References BYTE_SIZE, and g15r_setPixel().

412 {
413  int y,x,val;
414  unsigned int pixel_offset = 0;
415  unsigned int byte_offset, bit_offset;
416 
417  for (y=0; y < height - 1; y++)
418  for (x=0; x < width - 1; x++)
419  {
420  pixel_offset = y * width + x;
421  byte_offset = pixel_offset / BYTE_SIZE;
422  bit_offset = 7 - (pixel_offset % BYTE_SIZE);
423 
424  val = (buf[byte_offset] & (1 << bit_offset)) >> bit_offset;
425  g15r_setPixel (canvas, x + my_x, y + my_y, val);
426  }
427 }
#define BYTE_SIZE
Definition: libg15render.h:21
void g15r_setPixel(g15canvas *canvas, unsigned int x, unsigned int y, int val)
Sets the value of the pixel at (x, y)
Definition: screen.c:50
void g15r_drawLine ( g15canvas canvas,
int  px1,
int  py1,
int  px2,
int  py2,
const int  color 
)

Draws a line from (px1, py1) to (px2, py2)

A line of color is drawn from (px1, py1) to (px2, py2).

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
px1X component of point 1.
py1Y component of point 1.
px2X component of point 2.
py2Y component of point 2.
colorLine will be drawn this color.

Definition at line 99 of file pixel.c.

References g15r_setPixel(), and swap().

Referenced by g15r_drawBar(), g15r_drawCircle(), g15r_drawRoundBox(), and g15r_pixelBox().

101 {
102  /*
103  * Bresenham's Line Algorithm
104  * http://en.wikipedia.org/wiki/Bresenham's_algorithm
105  */
106 
107  int steep = 0;
108 
109  if (abs (py2 - py1) > abs (px2 - px1))
110  steep = 1;
111 
112  if (steep)
113  {
114  swap (&px1, &py1);
115  swap (&px2, &py2);
116  }
117 
118  if (px1 > px2)
119  {
120  swap (&px1, &px2);
121  swap (&py1, &py2);
122  }
123 
124  int dx = px2 - px1;
125  int dy = abs (py2 - py1);
126 
127  int error = 0;
128  int y = py1;
129  int ystep = (py1 < py2) ? 1 : -1;
130  int x = 0;
131 
132  for (x = px1; x <= px2; ++x)
133  {
134  if (steep)
135  g15r_setPixel (canvas, y, x, color);
136  else
137  g15r_setPixel (canvas, x, y, color);
138 
139  error += dy;
140  if (2 * error >= dx)
141  {
142  y += ystep;
143  error -= dx;
144  }
145  }
146 }
void swap(int *x, int *y)
Definition: pixel.c:23
void g15r_setPixel(g15canvas *canvas, unsigned int x, unsigned int y, int val)
Sets the value of the pixel at (x, y)
Definition: screen.c:50
void g15r_drawRoundBox ( g15canvas canvas,
int  x1,
int  y1,
int  x2,
int  y2,
int  fill,
int  color 
)

Draws a box with rounded corners bounded by (x1, y1) and (x2, y2)

Draws a rounded box around the area bounded by (x1, y1) and (x2, y2).

The box will be filled if fill != 0.

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
x1Defines leftmost bound of the box.
y1Defines uppermost bound of the box.
x2Defines rightmost bound of the box.
y2Defines bottommost bound of the box.
fillThe box will be filled with color if fill != 0.
colorLines defining the box will be drawn this color.

Definition at line 252 of file pixel.c.

References G15_COLOR_BLACK, G15_COLOR_WHITE, g15r_drawLine(), and g15r_setPixel().

254 {
255  int y, shave = 3;
256 
257  if (shave > (x2 - x1) / 2)
258  shave = (x2 - x1) / 2;
259  if (shave > (y2 - y1) / 2)
260  shave = (y2 - y1) / 2;
261 
262  if ((x1 != x2) && (y1 != y2))
263  {
264  if (fill)
265  {
266  g15r_drawLine (canvas, x1 + shave, y1, x2 - shave, y1, color);
267  for (y = y1 + 1; y < y1 + shave; y++)
268  g15r_drawLine (canvas, x1 + 1, y, x2 - 1, y, color);
269  for (y = y1 + shave; y <= y2 - shave; y++)
270  g15r_drawLine (canvas, x1, y, x2, y, color);
271  for (y = y2 - shave + 1; y < y2; y++)
272  g15r_drawLine (canvas, x1 + 1, y, x2 - 1, y, color);
273  g15r_drawLine (canvas, x1 + shave, y2, x2 - shave, y2, color);
274  if (shave == 4)
275  {
276  g15r_setPixel (canvas, x1 + 1, y1 + 1,
277  color ==
280  g15r_setPixel (canvas, x1 + 1, y2 - 1,
281  color ==
284  g15r_setPixel (canvas, x2 - 1, y1 + 1,
285  color ==
288  g15r_setPixel (canvas, x2 - 1, y2 - 1,
289  color ==
292  }
293  }
294  else
295  {
296  g15r_drawLine (canvas, x1 + shave, y1, x2 - shave, y1, color);
297  g15r_drawLine (canvas, x1, y1 + shave, x1, y2 - shave, color);
298  g15r_drawLine (canvas, x2, y1 + shave, x2, y2 - shave, color);
299  g15r_drawLine (canvas, x1 + shave, y2, x2 - shave, y2, color);
300  if (shave > 1)
301  {
302  g15r_drawLine (canvas, x1 + 1, y1 + 1, x1 + shave - 1, y1 + 1,
303  color);
304  g15r_drawLine (canvas, x2 - shave + 1, y1 + 1, x2 - 1, y1 + 1,
305  color);
306  g15r_drawLine (canvas, x1 + 1, y2 - 1, x1 + shave - 1, y2 - 1,
307  color);
308  g15r_drawLine (canvas, x2 - shave + 1, y2 - 1, x2 - 1, y2 - 1,
309  color);
310  g15r_drawLine (canvas, x1 + 1, y1 + 1, x1 + 1, y1 + shave - 1,
311  color);
312  g15r_drawLine (canvas, x1 + 1, y2 - 1, x1 + 1, y2 - shave + 1,
313  color);
314  g15r_drawLine (canvas, x2 - 1, y1 + 1, x2 - 1, y1 + shave - 1,
315  color);
316  g15r_drawLine (canvas, x2 - 1, y2 - 1, x2 - 1, y2 - shave + 1,
317  color);
318  }
319  }
320  }
321 }
#define G15_COLOR_BLACK
Definition: libg15render.h:27
#define G15_COLOR_WHITE
Definition: libg15render.h:26
void g15r_setPixel(g15canvas *canvas, unsigned int x, unsigned int y, int val)
Sets the value of the pixel at (x, y)
Definition: screen.c:50
void g15r_drawLine(g15canvas *canvas, int px1, int py1, int px2, int py2, const int color)
Draws a line from (px1, py1) to (px2, py2)
Definition: pixel.c:99
void g15r_drawSprite ( g15canvas canvas,
char *  buf,
int  my_x,
int  my_y,
int  width,
int  height,
int  start_x,
int  start_y,
int  total_width 
)

Draw a sprite to the screen from a wbmp buffer.

Draw a sprite to a canvas

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated in is found.
bufA pointer to the buffer holding a set of sprites.
my_xLeftmost boundary of image.
my_yTopmost boundary of image.
widthWidth of the sprite.
heightHeight of the sprite.
start_xX offset for reading sprite from buf.
start_yY offset for reading sprite from buf.
total_widthWidth of the set of sprites held in buf.

Definition at line 443 of file pixel.c.

References BYTE_SIZE, and g15r_setPixel().

444 {
445  int y,x,val;
446  unsigned int pixel_offset = 0;
447  unsigned int byte_offset, bit_offset;
448 
449  for (y=0; y < height - 1; y++)
450  for (x=0; x < width - 1; x++)
451  {
452  pixel_offset = (y + start_y) * total_width + (x + start_x);
453  byte_offset = pixel_offset / BYTE_SIZE;
454  bit_offset = 7 - (pixel_offset % BYTE_SIZE);
455 
456  val = (buf[byte_offset] & (1 << bit_offset)) >> bit_offset;
457  g15r_setPixel (canvas, x + my_x, y + my_y, val);
458  }
459 }
#define BYTE_SIZE
Definition: libg15render.h:21
void g15r_setPixel(g15canvas *canvas, unsigned int x, unsigned int y, int val)
Sets the value of the pixel at (x, y)
Definition: screen.c:50
int g15r_loadWbmpSplash ( g15canvas canvas,
char *  filename 
)

Draw a splash screen from 160x43 wbmp file.

wbmp splash screen loader - assumes image is 160x43

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
filenameA string holding the path to the wbmp to be displayed.

Definition at line 387 of file pixel.c.

References g15canvas::buffer, G15_BUFFER_LEN, and g15r_loadWbmpToBuf().

388 {
389  int width=0, height=0;
390  char *buf;
391 
392  buf = g15r_loadWbmpToBuf(filename,
393  &width,
394  &height);
395 
396  memcpy (canvas->buffer, buf, G15_BUFFER_LEN);
397  return 0;
398 }
unsigned char buffer[G15_BUFFER_LEN]
Definition: libg15render.h:39
char * g15r_loadWbmpToBuf(char *filename, int *img_width, int *img_height)
Load a wbmp file into a buffer.
Definition: pixel.c:469
#define G15_BUFFER_LEN
Definition: libg15render.h:22
char* g15r_loadWbmpToBuf ( char *  filename,
int *  img_width,
int *  img_height 
)

Load a wbmp file into a buffer.

basic wbmp loader - loads a wbmp image into a buffer.

Parameters
filenameA string holding the path to the wbmp to be loaded.
img_widthA pointer to an int that will hold the image width on return.
img_heightA pointer to an int that will hold the image height on return.

Definition at line 469 of file pixel.c.

References BYTE_SIZE.

Referenced by g15r_loadWbmpSplash().

470 {
471  int wbmp_fd;
472  int retval;
473  int x,y,val;
474  char *buf;
475  unsigned int buflen,header=4;
476  unsigned char headerbytes[5];
477  unsigned int pixel_offset = 0;
478  unsigned int byte_offset, bit_offset;
479 
480  wbmp_fd=open(filename,O_RDONLY);
481  if(!wbmp_fd){
482  return NULL;
483  }
484 
485  retval=read(wbmp_fd,headerbytes,5);
486 
487  if(retval){
488  if (headerbytes[2] & 1) {
489  *img_width = ((unsigned char)headerbytes[2] ^ 1) | (unsigned char)headerbytes[3];
490  *img_height = headerbytes[4];
491  header = 5;
492  } else {
493  *img_width = headerbytes[2];
494  *img_height = headerbytes[3];
495  }
496 
497  int byte_width = *img_width / 8;
498  if (*img_width %8)
499  byte_width++;
500 
501  buflen = byte_width * (*img_height);
502 
503  buf = (char *)malloc (buflen);
504  if (buf == NULL)
505  return NULL;
506 
507  if (header == 4)
508  buf[0]=headerbytes[4];
509 
510  retval=read(wbmp_fd,buf+(5-header),buflen);
511 
512  close(wbmp_fd);
513  }
514 
515  /* now invert the image */
516  for (y = 0; y < *img_height; y++)
517  for (x = 0; x < *img_width; x++)
518  {
519  pixel_offset = y * (*img_width) + x;
520  byte_offset = pixel_offset / BYTE_SIZE;
521  bit_offset = 7 - (pixel_offset % BYTE_SIZE);
522 
523  val = (buf[byte_offset] & (1 << bit_offset)) >> bit_offset;
524 
525  if (!val)
526  buf[byte_offset] = buf[byte_offset] | 1 << bit_offset;
527  else
528  buf[byte_offset] = buf[byte_offset] & ~(1 << bit_offset);
529  }
530 
531  return buf;
532 }
#define BYTE_SIZE
Definition: libg15render.h:21
void g15r_pixelBox ( g15canvas canvas,
int  x1,
int  y1,
int  x2,
int  y2,
int  color,
int  thick,
int  fill 
)

Draws a box bounded by (x1, y1) and (x2, y2)

Draws a box around the area bounded by (x1, y1) and (x2, y2).

The box will be filled if fill != 0 and the sides will be thick pixels wide.

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
x1Defines leftmost bound of the box.
y1Defines uppermost bound of the box.
x2Defines rightmost bound of the box.
y2Defines bottommost bound of the box.
colorLines defining the box will be drawn this color.
thickLines defining the box will be this many pixels thick.
fillThe box will be filled with color if fill != 0.

Definition at line 163 of file pixel.c.

References g15r_drawLine(), and g15r_setPixel().

Referenced by g15r_drawBar(), and g15r_drawBigNum().

165 {
166  int i = 0;
167  for (i = 0; i < thick; ++i)
168  {
169  g15r_drawLine (canvas, x1, y1, x2, y1, color); /* Top */
170  g15r_drawLine (canvas, x1, y1, x1, y2, color); /* Left */
171  g15r_drawLine (canvas, x2, y1, x2, y2, color); /* Right */
172  g15r_drawLine (canvas, x1, y2, x2, y2, color); /* Bottom */
173  x1++;
174  y1++;
175  x2--;
176  y2--;
177  }
178 
179  int x = 0, y = 0;
180 
181  if (fill)
182  {
183  for (x = x1; x <= x2; ++x)
184  for (y = y1; y <= y2; ++y)
185  g15r_setPixel (canvas, x, y, color);
186  }
187 
188 }
void g15r_setPixel(g15canvas *canvas, unsigned int x, unsigned int y, int val)
Sets the value of the pixel at (x, y)
Definition: screen.c:50
void g15r_drawLine(g15canvas *canvas, int px1, int py1, int px2, int py2, const int color)
Draws a line from (px1, py1) to (px2, py2)
Definition: pixel.c:99
void g15r_pixelOverlay ( g15canvas canvas,
int  x1,
int  y1,
int  width,
int  height,
short  colormap[] 
)

Overlays a bitmap of size width x height starting at (x1, y1)

A 1-bit bitmap defined in colormap[] is drawn to the canvas with an upper left corner at (x1, y1) and a lower right corner at (x1+width, y1+height).

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
x1Defines the leftmost bound of the area to be drawn.
y1Defines the uppermost bound of the area to be drawn.
widthDefines the width of the bitmap to be drawn.
heightDefines the height of the bitmap to be drawn.
colormapAn array containing width*height entries of value 0 for pixel off or != 0 for pixel on.

Definition at line 74 of file pixel.c.

References G15_COLOR_BLACK, G15_COLOR_WHITE, and g15r_setPixel().

76 {
77  int i = 0;
78 
79  for (i = 0; i < (width * height); ++i)
80  {
81  int color = (colormap[i] ? G15_COLOR_BLACK : G15_COLOR_WHITE);
82  int x = x1 + i % width;
83  int y = y1 + i / width;
84  g15r_setPixel (canvas, x, y, color);
85  }
86 }
#define G15_COLOR_BLACK
Definition: libg15render.h:27
#define G15_COLOR_WHITE
Definition: libg15render.h:26
void g15r_setPixel(g15canvas *canvas, unsigned int x, unsigned int y, int val)
Sets the value of the pixel at (x, y)
Definition: screen.c:50
void g15r_pixelReverseFill ( g15canvas canvas,
int  x1,
int  y1,
int  x2,
int  y2,
int  fill,
int  color 
)

Fills an area bounded by (x1, y1) and (x2, y2)

The area with an upper left corner at (x1, y1) and lower right corner at (x2, y2) will be filled with color if fill>0 or the current contents of the area will be reversed if fill==0.

Parameters
canvasA pointer to a g15canvas struct in which the buffer to be operated on is found.
x1Defines leftmost bound of area to be filled.
y1Defines uppermost bound of area to be filled.
x2Defines rightmost bound of area to be filled.
y2Defines bottommost bound of area to be filled.
fillArea will be filled with color if fill != 0, else contents of area will have color values reversed.
colorIf fill != 0, then area will be filled if color == 1 and emptied if color == 0.

Definition at line 45 of file pixel.c.

References g15r_getPixel(), and g15r_setPixel().

47 {
48  int x = 0;
49  int y = 0;
50 
51  for (x = x1; x <= x2; ++x)
52  {
53  for (y = y1; y <= y2; ++y)
54  {
55  if (!fill)
56  color = !g15r_getPixel (canvas, x, y);
57  g15r_setPixel (canvas, x, y, color);
58  }
59  }
60 }
int g15r_getPixel(g15canvas *canvas, unsigned int x, unsigned int y)
Gets the value of the pixel at (x, y)
Definition: screen.c:29
void g15r_setPixel(g15canvas *canvas, unsigned int x, unsigned int y, int val)
Sets the value of the pixel at (x, y)
Definition: screen.c:50
void swap ( int *  x,
int *  y 
)

Definition at line 23 of file pixel.c.

Referenced by g15r_drawLine().

24 {
25  int tmp;
26 
27  tmp = *x;
28  *x = *y;
29  *y = tmp;
30 }