bresenham-line.c

bresenham-line clib

Installation

Install with clib:

$ clib install jb55/bresenham-line.c

Example

// drawing pixels
int draw_pixel(void *data, int x, int y) {
  struct draw_mode *dm = (struct draw_mode*)data;
  struct world *world = dm->world;
  draw_pixel_at(world, x, y, dm->type);
  return 0;
}

bresenham_line((void*)&draw_data, x0, y0, x1, y1, draw_pixel);

// collision detection
bresenham_line((void*)&cdata, x0, y0, x1, y1, collide_pixel);

API

void bresenham_line(void *data, int x0, int y0, int x1, int y1, int (*setPixel)(void *, int, int));

arguments

• data a void pointer to data that's passed to setPixel

• x0 the starting x pixel

• y0 the starting y pixel

• x1 the ending x pixel

• y1 the ending y pixel

• setPixel a function pointer that takes:

  • data a void pointer to data, originally passed in on the original call
  • int the x pixel that's set
  • int the y pixel that's set

  if setPixel returns BH_STOP_LINE, it will stop the line drawing process. Otherwise, it will continue.