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  1. /// @param _x1
  2. /// @param _y1
  3. /// @param _x2
  4. /// @param _y2
  5. /// @param grid
  6. /// @param dist = 0;
  7. /// return true/false
  8.  
  9. var _x1 = argument[0], _y1 = argument[1], _x2 = argument[2], _y2 = argument[3], grid = argument[4];
  10. var dist = argument_count > 5 ? argument[5] : 0;;
  11.  
  12. if (dist and dist < point_distance(_x1, _y1, _x2, _y2)) {
  13.     var dir = point_direction(_x1, _y1, _x2, _y2);
  14.     _x2 = _x1 + lengthdir_x(dist, dir);
  15.     _y2 = _y1 + lengthdir_y(dist, dir);
  16. }
  17.  
  18. var x1 = _x1 div GRID_CELL_WIDTH; // iso_from_normal_x(_x1, _y1);
  19. var y1 = _y1 div GRID_CELL_HEIGHT; // iso_from_normal_y(_x1, _y1);
  20. var x2 = _x2 div GRID_CELL_WIDTH; // iso_from_normal_x(_x2, _y2);
  21. var y2 = _y2 div GRID_CELL_HEIGHT; // iso_from_normal_y(_x2, _y2);
  22.  
  23. // if (floor(x1) == floor(x2) or floor(y1) == floor(y2) or abs(floor(x1) - floor(x2)) == abs(floor(y1) - floor(y2))) {
  24. //     return collision_line_grid_2(floor(x1), floor(y1), floor(x2), floor(y2), grid);
  25. // }
  26.  
  27. if (grid[# floor(x1), floor(y1)] < 0) {
  28.     return true;
  29. }
  30.  
  31.  
  32. if (grid[# floor(x2), floor(y2)] < 0) {
  33.     return true;
  34. }
  35.  
  36. var k = (y2 - y1) / (x2 - x1);
  37. var b = y1 - k * x1;
  38.  
  39. var xs = min(x1, x2);
  40. var xe = max(x1, x2);
  41. for (var xx = ceil(xs); xx <= floor(xe); xx++) {
  42.     if (grid[# floor(xx) - (y2 < y1), floor(k * xx + b)] < 0) {
  43.         return true;
  44.     }
  45. }
  46.  
  47. var ys = min(y1, y2);
  48. var ye = max(y1, y2);
  49. for (var yy = ceil(ys); yy <= floor(ye); yy++) {
  50.     if (grid[# floor((yy - b) / k), floor(yy) - (x2 < x1)] < 0) {
  51.         return true;
  52.     }
  53. }
  54.  
  55. return false;
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