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  1. shell = instance_create(shell_x,
  2.                         shell_y,
  3.                         shell_object);
  4.  
  5. with (shell) {
  6.    
  7.     // assign bullet owner to ensure it doesn't hit self
  8.     owner = other.owner;
  9.    
  10.     // give bullet its direction
  11.     image_angle = other.image_angle;
  12.     direction = image_angle;
  13.  
  14.     // for calculating travel distances, get origin and target x, y, z locations
  15.     origin_y = y;
  16.     origin_x = x;
  17.     origin_z = other.z;
  18.    
  19.     target_x = other.desired_point[0];
  20.     target_y = other.desired_point[1];
  21.     target_z = other.desired_point[2];
  22.    
  23.     // set target distance
  24.     target_distance = point_distance(x, y, other.desired_point[0], other.desired_point[1]);
  25.    
  26.     // make sure distance isn't greater than maximum
  27.     if (target_distance > other.maximum_range) target_distance = other.maximum_range;  
  28.    
  29.     show_debug_message("Target distance: " + string(target_distance)); 
  30.  
  31.     // shells total velocity in all axises
  32.     shell_velocity = other.shell_velocity;
  33.    
  34.     // use for testing purposes, delete when formulas work
  35.     target_z = 40;
  36.    
  37.     // convert velocity from pixels per tick to pixels per second
  38.     var v = shell_velocity * room_speed; // convert speed per tick to speed per second
  39.    
  40.     // v to the power of 2
  41.     var v_2 = power(v, 2);
  42.    
  43.     // v to the power of 4
  44.     var v_4 = power(v, 4);
  45.    
  46.     // gravity
  47.     var g = 9.8 * 10;
  48.    
  49.     // displacement to target in vertical and horizontal
  50.     var dis_h = target_distance;
  51.     var dis_z = (target_z - origin_z);
  52.     var dis_h_2 = power(dis_h, 2);
  53.        
  54.     // calculate potential angles, one will be high, one will be low
  55.     var theta_0 = radtodeg(arctan(  (v_2 - sqrt(v_4 - g * ( g * dis_h_2 + 2 * dis_z * v_2)) ) / (g * dis_h)   ));
  56.     var theta_1 = radtodeg(arctan(  (v_2 + sqrt(v_4 - g * ( g * dis_h_2 + 2 * dis_z * v_2)) ) / (g * dis_h)   ));
  57.        
  58.     // set to angle closest to 0
  59.     if (abs(theta_1) < abs(theta_0)) theta = theta_1;
  60.     else theta = theta_0;
  61.    
  62.     show_debug_message("Theta is: " + string(theta) + " based on a theta_0 of: " + string(theta_0) +
  63.         " and theta_1 of: " + string(theta_1));
  64.    
  65.     // horizontal velocity, x and y axis
  66.     velocity_h = shell_velocity * radtodeg(cos(degtorad(theta)));
  67.    
  68.     // vertical velocity, z axis
  69.     velocity_v = shell_velocity * radtodeg(sin(degtorad(theta)));
  70. }
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