physics_particle_group_box(halfWidth, halfHeight)
| Argument | Description |
|---|---|
| halfWidth | The half width of the box. |
| halfHeight | The half height of the box. |
Returns: N/A
This function will set the shape of the particle group that is being created. You must first have begun the group definition using the function
physics_particle_group_begin(), and then you would use this function to set the approximate half width and half height of the group in pixels - approximate because the exact width and height will
depend on the size of the base particles, as defined by the physics_particle_set_radius() function, as the physics simulation tries to "fit" as many of the
particles as possible into the defined shape. Finally you need to call physics_particle_group_end() to create the group of particles in the room.
var flags = phy_particle_flag_water | phy_particle_flag_viscous | phy_particle_flag_tensile;
var groupflags = phy_particle_group_flag_solid;
physics_particle_group_begin(flags, groupflags, mouse_x, mouse_y, 0, 0, 0, 0, c_white, 1, 1, 2);
physics_particle_group_box(100, 100);
mLastGroup = physics_particle_group_end();
The above code stores the flags for the particle type and the particle group properties in variables then uses these to create a rectangular particle group with with sides of 200px at the mouse position.