physics_particle_get_data_particle(ind, buffer, flags)
| 参数 | 描述 |
|---|---|
| ind | The index (ID) of the particle to get the data from. |
| buffer | The (previously created) buffer to use to store the data. |
| flags | The flags to use to extract data about specific particle types. |
Returns: Buffer data
This function returns various pieces of information about a
single particle in the physics simulation using the given flags
checked. The particle index (its ID) is that which was returned by
the function physics_particle_create(),
and the buffer used must have been created previously using the
function buffer_create(). It
should be of the "grow" type, with the size being approximately
that of the expected return data. The flags themselves are set
using the constants given below, and you would use the bitwise
or "|" to create a single flag value to get the desired
information.
| 常量 | 描述 | Data Type |
|---|---|---|
| phy_particle_data_flag_typeflags | The flags value for the particle. | buffer_u32 |
| phy_particle_data_flag_position | The x and y position of the particle. | 2 x buffer_f32 |
| phy_particle_data_flag_velocity | The horizontal and vertical speed. | 2 x buffer_f32 |
| phy_particle_data_flag_colour | The colour and alpha value (hexadecimal). | buffer_f32 |
| phy_particle_data_flag_category | The particle category (as defined when you created the particle). | buffer_f32 |
var part = physics_particle_create(flags, x, y,
x_vel, y_vel, c_white, 1, 1)
var flags = phy_particle_data_flag_position |
phy_particle_data_flag_velocity;
var buffer = buffer_create(16, buffer_grow, 4);
physics_particle_get_data_particle(part, buffer, flags);
px = buffer_read(buffer, buffer_f32);
py = buffer_read(buffer, buffer_f32);
pvelx = buffer_read(buffer, buffer_f32);
pvely = buffer_read(buffer, buffer_f32);
buffer_delete(buffer);
The above code gets the position and velocity of the particle indexed by the variable "part" and stores the data in a number of variables.