# Variables

This is a list of useful variables and usages of them inside the source.

### General

Variable What it returns
pmap[y][x] Particle-map. (pmap[y][x]&0xFF) returns the particle type at (x,y), (pmap[y][x]>>8) returns the index of the particle at (x,y).
bmap[y][x] Block-map. Returns wall at [y][x].
emap[y][x] Electronics-map. Used for conductive walls.
r usually preset to pmap[y][x]
parts[i] the particle that has index i
pv[y/CELL][x/CELL] The pressure at x,y. Pressure is on a 4x4 grid like walls. Is a float(0.0f for 0).
vx[y/CELL][x/CELL] The air velocity in the x direction at x,y. Uses a 4x4 grid like walls. Is a float(0.0f for 0).
vy[y/CELL][x/CELL] The air velocity in the y direction at x,y. Uses a 4x4 grid like walls. Is a float(0.0f for 0).
hv[y/CELL][x/CELL] The ambient heat at x,y. It is on a 4x4 grid like walls and pressure. Is a float(0.0f for 0).
sl Selected left. Means particle selected in menu by left mouse button.
sr Selected right. Means particle selected in menu by right mouse button.
t Current particle type. ex. PT_DUST

### Particle

To get information from a particle, use parts[i].1, where i is the particle index. The index may also be stored as r>>8 instead of i. This is normally used in the update functions for particles. i is the index of the particle that is being updated, and r>>8 is the index of a particle surrounding it that it might react with or modify. To get the type of the particle from the variable r, use (r&0xFF).

### Particle Information

Variable What it returns
parts[2].type Contains the particle's current type.
parts[2].ctype Contains the particle's previous type (for example LAVA/SPRK) or the type of particle it is cloning (CLNE/...) usually.
parts[2].life Contains the particle's life.
parts[2].temp Contains the particle's temperature. It's a float(0.0f for 0K, which is -273.15C). All temps are stored in Kelvins.
parts[2].tmp Contains a value which can be used for anything. Most particles don't use it.
parts[2].tmp2 Contains another value. Even less particles use this.
parts[2].dcolour Contains the particle's decoration color, 32bit ARGB
parts[2].x Contains the particle's x coordinate. It is not an integer, it's a float. To get the exact coordinate, add .5 to it before changing it to an int.
parts[2].y Contains the particle's y coordinate. It is not an integer, it's a float. To get the exact coordinate, add .5 to it before changing it to an int.
parts[2].vx Contains the particle's x velocity. It is a float.
parts[2].vy Contains the particle's y velocity. It is a float

1 - use either type, ctype, life, temp or tmp

2 - use either r>>8 or i. See above (Particle) for more info.