text stringlengths 0 721 |
|---|
``` |
Output: |
``` |
Krisu the Bass, lvl 99 |
Row 1: [.X] |
Pi is roughly 3.14 |
``` |
--- |
## Math Functions |
| Function | Description | |
|----------|-------------| |
| `ABS(n)` | Absolute value | |
| `ATAN(n)` | Arc tangent | |
| `ATAN2(n, n2)` | Returns the angle, in radians, between the positive x-axis and a vector to the point with the given (x, y) coordinates in the Cartesian plane | |
| `BETWEEN(n, min, max)` | TRUE if min ≤ n ≤ max | |
| `INBETWEEN(n, min, max)` | TRUE if min < n < max (strictly between, not equal) | |
| `CEIL(n)` / `FLOOR(n)` | Round up / down | |
| `CINT(n)` | Round to nearest integer | |
| `CLAMP(n, min, max)` | Constrain n to [min, max] | |
| `COS(n)` / `SIN(n)` / `TAN(n)` | Trig (radians) | |
| `DEG(rad)` / `RAD(deg)` | Radians ↔ degrees | |
| `DISTANCE(x1,y1, x2,y2)` | 2D Euclidean distance | |
| `DISTANCE(x1,y1,z1, x2,y2,z2)` | 3D Euclidean distance | |
| `EXP(n)` | e^n | |
| `INT(n)` | Truncate toward zero | |
| `LERP(start, end, t)` | Linear interpolation (t: 0.0–1.0) | |
| `LOG(n)` | Natural logarithm | |
| `MAX(a, b)` / `MIN(a, b)` | Larger / smaller of two | |
| `MOD(a, b)` | Remainder | |
| `POW(base, exp)` | Power | |
| `RND(n)` | Random integer 0 to n-1 if n > 0 | |
| `RND(0)` | Float between 0.0 and 1.0 (IE: 0.5841907423666761) | |
| `ROUND(n)` | Standard rounding | |
| `SGN(n)` | Sign: -1, 0, or 1 | |
| `SQR(n)` | Square root | |
**Math constants:** `PI#`, `HPI#` (PI/2), `QPI#` (PI/4), `TAU#` (PI*2), `EULER#` |
--- |
## Variable Functions |
| Function | Description | |
|----------|-------------| |
| `ISSET(name)` | `1` if the named variable (`$`) or constant (`#`) is declared, `0` otherwise. Argument is **not evaluated** — `ISSET(undef$)` safely returns `0`. | |
`ISSET` is the only language-introspection function and it has tight rules: |
- **Scalars only.** Variables (`$`) and constants (`#`). Arrays and array elements are stored separately — `ISSET(arr$)` and `ISSET(arr$(0))` always return `0`, never an error. |
- **Bare name only.** No expressions, no string literals, no numbers. These all error with "invalid parameter": |
```basic |
ISSET(a$ + b$) ' WRONG: expression |
ISSET("a$") ' WRONG: string literal |
ISSET(42) ' WRONG: number |
ISSET() ' WRONG: empty |
``` |
- **Suffix is part of the name.** `a$` and `A#` are different names: |
```basic |
LET a$ = "foo" |
PRINT ISSET(a$) ' 1 |
PRINT ISSET(A#) ' 0 |
``` |
- **`LET name$` (no value) still counts as set.** `LET` always registers the variable; the value just defaults to empty string for `$` and zero for numeric. `ISSET` reports declaration, not "has a meaningful value". |
Typical use is guarding optional setup: |
```basic |
IF NOT ISSET(playerName$) THEN |
LET playerName$ = "Anonymous" |
END IF |
``` |
--- |
## Graphics |
```basic |
SCREEN 12 ' 640×480 VGA |
SCREEN 0, 800, 600 ' Custom size |
SCREEN 0, 1024, 768, "My Game" ' Custom size + title |
FULLSCREEN TRUE ' Borderless fullscreen (graphics only) |
FULLSCREEN FALSE ' Windowed |
``` |
| Mode | Resolution | |
|------|-----------| |
| 1 | 320×200 | |
| 2 | 640×350 | |
| 7 | 320×200 | |
| 9 | 640×350 | |
| 12 | 640×480 ← recommended | |
| 13 | 320×200 | |
### Drawing Primitives |
```basic |
PSET (x, y), color ' Pixel |
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