Slow Glass Animation System

Format

New lines are significant, each item must be on a separate line but initial whitespace is ignored.

Lines starting with a # are ignored, as is all content from // to the end of the line and any content between /* and */.

Directives

scene {scene-name}
end scene - ends current scene
finish - stop processing commands (everything else ignored)
end file - same as above
include {file} - read file as if inserted at this point
display height/width {value} - sets window dimensions
display fullscreen - full screen window (TBD)
scale (fit | stretch | none) - how to adapt script scale to display
gravity {integer} - force of gravity in pixels per second
ground {integer} - y coordinate of ground level
script width {integer} - assumed width for this script
script height {integer} - assumed height for this script

Triggers

begin - runs on scene load (or file load if at top level)
after {duration} - runs after duration has elapsed from scene start
on key {key} -runs when key is pressed
on click - runs when any mouse key is pressed
at time {timecode} - runs when time of day matches the timecode
each time {timecode} - runs when time of day matches timecode (including wild cards)
every {duration} - runs after duration has elapsed from scene start and repeats
when (expression) - Evaluated once per second, runs once when the Python expression becomes truthy
while (expression) - Evaluated once per second, runs every time the Python expression is truthy

Commands

In most cases unnecessary words can be omitted, the minimum phrasing is shown in bold

System Commands

(log | print) {text…} - write text to console (or page element)
echo (on | off | flip) - log expanded and evaluated commands prior to executing them
wait {duration} - do nothing for given time (safe to use, not busy wait)
finish - stop application
list (scenes | all) - basic information on all scenes to console
list (scene | sprites | images | actions) [{scene-name}] - detailed information to console
debug {integer} {text…} - if a top level variable called DEBUGLEVEL exists and is lower than the number given print the text to console

Resource Management

from {folder} - take all resources from the named folder
reset from - set folder name to blank
(load | upload) {file} named {resource-name} [split {cols} by {rows}] - load resource of any type
unload {r-tag…} - remove resources from memory

Scene Management

start {scene-name} {parameters…} - start scene operating, pass information
stop [{scene}] - stop current scene or named scene (removes all images)
scene width {integer} - assumed width of this scene (TBD)
scene height {integer} - assumed width of this scene (TBD)
reset scene [{scene-name}] - put scene back into the original state
clone {scene-name} as {new-name} - creates separate duplicate of scene

Sprite Management

reset sprite {sprite-name} - set all sprite aspects back to their original state
sprite create [named {sprite-name}] [in {group-name}] from {resource-name} - creates a sprite, hidden, needs to be placed (AREA???)
replace {sprite-name} [with] {resource-name} - change the sprite image leaving all other aspects unchanged
with {scene-name} - sprite names without a prefix assumed to in the named scene
reset with - sprite names without a prefix assumed to be in the current scene (the default behaviour)

Sprite Placement

place {sprite-name} [hidden] at {x},{y} [depth {z}] [size|scale] [{w},{h}] - place an image on to the screen
put {resource-name} as (background | backdrop | top | bottom | left | right | ground | sky | foreground | frame) [at] [depth {z}] - place an image on to the screen in a fixed location
raise/lower {sprite-name} to {value} - set depth of image on screen to value
raise/lower {sprite-name} by {value} - change depth of image on screen up or down the set of images
show/hide {sprite-name} - reveal or remove images from screens, but still update changes
show/hide {sprite-name} for {duration}- reveal or remove images from screens just for a set length of time (TBD)
remove {sprite-name…} - remove images from the screen

Animated Sprite Management (all TBD except where noted)

window {sprite-name} at {ix},{iy},{iw},{ih} - define a window on the source image centered at ix,iy of size iw,ih zoom window {sprite-name} to {iw},{ih} [in {duration}]- set new window size on source image move window of {sprite-name} to {ix},{iy} [in {duration}]- set new window centre on source image scroll window of {sprite-name} up|down|left|right [at {speed}] - move window centre continuously at speed pixels per minute scroll {sprite-name} [at] {x} {y} - move window continuously at x / y pixels per minute DONE set animation rate of {sprite-name} to {value} - if image is sprite, update the frame every {value} seconds advance {sprite-name} to {number} - switch sprite to the given frame (set rate to zero to use) advance/reverse {sprite-name} by {number} - advance or reverse sprite by the given number of frames

(Movie image sources can only advance)

Sprite Movement

move {sprite-name} to {x},{y} [in {duration}] - Move image to a new location on screen in a given time
move {sprite-name} (horizontally | vertically) to {delta} [in {duration}] - Move image along an axis in a given time
move {sprite-name} (horizontally | vertically) by {delta} [in {duration}] - Move image along an axis in a given time
move {sprite-name} to {x},{y} [at {speed}] - Move image to a new location on screen at a given speed TBD
move {sprite-name} by {x},{y} [in {duration}] - Move image relative to current position a given time
move {sprite-name} by {x},{y} [at {speed}] - Move image relative to current position at a given speed TBD
set speed of {sprite-name} to {speed} [in {duration}] - set the speed of image (acclerate/slow if duration given) TBD
rotate {sprite-name} to {value} - turn image on screen to the given angle (degrees clockwise, 0 at top)
rotate {sprite-name} by {value} - turn image on screen by given angle (degrees clockwise)
pause/resume {sprite-name} - pause or resume all current changes to an image (does not change visibility)
throw {sprite-name} at {angle} [with speed] {speed} - throw the sprite in the given direction with the given speed
throw {sprite-name} stop - stop thrown motion
drop {sprite-name} - convenience function, same as throw {sprite} at 180, 0
align {sprite-name} (top | bottom | left | right) to {location} - move edge of sprite to the location, x or y

Sprite Sizing

resize {sprite-name} to {w},{h} [in {duration}] - change size of image on screen to given dimensions
scale {sprite-name} to {x%},{y%} [in {duration}] - change size of image on screen by given proportions of the original image size
scale {sprite-name} by {x%},{y%} [in {duration}] - change size of image on screen by given proportions of the current image size
flip {sprite-name} (horizontally | vertically) - flips sprite around given axis without changing position

Sprite Appearance

fade {sprite-name} (to | by | up | down) {value} [in {duration}] - set image transparency (0 = solid, 100 = transparent)
darken {sprite-name} to {value} [in {duration}] - make image darker (0 = no change, 100 = solid black)
lighten {sprite-name} to {value} [in {duration}] - make image lighter (0 = no change, 100 = solid white) (TBD)
blur {sprite-name} (to | by | up | down) {value} [in {duration}] - make blurry (0 = unchanged, 100 = very blurry)
tint {sprite-name} to {colour} - tint with named colour or hex code

Sprite Effects

flicker {sprite-name} by {amount} [with chance {percentage}] - randomly adjust transparency
flicker {sprite-name} stop
jiggle {sprite-name} by {x-amount} {y-amount} [with chance {percentage}] - randomly adjust position
jiggle {sprite-name} stop
flash {sprite-name} {number-of-times} - show for 1/10 second (hidden when finished)
blink {sprite-name} at {rate} per second [with chance {percentage}] - on/off at given rate
blink {sprite-name} stop
pulse {sprite-name} at {rate} per second from {min-value} to {max-value} - fade up and down
pulse {sprite-name} stop
wave {sprite-name} to {wave-max} in {duration} [with chance {percentage}] - random skew in height
wave {sprite-name} stop
sway {sprite-name} to {sway-max} in {duration} [with chance {percentage}] - random skew in width
sway {sprite-name} stop

Text Commands

text create {text-name} [in {group-name}] {text…} - create a named text item
text replace {text-name} {text…} - changes the displayed text
text add {text-name} {text…} - Adds the displayed text as additional line
text font {text-name} {font-name} - sets font face (no checking)
text size {text-name} {integer} - sets font size (no checking)
text align {text-name} (left | centre | right) - sets font alignment
text colour {text-name} {colour} - sets fill and stroke to named colour or hex code
text fill {text-name} {colour} - sets fill to named colour or hex code
text stroke {text-name} {colour} - sets stroke to named colour or hex code

Once created a text item is like a sprite and must be placed to become visible. Colour, font and other aspects of appearance can be changed after the text item has been created.

Graphic Commands

graphic create {graphic-name} [in {group-name}] as (rect | rectangle) {width} {height} [{corner-radius}]
graphic create {graphic-name} [in {group-name}] as circle {radius}
graphic create {graphic-name} [in {group-name}] as line {height} (rotate as required)
graphic create {graphic-name} [in {group-name}] as star {num-points} {outer-radius} [{inner-radius}]
graphic create {graphic-name} [in {group-name}] as circle {x-radius} {y-radius} (rotate as required)
graphic create {graphic-name} [in {group-name}] as grid {x-size} {y-size} (covers whole display)
graphic stroke {graphic-name} {colour} - sets fill to named colour or hex code
graphic fill {graphic-name} {colour} - sets fill to named colour or hex code
graphic stroke {graphic-name} {colour} - sets stroke to named colour or hex code
graphic stroke width {graphic-name} {integer} - sets stroke width

The word ‘shape’ can be used instead of ‘graphic’. Unlike text items you must set the appearance first, then created the graphic, to change the colour you must create a new graphic. Once created a text item is like a sprite and must be placed to become visible.

Sounds

play {resource-name} [fade in] [{duration}] [at volume] {level} - play a sound resource
set volume of {resource-name} to {level} [in {duration}] - set volume of sound resource (0-100)

Group Management

group create {group-name} [size {width} {height}] - create a named empty group, needs to be placed
group add {sprite-name} to {group-name} - add named sprites to the group (removes them from scene)

If you do not provide a group size it will be notionally the same size as the display. The named group can now be used as an image source for sprites, e.g. “place named-group at x,y,z” and all sprite commands operate on the whole group, however individual sprites within the group can still be operated on by name.

Flow Control

for {variable-name} in {values…}
(endfor | next) - assign each value to variable in turn
repeat
until {logical-expression} - run actions until expression is false
if {logical-expression}
endif - run actions if the expression is true

Logical Expressions

(false | no | n | none | 0 | 0.0) - are all false, everything else is true
**{value1} (is | equals | = | ==) {value2} - Javascript equality test
**{value1} (not | != | !==) {value2} - Javascript inequality test
**{value1} (> | < | >= | <=) {value2} - Javascript comparison

Mathematical Expressions

Anything in round brackets is assumed to be a mathemtical expression and on use will be replaced by its evaluated result. _Before- evaluation all variables will be expanded to their values.

All the standard operator symbols are supported, including ! and ^ for factorial and power. Brackets can be nested to any depth. ‘Pi’ and ‘e’ are replace by their respective values. The following functions are supported:

sin cos tan asin acos atan sinh cosh tanh asinh acosh atanh - trigonmetric, angles in degrees
Mod log ln - modulus & logarithms (not capitals)

Variable Creation

(let | make) {variable-name} be {value} - set the variable to the given value
assign {variable-names…} as {values…} - set multiple variables at once
choose {variable-name} from {values…} - randomly assign one of the values
match {variable-name} to {search-string} [at (start | end)] from {values…} - set variable to all the values that match
increment {variable-name} - if it looks like a number
deccrement {variable-name} - if it looks like a number

All variables start with $. Unset variables evaluate to “NONE”.

Variables are local to scenes, to access variables in other scenes use ${scene-name:variable-name}.

Variables in commands are evaluated every time the command is invoked, variables in triggers are expanded when the trigger is tested. Variables can NOT be used in directives

Built-in Variables

$SECONDS - current second (0 - 59)
$MINUTES - current minute (0 - 59)
$HOURS - current hour (0 - 23)
$ELAPSED - no. seconds since script started
$MILLIS - millseconds since script started (probably unique)
$DAY - day of month (1-31) (TBD)
$DAYNAME - name of day as a string
$DAYOFWEEK - Sunday = 1, Monday = 2 etc.
$WEEKDAY - yes/no
$WEEKEND - yes/no
$MORNING - yes/no
$AFTERNOON - yes/no
$EVENING - yes/no
$NIGHT - yes/no
$MONTH - month of year (1-12)
$MONTHNAME - name of the month as a string
$YEAR - year as a 4 digit number
$SEASON - season as lower case string (needs $HEMISPHERE set correctly)
$WINTER - yes/no
$SPRING - yes/no
$SUMMER - yes/no
$AUTUMN - yes/no
$WIDTH - width of the display in pixels
$HEIGHT - height of the display in pixels
$SCALEX, $SCALEY - Script scaling factors
$CENTREX, CENTREY - x, y coordinates of the centre of the display
$MOUSEX, $MOUSEY - current x & y coordinates of mouse TBD
$PERCENT - random value from 0 to 100, set on use
$CHANCE - random value from 0.0 to 1.0, set on use
$RANDOMX, $RANDOMY - random values somewhere within the current window
$KEY - key currently being pressed (None if none pressed)
$LASTKEY - last key that was pressed
$CLICKX, $CLICKY - x & y coordinates of the last time the mouse was clicked
$SCENENAME - name of the current scene
$PARAMETERS - values passed to this scene on start
${scene-name:SPRITES} - list of all sprite names in named scene
$SPRITES - list of all sprites in current scene
$IMAGES - as above for images
$SCENES - list of all scene names
$VARIABLES - list of all variables in the current scene ONLY

Sprite properties

Some sprite properties are available as variables, using the sprite tag as the variable name, followed by a ‘.’ and one of the following:

loc.x, x - current x coordinate
loc.y, y- current y coordinate
size.x, sx - current width
size.y, sy - current height
s - current speed (pixels per second) TBD
depth, z - current depth
angle - current rotation
visible - true/false visibity
role - if used in a put command, the name of the location
bounds - for debugging