spx - A 2D Game Engine for learning Go+
Tutorials
How to run spx tutorials?
- Download Go+ and build it. See https://github.com/goplus/gop#how-to-build.
- Download spx and build it.
- git clone
[email protected]:goplus/spx.git - cd spx
- go install -v ./...
- git clone
- Build tutorials and run.
- cd tutorial/xxx
- gop run .
tutorial/01-Weather
Through this example you can learn how to listen events and do somethings.
Here is some codes in Kai.spx:
onStart => {
setCostume "kai-a"
play recordingWhere
say "Where do you come from?", 2
broadcast "1"
}
onMsg "2", => {
play recordingCountry
say "What's the climate like in your country?", 3
broadcast "3"
}
onMsg "4", => {
play recordingBest
say "Which seasons do you like best?", 3
broadcast "5"
}
We call onStart and onMsg to listen events. onStart is called when the program is started. And onMsg is called when someone calls broadcast to broadcast a message.
When the program starts, Kai says Where do you come from?, and then broadcasts the message 1. Who will recieve this message? Let's see codes in Jaime.spx:
onMsg "1", => {
play recordingComeFrom
say "I come from England.", 2
broadcast "2"
}
onMsg "3", => {
play recordingMild
say "It's mild, but it's not always pleasant.", 4
# ...
broadcast "4"
}
Yes, Jaime recieves the message 1 and says I come from England.. Then he broadcasts the message 2. Kai recieves it and says What's the climate like in your country?.
The following procedures are very similar. In this way you can implement dialogues between multiple actors.
tutorial/02-Dragon
Through this example you can learn how to define variables and show them on the stage.
Here is all the codes of Dragon:
var (
score int
)
onStart => {
score = 0
for {
turn rand(-30, 30)
step 5
if touching("Shark") {
score++
play chomp, true
step -100
}
}
}
We define a variable named score for Dragon. After the program starts, it moves randomly. And every time it touches Shark, it gains one score.
How to show the score on the stage? You don't need write code, just add a stageMonitor object into resources/index.json:
{
"zorder": [
{
"type": "stageMonitor",
"target": "Dragon",
"val": "getVar:score",
"color": 15629590,
"label": "score",
"mode": 1,
"x": 5,
"y": 5,
"visible": true
}
]
}
