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Add adapted canvas demo for tinygo

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Johan Brandhorst 2019-06-23 15:08:02 +01:00
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18
Makefile
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@ -42,13 +42,17 @@ canvas: clean
cp $$(go env GOROOT)/misc/wasm/wasm_exec.js ./html/wasm_exec.js
tinygo-canvas: clean
docker run --rm -v $$(pwd):/go/src/github.com/johanbrandhorst/wasm-experiments tinygo/tinygo:0.6.1 /bin/bash -c "\
cd /go/src/github.com/johanbrandhorst/wasm-experiments && \
tinygo build -o ./html/test.wasm -target wasm --no-debug ./canvas/main.go && \
cp /usr/local/tinygo/targets/wasm_exec.js ./html/wasm_exec.js\
"
cp ./canvas/index.html ./html/index.html
cp ./canvas/main.go ./html/main.go
#docker run --rm -v $$(pwd):/go/src/github.com/johanbrandhorst/wasm-experiments tinygo/tinygo:0.6.1 /bin/bash -c "\
# cd /go/src/github.com/johanbrandhorst/wasm-experiments && \
# tinygo build -o ./html/test.wasm -target wasm --no-debug ./canvas/main.go && \
# cp /usr/local/tinygo/targets/wasm_exec.js ./html/wasm_exec.js\
#"
# Requires tinygo with experimental GC
# https://github.com/tinygo-org/tinygo/pull/350
tinygo build -o ./html/test.wasm -target wasm --no-debug ./tinygo-canvas/main.go
cp ~/go/src/github.com/tinygo-org/tinygo/targets/wasm_exec.js ./html/
cp ./tinygo-canvas/index.html ./html/index.html
cp ./tinygo-canvas/main.go ./html/main.go
.PHONY: ebiten
ebiten: clean

6
README.md
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@ -82,6 +82,12 @@ send a HTTP request, parse the result and write it to the DOM.
An updated version of the [repulsion](https://stdiopt.github.io/gowasm-experiments/repulsion)
demo by [Luis Figuerido](https://github.com/stdiopt) usin Go 1.12.
### TinyGo-Canvas
Same as above but slightly adapted for TinyGo but avoiding the use of JS callbacks
in Go code. Requires an experimental version of TinyGo to build. Based on work
by [Justin Clift](https://github.com/justinclift).
### Ebiten
A short demo of using the [Ebiten game engine](https://github.com/hajimehoshi/ebiten)

201
tinygo-canvas/LICENSE Normal file
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@ -0,0 +1,201 @@
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125
tinygo-canvas/index.html Normal file
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@ -0,0 +1,125 @@
<html>
<head>
<title>go webassembly - repulsion</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/monokai.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/languages/go.min.js"></script>
<script src="wasm_exec.js"></script>
<script>
var wasm;
function countChange(evt) {
wasm.exports.countChange(evt.target.value);
}
function moveHandler(evt) {
wasm.exports.moveHandler(evt.clientX, evt.clientY);
}
function renderFrame(evt) {
wasm.exports.renderFrame(evt);
}
function speedInput(evt) {
wasm.exports.speedInput(evt.target.value);
}
hljs.configure({ tabReplace: ' ' });
const go = new Go();
WebAssembly.instantiateStreaming(fetch('test.wasm'), go.importObject).then(res => {
wasm = res.instance;
go.run(wasm);
document.addEventListener("mousemove", moveHandler);
document.getElementById("count").addEventListener("change", countChange);
document.getElementById("speed").addEventListener("input", speedInput);
})
window.onload = function () {
linkRange('count', 'count-value')
linkRange('speed', 'speed-value')
// Go code background
fetch('main.go').then(res => res.text()).then(res => {
let codeEl = document.getElementById("code")
codeEl.innerHTML = res.replace(/&/g, "&amp;")
.replace(/>/g, "&gt;")
.replace(/</g, "&lt;")
hljs.highlightBlock(codeEl)
})
}
function linkRange(id, idValue) {
let El = document.getElementById(id)
let valEl = document.getElementById(idValue)
El.addEventListener("input", function () { valEl.innerHTML = El.value })
valEl.innerHTML = El.value
}
</script>
<style>
body,
pre {
margin: 0;
padding: 0;
}
.control-group {
display: flex;
align-items: center;
justify-content: flex-start;
}
.control-group label {
flex: 0;
flex-basis: 100px;
}
.control-group input {
flex-grow: 0;
}
.control-group span {
width: 50px;
}
.control {
position: fixed;
padding: 20px;
background: rgba(0, 0, 0, 0.2);
color: #FFF;
top: 0;
right: 0;
}
#mycanvas {
position: fixed;
opacity: 0.9;
width: 100%;
height: 100%;
top: 0;
right: 0;
bottom: 0;
left: 0;
}
</style>
</head>
<body>
<div class="code">
<pre><code id="code"></code></pre>
</div>
<canvas id="mycanvas"></canvas>
<div class="control">
<div id="fps">0</div>
<div class="control-group">
<label>Speed</label><input id="speed" type="range" min="10" max="1000" value="160"> <span id="speed-value">
160</span>
</div>
<div class="control-group">
<label>Number of dots</label><input id="count" type="range" min="10" max="1000" value="100"> <span
id="count-value"> 100</span>
</div>
</div>
</body>
</html>

197
tinygo-canvas/main.go Normal file
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@ -0,0 +1,197 @@
// +build js,wasm
package main
import (
"math"
"math/rand"
"strconv"
"syscall/js"
)
var (
width float64
height float64
mousePos [2]float64
ctx, doc js.Value
canvasEl js.Value
dt DotThing
tmark float64
markCount = 0
tdiffSum float64
)
func main() {
// Init Canvas stuff
doc = js.Global().Get("document")
canvasEl = doc.Call("getElementById", "mycanvas")
width = doc.Get("body").Get("clientWidth").Float()
height = doc.Get("body").Get("clientHeight").Float()
canvasEl.Call("setAttribute", "width", width)
canvasEl.Call("setAttribute", "height", height)
ctx = canvasEl.Call("getContext", "2d")
// Set up dot thing
dt = DotThing{speed: 160}
dt.SetNDots(100)
dt.lines = false
js.Global().Call("requestAnimationFrame", js.Global().Get("renderFrame"))
}
// * Handlers for JS callback functions *
//go:export speedInput
func speedInput(fval float64) {
dt.speed = fval
}
//go:export countChange
func countChange(intVal int) {
dt.SetNDots(intVal)
}
//go:export moveHandler
func moveHandler(cx int, cy int) {
mousePos[0] = float64(cx)
mousePos[1] = float64(cy)
}
//go:export renderFrame
func renderFrame(now float64) {
tdiff := now - tmark
tdiffSum += now - tmark
markCount++
if markCount > 10 {
doc.Call("getElementById", "fps").Set("innerHTML", "FPS: "+strconv.FormatFloat(1000/(tdiffSum/float64(markCount)), 'f', 1, 64))
tdiffSum, markCount = 0, 0
}
tmark = now
// Pool window size to handle resize
curBodyW := doc.Get("body").Get("clientWidth").Float()
curBodyH := doc.Get("body").Get("clientHeight").Float()
if curBodyW != width || curBodyH != height {
width, height = curBodyW, curBodyH
canvasEl.Set("width", width)
canvasEl.Set("height", height)
}
dt.Update(tdiff / 1000)
js.Global().Call("requestAnimationFrame", js.Global().Get("renderFrame"))
}
// DotThing manager
type DotThing struct {
dots []*Dot
lines bool
speed float64
}
// Update updates the dot positions and draws
func (dt *DotThing) Update(dtTime float64) {
if dt.dots == nil {
return
}
ctx.Call("clearRect", 0, 0, width, height)
// Update
for i, dot := range dt.dots {
if dot.pos[0] < dot.size {
dot.pos[0] = dot.size
dot.dir[0] *= -1
}
if dot.pos[0] > width-dot.size {
dot.pos[0] = width - dot.size
dot.dir[0] *= -1
}
if dot.pos[1] < dot.size {
dot.pos[1] = dot.size
dot.dir[1] *= -1
}
if dot.pos[1] > height-dot.size {
dot.pos[1] = height - dot.size
dot.dir[1] *= -1
}
mdx := mousePos[0] - dot.pos[0]
mdy := mousePos[1] - dot.pos[1]
d := math.Sqrt(mdx*mdx + mdy*mdy)
if d < 200 {
dInv := 1 - d/200
dot.dir[0] += (-mdx / d) * dInv * 8
dot.dir[1] += (-mdy / d) * dInv * 8
}
for j, dot2 := range dt.dots {
if i == j {
continue
}
mx := dot2.pos[0] - dot.pos[0]
my := dot2.pos[1] - dot.pos[1]
d := math.Sqrt(mx*mx + my*my)
if d < 100 {
dInv := 1 - d/100
dot.dir[0] += (-mx / d) * dInv
dot.dir[1] += (-my / d) * dInv
}
}
dot.dir[0] *= 0.1 //friction
dot.dir[1] *= 0.1 //friction
dot.pos[0] += dot.dir[0] * dt.speed * dtTime * 10
dot.pos[1] += dot.dir[1] * dt.speed * dtTime * 10
ctx.Set("globalAlpha", 0.5)
ctx.Call("beginPath")
hexCol := hexFormat(dot.color)
ctx.Set("fillStyle", hexCol)
ctx.Set("strokeStyle", hexCol)
ctx.Set("lineWidth", dot.size)
ctx.Call("arc", dot.pos[0], dot.pos[1], dot.size, 0, 2*math.Pi)
ctx.Call("fill")
}
}
// SetNDots reinitializes dots with n size
func (dt *DotThing) SetNDots(n int) {
dt.dots = make([]*Dot, n)
for i := 0; i < n; i++ {
dt.dots[i] = &Dot{
pos: [2]float64{
rand.Float64() * width,
rand.Float64() * height,
},
dir: [2]float64{
rand.NormFloat64(),
rand.NormFloat64(),
},
color: uint32(rand.Intn(0xFFFFFF)),
size: 10,
}
}
}
// Adapted from the Go source: https://github.com/golang/go/blob/4ce6a8e89668b87dce67e2f55802903d6eb9110a/src/fmt/format.go#L248-L252
func hexFormat(u uint32) string {
digits := "0123456789abcdefx"
buf := make([]uint8, 6)
i := len(buf)
for u >= 16 {
i--
buf[i] = digits[u&0xF]
u >>= 4
}
i--
buf[i] = digits[u]
return "#" + string(buf)
}
// Dot represents a dot ...
type Dot struct {
pos [2]float64
dir [2]float64
color uint32
size float64
}