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examples: increase the resolution of the generated image in examples/wasm/mandelbrot

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Delyan Angelov 2023-12-11 16:54:09 +02:00
parent 1b3c4f596e
commit 2de9a24f2f
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6 changed files with 40 additions and 41 deletions
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2
examples/wasm/mandelbrot/README.md
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@ -3,7 +3,7 @@
## Using only V
```
v run main.v
v run .
```
## Using Python or Emscripten

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29
examples/wasm/mandelbrot/main.v
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@ -1,29 +0,0 @@
module main
import vweb
import os
const http_port = 3001
struct App {
vweb.Context
}
fn main() {
vweb.run(new_app(), http_port)
}
fn new_app() &App {
mut app := &App{}
os.execute_or_panic('v -b wasm -os browser mandelbrot.wasm.v')
app.mount_static_folder_at(os.resource_abs_path('./'), '/')
return app
}
@['/'; get]
pub fn (mut app App) controller_mandelbrot() !vweb.Result {
file := os.read_file('mandelbrot.html') or { panic(err) }
return app.html(file)
}

14
examples/wasm/mandelbrot/mandelbrot.html
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@ -7,21 +7,24 @@
<title>V Mandelbrot WebAssembly Example</title>
</head>
<body>
<p>Below you should see the picture of the Mandelbrot set,
<br>calculated in WASM, and shown in a Canvas element.</p>
<canvas
id="canvas"
width="200"
height="200"
style="width: 100%; height: 100%; image-rendering: crisp-edges"
width="400"
height="400"
style="image-rendering: crisp-edges"
></canvas>
<script>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.font = "32px serif";
ctx.fillText("Please wait...", 100, 250);
var memory;
function get_string(ptr, len) {
const buf = new Uint8Array(memory.buffer, ptr, len);
const str = new TextDecoder("utf8").decode(buf);
return str;
}
@ -43,8 +46,9 @@
WebAssembly.instantiateStreaming(fetch("mandelbrot.wasm"), {
env: env,
}).then((res) => {
console.log(env.canvas_x())
console.log(env.canvas_y())
memory = res.instance.exports["memory"];
console.time("main.main");
res.instance.exports["main.main"]();
console.timeEnd("main.main");

14
examples/wasm/mandelbrot/mandelbrot.wasm.v
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@ -4,10 +4,12 @@ fn JS.setpixel(x int, y int, c f64)
// `main` must be public!
pub fn main() {
println('starting main.main...')
max_x := JS.canvas_x()
max_y := JS.canvas_y()
println('starting main.main!')
middle_x := max_x / 2
middle_y := max_y / 2
mut y := 0
for y < max_y {
@ -16,8 +18,8 @@ pub fn main() {
for x < max_x {
x += 1
e := (f64(y) / 50) - 1.5
f := (f64(x) / 50) - 1.0
e := (f64(y) / middle_y) - 1.5
f := (f64(x) / middle_x) - 1.0
mut a := 0.0
mut b := 0.0
@ -36,6 +38,6 @@ pub fn main() {
JS.setpixel(x, y, c)
}
}
panic('reached the end!')
// TODO: remove the need for panic here:
panic('reached the end of main.main')
}

22
examples/wasm/mandelbrot/serve_folder.v Normal file
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@ -0,0 +1,22 @@
module main
import vweb
import os
struct App {
vweb.Context
}
fn main() {
os.chdir(os.dir(@FILE))!
cmd := '${os.quoted_path(@VEXE)} -b wasm -os browser mandelbrot.wasm.v'
println('>> compiling mandelbrot.wasm.v, using: ${cmd}')
os.execute_or_panic(cmd)
mut app := App{}
app.mount_static_folder_at(os.resource_abs_path('.'), '/')
vweb.run(app, 3001)
}
pub fn (mut app App) index() vweb.Result {
return app.html(os.read_file('mandelbrot.html') or { '' })
}