mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
67 lines
1.3 KiB
V
67 lines
1.3 KiB
V
module main
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import gx
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import gg
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import time
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import math
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const (
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size = 700
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scale = 50.0
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pi = math.pi
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)
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struct Context {
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mut:
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gg &gg.Context
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}
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fn main() {
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mut context := &Context{
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gg: 0
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}
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context.gg = gg.new_context({
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width: size
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height: size
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font_size: 20
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use_ortho: true
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user_data: context
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window_title: 'Graph builder'
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create_window: true
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frame_fn: frame
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bg_color: gx.white
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font_path: gg.system_font_path()
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})
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context.gg.run()
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}
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fn frame(mut ctx Context) {
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ctx.gg.begin()
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ctx.draw()
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ctx.gg.end()
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}
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[live]
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fn (ctx &Context) draw() {
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center := f32(size / 2)
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ctx.gg.draw_line(0, center, size, center, gx.gray) // x axis
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ctx.gg.draw_line(center, 0, center, size, gx.gray) // y axis
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atime := f64(time.ticks() / 10)
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stime := math.sin(2.0 * pi * f64(time.ticks() % 6000) / 6000)
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mut y := 0.0
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y = 1.0
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for x := -10.0; x <= 10.0; x += 0.02 {
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// y = x*x + 2
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y = x * x + stime * stime
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// y = stime
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// y = stime * x
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y = stime * 1.0 * math.sin(x + stime + atime / 50) * x
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// y = (stime * x) * x + stime
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// y = (x + 3) * (x + 3) / stime + stime*2.5
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// y = math.sqrt(30.0 - x * x) * stime
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// y -= (stime-0.5) + stime
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ctx.gg.draw_rect(f32(center + x * scale), f32(center - y * scale), 1, 1, gx.blue)
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ctx.gg.draw_rect(f32(center + x * scale), f32(center + y * scale), 1, 1, gx.red)
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}
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}
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