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|
module main
import gx
import gg
import time
import math
const (
size = 700
scale = 50.0
)
struct Context {
mut:
gg &gg.Context
}
fn main() {
mut context := &Context{
gg: 0
}
context.gg = gg.new_context(
width: size
height: size
font_size: 20
user_data: context
window_title: 'Graph builder'
create_window: true
frame_fn: frame
resizable: true
bg_color: gx.white
font_path: gg.system_font_path()
)
context.gg.run()
}
fn frame(mut ctx Context) {
ctx.gg.begin()
ctx.draw()
ctx.gg.end()
}
[live]
fn (ctx &Context) draw() {
s := gg.window_size()
mut w := s.width
mut h := s.height
if gg.high_dpi() {
w /= 2
h /= 2
}
ctx.gg.draw_line(0, h / 2, w, h / 2, gx.gray) // x axis
ctx.gg.draw_line(w / 2, 0, w / 2, h, gx.gray) // y axis
atime := f64(time.ticks() / 10)
stime := math.sin(2.0 * math.pi * f64(time.ticks() % 6000) / 6000)
mut y := 0.0
blue := gx.Color{
r: 100
g: 100
b: 200
}
red := gx.Color{
r: 200
g: 100
b: 100
}
y = 1.0
max := f32(w) / (2 * scale)
min := -max
for x := min; x <= max; x += 0.01 {
// y = x*x + 2
// y = x * x + stime * stime
// y = stime
// y = stime * h
y = stime * 1.0 * math.sin(x + stime + atime / 32) * ((h / 256) + x)
// y = (stime * x) * x + stime
// y = (x + 3) * (x + 3) / stime + stime*2.5
// y = math.sqrt(30.0 - x * x) * stime
// y -= (stime-0.5) + stime
// ctx.gg.draw_rect(f32((w/2) + x * scale), f32((h/2) - y * scale), 2, 2, blue)
ctx.gg.draw_rect(f32((w / 2) + x * scale), f32((h / 2) - y * scale), 2, (f32(y) * scale),
blue)
ctx.gg.draw_rect(f32((w / 2) + x * scale), f32((h / 2) + y * scale), 2, (f32(y) * scale) +
32, red)
}
}
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