module main import gx import gg import time import math const ( size = 700 scale = 50.0 ) struct Context { mut: gg &gg.Context = unsafe { nil } } 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 ) 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_filled(f32((w/2) + x * scale), f32((h/2) - y * scale), 2, 2, blue) ctx.gg.draw_rect_filled(f32((w / 2) + x * scale), f32((h / 2) - y * scale), 2, (f32(y) * scale), blue) ctx.gg.draw_rect_filled(f32((w / 2) + x * scale), f32((h / 2) + y * scale), 2, (f32(y) * scale) + 32, red) } }