Initial project import

tools/v/examples/hot_reload/graph.v

@@ -0,0 +1,81 @@
+module main
+
+import gg
+import time
+import math
+
+const size = 700
+const scale = 50.0
+
+struct Context {
+mut:
+	gg &gg.Context = unsafe { nil }
+}
+
+fn main() {
+	mut context := &Context{}
+	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:      gg.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, gg.gray) // x axis
+	ctx.gg.draw_line(w / 2, 0, w / 2, h, gg.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 := gg.Color{
+		r: 100
+		g: 100
+		b: 200
+	}
+	red := gg.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)
+	}
+}