examples/hot_code_reloading: graph builder

examples/hot_code_reloading/graph.v

@@ -0,0 +1,60 @@
+module main
+
+import gx
+import gl
+import gg
+import glfw
+	
+const (
+	WIDTH  = 1000
+	HEIGHT = 1000
+	SCALE  = 50
+)
+
+struct Context {
+	mut:
+	gg *gg.GG
+}
+
+fn main() {
+	glfw.init()
+	mut ctx := &Context{gg: 0}
+	window := glfw.create_window(glfw.WinCfg{
+		title: 'graph builder'
+		width: 1000
+		height: 1000
+		ptr: ctx
+	})
+	window.make_context_current()
+	gg.init()
+	ctx.gg = gg.new_context(gg.Cfg {
+		 width: 1000
+		 height: 1000
+		 use_ortho: true 
+	})
+	for {
+		gl.clear()
+		gl.clear_color(255, 255, 255, 255)
+		ctx.draw()
+		window.swap_buffers()
+		glfw.wait_events()
+	}
+}
+
+fn (ctx mut Context) draw() {
+	// x axis
+	ctx.gg.draw_line(0, HEIGHT / 2, WIDTH, HEIGHT / 2)
+	// y axis
+	ctx.gg.draw_line(WIDTH / 2, 0, WIDTH / 2, HEIGHT)
+	mut prev_x := f64(0)
+	mut prev_y := f64(0)
+	center := f64(WIDTH / 2)
+	for x := f64(- 10); x <= f64(10); x += 0.01 {
+		y := x * x * f64(SCALE)
+		// gx.draw_line_c(center + prev_x, center+prev_y, center + int(x*float(10)), center+y, gx.BLACK)
+		ctx.gg.draw_rect(int(center) + int(x * f64(SCALE)), int(center - y), 1, 1, gx.Black)
+		// gx.draw_rect_f(center + (x * f64(SCALE)), center - y, 1, 1, gx.BLACK)
+		prev_x = x
+		prev_y = y
+	}
+}