examples/graph: update the graph instantly; add a couple of graphs

examples/hot_code_reloading/graph.v

@@ -8,7 +8,7 @@ import glfw
 import math 
 	
 const (
-	Size  = 1000
+	Size  = 700
 	Scale  = 50.0 
 )
 
@@ -29,6 +29,7 @@ fn main() {
 			always_on_top: true
 		})
 	} 
+	go update() // update the scene in the background in case the window isn't focused 
 	for { 
 		gg.clear(gx.White) 
 		ctx.draw()
@@ -42,8 +43,18 @@ fn (ctx &Context) draw() {
 	ctx.gg.draw_line(Size / 2, 0, Size / 2, Size) // y axis 
 	center := f64(Size / 2) 
 	for x := -10.0; x <= 10.0; x += 0.002 {
-		y := (x - 1) * (x - 1) - 2 
-		ctx.gg.draw_rect(center + x * Scale, 
-			center - y * Scale, 1, 1, gx.Black) 
+		y := x * x + 1 
+		//y := (x + 3) * (x + 3) - 1
+		//y := math.sqrt(30.0 - x * x)
+		ctx.gg.draw_rect(center + x * Scale, center - y * Scale, 1, 1, gx.Black) 
+		//ctx.gg.draw_rect(center + x * Scale, center + y * Scale, 1, 1, gx.Black) 
 	}
 }
+
+fn update() {
+	for { 
+		gg.post_empty_event() 
+		time.sleep_ms(300) 
+	} 
+ 
+} 

vlib/gg/gg.v

@@ -329,6 +329,10 @@ fn update() {
 	// # ui__post_empty_event();
 }
 
+pub fn post_empty_event() { 
+	glfw.post_empty_event() 
+} 
+
 pub fn (c GG) circle(x, y, r int) {
 }