examples: shrink examples/gg/minimal.v even more

examples/gg/minimal.v

@@ -1,19 +1,17 @@
 import gg
 
-fn main() {
-	mut ctx := gg.new_context(
-		window_title: 'Hello'
-		bg_color: gg.Color{240, 240, 128, 255}
-		width: 320
-		height: 240
-		frame_fn: on_frame
-	)
-	ctx.run()
-}
-
-fn on_frame(ctx &gg.Context) {
-	ctx.begin()
-	ctx.draw_text(40, 100, 'GG frame: ${ctx.frame:06}', size: 30, color: gg.Color{50, 50, 255, 255})
-	ctx.show_fps()
-	ctx.end()
-}
+gg.start(
+	window_title: 'Hello'
+	bg_color: gg.Color{240, 240, 128, 255}
+	width: 320
+	height: 240
+	frame_fn: fn (ctx &gg.Context) {
+		ctx.begin()
+		ctx.draw_text(40, 100, 'GG frame: ${ctx.frame:06}',
+			size: 30
+			color: gg.Color{50, 50, 255, 255}
+		)
+		ctx.show_fps()
+		ctx.end()
+	}
+)

vlib/gg/gg.c.v

@@ -441,6 +441,16 @@ fn gg_fail_fn(msg &char, user_data voidptr) {
 
 //---- public methods
 
+// start creates a new context and runs it right away.
+// It is a convenient way to start short/throwaway gg based prototypes,
+// that do not need to keep and update their own state, like simple
+// animations/visualisations that depend only on the time, or the ctx.frame counter.
+// Use gg.new_context() for more complex ones.
+pub fn start(cfg Config) {
+	mut ctx := new_context(cfg)
+	ctx.run()
+}
+
 // new_context returns an initialized `Context` allocated on the heap.
 pub fn new_context(cfg Config) &Context {
 	mut ctx := &Context{