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v/vlib/gg/testdata/draw_simple_polygons.vv

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module main
import gg
import gx
struct App {
mut:
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gg &gg.Context = unsafe { 0 }
rotation f32 = f32(0)
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edge int = 3
}
[console]
fn main() {
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println('rotation: left arrow key, right arrow key')
println('center polygon edge: up arrow key, down arrow key')
mut app := &App{}
app.gg = gg.new_context(
window_title: 'Simple Polygons'
width: 500
height: 500
bg_color: gx.black
event_fn: event
frame_fn: render
user_data: app
)
app.gg.run()
}
fn render(app &App) {
app.gg.begin()
color := gx.Color{
r: 175
g: 0
b: 0
a: 200
}
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mut edge := 3
for i := 0; i <= 5; i++ {
for j := 0; j <= 5; j++ {
if i == 0 || j == 0 || i == 5 || j == 5 {
app.gg.draw_polygon_filled(50 + 80 * i, 50 + 80 * j, 30, edge, app.rotation,
color)
edge++
}
}
}
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app.gg.draw_polygon_filled(250, 250, 150, app.edge, app.rotation, color)
app.gg.end()
}
fn event(e &gg.Event, mut app App) {
match e.typ {
.key_down {
match e.key_code {
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.up {
app.edge++
}
.down {
if app.edge > 3 {
app.edge--
}
}
.right {
app.rotation++
}
.left {
app.rotation--
}
.escape {
app.gg.quit()
}
else {}
}
}
else {}
}
}