| 1 | import gg |
| 2 | import math |
| 3 | |
| 4 | const pixel_count = 15000 |
| 5 | const p = 3 |
| 6 | const s = math.pi * 2 / f32(pixel_count) |
| 7 | const color = gg.Color{255, 255, 255, 255} |
| 8 | const background = gg.Color{20, 20, 64, 5} |
| 9 | const colors = [ |
| 10 | gg.Color{255, 255, 255, 255}, |
| 11 | gg.Color{255, 0, 255, 255}, |
| 12 | gg.Color{255, 255, 0, 255}, |
| 13 | gg.Color{0, 255, 255, 255}, |
| 14 | gg.Color{0, 0, 255, 255}, |
| 15 | gg.Color{0, 0, 0, 255}, |
| 16 | ]! |
| 17 | |
| 18 | mut k := 497 |
| 19 | mut scale := 200 |
| 20 | gg.start( |
| 21 | window_title: 'Spirograph' |
| 22 | bg_color: background |
| 23 | width: 900 |
| 24 | height: 950 |
| 25 | sample_count: 2 |
| 26 | frame_fn: fn [mut k, mut scale] (mut ctx gg.Context) { |
| 27 | wsize := gg.window_size() |
| 28 | ctx.begin() |
| 29 | ctx.draw_rect_filled(0, 0, wsize.width, wsize.height, gg.Color{10, 1, 30, 60}) |
| 30 | t := f64(ctx.frame) / 300 |
| 31 | d := math.sin(t) |
| 32 | if math.abs(d) < 0.0015 { |
| 33 | k++ |
| 34 | } |
| 35 | if ctx.pressed_keys[int(gg.KeyCode._0)] { |
| 36 | ctx.frame = 475 |
| 37 | } |
| 38 | if ctx.pressed_keys[int(gg.KeyCode.left)] { |
| 39 | k-- |
| 40 | } |
| 41 | if ctx.pressed_keys[int(gg.KeyCode.right)] { |
| 42 | k++ |
| 43 | } |
| 44 | if ctx.pressed_keys[int(gg.KeyCode.up)] { |
| 45 | scale++ |
| 46 | } |
| 47 | if ctx.pressed_keys[int(gg.KeyCode.down)] { |
| 48 | scale-- |
| 49 | } |
| 50 | d600 := math.sin(f64(ctx.frame) / 60) |
| 51 | cd600 := math.cos(d600) |
| 52 | mut pdj, mut pkj := [p]f64{}, [p]f64{} |
| 53 | for j := 0; j < p; j++ { |
| 54 | pdj[j], pkj[j] = math.pow(d, j), math.pow(k, j) |
| 55 | } |
| 56 | for i := 0; i < pixel_count; i++ { |
| 57 | mut x, mut y := 0.0, 0.0 |
| 58 | for j := 0; j < p; j++ { |
| 59 | a := pkj[j] * i * s |
| 60 | x += pdj[j] * math.sin(a - t) * cd600 |
| 61 | y += pdj[j] * math.cos(a - t) * cd600 |
| 62 | } |
| 63 | ctx.draw_rect_filled(f32(wsize.width / 2 + scale * x), |
| 64 | f32(wsize.height / 2 + scale * y), 1, 1, colors[i % colors.len]) |
| 65 | } |
| 66 | ctx.draw_text(wsize.width / 2 - 170, wsize.height - 15, |
| 67 | 'frame: ${ctx.frame:06}, k: ${k:4}, scale: ${scale:4}, arrows to change', |
| 68 | color: colors[1] |
| 69 | ) |
| 70 | ctx.end(how: .passthru) |
| 71 | } |
| 72 | ) |
| 73 | |