module main import term.ui as tui // The color palette, taken from Google's Material design const ( colors = [ [ tui.Color{239, 154, 154}, tui.Color{244, 143, 177}, tui.Color{206, 147, 216}, tui.Color{179, 157, 219}, tui.Color{159, 168, 218}, tui.Color{144, 202, 249}, tui.Color{129, 212, 250}, tui.Color{128, 222, 234}, tui.Color{128, 203, 196}, tui.Color{165, 214, 167}, tui.Color{197, 225, 165}, tui.Color{230, 238, 156}, tui.Color{255, 245, 157}, tui.Color{255, 224, 130}, tui.Color{255, 204, 128}, tui.Color{255, 171, 145}, tui.Color{188, 170, 164}, tui.Color{238, 238, 238}, tui.Color{176, 190, 197}, ], [ tui.Color{244, 67, 54}, tui.Color{233, 30, 99}, tui.Color{156, 39, 176}, tui.Color{103, 58, 183}, tui.Color{63, 81, 181}, tui.Color{33, 150, 243}, tui.Color{3, 169, 244}, tui.Color{0, 188, 212}, tui.Color{0, 150, 136}, tui.Color{76, 175, 80}, tui.Color{139, 195, 74}, tui.Color{205, 220, 57}, tui.Color{255, 235, 59}, tui.Color{255, 193, 7}, tui.Color{255, 152, 0}, tui.Color{255, 87, 34}, tui.Color{121, 85, 72}, tui.Color{120, 120, 120}, tui.Color{96, 125, 139}, ], [ tui.Color{198, 40, 40}, tui.Color{173, 20, 87}, tui.Color{106, 27, 154}, tui.Color{69, 39, 160}, tui.Color{40, 53, 147}, tui.Color{21, 101, 192}, tui.Color{2, 119, 189}, tui.Color{0, 131, 143}, tui.Color{0, 105, 92}, tui.Color{46, 125, 50}, tui.Color{85, 139, 47}, tui.Color{158, 157, 36}, tui.Color{249, 168, 37}, tui.Color{255, 143, 0}, tui.Color{239, 108, 0}, tui.Color{216, 67, 21}, tui.Color{78, 52, 46}, tui.Color{33, 33, 33}, tui.Color{55, 71, 79}, ], ] ) const ( frame_rate = 30 // fps msg_display_time = 5 * frame_rate w = 200 h = 100 space = ' ' spaces = ' ' select_color = 'Select color: ' select_size = 'Size: + -' help_1 = '╭────────╮' help_2 = '│ HELP │' help_3 = '╰────────╯' ) struct App { mut: tui &tui.Context = 0 header_text []string mouse_pos Point msg string msg_hide_tick int primary_color tui.Color = colors[1][6] secondary_color tui.Color = colors[1][9] bg_color tui.Color = tui.Color{0, 0, 0} color_index int drawing [][]tui.Color = [][]tui.Color{len: h, init: []tui.Color{len: w}} size int = 1 should_redraw bool = true is_dragging bool } struct Point { mut: x int y int } fn main() { mut app := &App{} app.tui = tui.init({ user_data: app frame_fn: frame event_fn: event frame_rate: frame_rate hide_cursor: true window_title: 'V terminal pixelart drawing app' }) app.mouse_pos.x = 40 app.mouse_pos.y = 15 app.tui.clear() app.tui.run() } fn frame(x voidptr) { mut app := &App(x) mut redraw := app.should_redraw if app.msg != '' && app.tui.frame_count >= app.msg_hide_tick { app.msg = '' redraw = true } if redraw { app.render(false) app.should_redraw = false } } fn event(event &tui.Event, x voidptr) { mut app := &App(x) match event.typ { .mouse_down { app.is_dragging = true if app.tui.window_height - event.y < 5 { app.footer_click(event) } else { app.paint(event) } } .mouse_up { app.is_dragging = false } .mouse_drag { app.mouse_pos = { x: event.x y: event.y } app.paint(event) } .mouse_move { app.mouse_pos = { x: event.x y: event.y } } .mouse_scroll { app.mouse_pos = { x: event.x y: event.y } if event.direction == .down { app.inc_size() } else { app.dec_size() } } .key_down { match event.code { .f1, ._1 { oevent := *event nevent := { oevent | button: tui.MouseButton.left, x: app.mouse_pos.x , y: app.mouse_pos.y } app.paint(nevent) } .f2, ._2 { oevent := *event nevent := { oevent | button: tui.MouseButton.right, x: app.mouse_pos.x , y: app.mouse_pos.y } app.paint(nevent) } .space { oevent := *event nevent := { oevent | button: tui.MouseButton.middle, x: app.mouse_pos.x , y: app.mouse_pos.y } app.paint(nevent) } .j, .down { if event.modifiers & tui.shift != 0 { app.set_pixel((1 + app.mouse_pos.x) / 2, app.mouse_pos.y, app.primary_color) } app.mouse_pos.y++ } .k, .up { if event.modifiers & tui.shift != 0 { app.set_pixel((1 + app.mouse_pos.x) / 2, app.mouse_pos.y, app.primary_color) } app.mouse_pos.y-- } .h, .left { if event.modifiers & tui.shift != 0 { app.set_pixel((1 + app.mouse_pos.x) / 2, app.mouse_pos.y, app.primary_color) } app.mouse_pos.x -= 2 } .l, .right { if event.modifiers & tui.shift != 0 { app.set_pixel((1 + app.mouse_pos.x) / 2, app.mouse_pos.y, app.primary_color) } app.mouse_pos.x += 2 } .t { mut c := if event.modifiers & tui.shift != 0 { app.color_index - 19 } else { app.color_index + 19 } if c < 0 { c = 0 } cx := c % 19 cy := (c / 19) % 3 color := colors[cy][cx] app.primary_color = color app.color_index = c % (19 * 3) } .r { mut c := if event.modifiers & tui.shift != 0 { app.color_index - 1 } else { app.color_index + 1 } if c < 0 { c = 0 } cx := c % 19 cy := (c / 19) % 3 color := colors[cy][cx] app.primary_color = color app.color_index = c % (19 * 3) } .plus { app.inc_size() } .minus { app.dec_size() } .c { app.drawing = [][]tui.Color{len: h, init: []tui.Color{len: w}} } .q, .escape { app.render(true) exit(0) } else {} } } else {} } app.should_redraw = true } fn (mut app App) render(paint_only bool) { app.tui.clear() app.draw_header() app.draw_content() if !paint_only { app.draw_footer() app.draw_cursor() } app.tui.flush() } fn (mut app App) set_pixel(x_ int, y_ int, c tui.Color) { // Term coords start at 1, and adjust for the header x, y := x_ - 1, y_ - 4 if y < 0 || app.tui.window_height - y < 3 { return } if y >= app.drawing.len || x < 0 || x >= app.drawing[0].len { return } app.drawing[y][x] = c } fn (mut app App) paint(event &tui.Event) { x_start, y_start := int(f32((event.x - 1) / 2) - app.size / 2 + 1), event.y - app.size / 2 color := match event.button { .left { app.primary_color } .right { app.secondary_color } else { app.bg_color } } for x in x_start .. x_start + app.size { for y in y_start .. y_start + app.size { app.set_pixel(x, y, color) } } } fn (mut app App) draw_content() { w, mut h := app.tui.window_width / 2, app.tui.window_height - 8 if h > app.drawing.len { h = app.drawing.len } for row_idx, row in app.drawing[..h] { app.tui.set_cursor_position(0, row_idx + 4) mut last := tui.Color{0, 0, 0} for cell in row[..w] { if cell.r == 0 && cell.g == 0 && cell.b == 0 { if !(cell.r == last.r && cell.g == last.g && cell.b == last.b) { app.tui.reset() } } else { if !(cell.r == last.r && cell.g == last.g && cell.b == last.b) { app.tui.set_bg_color(cell) } } app.tui.write(spaces) last = cell } app.tui.reset() } } fn (mut app App) draw_cursor() { if app.mouse_pos.y in [3, app.tui.window_height - 5] { // inside the horizontal separators return } cursor_color := if app.is_dragging { tui.Color{220, 220, 220} } else { tui.Color{160, 160, 160} } app.tui.set_bg_color(cursor_color) if app.mouse_pos.y >= 3 && app.mouse_pos.y <= app.tui.window_height - 4 { // inside the main content mut x_start := int(f32((app.mouse_pos.x - 1) / 2) - app.size / 2 + 1) * 2 - 1 mut y_start := app.mouse_pos.y - app.size / 2 mut x_end := x_start + app.size * 2 - 1 mut y_end := y_start + app.size - 1 if x_start < 1 { x_start = 1 } if y_start < 4 { y_start = 4 } if x_end > app.tui.window_width { x_end = app.tui.window_width } if y_end > app.tui.window_height - 5 { y_end = app.tui.window_height - 5 } app.tui.draw_rect(x_start, y_start, x_end, y_end) } else { app.tui.draw_text(app.mouse_pos.x, app.mouse_pos.y, space) } app.tui.reset() } fn (mut app App) draw_header() { if app.msg != '' { app.tui.set_color({ r: 0 g: 0 b: 0 }) app.tui.set_bg_color({ r: 220 g: 220 b: 220 }) app.tui.draw_text(0, 0, ' $app.msg ') app.tui.reset() } app.tui.draw_text(3, 2, /* 'tick: $app.tui.frame_count | ' + */ 'terminal size: ($app.tui.window_width, $app.tui.window_height) | primary color: $app.primary_color.hex() | secondary color: $app.secondary_color.hex()') app.tui.horizontal_separator(3) } fn (mut app App) current_color(x int, y int) bool { return app.color_index == x + (y * 19) } fn (mut app App) draw_footer() { _, wh := app.tui.window_width, app.tui.window_height app.tui.horizontal_separator(wh - 4) for i, color_row in colors { for j, color in color_row { x := j * 3 + 19 y := wh - 3 + i app.tui.set_bg_color(color) if app.current_color(j, i) { app.tui.set_color(tui.Color{0, 0, 0}) app.tui.draw_text(x, y, '><') app.tui.reset_color() } else { app.tui.draw_rect(x, y, x + 1, y) } } } app.tui.reset_bg_color() app.tui.draw_text(3, wh - 3, select_color) app.tui.set_bg_color(app.primary_color) app.tui.draw_text(3 + select_color.len, wh - 3, ' ') app.tui.reset_bg_color() app.tui.bold() app.tui.draw_text(3, wh - 1, '$select_size $app.size') app.tui.reset() // TODO: help button // if ww >= 90 { // app.tui.draw_text(80, wh - 3, help_1) // app.tui.draw_text(80, wh - 2, help_2) // app.tui.draw_text(80, wh - 1, help_3) // } } [inline] fn (mut app App) inc_size() { if app.size < 20 { app.size++ } app.show_msg('inc. size: $app.size', 1) } [inline] fn (mut app App) dec_size() { if app.size > 1 { app.size-- } app.show_msg('dec. size: $app.size', 1) } fn (mut app App) footer_click(event &tui.Event) { footer_y := 3 - (app.tui.window_height - event.y) match event.x { 8...11 { app.inc_size() } 12...15 { app.dec_size() } 18...75 { if (event.x % 3) == 0 { // Inside the gap between tiles return } idx := footer_y * 19 - 6 + event.x / 3 if idx < 0 || idx > 56 { return } color := colors[idx / 19][idx % 19] if event.button == .left { app.primary_color = color } else if event.button == .right { app.secondary_color = color } app.show_msg('set $event.button.str().to_lower() color idx: $idx', 1) } else {} } } fn (mut app App) show_msg(text string, time int) { frames := time * frame_rate app.msg_hide_tick = if time > 0 { int(app.tui.frame_count) + frames } else { -1 } app.msg = text }