From f5c4671bfbad96bf346bd7e9a21fc4317b4959df Mon Sep 17 00:00:00 2001
From: Indrajith K L
Date: Sat, 3 Dec 2022 17:00:20 +0530
Subject: Adds most of the tools

---
 v_windows/v/examples/term.ui/vyper.v | 475 +++++++++++++++++++++++++++++++++++
 1 file changed, 475 insertions(+)
 create mode 100644 v_windows/v/examples/term.ui/vyper.v

(limited to 'v_windows/v/examples/term.ui/vyper.v')

diff --git a/v_windows/v/examples/term.ui/vyper.v b/v_windows/v/examples/term.ui/vyper.v
new file mode 100644
index 0000000..cf41e60
--- /dev/null
+++ b/v_windows/v/examples/term.ui/vyper.v
@@ -0,0 +1,475 @@
+// import modules for use in app
+import term.ui as termui
+import rand
+
+// define some global constants
+const (
+	block_size = 1
+	buffer     = 10
+	green      = termui.Color{0, 255, 0}
+	grey       = termui.Color{150, 150, 150}
+	white      = termui.Color{255, 255, 255}
+	blue       = termui.Color{0, 0, 255}
+	red        = termui.Color{255, 0, 0}
+	black      = termui.Color{0, 0, 0}
+)
+
+// what edge of the screen are you facing
+enum Orientation {
+	top
+	right
+	bottom
+	left
+}
+
+// what's the current state of the game
+enum GameState {
+	pause
+	gameover
+	game
+	oob // snake out-of-bounds
+}
+
+// simple 2d vector representation
+struct Vec {
+mut:
+	x int
+	y int
+}
+
+// determine orientation from vector (hacky way to set facing from velocity)
+fn (v Vec) facing() Orientation {
+	result := if v.x >= 0 {
+		Orientation.right
+	} else if v.x < 0 {
+		Orientation.left
+	} else if v.y >= 0 {
+		Orientation.bottom
+	} else {
+		Orientation.top
+	}
+	return result
+}
+
+// generate a random vector with x in [min_x, max_x] and y in [min_y, max_y]
+fn (mut v Vec) randomize(min_x int, min_y int, max_x int, max_y int) {
+	v.x = rand.int_in_range(min_x, max_x)
+	v.y = rand.int_in_range(min_y, max_y)
+}
+
+// part of snake's body representation
+struct BodyPart {
+mut:
+	pos Vec = Vec{
+		x: block_size
+		y: block_size
+	}
+	color  termui.Color = green
+	facing Orientation  = .top
+}
+
+// snake representation
+struct Snake {
+mut:
+	app       &App
+	direction Orientation
+	body      []BodyPart
+	velocity  Vec = Vec{
+		x: 0
+		y: 0
+	}
+}
+
+// length returns the snake's current length
+fn (s Snake) length() int {
+	return s.body.len
+}
+
+// impulse provides a impulse to change the snake's direction
+fn (mut s Snake) impulse(direction Orientation) {
+	mut vec := Vec{}
+	match direction {
+		.top {
+			vec.x = 0
+			vec.y = -1 * block_size
+		}
+		.right {
+			vec.x = 2 * block_size
+			vec.y = 0
+		}
+		.bottom {
+			vec.x = 0
+			vec.y = block_size
+		}
+		.left {
+			vec.x = -2 * block_size
+			vec.y = 0
+		}
+	}
+	s.direction = direction
+	s.velocity = vec
+}
+
+// move performs the calculations for the snake's movements
+fn (mut s Snake) move() {
+	mut i := s.body.len - 1
+	width := s.app.width
+	height := s.app.height
+	// move the parts of the snake as appropriate
+	for i = s.body.len - 1; i >= 0; i-- {
+		mut piece := s.body[i]
+		if i > 0 { // just move the body of the snake up one position
+			piece.pos = s.body[i - 1].pos
+			piece.facing = s.body[i - 1].facing
+		} else { // verify that the move is valid and move the head if so
+			piece.facing = s.direction
+			new_x := piece.pos.x + s.velocity.x
+			new_y := piece.pos.y + s.velocity.y
+			piece.pos.x += if new_x > block_size && new_x < width - block_size {
+				s.velocity.x
+			} else {
+				0
+			}
+			piece.pos.y += if new_y > block_size && new_y < height - block_size {
+				s.velocity.y
+			} else {
+				0
+			}
+		}
+		s.body[i] = piece
+	}
+}
+
+// grow add another part to the snake when it catches the rat
+fn (mut s Snake) grow() {
+	head := s.get_tail()
+	mut pos := Vec{}
+	// add the segment on the opposite side of the previous tail
+	match head.facing {
+		.bottom {
+			pos.x = head.pos.x
+			pos.y = head.pos.y - block_size
+		}
+		.left {
+			pos.x = head.pos.x + block_size
+			pos.y = head.pos.y
+		}
+		.top {
+			pos.x = head.pos.x
+			pos.y = head.pos.y + block_size
+		}
+		.right {
+			pos.x = head.pos.x - block_size
+			pos.y = head.pos.y
+		}
+	}
+	s.body << BodyPart{
+		pos: pos
+		facing: head.facing
+	}
+}
+
+// get_body gets the parts of the snakes body
+fn (s Snake) get_body() []BodyPart {
+	return s.body
+}
+
+// get_head get snake's head
+fn (s Snake) get_head() BodyPart {
+	return s.body[0]
+}
+
+// get_tail get snake's tail
+fn (s Snake) get_tail() BodyPart {
+	return s.body[s.body.len - 1]
+}
+
+// randomize randomizes position and veolcity of snake
+fn (mut s Snake) randomize() {
+	speeds := [-2, 0, 2]
+	mut pos := s.get_head().pos
+	pos.randomize(buffer, buffer, s.app.width - buffer, s.app.height - buffer)
+	for pos.x % 2 != 0 || (pos.x < buffer && pos.x > s.app.width - buffer) {
+		pos.randomize(buffer, buffer, s.app.width - buffer, s.app.height - buffer)
+	}
+	s.velocity.y = rand.int_in_range(-1 * block_size, block_size)
+	s.velocity.x = speeds[rand.intn(speeds.len)]
+	s.direction = s.velocity.facing()
+	s.body[0].pos = pos
+}
+
+// check_overlap determine if the snake's looped onto itself
+fn (s Snake) check_overlap() bool {
+	h := s.get_head()
+	head_pos := h.pos
+	for i in 2 .. s.length() {
+		piece_pos := s.body[i].pos
+		if head_pos.x == piece_pos.x && head_pos.y == piece_pos.y {
+			return true
+		}
+	}
+	return false
+}
+
+fn (s Snake) check_out_of_bounds() bool {
+	h := s.get_head()
+	return h.pos.x + s.velocity.x <= block_size
+		|| h.pos.x + s.velocity.x > s.app.width - s.velocity.x
+		|| h.pos.y + s.velocity.y <= block_size
+		|| h.pos.y + s.velocity.y > s.app.height - block_size - s.velocity.y
+}
+
+// draw draws the parts of the snake
+fn (s Snake) draw() {
+	mut a := s.app
+	for part in s.get_body() {
+		a.termui.set_bg_color(part.color)
+		a.termui.draw_rect(part.pos.x, part.pos.y, part.pos.x + block_size, part.pos.y + block_size)
+		$if verbose ? {
+			text := match part.facing {
+				.top { '^' }
+				.bottom { 'v' }
+				.right { '>' }
+				.left { '<' }
+			}
+			a.termui.set_color(white)
+			a.termui.draw_text(part.pos.x, part.pos.y, text)
+		}
+	}
+}
+
+// rat representation
+struct Rat {
+mut:
+	pos Vec = Vec{
+		x: block_size
+		y: block_size
+	}
+	captured bool
+	color    termui.Color = grey
+	app      &App
+}
+
+// randomize spawn the rat in a new spot within the playable field
+fn (mut r Rat) randomize() {
+	r.pos.randomize(2 * block_size + buffer, 2 * block_size + buffer, r.app.width - block_size - buffer,
+		r.app.height - block_size - buffer)
+}
+
+[heap]
+struct App {
+mut:
+	termui &termui.Context = 0
+	snake  Snake
+	rat    Rat
+	width  int
+	height int
+	redraw bool      = true
+	state  GameState = .game
+}
+
+// new_game setups the rat and snake for play
+fn (mut a App) new_game() {
+	mut snake := Snake{
+		body: []BodyPart{len: 1, init: BodyPart{}}
+		app: a
+	}
+	snake.randomize()
+	mut rat := Rat{
+		app: a
+	}
+	rat.randomize()
+	a.snake = snake
+	a.rat = rat
+	a.state = .game
+	a.redraw = true
+}
+
+// initialize the app and record the width and height of the window
+fn init(x voidptr) {
+	mut app := &App(x)
+	w, h := app.termui.window_width, app.termui.window_height
+	app.width = w
+	app.height = h
+	app.new_game()
+}
+
+// event handles different events for the app as they occur
+fn event(e &termui.Event, x voidptr) {
+	mut app := &App(x)
+	match e.typ {
+		.mouse_down {}
+		.mouse_drag {}
+		.mouse_up {}
+		.key_down {
+			match e.code {
+				.up, .w { app.move_snake(.top) }
+				.down, .s { app.move_snake(.bottom) }
+				.left, .a { app.move_snake(.left) }
+				.right, .d { app.move_snake(.right) }
+				.r { app.new_game() }
+				.c {}
+				.p { app.state = if app.state == .game { GameState.pause } else { GameState.game } }
+				.escape, .q { exit(0) }
+				else { exit(0) }
+			}
+			if e.code == .c {
+			} else if e.code == .escape {
+				exit(0)
+			}
+		}
+		else {}
+	}
+	app.redraw = true
+}
+
+// frame perform actions on every tick
+fn frame(x voidptr) {
+	mut app := &App(x)
+	app.update()
+	app.draw()
+}
+
+// update perform any calculations that are needed before drawing
+fn (mut a App) update() {
+	if a.state == .game {
+		a.snake.move()
+		if a.snake.check_out_of_bounds() {
+			$if verbose ? {
+				a.snake.body[0].color = red
+			} $else {
+				a.state = .oob
+			}
+		}
+		if a.snake.check_overlap() {
+			a.state = .gameover
+			return
+		}
+		if a.check_capture() {
+			a.rat.randomize()
+			a.snake.grow()
+		}
+	}
+}
+
+// draw write to the screen
+fn (mut a App) draw() {
+	// reset screen
+	a.termui.clear()
+	a.termui.set_bg_color(white)
+	a.termui.draw_empty_rect(1, 1, a.width, a.height)
+	// determine if a special screen needs to be draw
+	match a.state {
+		.gameover {
+			a.draw_gameover()
+			a.redraw = false
+		}
+		.pause {
+			a.draw_pause()
+		}
+		else {
+			a.redraw = true
+		}
+	}
+	a.termui.set_color(blue)
+	a.termui.set_bg_color(white)
+	a.termui.draw_text(3 * block_size, a.height - (2 * block_size), 'p - (un)pause r - reset q - quit')
+	// draw the snake, rat, and score if appropriate
+	if a.redraw {
+		a.termui.set_bg_color(black)
+		a.draw_gamescreen()
+		if a.state == .oob {
+			a.state = .gameover
+		}
+	}
+	// write to the screen
+	a.termui.reset_bg_color()
+	a.termui.flush()
+}
+
+// move_snake move the snake in specified direction
+fn (mut a App) move_snake(direction Orientation) {
+	a.snake.impulse(direction)
+}
+
+// check_capture determine if the snake overlaps with the rat
+fn (a App) check_capture() bool {
+	snake_pos := a.snake.get_head().pos
+	rat_pos := a.rat.pos
+	return snake_pos.x <= rat_pos.x + block_size && snake_pos.x + block_size >= rat_pos.x
+		&& snake_pos.y <= rat_pos.y + block_size && snake_pos.y + block_size >= rat_pos.y
+}
+
+fn (mut a App) draw_snake() {
+	a.snake.draw()
+}
+
+fn (mut a App) draw_rat() {
+	a.termui.set_bg_color(a.rat.color)
+	a.termui.draw_rect(a.rat.pos.x, a.rat.pos.y, a.rat.pos.x + block_size, a.rat.pos.y + block_size)
+}
+
+fn (mut a App) draw_gamescreen() {
+	$if verbose ? {
+		a.draw_debug()
+	}
+	a.draw_score()
+	a.draw_rat()
+	a.draw_snake()
+}
+
+fn (mut a App) draw_score() {
+	a.termui.set_color(blue)
+	a.termui.set_bg_color(white)
+	score := a.snake.length() - 1
+	a.termui.draw_text(a.width - (2 * block_size), block_size, '${score:03d}')
+}
+
+fn (mut a App) draw_pause() {
+	a.termui.set_color(blue)
+	a.termui.draw_text((a.width / 2) - block_size, 3 * block_size, 'Paused!')
+}
+
+fn (mut a App) draw_debug() {
+	a.termui.set_color(blue)
+	a.termui.set_bg_color(white)
+	snake := a.snake
+	a.termui.draw_text(block_size, 1 * block_size, 'Display_width: ${a.width:04d} Display_height: ${a.height:04d}')
+	a.termui.draw_text(block_size, 2 * block_size, 'Vx: ${snake.velocity.x:+02d} Vy: ${snake.velocity.y:+02d}')
+	a.termui.draw_text(block_size, 3 * block_size, 'F: $snake.direction')
+	snake_head := snake.get_head()
+	rat := a.rat
+	a.termui.draw_text(block_size, 4 * block_size, 'Sx: ${snake_head.pos.x:+03d} Sy: ${snake_head.pos.y:+03d}')
+	a.termui.draw_text(block_size, 5 * block_size, 'Rx: ${rat.pos.x:+03d} Ry: ${rat.pos.y:+03d}')
+}
+
+fn (mut a App) draw_gameover() {
+	a.termui.set_bg_color(white)
+	a.termui.set_color(red)
+	a.rat.pos = Vec{
+		x: -1
+		y: -1
+	}
+	x_offset := '   #####                        '.len // take half of a line from the game over text and store the length
+	start_x := (a.width / 2) - x_offset
+	a.termui.draw_text(start_x, (a.height / 2) - 3 * block_size, '   #####                         #######                       ')
+	a.termui.draw_text(start_x, (a.height / 2) - 2 * block_size, '  #     #   ##   #    # ######   #     # #    # ###### #####   ')
+	a.termui.draw_text(start_x, (a.height / 2) - 1 * block_size, '  #        #  #  ##  ## #        #     # #    # #      #    #  ')
+	a.termui.draw_text(start_x, (a.height / 2) - 0 * block_size, '  #  #### #    # # ## # #####    #     # #    # #####  #    #  ')
+	a.termui.draw_text(start_x, (a.height / 2) + 1 * block_size, '  #     # ###### #    # #        #     # #    # #      #####   ')
+	a.termui.draw_text(start_x, (a.height / 2) + 2 * block_size, '  #     # #    # #    # #        #     #  #  #  #      #   #   ')
+	a.termui.draw_text(start_x, (a.height / 2) + 3 * block_size, '   #####  #    # #    # ######   #######   ##   ###### #    #  ')
+}
+
+fn main() {
+	mut app := &App{}
+	app.termui = termui.init(
+		user_data: app
+		event_fn: event
+		frame_fn: frame
+		init_fn: init
+		hide_cursor: true
+		frame_rate: 10
+	)
+	app.termui.run() ?
+}
-- 
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