PyTexas Meetup 02/06/2024 Demo

README.md

This demo requires a font file, replace "B612-Regular.ttf" with the font file you have in the same folder.

main.py

from __future__ import annotations
import dataclasses

import ppb
import ppb.keycodes
import ppb.systemslib

font = ppb.Font("B612-Regular.ttf", size=120)


class ScoringSystem(ppb.systemslib.System):
    score = 0
    high_score = 0

    def __init__(self, *, engine: ppb.GameEngine, **kwargs):
        super().__init__(engine=engine, **kwargs)
        engine.register(ppb.events.PreRender, self.add_scores)

    def on_scene_started(self, event: ppb.events.SceneStarted, signal: ppb.Signal):
        if isinstance(event.scene, Game):
            self.score = 0

    def on_scored(self, event: Scored, signal: ppb.Signal):
        self.score += event.value
        if self.score > self.high_score:
            self.high_score = self.score

    def add_scores(self, event):
        event.score = self.score
        event.high_score = self.high_score


@dataclasses.dataclass
class Scored:
    value: int
    scene: ppb.Scene = None


@dataclasses.dataclass
class ScoredPreRender:
    time_delta: float
    scene: ppb.Scene
    score: int
    high_score: int


class Player(ppb.Sprite):
    image = ppb.Triangle(150, 200, 80)
    position = ppb.Vector(0, -8)
    intent = ppb.Vector(0, 0)
    speed = 5
    # image = ppb.Image("player.png")

    def on_update(self, event: ppb.events.Update, signal: ppb.Signal):
        if self.intent:
            self.position += self.intent * self.speed * event.time_delta

    def on_key_pressed(self, event: ppb.events.KeyPressed, signal: ppb.Signal):
        if event.key is ppb.keycodes.A:
            self.intent += ppb.directions.Left
        elif event.key is ppb.keycodes.D:
            self.intent += ppb.directions.Right
        elif event.key is ppb.keycodes.Space:
            event.scene.add(Bullet(position=self.top_middle), tags=["player_bullets"])

    def on_key_released(self, event: ppb.events.KeyReleased, signal: ppb.Signal):
        if event.key is ppb.keycodes.A:
            self.intent -= ppb.directions.Left
        elif event.key is ppb.keycodes.D:
            self.intent -= ppb.directions.Right


class Target(ppb.Sprite):
    image = ppb.Circle(200, 20, 60)


class Bullet(ppb.Sprite):
    image = ppb.Triangle(150, 190, 220)
    size = 0.35
    intent = ppb.directions.Up
    speed = 10

    def on_update(self, event: ppb.events.Update, signal: ppb.Signal):
        if self.intent:
            self.position += self.intent * self.speed * event.time_delta

        for target in event.scene.get(kind=Target):
            delta: ppb.Vector = target.position - self.position
            distance = delta.length
            combined_radii = (self.size + target.size) / 2
            if distance <= combined_radii:
                event.scene.remove(self)
                event.scene.remove(target)
                signal(Scored(10))
                break


class ScorePanel(ppb.Sprite):
    layer = 100
    color = (200, 200, 200)
    text_template = "Score: {score}"

    def on_pre_render(self, event: ScoredPreRender, signal: ppb.Signal):
        context = {
            "score": event.score,
            "high_score": event.high_score
        }

        self.image = ppb.Text(self.text_template.format(**context), font=font, color=self.color)


class Game(ppb.Scene):
    background_color = (25, 25, 25)

    def on_update(self, event: ppb.events.Update, signal: ppb.Signal):
        if not any(self.get(kind=Target)):
            signal(ppb.events.StopScene())


class Title(ppb.Scene):
    background_color = (161, 102, 204)

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.add(
            ppb.Sprite(
                image=ppb.Text("Our Cool Game", font=font, color=(25, 75, 25)),
                size=3,
                position=ppb.Vector(0, 6)
            )
        )
        self.add(ScorePanel(text_template="High Score: {high_score}", color=(25, 75, 25)))

    def on_key_released(self, event: ppb.events.KeyReleased, signal: ppb.Signal):
        signal(ppb.events.StartScene(Game, {"set_up": setup}))


def setup(scene: ppb.Scene):
    scene.add(Player())
    for x in range(-10, 11, 6):
        scene.add(Target(position=ppb.Vector(x, 7)))
    scene.add(ScorePanel(position=ppb.Vector(-10.5, 8.5), size=0.75))
    scene.add(ScorePanel(text_template="High Score: {high_score}", position=ppb.Vector(9, 8.5), size=0.75))


ppb.run(starting_scene=Title, systems=[ScoringSystem])