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Merge pull request pyvec#53 from frenzymadness/autumn2019
[Ostrava] Add feedback for lesson about pyglet
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‎lessons/feedback/ostrava10/index.ipynb‎

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"# Feedback k domácím projektům"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"## Problém s proměnnými - lokální vs. globální, mutable vs. immutable"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"import pyglet\n",
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"from random import randint\n",
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"\n",
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"sirka = 1280\n",
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"vyska = 800\n",
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"rychlost_x = 0\n",
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"rychlost_y = 0\n",
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"\n",
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"window = pyglet.window.Window(sirka, vyska)\n",
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"\n",
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"obrazek = pyglet.image.load(\"ball.png\")\n",
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"sprite = pyglet.sprite.Sprite(obrazek)\n",
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"sprite.x = -100\n",
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"sprite.y = -100\n",
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"\n",
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"def tik(t):\n",
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" sprite.x = sprite.x + t * rychlost_x\n",
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" sprite.y = sprite.y + t * rychlost_y\n",
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" if sprite.x + obrazek.width > sirka or sprite.x < 0:\n",
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" rychlost_x = -rychlost_x\n",
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" if sprite.y + obrazek.height > vyska or sprite.y < 0:\n",
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" rychlost_y = -rychlost_y\n",
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"\n",
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"def klik(x, y, tlacitko, mod):\n",
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" sprite.x = x\n",
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" sprite.y = y\n",
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" rychlost_x = randint(-500, 500)\n",
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" rychlost_y = randint(-500, 500)\n",
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"\n",
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"def vykresli():\n",
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" window.clear()\n",
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" sprite.draw()\n",
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"\n",
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"pyglet.clock.schedule_interval(tik, 1/30)\n",
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"window.push_handlers(on_draw=vykresli, on_mouse_press=klik)\n",
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"\n",
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"pyglet.app.run()"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"Tento kód nefunguje, protože se uvnitř funkcí snažíme měnit obsah proměnných a zároveň přistupovat k jejich globálnímu stavu."
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"## Řešení 1 - kouzelný příkaz `global`"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"def tik(t):\n",
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" global rychlost_x, rychlost_y\n",
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" sprite.x = sprite.x + t * rychlost_x\n",
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" sprite.y = sprite.y + t * rychlost_y\n",
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" if sprite.x + obrazek.width > sirka or sprite.x < 0:\n",
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" rychlost_x = -rychlost_x\n",
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" if sprite.y + obrazek.height > vyska or sprite.y < 0:\n",
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" rychlost_y = -rychlost_y\n",
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"\n",
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"def klik(x, y, tlacitko, mod):\n",
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" global rychlost_x, rychlost_y\n",
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" sprite.x = x\n",
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" sprite.y = y\n",
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" rychlost_x = randint(-500, 500)\n",
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" rychlost_y = randint(-500, 500)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"## Řešení 2 - slovníky a seznamy"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"rychlost = {\"x\": 0, \"y\": 0}\n",
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"\n",
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"def tik(t):\n",
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" sprite.x = sprite.x + t * rychlost[\"x\"]\n",
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" sprite.y = sprite.y + t * rychlost[\"y\"]\n",
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" if sprite.x + obrazek.width > sirka or sprite.x < 0:\n",
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" rychlost[\"x\"] = -rychlost[\"x\"]\n",
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" if sprite.y + obrazek.height > vyska or sprite.y < 0:\n",
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" rychlost[\"y\"] = -rychlost[\"y\"]\n",
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"\n",
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"def klik(x, y, tlacitko, mod):\n",
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" sprite.x = x\n",
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" sprite.y = y\n",
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" rychlost[\"x\"] = randint(-500, 500)\n",
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" rychlost[\"y\"] = randint(-500, 500)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {
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"slideshow": {
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"slide_type": "slide"
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}
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},
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"source": [
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"## Řešení 3 - třída a objekty"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"import pyglet\n",
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"from random import randint\n",
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"\n",
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"sirka = 1280\n",
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"vyska = 800\n",
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"\n",
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"window = pyglet.window.Window(sirka, vyska)\n",
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"\n",
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"obrazek = pyglet.image.load(\"ball.png\")\n",
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"\n",
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"class Kulicka:\n",
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" def __init__(self, x, y):\n",
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" self.sprite = pyglet.sprite.Sprite(obrazek)\n",
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" self.sprite.x = x\n",
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" self.sprite.y = y\n",
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" self.rychlost_x = randint(-500, 500)\n",
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" self.rychlost_y = randint(-500, 500)\n",
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"\n",
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" def vykresli(self):\n",
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" self.sprite.draw()\n",
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" \n",
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" def tik(self, t):\n",
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" self.sprite.x = self.sprite.x + t * self.rychlost_x\n",
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" self.sprite.y = self.sprite.y + t * self.rychlost_y\n",
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" if self.sprite.x + obrazek.width > sirka or self.sprite.x < 0:\n",
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" self.rychlost_x = -self.rychlost_x\n",
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" if self.sprite.y + obrazek.height > vyska or self.sprite.y < 0:\n",
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" self.rychlost_y = -self.rychlost_y\n",
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"\n",
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"kulicky = []\n",
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"\n",
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"def tik(t):\n",
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" for kulicka in kulicky:\n",
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" kulicka.tik(t)\n",
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"\n",
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"def klik(x, y, tlacitko, mod):\n",
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" kulicky.append(Kulicka(x, y))\n",
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"\n",
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"def vykresli():\n",
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" window.clear()\n",
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" for kulicka in kulicky:\n",
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" kulicka.vykresli()\n",
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"\n",
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"pyglet.clock.schedule_interval(tik, 1/30)\n",
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"window.push_handlers(on_draw=vykresli, on_mouse_press=klik)\n",
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"\n",
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"pyglet.app.run()\n"
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]
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}
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],
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"metadata": {
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"celltoolbar": "Slideshow",
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.7.5"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}

‎lessons/feedback/ostrava10/info.yml‎

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title: Zpětná vazba k domácím projektům
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style: ipynb
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attribution: Pro PyLadies Ostrava napsal Lumír Balhar, 2019.
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license: cc-by-sa-40

‎runs/2019/pyladies-ostrava-podzim/info.yml‎

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- title: Tahák na Pyglet
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url: https://pyvec.github.io/cheatsheets/pyglet/pyglet-basics-cs.pdf
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type: cheatsheet
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- lesson: feedback/ostrava10
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type: lesson
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- title: Třídy
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slug: class
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date: 2019-11-13

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