Prg2/space (applying design patterns) - ประวัติรุ่นแก้ไข

Jittat: /* Additional improvements (optional) */

2021-03-25T03:42:01Z

Additional improvements (optional)

2021-03-25T03:20:10Z

Interval update

2021-03-25T03:19:42Z

Additional improvements (optional)

2021-03-25T03:16:36Z

Additional improvements

2021-03-25T03:12:22Z

Bombs

2021-03-25T03:07:46Z

Levels (optional)

2021-03-25T03:04:04Z

The Strategy Pattern

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Status display

2021-03-25T02:51:02Z

Status display

2021-03-25T02:50:10Z

Status display

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	== Additional improvements (optional) ==		== Additional improvements (optional) ==
		+
		+	=== Lifes & restarts ===
		+
		+	You might not want to die instantly. You might want to restart the game.

	=== Rotating ship ===		=== Rotating ship ===

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	</syntaxhighlight>		</syntaxhighlight>

−	Find a way to integrate this wait into the traditional update loop in <tt>update</tt> method.	+	Find a way to integrate this wait nicely into the traditional update loop in <tt>update</tt> method.

@@ แถว 522: / แถว 522: @@
 You might want to use a nicer ship image, but you need to rotate the image so that you can see the ship direction.  To do so, you need to install [https://pillow.readthedocs.io/en/stable/ Pillow] (a PIL fork for Python 3), and use <tt>PIL.ImageTk.PhotoImage</tt> instead of <tt>tk.PhotoImage</tt>.
-You can follow the answer in [https://stackoverflow.com/questions/15736530/python-tkinter-rotate-image-animation] or [https://www.homeandlearn.uk/python-third-party-library-use.html]
+You can follow the answer in [https://stackoverflow.com/questions/15736530/python-tkinter-rotate-image-animation] or a tutorial in [https://www.homeandlearn.uk/python-third-party-library-use.html].  You can just replace <tt>PIL</tt> with <tt>Pillow</tt>.
 === Interval update ===

←รุ่นแก้ไขก่อนหน้า		รุ่นแก้ไขเมื่อ 03:16, 25 มีนาคม 2564
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	You can adjust the probabilities. It would be very fun to add more <tt>EnemyGenerateionStrategy</tt>'s. For example, you may want to add special bullets that move slowing toward the Ship.		You can adjust the probabilities. It would be very fun to add more <tt>EnemyGenerateionStrategy</tt>'s. For example, you may want to add special bullets that move slowing toward the Ship.

−	== Additional improvements ==	+	== Additional improvements (optional) ==
		+
		+	=== Rotating ship ===
		+
		+	You might want to use a nicer ship image, but you need to rotate the image so that you can see the ship direction. To do so, you need to install [https://pillow.readthedocs.io/en/stable/ Pillow] (a PIL fork for Python 3), and use <tt>PIL.ImageTk.PhotoImage</tt> instead of <tt>tk.PhotoImage</tt>.
		+
		+	You can follow the answer in [https://stackoverflow.com/questions/15736530/python-tkinter-rotate-image-animation] or [https://www.homeandlearn.uk/python-third-party-library-use.html]
		+
		+	=== Interval update ===

←รุ่นแก้ไขก่อนหน้า		รุ่นแก้ไขเมื่อ 03:12, 25 มีนาคม 2564
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	== Bombs ==		== Bombs ==
		+
		+	Currently implementation of bomb is essentially insider method <tt>bomb</tt>. The code below shows the original implementation before the usage of <tt>StatusWithText</tt>.
		+
		+	<syntaxhighlight lang="python">
		+	def bomb(self):
		+	if self.bomb_power == BOMB_FULL_POWER:
		+	self.bomb_power = 0
		+
		+	self.bomb_canvas_id = self.canvas.create_oval(
		+	self.ship.x - BOMB_RADIUS,
		+	self.ship.y - BOMB_RADIUS,
		+	self.ship.x + BOMB_RADIUS,
		+	self.ship.y + BOMB_RADIUS
		+	)
		+
		+	self.after(200, lambda: self.canvas.delete(self.bomb_canvas_id))
		+
		+	for e in self.enemies:
		+	if self.ship.distance_to(e) <= BOMB_RADIUS:
		+	e.to_be_deleted = True
		+
		+	self.update_bomb_power_text()
		+	</syntaxhighlight>
		+
		+	'''Your Task:''' This is a open-ended task. Find a way to improve the code in this part. Possible approaches are:
		+
		+	* Extract the enemy destroying loop into a function.
		+	* Extract the circle drawing code
		+	* Try to hide access to <tt>self.after</tt>
		+	* Create special canvas objects that disappear over time.

	== Levels (optional) ==		== Levels (optional) ==

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	== Levels (optional) ==		== Levels (optional) ==
		+
		+	You can change the game levels. You can update <tt>self.level</tt> in either method <tt>update_score</tt> or some additional method. To make the game more challenging, you can play with <tt>self.enemy_creation_strategies</tt>. Currently, we set
		+
		+	<syntaxhighlight lang="python">
		+	self.enemy_creation_strategies = [
		+	(0.2, StarEnemyGenerationStrategy()),
		+	(1.0, EdgeEnemyGenerationStrategy())
		+	]
		+	</syntaxhighlight>
		+
		+	You can adjust the probabilities. It would be very fun to add more <tt>EnemyGenerateionStrategy</tt>'s. For example, you may want to add special bullets that move slowing toward the Ship.

	== Additional improvements ==		== Additional improvements ==

@@ แถว 235: / แถว 235: @@
 ''Note that we use ABC (abstract base class, see [https://docs.python.org/3/glossary.html#term-abstract-base-class]) to fully enforce the new implementation of <tt>generate</tt> method.''
-The two methods should be extracted into the following classes:
+The two methods should be extracted into the following classes.  '''Your task:''' extract the following code.  Pay attention to references to <tt>self</tt>.  Don't forget to change them.
 <syntaxhighlight lang="python">
 class StarEnemyGenerationStrategy(EnemyGenerationStrategy):

@@ แถว 435: / แถว 435: @@
 </syntaxhighlight>
-This StatusWithText has property <tt>value</tt> that we can read and write (through its <tt>setter</tt>).  The value is shown on <tt>self.label_text</tt> using the provided template (e.g., <tt>'Score: %d'</tt>).
+This StatusWithText has property <tt>value</tt> that we can read and write (through its <tt>setter</tt>).  The value is shown on <tt>self.label_text</tt> using the provided template (e.g., <tt>'Score: %d'</tt>).  Please try to read the code to see how it works.
 == Bombs ==

←รุ่นแก้ไขก่อนหน้า		รุ่นแก้ไขเมื่อ 02:50, 25 มีนาคม 2564
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	== Status display ==		== Status display ==
		+	We would encapsulate the text for displaying status with the value of the status itself. We shall create a '''StatusWithText''' class. The object <tt>StatusWithText</tt> keeps the status value and the canvas's text, and update the text automatically when the value is updated. We shall use Python's magic: '''property''' to make our code looks nice.
		+
		+	'''Be careful!''' Everytime you use some magic, recall that it might bite you at your back!!!
		+
		+	<syntaxhighlight lang="python">
		+	class StatusWithText:
		+	def __init__(self, app, x, y, text_template, default_value=0):
		+	self.x = x
		+	self.y = y
		+	self.text_template = text_template
		+	self._value = default_value
		+	self.label_text = Text(app, '', x, y)
		+	self.update_label()
		+
		+	@property
		+	def value(self):
		+	return self._value
		+
		+	@value.setter
		+	def value(self, v):
		+	self._value = v
		+	self.update_label()
		+
		+	def update_label(self):
		+	self.label_text.set_text(self.text_template % self.value)
		+	</syntaxhighlight>
		+
		+	This StatusWithText has property <tt>value</tt> that we can read and write (through its <tt>setter</tt>).

	== Bombs ==		== Bombs ==