433 aspect ratio check

app/main/check_packs/pack_config.py

@@ -22,6 +22,7 @@
     ['pres_image_capture'],
     ['task_tracker'],
     ['overview_in_tasks'],
+    ['pres_aspect_ratio_check'],
 ]
 BASE_REPORT_CRITERION = [
     ["simple_check"],

app/main/checks/presentation_checks/__init__.py

@@ -6,4 +6,4 @@
     module_globals=globals(),
     base_class=BaseCriterion,
     current_file=__file__
-)
+)

app/main/checks/presentation_checks/aspect_ratio_check.py

@@ -0,0 +1,74 @@
+import math
+
+from ..base_check import BasePresCriterion, answer
+
+
+class Ratio:
+    ASCPECT_RATIO_PRECISION = 2
+
+    def __init__(self, width, height):
+        self.width = width
+        self.height = height
+        if height == 0:
+            self.value = 0
+        else:
+            self.value = round(width / height, self.ASCPECT_RATIO_PRECISION)
+
+    def __eq__(self, other):
+        return self.value == other.value
+
+    def __hash__(self):
+        return hash(self.value)
+
+    def __str__(self):
+        gcd_value = math.gcd(self.width, self.height)
+        if gcd_value == 0:
+            return "0:0"
+        simplified_width = self.width // gcd_value
+        simplified_height = self.height // gcd_value
+        return f"{simplified_width}:{simplified_height}"
+
+
+class PresAspectRatioCheck(BasePresCriterion):
+    label = "Проверка соотношения сторон слайда"
+    id = "pres_aspect_ratio_check"
+
+    def __init__(self, file_info, correct_ratios=("16:9", "4:3")):
+        super().__init__(file_info)
+        self.correct_ratios = set(
+            Ratio(*map(int, x.split(":"))) for x in correct_ratios
+        )
+
+    def __is_correct_ratio(self, aspect_ratio: Ratio):
+        return aspect_ratio in self.correct_ratios
+
+    def __convert_size_to_pixels(self, size, dpi=96):
+        return math.trunc(size.inches * dpi)
+
+    def __get_correct_instruction(self, aspect_ratio):
+        correct_ratios_str = ", ".join(map(str, self.correct_ratios))
+        width = self.__convert_size_to_pixels(aspect_ratio.width)
+        height = self.__convert_size_to_pixels(aspect_ratio.height)
+        return (
+            f"Соотношение сторон слайдов ({width}x{
+                height
+            }) не соответствует стандарту<br/>"
+            "Рекомендации по исправлению:<br/>"
+            f"Измените соотношение сторон презентации на одно из доступных ({
+                correct_ratios_str
+            })"
+        )
+
+    def check(self):
+        width = self.file.prs.slide_width
+        height = self.file.prs.slide_height
+
+        aspect_ratio = Ratio(width, height)
+
+        if self.__is_correct_ratio(aspect_ratio):
+            return answer(
+                True,
+                f"Соотношение сторон слайдов ({aspect_ratio}) соответствует стандарту.",
+            )
+
+        return answer(False, self.__get_correct_instruction(aspect_ratio))