From a309ace0987695f0d692b52f639824c84cf8db15 Mon Sep 17 00:00:00 2001
From: Keon Hyouk <khkoh5932@naver.com>
Date: Sat, 9 Dec 2023 21:00:13 +0900
Subject: [PATCH] Gradation class

---
 src/PIL/ImageGradation.py | 89 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 src/PIL/ImageGradation.py

diff --git a/src/PIL/ImageGradation.py b/src/PIL/ImageGradation.py
new file mode 100644
index 000000000..17b8b0917
--- /dev/null
+++ b/src/PIL/ImageGradation.py
@@ -0,0 +1,89 @@
+import math   
+import Image, ImageDraw,ImageFilter
+
+class Gradation(ImageFilter):
+
+    name ="Gradation"
+
+    def __init__(self,start_color,end_color,grad_dir='row'):
+        self.grad1=start_color
+        self.grad2=end_color
+        self.shape=grad_dir
+
+    def apply_gradation_filter(self,image):
+        # 그라데이션 필터 적용
+        width, height = image.size
+
+        if self.shape == 'row' or self.shape == 'col':
+            grad_image = self.visual_gradation(width, height)
+        elif self.shape == 'circular':
+            grad_image = self.circular_gradation(width, height, self.grad1, self.grad2)
+        else:
+            raise ValueError("Invalid shape. Use 'row', 'col', or 'circular'.")
+
+        # 원본 이미지와 그라데이션 이미지를 합침
+        blended_image = Image.blend(image.convert('RGB'), grad_image, 0.5)
+        blended_image = blended_image.convert('RGB')
+
+        return blended_image
+
+    def visual_gradation(self,width, height):
+        image = Image.new("RGB", (width, height))
+        # 이미지 Draw 객체 생성
+
+        draw = ImageDraw.Draw(image)
+
+        if self.shape == 'col':
+            for x in range(width):
+                # 색상 그라데이션 계산
+                red = int(self.grad1[0] * (1.0 - x / width) + self.grad2[0] * (x / width))
+                green = int(self.grad1[1] * (1.0 - x / width) + self.grad2[1] * (x / width))
+                blue = int(self.grad1[2] * (1.0 - x / width) + self.grad2[2] * (x / width))
+
+                # 현재 열에 대한 선 그리기
+                draw.line([(x, 0), (x, height)], fill=(red, green, blue))
+        elif self.shape == 'row':
+            for y in range(height):
+                # 색상 그라데이션 계산
+                red = int(self.grad1[0] * (1.0 - y / height) + self.grad2[0] * (y / height))
+                green = int(self.grad1[1] * (1.0 - y / height) + self.grad2[1] * (y / height))
+                blue = int(self.grad1[2] * (1.0 - y / height) + self.grad2[2] * (y / height))
+
+                # 현재 열에 대한 선 그리기
+                draw.line([(0, y), (width, y)], fill=(red, green, blue))
+        else:
+            raise ValueError("Invalid shape. Use 'row' or 'col'.")
+        
+        return image
+
+    def circular_gradation(self,width, height):
+
+        # 새로운 이미지 생성
+        image = Image.new("RGB", (width, height))
+
+        # 이미지 Draw 객체 생성
+        draw = ImageDraw.Draw(image)
+
+        # 중심 좌표 및 반지름 계산
+        center_x, center_y = width // 2, height // 2
+        radius = min(center_x, center_y)
+
+        # 원형 그라데이션 값 적용
+        for y in range(height):
+            for x in range(width):
+                # 현재 좌표에서 중심 좌표까지의 거리 계산
+                distance = math.sqrt((x - center_x)**2 + (y - center_y)**2)
+
+                # 반지름보다 크면 거리를 반지름으로 설정
+                distance = min(distance, radius)
+
+                # 거리에 따른 색상 계산
+                ratio = distance / radius
+                r = int(self.grad1[0] * (1.0 - ratio) + self.grad2[0] * ratio)
+                g = int(self.grad1[1] * (1.0 - ratio) + self.grad2[1] * ratio)
+                b = int(self.grad1[2] * (1.0 - ratio) + self.grad2[2] * ratio)
+
+                # 현재 좌표에 색상 설정
+                draw.point((x, y), fill=(r, g, b))
+
+        return image
\ No newline at end of file