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example_graph_code.py

+from kivy.app import App
+from kivy.uix.image import Image
+from kivy.graphics.texture import Texture
+from kivy.uix.screenmanager import Screen, ScreenManager
+from kivy.lang import Builder
+
+import matplotlib.pyplot as plt
+from matplotlib.backends.backend_agg import FigureCanvasAgg
+
+import pandas as pd
+from io import BytesIO
+from PIL import Image as PILImage
+
+
+class GraphScreen(Screen):
+
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+        self.graph_texture = None
+
+    def on_enter(self):
+        # Sample CoinGecko-style data
+        data = {
+            "prices": [
+                [1711843200000, 69702.31],
+                [1711929600000, 71246.95],
+                [1711983682000, 68887.75]
+            ]
+        }
+
+        df = pd.DataFrame(data["prices"], columns=["timestamp", "price"])
+        df["timestamp"] = pd.to_datetime(df["timestamp"], unit="ms")
+
+        # Plot
+        fig, ax = plt.subplots()
+        ax.plot(df["timestamp"], df["price"], label="Price", color="green")
+        ax.set_title("Price Over Time")
+        ax.set_xlabel("Date")
+        ax.set_ylabel("Price (USD)")
+        ax.legend()
+
+        # Convert plot to Kivy texture
+        canvas = FigureCanvasAgg(fig)
+        canvas.draw()
+        buf = BytesIO()
+        fig.savefig(buf, format='png')
+        buf.seek(0)
+
+        pil_image = PILImage.open(buf).transpose(PILImage.FLIP_TOP_BOTTOM)
+        tex = Texture.create(size=pil_image.size, colorfmt='rgba')
+        tex.blit_buffer(pil_image.convert('RGBA').tobytes(), colorfmt='rgba', bufferfmt='ubyte')
+        tex.flip_vertical()
+
+        # Access the image widget via ids correctly
+        self.graph_texture = tex
+
+
+class MyApp(App):
+    def build(self):
+        return Builder.load_file('example_graph_code.kv')
+
+if __name__ == "__main__":
+    app = MyApp()
+    app.run()
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