Improve barplots (#48)

* Improved barplots

* Formatting

Added Gantt chart

Support tikz

Author: max-models

examples/gantt_matplotlib.py

@@ -0,0 +1,50 @@
+import numpy as np
+
+from maxplotlib import Canvas
+
+
+def main() -> None:
+    # Define project tasks
+    tasks = [
+        "Planning",
+        "Design",
+        "Development",
+        "Testing",
+        "Deployment",
+        "Documentation",
+    ]
+    
+    # Start times (in days from project start)
+    start_times = np.array([0, 5, 10, 25, 35, 30])
+    
+    # Duration of each task (in days)
+    durations = np.array([5, 5, 15, 10, 5, 10])
+    
+    # Create canvas
+    canvas = Canvas(width="14cm", ratio=0.6, dpi=150)
+    
+    # Add gantt chart
+    canvas.gantt(
+        tasks=tasks,
+        start_times=start_times,
+        durations=durations,
+        color="steelblue",
+        alpha=0.7,
+        edgecolor="black",
+        label="Project Tasks"
+    )
+    
+    # Configure plot
+    canvas.set_title("Project Timeline - Gantt Chart")
+    canvas.set_xlabel("Days from Project Start")
+    canvas.set_ylabel("Tasks")
+    canvas.set_grid(True)
+    canvas.set_xlim(0, 45)
+    
+    # Save figure
+    canvas.savefig("gantt_matplotlib.png", backend="matplotlib")
+    print("Gantt chart saved as gantt_matplotlib.png")
+
+
+if __name__ == "__main__":
+    main()

examples/gantt_plotext.py

@@ -0,0 +1,48 @@
+import numpy as np
+
+from maxplotlib import Canvas
+
+
+def main() -> None:
+    # Define project tasks
+    tasks = [
+        "Planning",
+        "Design",
+        "Development",
+        "Testing",
+        "Deployment",
+        "Documentation",
+    ]
+    
+    # Start times (in days from project start)
+    start_times = np.array([0, 5, 10, 25, 35, 30])
+    
+    # Duration of each task (in days)
+    durations = np.array([5, 5, 15, 10, 5, 10])
+    
+    # Create canvas
+    canvas = Canvas(width="14cm", ratio=0.6)
+    
+    # Add gantt chart
+    canvas.gantt(
+        tasks=tasks,
+        start_times=start_times,
+        durations=durations,
+        color="cyan",
+        label="Project Tasks"
+    )
+    
+    # Configure plot
+    canvas.set_title("Project Timeline - Gantt Chart (Plotext)")
+    canvas.set_xlabel("Days from Project Start")
+    canvas.set_ylabel("Tasks")
+    canvas.set_grid(True)
+    canvas.set_xlim(0, 45)
+    
+    # Save figure (plotext renders to terminal)
+    canvas.savefig("gantt_plotext.txt", backend="plotext")
+    print("Gantt chart saved as gantt_plotext.txt")
+
+
+if __name__ == "__main__":
+    main()

examples/gantt_plotly.py

@@ -0,0 +1,49 @@
+import numpy as np
+
+from maxplotlib import Canvas
+
+
+def main() -> None:
+    # Define project tasks
+    tasks = [
+        "Planning",
+        "Design",
+        "Development",
+        "Testing",
+        "Deployment",
+        "Documentation",
+    ]
+    
+    # Start times (in days from project start)
+    start_times = np.array([0, 5, 10, 25, 35, 30])
+    
+    # Duration of each task (in days)
+    durations = np.array([5, 5, 15, 10, 5, 10])
+    
+    # Create canvas
+    canvas = Canvas(width="14cm", ratio=0.6)
+    
+    # Add gantt chart
+    canvas.gantt(
+        tasks=tasks,
+        start_times=start_times,
+        durations=durations,
+        color="steelblue",
+        alpha=0.7,
+        label="Project Tasks"
+    )
+    
+    # Configure plot
+    canvas.set_title("Project Timeline - Gantt Chart (Plotly)")
+    canvas.set_xlabel("Days from Project Start")
+    canvas.set_ylabel("Tasks")
+    canvas.set_grid(True)
+    canvas.set_xlim(0, 45)
+    
+    # Save figure
+    canvas.savefig("gantt_plotly.html", backend="plotly")
+    print("Gantt chart saved as gantt_plotly.html")
+
+
+if __name__ == "__main__":
+    main()

src/maxplotlib/canvas/canvas.py

@@ -430,6 +430,30 @@ def bar(
         sp = self._get_or_create_subplot(row, col)
         sp.bar(x, height, layer=layer, **kwargs)
 
+    def gantt(
+        self,
+        tasks,
+        start_times,
+        durations,
+        layer=0,
+        row: int | None = None,
+        col: int | None = None,
+        **kwargs,
+    ):
+        """
+        Add a Gantt chart to the canvas (matplotlib-style convenience method).
+
+        Parameters:
+        tasks (array-like): Task names or labels (y-axis).
+        start_times (array-like): Start times for each task (x-axis).
+        durations (array-like): Duration of each task.
+        layer (int): Layer index (default 0).
+        row, col (int): Subplot position (default top-left).
+        **kwargs: Forwarded to the backend (e.g., color, alpha, edgecolor, label).
+        """
+        sp = self._get_or_create_subplot(row, col)
+        sp.gantt(tasks, start_times, durations, layer=layer, **kwargs)
+
     def set_xlabel(self, label: str, row: int | None = None, col: int | None = None):
         """Set the x-axis label for a subplot (default top-left)."""
         self._get_or_create_subplot(row, col).set_xlabel(label)
@@ -840,6 +864,15 @@ def savefig(
                 self._save_plotly(fig, full_filepath)
                 if verbose:
                     print(f"Saved {full_filepath}")
+        elif backend == "tikzfigure":
+            if layers is not None:
+                raise NotImplementedError(
+                    "Layer-by-layer rendering is not supported for tikzfigure backend"
+                )
+            fig = self.plot(backend="tikzfigure", savefig=False)
+            fig.savefig(filename)
+            if verbose:
+                print(f"Saved {filename}")
 
     def plot(
         self,