修复文本颠倒问题，使用 GLUT 渲染文本

opengl-demo.py

@@ -0,0 +1,104 @@
+import os
+import vtk
+import pyvista as pv
+
+# -----------------------------------------------------------------------------
+# 1. 配置：要展示的文件夹路径（改成你自己的）
+# -----------------------------------------------------------------------------
+ROOT_FOLDER = r"./"  # 示例：当前目录
+MAX_DEPTH = 3        # 限制深度，防止太密
+NODE_SPACING_X = 2.0
+NODE_SPACING_Y = 1.5
+
+
+# -----------------------------------------------------------------------------
+# 2. 递归遍历文件夹，生成树形结构数据
+# -----------------------------------------------------------------------------
+class TreeNode:
+    def __init__(self, name, path, depth=0):
+        self.name = name
+        self.path = path
+        self.depth = depth
+        self.children = []
+        self.x = 0.0
+        self.y = 0.0
+
+
+def build_tree(folder, depth=0, max_depth=MAX_DEPTH):
+    node = TreeNode(os.path.basename(folder) or folder, folder, depth)
+    if depth >= max_depth:
+        return node
+
+    try:
+        entries = sorted(os.listdir(folder))
+    except PermissionError:
+        return node
+
+    for entry in entries:
+        full = os.path.join(folder, entry)
+        if os.path.isdir(full):
+            child = build_tree(full, depth + 1, max_depth)
+            node.children.append(child)
+    return node
+
+
+# -----------------------------------------------------------------------------
+# 3. 树布局算法（简单层级横向布局）
+# -----------------------------------------------------------------------------
+def layout_tree(node: TreeNode, x=0.0, y=0.0):
+    node.y = y
+    node.x = x
+
+    child_x = x - (len(node.children) - 1) * NODE_SPACING_X / 2
+    for child in node.children:
+        layout_tree(child, child_x, y - NODE_SPACING_Y)
+        child_x += NODE_SPACING_X
+
+
+# -----------------------------------------------------------------------------
+# 4. 收集所有节点、边用于 VTK 绘制
+# -----------------------------------------------------------------------------
+def collect_geometry(node):
+    points = []
+    lines = []
+    labels = []
+    stack = [node]
+
+    while stack:
+        n = stack.pop()
+        points.append([n.x, n.y, 0.0])
+        labels.append(n.name)
+        for child in n.children:
+            points.append([child.x, child.y, 0.0])
+            labels.append(child.name)
+            lines.append(2)  # 每个线段有两个点
+            lines.append(len(points)-2)  # 父节点的索引
+            lines.append(len(points)-1)  # 子节点的索引
+            stack.append(child)
+    return points, lines, labels
+
+
+# -----------------------------------------------------------------------------
+# 5. PyVista + VTK 绘制树
+# -----------------------------------------------------------------------------
+if __name__ == "__main__":
+    tree = build_tree(ROOT_FOLDER)
+    layout_tree(tree)
+    points, lines, labels = collect_geometry(tree)
+
+    # 构建点线云
+    cloud = pv.PolyData(points)
+    cloud.lines = lines
+    cloud["label"] = labels
+
+    # 绘图
+    plotter = pv.Plotter(window_size=(1200, 800))
+    plotter.add_mesh(cloud, color="#66ccff", point_size=12, render_lines_as_tubes=True, line_width=3)
+    plotter.add_point_labels(cloud, "label", font_size=8, shape_color="white")
+
+    plotter.add_text(
+        f"Folder Tree: {ROOT_FOLDER}\nMax Depth: {MAX_DEPTH}",
+        font_size=10, color="blue"
+    )
+    plotter.camera_position = "xy"
+    plotter.show()