update csv export and added fixed mesh axis drawing

examples/gui/widgets/log_panel.py

@@ -22,12 +22,13 @@ class TeeStream:
 
 
 class WidgetLogHandler:
-    """Mirror print output into a QPlainTextEdit with a live status line at the bottom."""
+    """Mirror print output into a QPlainTextEdit with pinned status lines at the bottom."""
 
     def __init__(self, widget: QPlainTextEdit):
         self.widget = widget
         self.buf = ""
-        self._has_status_line = False
+        self._status_text: str | None = None
+        self._status_block_count = 0
 
     def write(self, text: str):
         self.buf += text
@@ -42,34 +43,42 @@ class WidgetLogHandler:
             self.buf = ""
 
     def set_status_line(self, text: str) -> None:
-        """Update the pinned bottom line (FPS / forces) without scrolling the log."""
+        """Update pinned bottom status (supports multi-line) without scrolling away."""
         text = text.rstrip("\n")
-        if self._has_status_line:
-            cursor = QTextCursor(self.widget.document().lastBlock())
-            cursor.select(QTextCursor.BlockUnderCursor)
-            cursor.insertText(text)
-        else:
-            self.widget.appendPlainText(text)
-            self._has_status_line = True
+        self._remove_status_blocks()
+        self.widget.appendPlainText(text)
+        self._status_text = text
+        self._status_block_count = max(1, text.count("\n") + 1)
         scrollbar = self.widget.verticalScrollBar()
         scrollbar.setValue(scrollbar.maximum())
 
     def clear_status_line(self) -> None:
-        if not self._has_status_line:
+        self._remove_status_blocks()
+        self._status_text = None
+        self._status_block_count = 0
+
+    def _remove_status_blocks(self) -> None:
+        if self._status_block_count <= 0:
             return
-        cursor = QTextCursor(self.widget.document().lastBlock())
-        cursor.select(QTextCursor.BlockUnderCursor)
+        doc = self.widget.document()
+        end = QTextCursor(doc)
+        end.movePosition(QTextCursor.End)
+        start = QTextCursor(doc)
+        start.movePosition(QTextCursor.End)
+        for _ in range(self._status_block_count):
+            start.movePosition(QTextCursor.StartOfBlock)
+            if start.position() > 0:
+                start.movePosition(QTextCursor.Left)
+        cursor = QTextCursor(doc)
+        cursor.setPosition(start.position())
+        cursor.setPosition(end.position(), QTextCursor.KeepAnchor)
         cursor.removeSelectedText()
-        self._has_status_line = False
+        self._status_block_count = 0
 
     def _append_log_line(self, line: str) -> None:
-        status = None
-        if self._has_status_line:
-            status = self.widget.document().lastBlock().text()
-            cursor = QTextCursor(self.widget.document().lastBlock())
-            cursor.select(QTextCursor.BlockUnderCursor)
-            cursor.removeSelectedText()
-            self._has_status_line = False
+        status = self._status_text
+        if status is not None:
+            self.clear_status_line()
         self.widget.appendPlainText(line)
         if status is not None:
             self.set_status_line(status)