Altlasfunktion eingebaut (wenn plotgröße größer als Zielformat)

assets/atlasobjekte.qml

@@ -0,0 +1,43 @@
+<!DOCTYPE qgis PUBLIC 'http://mrcc.com/qgis.dtd' 'SYSTEM'>
+<qgis version="3.34.0" styleCategories="AllStyleCategories">
+  <renderer-v2 type="singleSymbol" symbollevels="0" enableorderby="0" referencescale="-1" forceraster="0">
+    <symbols>
+      <symbol alpha="1" type="fill" name="0" force_rhr="0" clip_to_extent="1">
+        <layer class="SimpleFill" enabled="1" locked="0" pass="0">
+          <Option type="Map">
+            <Option name="border_width_map_unit_scale" type="QString" value="3x:0,0,0,0,0,0"/>
+            <Option name="color" type="QString" value="255,0,0,40"/>
+            <Option name="joinstyle" type="QString" value="bevel"/>
+            <Option name="offset" type="QString" value="0,0"/>
+            <Option name="offset_map_unit_scale" type="QString" value="3x:0,0,0,0,0,0"/>
+            <Option name="offset_unit" type="QString" value="MM"/>
+            <Option name="outline_color" type="QString" value="255,0,0,255"/>
+            <Option name="outline_style" type="QString" value="solid"/>
+            <Option name="outline_width" type="QString" value="0.8"/>
+            <Option name="outline_width_unit" type="QString" value="MM"/>
+            <Option name="style" type="QString" value="solid"/>
+          </Option>
+        </layer>
+      </symbol>
+    </symbols>
+  </renderer-v2>
+  <fieldConfiguration>
+    <field name="Seitenzahl" configurationFlags="None">
+      <editWidget type="Range">
+        <config>
+          <Option type="Map">
+            <Option name="AllowNull" type="bool" value="false"/>
+            <Option name="Max" type="double" value="9999"/>
+            <Option name="Min" type="double" value="1"/>
+            <Option name="Precision" type="int" value="0"/>
+            <Option name="Step" type="double" value="1"/>
+            <Option name="Style" type="QString" value="SpinBox"/>
+          </Option>
+        </config>
+      </editWidget>
+    </field>
+  </fieldConfiguration>
+  <defaults>
+    <default field="Seitenzahl" expression="" applyOnUpdate="0"/>
+  </defaults>
+</qgis>

ui/layout.py

@@ -199,3 +199,233 @@ class Layout:
         open_layout_designer(layout)
         print("[Layout] Layout Designer geöffnet")
         return layout
+
+    def create_atlas_layout(
+        self,
+        name: str,
+        page_width_mm: float,
+        page_height_mm: float,
+        map_width_mm: float,
+        map_height_mm: float,
+        extent: Any,
+        plotmassstab: float,
+        atlas_layer: Any,
+        thema: str = "",
+    ) -> Any:
+        """Erzeugt ein Atlas-Layout mit Coverage-Layer ``Atlasobjekte``."""
+        layout_manager = self.project.layoutManager()
+        existing_layout = layout_manager.layoutByName(name)
+        if existing_layout is not None:
+            raise ValueError(f"Eine Vorlage mit der Bezeichnung '{name}' existiert bereits.")
+
+        layout = QgsPrintLayout(self.project)
+        layout.initializeDefaults()
+        layout.setName(name)
+
+        page = layout.pageCollection().page(0)
+        page.setPageSize(QgsLayoutSize(page_width_mm, page_height_mm, MM))
+        # Verifiziere, dass QGIS die Größe akzeptiert hat
+        page_size = page.pageSize() if hasattr(page, 'pageSize') else None
+        if page_size is not None and hasattr(page_size, 'width'):
+            actual_w = float(page_size.width())
+            actual_h = float(page_size.height())
+            print(f"[Layout] Atlas Page gesetzt: x=0, y=0, width={page_width_mm:.1f}mm→{actual_w:.1f}mm, height={page_height_mm:.1f}mm→{actual_h:.1f}mm")
+        else:
+            print(f"[Layout] Atlas Page: x=0, y=0, width={page_width_mm:.1f}mm, height={page_height_mm:.1f}mm")
+
+        map_left_mm = 10.0
+        map_top_mm = 10.0
+        map_right_mm = map_left_mm + map_width_mm
+        map_bottom_mm = map_top_mm + map_height_mm
+
+        hauptkarte = QgsLayoutItemMap(layout)
+        hauptkarte.setId("Hauptkarte")
+        layout.addLayoutItem(hauptkarte)
+        hauptkarte.attemptMove(QgsLayoutPoint(map_left_mm, map_top_mm, MM))
+        hauptkarte.attemptResize(QgsLayoutSize(map_width_mm, map_height_mm, MM))
+        
+        # Verifiziere mit Units-bewussten Methoden (rect() kann andere Units verwenden).
+        actual_w = None
+        actual_h = None
+        actual_x = None
+        actual_y = None
+        
+        # Versuche zuerst, die Größe mit Unit-Methoden zu lesen
+        try:
+            if hasattr(hauptkarte, 'sizeWithUnits'):
+                size_item = hauptkarte.sizeWithUnits()
+                if hasattr(size_item, 'width') and hasattr(size_item, 'height'):
+                    actual_w = float(size_item.width())
+                    actual_h = float(size_item.height())
+        except Exception:
+            pass
+        
+        try:
+            if hasattr(hauptkarte, 'positionWithUnits'):
+                pos_item = hauptkarte.positionWithUnits()
+                if hasattr(pos_item, 'x') and hasattr(pos_item, 'y'):
+                    actual_x = float(pos_item.x())
+                    actual_y = float(pos_item.y())
+        except Exception:
+            pass
+        
+        # Fallback: nutze rect() und teile durch UnitFaktor, falls nötig
+        if actual_w is None or actual_h is None:
+            try:
+                actual_rect = hauptkarte.rect()
+                if actual_rect is not None:
+                    actual_w = float(actual_rect.width())
+                    actual_h = float(actual_rect.height())
+                    actual_x = float(actual_rect.x())
+                    actual_y = float(actual_rect.y())
+            except Exception:
+                pass
+        
+        if actual_w is not None and actual_h is not None:
+            print(f"[Layout] Atlas Hauptkarte gesetzt: x={map_left_mm:.1f}mm→{actual_x:.1f}mm, y={map_top_mm:.1f}mm→{actual_y:.1f}mm, width={map_width_mm:.1f}mm→{actual_w:.1f}mm, height={map_height_mm:.1f}mm→{actual_h:.1f}mm")
+        else:
+            print(f"[Layout] Atlas Hauptkarte: x={map_left_mm:.1f}mm, y={map_top_mm:.1f}mm, width={map_width_mm:.1f}mm, height={map_height_mm:.1f}mm")
+
+        if extent is not None and hasattr(extent, "isNull") and callable(extent.isNull) and not extent.isNull():
+            try:
+                hauptkarte.setExtent(extent)
+            except Exception:
+                pass
+
+        if isinstance(plotmassstab, (int, float)) and math.isfinite(plotmassstab) and plotmassstab > 0:
+            try:
+                hauptkarte.setScale(plotmassstab)
+            except Exception:
+                pass
+
+        set_frame_enabled = getattr(hauptkarte, "setFrameEnabled", None)
+        if callable(set_frame_enabled):
+            try:
+                set_frame_enabled(True)
+            except Exception:
+                pass
+
+        set_frame_stroke_width = getattr(hauptkarte, "setFrameStrokeWidth", None)
+        if callable(set_frame_stroke_width):
+            try:
+                set_frame_stroke_width(0.5)
+            except Exception:
+                pass
+
+        if thema and thema != "aktuell":
+            follow_theme = getattr(hauptkarte, "setFollowVisibilityPreset", None)
+            set_theme_name = getattr(hauptkarte, "setFollowVisibilityPresetName", None)
+            if callable(follow_theme):
+                try:
+                    follow_theme(True)
+                except Exception:
+                    pass
+            if callable(set_theme_name):
+                try:
+                    set_theme_name(thema)
+                except Exception:
+                    pass
+
+        set_atlas_driven = getattr(hauptkarte, "setAtlasDriven", None)
+        if callable(set_atlas_driven):
+            try:
+                set_atlas_driven(True)
+            except Exception:
+                pass
+
+        # Fester Atlas-Maßstab: plotmassstab bleibt unverändert.
+        set_scaling_mode = getattr(hauptkarte, "setAtlasScalingMode", None)
+        if callable(set_scaling_mode):
+            fixed_mode = getattr(QgsLayoutItemMap, "Fixed", None)
+            if fixed_mode is not None:
+                try:
+                    set_scaling_mode(fixed_mode)
+                except Exception:
+                    pass
+
+        set_atlas_margin = getattr(hauptkarte, "setAtlasMargin", None)
+        if callable(set_atlas_margin):
+            try:
+                set_atlas_margin(0.0)
+            except Exception:
+                pass
+
+        set_keep_layer_set = getattr(hauptkarte, "setKeepLayerSet", None)
+        if callable(set_keep_layer_set):
+            try:
+                set_keep_layer_set(True)
+            except Exception:
+                pass
+
+        # Sicherheit: Größe nochmal nach Atlas-Konfiguration setzen, um sicherzustellen, dass sie nicht von der Atlas-Einstellung überschrieben wurde.
+        hauptkarte.attemptResize(QgsLayoutSize(map_width_mm, map_height_mm, MM))
+        print(f"[Layout] Atlas Hauptkarte Größe nach Atlas-Konfiguration erneut gesetzt: {map_width_mm:.1f}mm × {map_height_mm:.1f}mm")
+
+        quellenangabe = QgsLayoutItemLabel(layout)
+        quellenangabe.setId("Quellenangabe")
+        quellenangabe.setText(
+            "Quelle Geobasisdaten: GeoSN, "
+            "<a href=\"https://www.govdata.de/dl-de/by-2-0\">dl-de/by-2-0</a><br><br>"
+            "Quelle Fachdaten: Darstellung auf der Grundlage von Daten und mit Erlaubnis des "
+            "Sächsischen Landesamtes für Umwelt, Landwirtschaft und Geologie<br><br>"
+            "Basemap:<br><br>"
+            "© GeoBasis-DE / <a href=\"https://www.bkg.bund.de\">BKG</a> ([%year($now)%]) "
+            "<a href=\"https://creativecommons.org/licences/by/4.0/\">CC BY 4.0</a> "
+            "mit teilweise angepasster Signatur<br>"
+        )
+        set_mode = getattr(quellenangabe, "setMode", None)
+        mode_html = getattr(QgsLayoutItemLabel, "ModeHtml", None)
+        if callable(set_mode) and mode_html is not None:
+            set_mode(mode_html)
+        quellenangabe.setFont(QFont("Arial", 12))
+        set_reference_point = getattr(quellenangabe, "setReferencePoint", None)
+        lower_left = getattr(getattr(QgsLayoutItem, "ReferencePoint", object), "LowerLeft", None)
+        if callable(set_reference_point) and lower_left is not None:
+            set_reference_point(lower_left)
+        quellenangabe.attemptMove(QgsLayoutPoint(map_right_mm + 5.0, map_bottom_mm, MM))
+        quellenangabe.attemptResize(QgsLayoutSize(180.0, 100.0, MM))
+        layout.addLayoutItem(quellenangabe)
+
+        seitenzahl_label = QgsLayoutItemLabel(layout)
+        seitenzahl_label.setId("Seitenzahl")
+        seitenzahl_label.setFont(QFont("Arial", 12))
+        set_expr_enabled = getattr(seitenzahl_label, "setExpressionEnabled", None)
+        if callable(set_expr_enabled):
+            try:
+                set_expr_enabled(True)
+            except Exception:
+                pass
+        # Ausdrucksauswertung robust über [% ... %]-Platzhalter.
+        seitenzahl_label.setText(
+            "Seite [% attribute(@atlas_feature, 'Seitenzahl') %] von [% @atlas_totalfeatures %]"
+        )
+        set_reference_point = getattr(seitenzahl_label, "setReferencePoint", None)
+        lower_left = getattr(getattr(QgsLayoutItem, "ReferencePoint", object), "LowerLeft", None)
+        if callable(set_reference_point) and lower_left is not None:
+            set_reference_point(lower_left)
+        seitenzahl_label.attemptMove(QgsLayoutPoint(map_right_mm + 5.0, map_bottom_mm - 2.0, MM))
+        seitenzahl_label.attemptResize(QgsLayoutSize(60.0, 8.0, MM))
+        layout.addLayoutItem(seitenzahl_label)
+
+        atlas = layout.atlas()
+        if atlas is not None:
+            set_enabled = getattr(atlas, "setEnabled", None)
+            set_coverage = getattr(atlas, "setCoverageLayer", None)
+            set_hide_coverage = getattr(atlas, "setHideCoverage", None)
+            set_filter_features = getattr(atlas, "setFilterFeatures", None)
+            set_page_name = getattr(atlas, "setPageNameExpression", None)
+
+            if callable(set_enabled):
+                set_enabled(True)
+            if callable(set_coverage):
+                set_coverage(atlas_layer)
+            if callable(set_hide_coverage):
+                set_hide_coverage(True)
+            if callable(set_filter_features):
+                set_filter_features(False)
+            if callable(set_page_name):
+                set_page_name("attribute(@atlas_feature, 'Seitenzahl')")
+
+        layout_manager.addLayout(layout)
+        open_layout_designer(layout)
+        return layout

ui/tab_b_logic.py

@@ -3,8 +3,20 @@ sn_plan41/ui/tab_b_logic.py – Fachlogik für Tab B (Druck)
 """
 from __future__ import annotations
 import math
+from typing import Any
+
+from sn_basis.functions.qt_wrapper import QVariant
 from sn_basis.functions.variable_wrapper import set_variable, get_variable
 from sn_basis.functions.qgiscore_wrapper import get_layer_extent
+from sn_basis.functions.qgiscore_wrapper import (
+    QgsProject,
+    QgsVectorLayer,
+    QgsGeometry,
+    QgsFeature,
+    QgsField,
+    QgsVectorFileWriter,
+)
+from sn_basis.functions.sys_wrapper import get_plugin_root, join_path, file_exists
 from sn_basis.modules.Pruefmanager import Pruefmanager
 from sn_basis.modules.layerpruefer import Layerpruefer
 from sn_plan41.ui.layout import Layout
@@ -53,6 +65,140 @@ class TabBLogic:
     def __init__(self, pruefmanager: Pruefmanager) -> None:
         self.pruefmanager = pruefmanager
 
+    @staticmethod
+    def _wkt_rect(x_min: float, y_min: float, x_max: float, y_max: float) -> str:
+        return (
+            f"POLYGON(({x_min} {y_min}, {x_max} {y_min}, {x_max} {y_max}, "
+            f"{x_min} {y_max}, {x_min} {y_min}))"
+        )
+
+    @staticmethod
+    def _set_topological_editing_enabled() -> None:
+        project = QgsProject.instance()
+        set_topological = getattr(project, "setTopologicalEditing", None)
+        if callable(set_topological):
+            try:
+                set_topological(True)
+            except Exception:
+                pass
+
+    @staticmethod
+    def _apply_atlas_style(layer: Any) -> None:
+        style_path = join_path(get_plugin_root(), "sn_plan41", "assets", "atlasobjekte.qml")
+        if not file_exists(style_path):
+            return
+        try:
+            ok, _ = layer.loadNamedStyle(str(style_path))
+            if ok:
+                getattr(layer, "triggerRepaint", lambda: None)()
+        except Exception:
+            pass
+
+    def _create_atlasobjekte_layer(
+        self,
+        layer: Any,
+        extent: Any,
+        pages_x: int,
+        pages_y: int,
+        seite_karte_w: float,
+        seite_karte_h: float,
+        massstab_zahl: float,
+    ) -> Any | None:
+        layer_crs = layer.crs() if hasattr(layer, "crs") else None
+        crs_authid = layer_crs.authid() if layer_crs is not None and hasattr(layer_crs, "authid") else "EPSG:25832"
+        atlas_layer = QgsVectorLayer(f"Polygon?crs={crs_authid}", "Atlasobjekte", "memory")
+        if not atlas_layer or not atlas_layer.isValid():
+            return None
+
+        provider = atlas_layer.dataProvider()
+        provider.addAttributes([
+            QgsField("Seitenzahl", QVariant.Int),
+        ])
+        atlas_layer.updateFields()
+
+        tile_w_m = seite_karte_w * massstab_zahl / 1000.0
+        tile_h_m = seite_karte_h * massstab_zahl / 1000.0
+
+        x_min = extent.xMinimum()
+        y_min = extent.yMinimum()
+        x_max = extent.xMaximum()
+        y_max = extent.yMaximum()
+
+        seitenzahl = 1
+        features = []
+        for row_idx in range(pages_y):
+            tile_y_max = y_max - row_idx * tile_h_m
+            tile_y_min = tile_y_max - tile_h_m
+
+            for col_idx in range(pages_x):
+                tile_x_min = x_min + col_idx * tile_w_m
+                tile_x_max = tile_x_min + tile_w_m
+
+                tile_geom = QgsGeometry.fromWkt(
+                    self._wkt_rect(tile_x_min, tile_y_min, tile_x_max, tile_y_max)
+                )
+
+                feat = QgsFeature(atlas_layer.fields())
+                feat.setGeometry(tile_geom)
+                feat["Seitenzahl"] = seitenzahl
+                features.append(feat)
+                seitenzahl += 1
+
+        if not features:
+            return None
+
+        provider.addFeatures(features)
+        atlas_layer.updateExtents()
+        self._set_topological_editing_enabled()
+
+        verfahrens_db = get_variable("verfahrens_db", scope="project") or ""
+        print(f"[TabBLogic] Atlasobjekte: verfahrens_db='{verfahrens_db}'")
+        if not verfahrens_db:
+            QgsProject.instance().addMapLayer(atlas_layer)
+            self._apply_atlas_style(atlas_layer)
+            print("[TabBLogic] Atlasobjekte temporär ins Projekt geladen")
+            return atlas_layer
+
+        opts = QgsVectorFileWriter.SaveVectorOptions()
+        opts.driverName = "GPKG"
+        opts.fileEncoding = "UTF-8"
+        opts.layerName = "Atlasobjekte"
+        if file_exists(verfahrens_db):
+            opts.actionOnExistingFile = QgsVectorFileWriter.CreateOrOverwriteLayer
+        else:
+            opts.actionOnExistingFile = QgsVectorFileWriter.CreateOrOverwriteFile
+
+        err_result = QgsVectorFileWriter.writeAsVectorFormatV3(
+            atlas_layer,
+            verfahrens_db,
+            QgsProject.instance().transformContext(),
+            opts,
+        )
+
+        # QGIS-Versionen liefern hier entweder nur WriterError
+        # oder ein Tupel (WriterError, msg, newPath, layerName).
+        err_code = err_result[0] if isinstance(err_result, tuple) else err_result
+        if err_code != QgsVectorFileWriter.NoError:
+            print(f"[TabBLogic] Atlasobjekte schreiben fehlgeschlagen: err={err_result}")
+            return None
+
+        for existing in QgsProject.instance().mapLayersByName("Atlasobjekte"):
+            try:
+                QgsProject.instance().removeMapLayer(existing.id())
+            except Exception:
+                pass
+
+        uri = f"{verfahrens_db}|layername=Atlasobjekte"
+        loaded_layer = QgsVectorLayer(uri, "Atlasobjekte", "ogr")
+        if not loaded_layer or not loaded_layer.isValid():
+            print(f"[TabBLogic] Atlasobjekte laden aus GPKG fehlgeschlagen: uri='{uri}'")
+            return None
+
+        QgsProject.instance().addMapLayer(loaded_layer)
+        self._apply_atlas_style(loaded_layer)
+        print("[TabBLogic] Atlasobjekte aus Verfahrens-DB geladen und gestylt")
+        return loaded_layer
+
     def set_kartenname_for_auswahl(self, auswahl: str) -> None:
         """Setzt die Projektvariable ``sn_kartenname`` anhand der Kartennamen-Auswahl."""
         kartenname = KARTENNAME_BY_AUSWAHL.get(auswahl, "")
@@ -178,9 +324,20 @@ class TabBLogic:
         else:
             ziel_w, ziel_h = float(din_dims[0]), float(din_dims[1])
 
+        if ziel_w < DIN_GROESSEN["DIN A4"][0] or ziel_h < DIN_GROESSEN["DIN A4"][1]:
+            self.pruefmanager.zeige_hinweis(
+                "Blattgröße zu klein",
+                "Die Zielgröße darf nicht kleiner als DIN A4 sein.",
+            )
+            return {"ok": False, "switch_to_tab_a": False, "atlas_seiten": 0}
+
         # ─── 7. Passt auf ein Blatt? -> Layout erzeugen ───────────────────
         print(f"[TabBLogic] plotgroesse=({plotgroesse_w:.1f}x{plotgroesse_h:.1f}), "
               f"zielgroesse=({ziel_w:.1f}x{ziel_h:.1f}), passt={plotgroesse_w <= ziel_w and plotgroesse_h <= ziel_h}")
+        if plotgroesse_w > ziel_w or plotgroesse_h > ziel_h:
+            if plotgroesse_w <= ziel_h and plotgroesse_h <= ziel_w:
+                ziel_w, ziel_h = ziel_h, ziel_w
+
         if plotgroesse_w <= ziel_w and plotgroesse_h <= ziel_h:
             kartenname = get_variable(KARTENNAME_VAR, scope="project") or KARTENNAME_BY_AUSWAHL.get(
                 kartenname_auswahl, "Vorlage"
@@ -247,7 +404,154 @@ class TabBLogic:
             "Ausdruck als Atlas anlegen?",
             default=True,
         )
+        print(f"[TabBLogic] Atlas-Rückfrage: ja={ja}, geplante_seiten={anzahl_seiten}")
         if not ja:
             return {"ok": False, "switch_to_tab_a": False, "atlas_seiten": anzahl_seiten}
 
+        atlas_layer = self._create_atlasobjekte_layer(
+            layer=layer,
+            extent=extent,
+            pages_x=pages_x,
+            pages_y=pages_y,
+            seite_karte_w=seite_karte_w,
+            seite_karte_h=seite_karte_h,
+            massstab_zahl=massstab_zahl,
+        )
+        if atlas_layer is None:
+            self.pruefmanager.zeige_hinweis(
+                "Atlasobjekte",
+                "Atlasobjekte-Layer konnte nicht erzeugt werden.",
+            )
+            return {"ok": False, "switch_to_tab_a": False, "atlas_seiten": 0}
+        print("[TabBLogic] Atlasobjekte-Layer erfolgreich erzeugt")
+
+        try:
+            anzahl_seiten = int(atlas_layer.featureCount())
+        except Exception:
+            pass
+
+        # Berechne die Kachelgröße aus den Atlasobjekten.
+        # Für die Layout-Kartengröße muss die größte Atlas-Kachel passen,
+        # sonst werden größere Atlasobjekte abgeschnitten.
+        total_w_m = 0.0
+        total_h_m = 0.0
+        min_w_m = math.inf
+        min_h_m = math.inf
+        max_w_m = 0.0
+        max_h_m = 0.0
+        feature_count = 0
+        get_features = getattr(atlas_layer, "getFeatures", None)
+        if callable(get_features):
+            try:
+                for feat in get_features():
+                    geom = feat.geometry() if hasattr(feat, "geometry") else None
+                    if geom is None or geom.isEmpty():
+                        continue
+                    bbox = geom.boundingBox() if hasattr(geom, "boundingBox") else None
+                    if bbox is None:
+                        continue
+                    feat_w_m = float(bbox.width())
+                    feat_h_m = float(bbox.height())
+                    total_w_m += feat_w_m
+                    total_h_m += feat_h_m
+                    min_w_m = min(min_w_m, feat_w_m)
+                    min_h_m = min(min_h_m, feat_h_m)
+                    max_w_m = max(max_w_m, feat_w_m)
+                    max_h_m = max(max_h_m, feat_h_m)
+                    feature_count += 1
+            except Exception:
+                pass
+
+        if feature_count > 0:
+            avg_tile_w_m = total_w_m / feature_count
+            avg_tile_h_m = total_h_m / feature_count
+            if not math.isfinite(min_w_m):
+                min_w_m = avg_tile_w_m
+            if not math.isfinite(min_h_m):
+                min_h_m = avg_tile_h_m
+            target_tile_w_m = max_w_m
+            target_tile_h_m = max_h_m
+        else:
+            avg_tile_w_m = seite_karte_w * massstab_zahl / 1000.0
+            avg_tile_h_m = seite_karte_h * massstab_zahl / 1000.0
+            min_w_m = avg_tile_w_m
+            min_h_m = avg_tile_h_m
+            max_w_m = avg_tile_w_m
+            max_h_m = avg_tile_h_m
+            target_tile_w_m = avg_tile_w_m
+            target_tile_h_m = avg_tile_h_m
+
+        # Konvertiere Kachelgrößen zu mm
+        avg_tile_w_mm = avg_tile_w_m * 1000.0 / massstab_zahl
+        avg_tile_h_mm = avg_tile_h_m * 1000.0 / massstab_zahl
+        min_tile_w_mm = min_w_m * 1000.0 / massstab_zahl
+        min_tile_h_mm = min_h_m * 1000.0 / massstab_zahl
+        max_tile_w_mm = max_w_m * 1000.0 / massstab_zahl
+        max_tile_h_mm = max_h_m * 1000.0 / massstab_zahl
+        target_tile_w_mm = target_tile_w_m * 1000.0 / massstab_zahl
+        target_tile_h_mm = target_tile_h_m * 1000.0 / massstab_zahl
+
+        # Layout-Kartengröße = größte Kachelgröße
+        atlas_map_w = max(1.0, target_tile_w_mm)
+        atlas_map_h = max(1.0, target_tile_h_mm)
+        atlas_page_w = atlas_map_w + 210.0
+        atlas_page_h = atlas_map_h + 20.0
+
+        # Debug: Atlasobjekte Geometrien
+        print(
+            f"[TabBLogic] Atlasobjekte Geometrien (Meter): "
+            f"total_w={total_w_m:.1f}m, total_h={total_h_m:.1f}m, "
+            f"min_w={min_w_m:.1f}m, min_h={min_h_m:.1f}m, "
+            f"avg_w={avg_tile_w_m:.1f}m, avg_h={avg_tile_h_m:.1f}m, "
+            f"max_w={max_w_m:.1f}m, max_h={max_h_m:.1f}m, features={feature_count}"
+        )
+        print(
+            f"[TabBLogic] Atlas layout Größen: "
+            f"page=(x=10, y=10, w={atlas_page_w:.1f}mm, h={atlas_page_h:.1f}mm), "
+            f"map=(x=10, y=10, w={atlas_map_w:.1f}mm, h={atlas_map_h:.1f}mm), "
+            f"kachel_min_mm=({min_tile_w_mm:.1f}x{min_tile_h_mm:.1f}), "
+            f"kachel_avg_mm=({avg_tile_w_mm:.1f}x{avg_tile_h_mm:.1f}), "
+            f"kachel_max_mm=({max_tile_w_mm:.1f}x{max_tile_h_mm:.1f})"
+        )
+
+        kartenname = get_variable(KARTENNAME_VAR, scope="project") or KARTENNAME_BY_AUSWAHL.get(
+            kartenname_auswahl, "Atlas"
+        )
+        thema = get_variable(VIEW_VAR, scope="project") or ""
+        vorlage_name, bestaetigt = self.pruefmanager.frage_text(
+            "Neue Atlasvorlage anlegen",
+            "Bezeichnung der Vorlage:",
+            default_text=f"{kartenname} Atlas",
+        )
+        print(f"[TabBLogic] Atlas frage_text Ergebnis: name='{vorlage_name}', bestaetigt={bestaetigt}")
+        if not bestaetigt:
+            return {"ok": False, "switch_to_tab_a": False, "atlas_seiten": anzahl_seiten}
+
+        vorlage_name = (vorlage_name or "").strip() or f"{kartenname} Atlas"
+
+        try:
+            print(
+                f"[TabBLogic] Rufe create_atlas_layout auf: name='{vorlage_name}', "
+                f"page=({atlas_page_w:.1f}x{atlas_page_h:.1f}), "
+                f"map=({atlas_map_w:.1f}x{atlas_map_h:.1f}), massstab={massstab_zahl}, thema='{thema}'"
+            )
+            Layout().create_atlas_layout(
+                name=vorlage_name,
+                page_width_mm=atlas_page_w,
+                page_height_mm=atlas_page_h,
+                map_width_mm=atlas_map_w,
+                map_height_mm=atlas_map_h,
+                extent=extent,
+                plotmassstab=massstab_zahl,
+                atlas_layer=atlas_layer,
+                thema=thema,
+            )
+            print("[TabBLogic] create_atlas_layout erfolgreich abgeschlossen")
+        except ValueError as exc:
+            self.pruefmanager.zeige_hinweis("Atlasvorlage anlegen", str(exc))
+            return {"ok": False, "switch_to_tab_a": False, "atlas_seiten": 0}
+        except Exception as exc:
+            self.pruefmanager.zeige_hinweis("Atlasvorlage anlegen", f"Die Atlasvorlage konnte nicht angelegt werden: {exc}")
+            return {"ok": False, "switch_to_tab_a": False, "atlas_seiten": 0}
+
         return {"ok": True, "switch_to_tab_a": False, "atlas_seiten": anzahl_seiten}