Add support for tetraflexagons

[flexagon-toolkit.git] / src / svg_tetraflexagon_editor.py

diff --git a/src/svg_tetraflexagon_editor.py b/src/svg_tetraflexagon_editor.py
new file mode 100755 (executable)
index 0000000..ce2794b
--- /dev/null
+++ b/src/svg_tetraflexagon_editor.py
@@ -0,0 +1,132 @@
+#!/usr/bin/env python3
+#
+# Draw an SVG tetraflexagon which can be edited live in Inkscape.
+#
+# Copyright (C) 2018  Antonio Ospite <ao2@ao2.it>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import svgwrite
+
+from diagram.svgwrite_diagram import SvgwriteDiagram
+from flexagon.tetraflexagon_diagram import TetraflexagonDiagram
+
+
+class SvgwriteTetraflexagonDiagram(TetraflexagonDiagram):
+    def __init__(self, *args, **kwargs):
+        super(SvgwriteTetraflexagonDiagram, self).__init__(*args, **kwargs)
+
+        svg = self.backend.svg
+
+        # create some layers and groups
+        layers = {
+            "Squares": svg.layer(label="Squares"),
+            "Tetraflexagon": svg.layer(label="Tetraflexagon"),
+            "Template": svg.layer(label="Template")
+        }
+        for layer in layers.values():
+            svg.add(layer)
+
+        self.groups = layers
+
+        for square in self.tetraflexagon.squares:
+            name = "square%d-content" % square.index
+            layer = svg.layer(id=name, label="Square %d" % (square.index + 1))
+            self.groups[name] = layer
+            layers['Squares'].add(layer)
+
+            for tile in square.tiles:
+                name = "square%d-tile%d" % (square.index, tile.index)
+                group = svg.g(id=name)
+                self.groups[name] = group
+                layers['Template'].add(group)
+
+    def draw(self):
+        for square in self.tetraflexagon.squares:
+            cx, cy = self.get_square_center(square)
+
+            # Draw some default content
+            old_active_group = self.backend.active_group
+            self.backend.active_group = self.groups["square%d-content" % square.index]
+            self.backend.draw_rect_from_center(cx, cy, self.square_side, self.square_side, 0,
+                                               fill_color=(0.5, 0.5, 0.5, 0.2))
+            self.backend.active_group = old_active_group
+
+            self.backend.active_group = old_active_group
+
+        # Draw the normal template for squares
+        for square in self.tetraflexagon.squares:
+            self.draw_square_template(square)
+
+        # draw plan using references
+        for square in self.tetraflexagon.squares:
+            for tile in square.tiles:
+                m = self.get_tile_transform(tile)
+                svg_matrix = "matrix(%f, %f, %f, %f, %f, %f)" % (m[0], m[3],
+                                                                 m[1], m[4],
+                                                                 m[2], m[5])
+
+                # Reuse the squares tile for the tetraflexagon template
+                group = self.groups["Template"]
+                tile_href = "#square%d-tile%d" % (square.index, tile.index)
+                ref = self.backend.svg.use(tile_href)
+                ref['transform'] = svg_matrix
+                group.add(ref)
+
+                # Reuse the content to draw the final tetraflexagon
+                group = self.groups["Tetraflexagon"]
+                content_href = "#square%d-content" % square.index
+                ref = self.backend.svg.use(content_href)
+                ref['transform'] = svg_matrix
+                ref['clip-path'] = "url(%s)" % (tile_href + '-clip-path')
+                group.add(ref)
+
+    def draw_tile_template(self, tile, cx, cy, theta):
+        old_active_group = self.backend.active_group
+        group_name = "square%d-tile%d" % (tile.square.index, tile.index)
+        self.backend.active_group = self.groups[group_name]
+
+        super(SvgwriteTetraflexagonDiagram, self).draw_tile_template(tile, cx, cy, theta)
+
+        # The tile outline in the active group's element is the only polygon
+        # element, so get it and set its id so that it can be reused as
+        # a clip-path
+        for element in self.backend.active_group.elements:
+            if isinstance(element, svgwrite.shapes.Rect):
+                element['id'] = group_name + "-outline"
+                break
+
+        clip_path = self.backend.svg.clipPath(id=group_name + '-clip-path')
+        self.backend.svg.defs.add(clip_path)
+        ref = self.backend.svg.use('#%s-outline' % group_name)
+        clip_path.add(ref)
+
+        self.backend.active_group = old_active_group
+
+def main():
+    width = 3508
+    height = 2480
+
+    x_border = width / 50
+    font_size = width / 80
+    stroke_width = width / 480
+
+    svg_backend = SvgwriteDiagram(width, height, font_size=font_size, stroke_width=stroke_width)
+    tetraflexagon = SvgwriteTetraflexagonDiagram(x_border, backend=svg_backend)
+    tetraflexagon.draw()
+    svg_backend.save_svg("inkscape-tetraflexagon-editor.svg")
+
+
+if __name__ == "__main__":
+    main()