Added Scale to Size (legacy)

extensions/fablabchemnitz_scaletosize.inx

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<inkscape-extension xmlns="http://www.inkscape.org/namespace/inkscape/extension">
+   <_name>Scale To Size</_name>
+   <id>fablabchemnitz.de.scaletosize</id>
+    <param name="unit" _gui-text="Unit" type="optiongroup">
+        <option value="mm">mm</option>
+        <option value="cm">cm</option>
+        <option value="m">m</option>
+        <option value="in">in</option>
+        <option value="pt">pt</option>
+        <option value="px">px</option>
+    </param>
+   <param name="expected_size" type="float" min="0.001" max="10000.0" _gui-text="Expected size: ">10.0</param>
+   <param name="scale_type" type="optiongroup" _gui-text="Scaling type: ">
+      <option value="Horizontal">Horizontal</option>
+      <option value="Vertical">Vertical</option>
+      <option value="Uniform">Uniform</option>
+   </param>
+   <page name="desc" _gui-text="Help">
+      <_param name="description" type="description" xml:space="preserve">This effect will measure the selected paths and scale them to have the given size. Does not work for objects (you need to convert)!</_param>
+   </page>
+   <effect>
+      <object-type>all</object-type>
+      <effects-menu>
+         <submenu _name="FabLab Chemnitz">
+            <submenu _name="Modify existing Path(s)" />
+         </submenu>
+      </effects-menu>
+   </effect>
+   <script>
+      <command reldir="extensions" interpreter="python">fablabchemnitz_scaletosize.py</command>
+   </script>
+</inkscape-extension>

extensions/fablabchemnitz_scaletosize.py

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+#!/usr/bin/env python3
+
+# Author: Mario Voigt / FabLab Chemnitz
+# Mail: mario.voigt@stadtfabrikanten.org
+# Date: 04.08.2020
+# License: GNU GPL v3
+
+import inkex
+from inkex.paths import CubicSuperPath, Path
+from inkex import Transform
+from lxml import etree
+from inkex.styles import Style
+
+# This extension can scale any object or path on X, Y or both axes. This addon is kind of obsolete because you can do the same from transforms menu
+
+class ScaleToSize(inkex.Effect):
+    def __init__(self):
+        inkex.Effect.__init__(self)
+        self.arg_parser.add_argument('--unit')
+        self.arg_parser.add_argument("--expected_size", type=float, default=1.0, help="The expected size of the object")
+        self.arg_parser.add_argument("--scale_type", default="Horizontal", help="Scale type (Uniform, Horizontal, Vertical)")
+        self.arg_parser.add_argument("--description")
+
+    def effect(self):
+        unit_factor = 1.0 / self.svg.uutounit(1.0,self.options.unit)
+        for node in self.svg.selected:
+		
+            #get recent XY coordinates (top left corner of the bounding box)
+            bbox = node.bounding_box()
+            new_horiz_scale = self.options.expected_size * unit_factor / bbox.width
+            new_vert_scale = self.options.expected_size * unit_factor / bbox.height
+			
+            if self.options.scale_type == "Horizontal":
+                translation_matrix = [[new_horiz_scale, 0.0, 0.0], [0.0, 1.0, 0.0]]
+            elif self.options.scale_type == "Vertical":
+                translation_matrix = [[1.0, 0.0, 0.0], [0.0, new_vert_scale, 0.0]]
+            else: #Uniform
+                translation_matrix = [[new_horiz_scale, 0.0, 0.0], [0.0, new_vert_scale, 0.0]]			
+            node.transform = Transform(translation_matrix) * node.transform
+			
+            # now that the node moved we need to get the nodes XY coordinates again to fix them
+            bbox_new = node.bounding_box()
+
+            #inkex.utils.debug(cx)
+            #inkex.utils.debug(cy)
+            #inkex.utils.debug(cx_new)
+            #inkex.utils.debug(cy_new)
+		
+            # We remove the transformation attribute from SVG XML tree in case it's regular path. In case the node is an object like arc,circle, ellipse or star we have the attribute "sodipodi:type". Then we do not play with it's path because the size transformation will not apply (this code block is ugly)
+            if node.get ('sodipodi:type') is None and 'd' in node.attrib:
+                #inkex.utils.debug("it's a path!")
+                d = node.get('d')
+                p = CubicSuperPath(d)
+                transf = Transform(node.get("transform", None))
+                if 'transform' in node.attrib:
+                    del node.attrib['transform']
+                p = Path(p).to_absolute().transform(transf, True)
+                node.set('d', Path(CubicSuperPath(p).to_path()))
+            #else:
+                #inkex.utils.debug("it's an object!")
+		
+            #we perform second translation to reset the center of the path				
+            translation_matrix = [[1.0, 0.0, bbox.left - bbox_new.left + (bbox.width - bbox_new.width)/2], [0.0, 1.0, bbox.top - bbox_new.top + (bbox.height - bbox_new.height)/2]]			
+            node.transform = Transform(translation_matrix) * node.transform	
+		
+if __name__ == '__main__':
+    ScaleToSize().run()