added optional orthogonal view

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@651 bbaffbd6-741e-11dd-a85d-61de82d9cad9

Changelog

 Version 0.3.1 - UNRELEASED
  * added automatic support grid positioning for contour models
  * allow to reverse the direction of a 2D contour model
+ * added optional "orthogonal" view (instead of perspective)
 
 Version 0.3.0 - 2010-08-16
  * added support for importing contour paths from SVG files (requires Inkscape and pstoedit)

share/gtk-interface/pycam-project.ui

@@ -5792,6 +5792,20 @@ It is significantly faster, but the current release of ODE contains a nasty bug
                             <property name="position">2</property>
                           </packing>
                         </child>
+                        <child>
+                          <object class="GtkCheckButton" id="OpenGLPerspective">
+                            <property name="label" translatable="yes">Perspective view</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">False</property>
+                            <property name="tooltip_text" translatable="yes">Toggle between orthogonal and perspective view.</property>
+                            <property name="draw_indicator">True</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="position">3</property>
+                          </packing>
+                        </child>
                         <child>
                           <object class="GtkHBox" id="hbox7">
                             <property name="visible">True</property>
@@ -5822,7 +5836,7 @@ It is significantly faster, but the current release of ODE contains a nasty bug
                           </object>
                           <packing>
                             <property name="expand">False</property>
-                            <property name="position">3</property>
+                            <property name="position">4</property>
                           </packing>
                         </child>
                       </object>
@@ -6126,7 +6140,7 @@ You should have received a copy of the GNU General Public License along with thi
     <property name="always_show_image">True</property>
   </object>
   <object class="GtkAdjustment" id="ScaleDimensionValue">
-    <property name="upper">2000</property>
+    <property name="upper">10000</property>
     <property name="step_increment">1</property>
   </object>
   <object class="GtkImage" id="ShowToolPathSimulation">

src/pycam/Gui/OpenGLTools.py

@@ -200,8 +200,22 @@ class Camera:
         camera_position = (v["center"][0] + v["distance"][0],
                 v["center"][1] + v["distance"][1],
                 v["center"][2] + v["distance"][2])
-        GLU.gluPerspective(v["fovy"], (0.0 + width) / height, v["znear"],
-                v["zfar"])
+        if self.settings.get("view_perspective"):
+            # perspective view
+            GLU.gluPerspective(v["fovy"], (0.0 + width) / height, v["znear"],
+                    v["zfar"])
+        else:
+            # parallel projection
+            # This distance calculation is completely based on trial-and-error.
+            distance = math.sqrt(sum([d ** 2 for d in v["distance"]]))
+            distance *= math.log(math.sqrt(width * height)) / math.log(10)
+            left = v["center"][0] - math.sin(v["fovy"] / 360.0 * math.pi) * distance
+            right = v["center"][0] + math.sin(v["fovy"] / 360.0 * math.pi) * distance
+            top = v["center"][1] + math.sin(v["fovy"] / 360.0 * math.pi) * distance
+            bottom = v["center"][1] - math.sin(v["fovy"] / 360.0 * math.pi) * distance
+            near = v["center"][2] - 2 * math.sin(v["fovy"] / 360.0 * math.pi) * distance
+            far = v["center"][2] + 2 * math.sin(v["fovy"] / 360.0 * math.pi) * distance
+            GL.glOrtho(left, right, bottom, top, near, far)
         GLU.gluLookAt(camera_position[0], camera_position[1],
                 camera_position[2], v["center"][0], v["center"][1],
                 v["center"][2], v["up"][0], v["up"][1], v["up"][2])

src/pycam/Gui/Project.py

@@ -92,6 +92,7 @@ PREFERENCES_DEFAULTS = {
         "view_light": True,
         "view_shadow": True,
         "view_polygon": True,
+        "view_perspective": True,
         "simulation_details_level": 3,
         "drill_progress_max_fps": 2,
         "gcode_safety_height": 25.0,
@@ -459,7 +460,8 @@ class ProjectGui:
         for name, objname in (
                 ("view_light", "OpenGLLight"),
                 ("view_shadow", "OpenGLShadow"),
-                ("view_polygon", "OpenGLPolygon")):
+                ("view_polygon", "OpenGLPolygon"),
+                ("view_perspective", "OpenGLPerspective")):
             obj = self.gui.get_object(objname)
             self.settings.add_item(name, obj.get_active, obj.set_active)
             # send "True" to trigger a re-setup of GL settings