From cf233ff5bbc68bd598ef4b81c7b4063548f2eff9 Mon Sep 17 00:00:00 2001
From: Maximilian Albert <maximilian.albert@gmail.com>
Date: Thu, 21 Jun 2007 13:01:57 +0000
Subject: First (very limited) version of the 3D box tool; allows for drawing
 of new boxes in a fixed perspective without any live interaction.

(bzr r3084)
---
 src/vanishing-point.cpp | 101 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 src/vanishing-point.cpp

(limited to 'src/vanishing-point.cpp')

diff --git a/src/vanishing-point.cpp b/src/vanishing-point.cpp
new file mode 100644
index 000000000..7933fbeba
--- /dev/null
+++ b/src/vanishing-point.cpp
@@ -0,0 +1,101 @@
+#define __VANISHING_POINT_C__
+
+/*
+ * Vanishing point for 3D perspectives
+ *
+ * Authors:
+ *   Maximilian Albert <Anhalter42@gmx.de>
+ *
+ * Copyright (C) 2007 authors
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "vanishing-point.h"
+#include <iostream>
+
+namespace Box3D {
+
+// FIXME: We should always require to have both the point (for finite VPs)
+//        and the direction (for infinite VPs) set. Otherwise toggling 
+//        shows very unexpected behaviour.
+//        Later on we can maybe infer the infinite direction from the finite point
+//        and a suitable center of the scene. How to go in the other direction?
+VanishingPoint::VanishingPoint(NR::Point const &pt, NR::Point const &inf_dir, VPState st)
+                             : NR::Point (pt), state (st), v_dir (inf_dir) {}
+
+VanishingPoint::VanishingPoint(NR::Point const &pt)
+                             : NR::Point (pt), state (VP_FINITE), v_dir (0.0, 0.0) {}
+
+VanishingPoint::VanishingPoint(NR::Point const &pt, NR::Point const &direction)
+                             : NR::Point (pt), state (VP_INFINITE), v_dir (direction) {}
+
+VanishingPoint::VanishingPoint(NR::Coord x, NR::Coord y)
+                             : NR::Point(x, y), state(VP_FINITE), v_dir(0.0, 0.0) {}
+
+VanishingPoint::VanishingPoint(NR::Coord dir_x, NR::Coord dir_y, VPState st)
+                             : NR::Point(0.0, 0.0), state(st), v_dir(dir_x, dir_y) {}
+
+VanishingPoint::VanishingPoint(NR::Coord x, NR::Coord y, NR::Coord dir_x, NR::Coord dir_y)
+                             : NR::Point(x, y), state(VP_INFINITE), v_dir(dir_x, dir_y) {}
+
+VanishingPoint::VanishingPoint(VanishingPoint const &rhs) : NR::Point (rhs)
+{
+    this->state = rhs.state;
+    //this->ref_pt = rhs.ref_pt;
+    this->v_dir = rhs.v_dir;
+}
+
+
+bool VanishingPoint::is_finite()
+{
+    return this->state == VP_FINITE;
+}
+
+VPState VanishingPoint::toggle_parallel()
+{
+    if (this->state == VP_FINITE) {
+    	this->state = VP_INFINITE;
+    } else {
+    	this->state = VP_FINITE;
+    }
+
+    return this->state;
+}
+
+void VanishingPoint::draw(PerspDir const axis)
+{
+    switch (axis) {
+        case X:
+            if (state == VP_FINITE)
+                create_canvas_point(*this, 6.0, 0xff000000);
+            else
+                create_canvas_point(*this, 6.0, 0xffffff00);
+            break;
+        case Y:
+            if (state == VP_FINITE)
+                create_canvas_point(*this, 6.0, 0x0000ff00);
+            else
+                create_canvas_point(*this, 6.0, 0xffffff00);
+            break;
+        case Z:
+            if (state == VP_FINITE)
+                create_canvas_point(*this, 6.0, 0x00770000);
+            else
+                create_canvas_point(*this, 6.0, 0xffffff00);
+            break;
+    }
+}
+
+} // namespace Box3D 
+ 
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :
-- 
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