From 05eb8e0324175b0eb290e81db5764600699df086 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+git@gmail.com>
Date: Mon, 28 Mar 2011 18:33:27 -0400
Subject: [PATCH] add XDistance and YDistance constraints

---
 XDistance.py | 20 ++++++++++++++++++++
 YDistance.py | 20 ++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 XDistance.py
 create mode 100644 YDistance.py

diff --git a/XDistance.py b/XDistance.py
new file mode 100644
index 0000000..a4afdc2
--- /dev/null
+++ b/XDistance.py
@@ -0,0 +1,20 @@
+
+from Constraint import Constraint
+
+class Vertical(Constraint):
+    def __init__(self, shape1, pt1, shape2, pt2, dist):
+        self.shape1 = shape1
+        self.pt1 = pt1
+        self.shape2 = shape2
+        self.pt2 = pt2
+        self.dist
+
+    def toEqu(self):
+        varrefs1 = self.shape1.toEqu(pt1)[0]
+        varrefs2 = self.shape2.toEqu(pt2)[0]
+        coeffs = []
+        for i in range(len(varrefs1)):
+            coeffs.append((-1 * varrefs1[i], (self.shape1, i)))
+        for i in range(len(varrefs2)):
+            coeffs.append((1 * varrefs2[i], (self.shape2, i))
+        return [(coeffs, self.dist)]
diff --git a/YDistance.py b/YDistance.py
new file mode 100644
index 0000000..78305e0
--- /dev/null
+++ b/YDistance.py
@@ -0,0 +1,20 @@
+
+from Constraint import Constraint
+
+class Horizontal(Constraint):
+    def __init__(self, shape1, pt1, shape2, pt2, dist):
+        self.shape1 = shape1
+        self.pt1 = pt1
+        self.shape2 = shape2
+        self.pt2 = pt2
+        self.dist = dist
+
+    def toEqu(self):
+        varrefs1 = self.shape1.toEqu(pt1)[1]
+        varrefs2 = self.shape2.toEqu(pt2)[1]
+        coeffs = []
+        for i in range(len(varrefs1)):
+            coeffs.append((-1 * varrefs1[i], (self.shape1, i)))
+        for i in range(len(varrefs2)):
+            coeffs.append((1 * varrefs2[i], (self.shape2, i))
+        return [(coeffs, self.dist)]