From 3049644b2ba2045efb96c698105956ce6fedae08 Mon Sep 17 00:00:00 2001
From: dxiao <dxiao@mit.edu>
Date: Sun, 20 Feb 2011 14:24:25 -0500
Subject: added ParametricLocationInput

---
 inputs/ParametricLocationInput.py | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 inputs/ParametricLocationInput.py

diff --git a/inputs/ParametricLocationInput.py b/inputs/ParametricLocationInput.py
new file mode 100644
index 0000000..f413c64
--- /dev/null
+++ b/inputs/ParametricLocationInput.py
@@ -0,0 +1,39 @@
+import util.TimeOps as clock
+import util.ComponentRegistry as compReg
+import util.Strings as Strings
+from operationscore.Input import *
+class ParametricLocationInput(Input):
+    '''Continuously returns one of nine positions on the screen as specified by the xloc
+    and yloc arguments, which can take values 'min', 'max', and 'center'. '''
+
+    def clockTick(self):
+        return clock.time() - clock.t
+
+    def callTick(self):
+        self.t += 1
+        return self.t - 1
+
+    def inputInit(self):
+        self.t = 0
+
+        compReg.getLock().acquire()
+        xmin, ymin, xmax, ymax = compReg.getComponent('Screen').getSize()
+        compReg.getLock().release()
+
+        xlen = xmax-xmin
+        ylen = ymax-ymin
+
+        if self['useClock']:
+            self.t=self.clock()
+            self.getTime = self.clockTick
+        else:
+            self.t=0
+            self.getTime = self.callTick
+
+        self.x_eqn = eval('lambda t:' + str(xmin) + '+' + str(xlen) + '*(' + str(self['xEquation']) + ')')
+        self.y_eqn = eval('lambda t:' + str(xmin) + '+' + str(xlen) + '*(' + str(self['yEquation']) + ')')
+
+    def sensingLoop(self):
+        self.respond({Strings.LOCATION: (self.x_eqn(self.t), self.y_eqn(self.t))})
+        self.t += 1
+        
-- 
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