From 0b3f6503bbe38a129f1f9395c0d3924c4ad87185 Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p.janouch@gmail.com>
Date: Fri, 7 Jan 2011 16:25:15 +0100
Subject: Add basic logical symbols (NOT, AND, OR).

---
 share/library/Logical/and.lua | 41 ++++++++++++++++++++++++++++++++
 share/library/Logical/not.lua | 41 ++++++++++++++++++++++++++++++++
 share/library/Logical/or.lua  | 55 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 137 insertions(+)
 create mode 100644 share/library/Logical/and.lua
 create mode 100644 share/library/Logical/not.lua
 create mode 100644 share/library/Logical/or.lua

diff --git a/share/library/Logical/and.lua b/share/library/Logical/and.lua
new file mode 100644
index 0000000..57f7325
--- /dev/null
+++ b/share/library/Logical/and.lua
@@ -0,0 +1,41 @@
+-- Symbol name
+names =
+{
+	en = "AND",
+	cs = "AND"
+}
+
+-- Render area in base units (X1, Y1, X2, Y2)
+area = {-4, -2, 5, 2}
+
+-- Terminals
+terminals = {{-4, -1}, {-4, 1}, {5, 0}}
+
+-- Rendering
+render = function (cr)
+	-- The main shape
+	cr.move_to (-2, -2)
+	cr.line_to (1, -2)
+	cr.arc (1, 0, 2, math.pi * 1.5, math.pi * 0.5)
+	cr.line_to (-2, 2)
+	cr.close_path ()
+	cr.stroke ()
+
+	-- The contacts
+	cr.move_to (-4, -1)
+	cr.line_to (-2, -1)
+	cr.stroke ()
+
+	cr.move_to (-4, 1)
+	cr.line_to (-2, 1)
+	cr.stroke ()
+
+	cr.move_to (3, 0)
+	cr.line_to (5, 0)
+	cr.stroke ()
+end
+
+-- Register the symbol
+logdiag.register ("AND", names, area, terminals, render)
+
+
diff --git a/share/library/Logical/not.lua b/share/library/Logical/not.lua
new file mode 100644
index 0000000..94117be
--- /dev/null
+++ b/share/library/Logical/not.lua
@@ -0,0 +1,41 @@
+-- Symbol name
+names =
+{
+	en = "NOT",
+	cs = "NOT"
+}
+
+-- Render area in base units (X1, Y1, X2, Y2)
+area = {-4, -2, 4, 2}
+
+-- Terminals
+terminals = {{-4, 0}, {4, 0}}
+
+-- Rendering
+render = function (cr)
+	-- The triangle
+	cr.move_to (-2, -2)
+	cr.line_to (2, 0)
+	cr.line_to (-2, 2)
+	cr.close_path ()
+	cr.stroke ()
+
+	-- The circle
+	cr.new_sub_path ()
+	cr.arc (2.25, 0, 0.25, 0, 2 * math.pi)
+	cr.stroke ()
+
+	-- The contacts
+	cr.move_to (-4, 0)
+	cr.line_to (-2, 0)
+	cr.stroke ()
+
+	cr.move_to (2.5, 0)
+	cr.line_to (4, 0)
+	cr.stroke ()
+end
+
+-- Register the symbol
+logdiag.register ("NOT", names, area, terminals, render)
+
+
diff --git a/share/library/Logical/or.lua b/share/library/Logical/or.lua
new file mode 100644
index 0000000..b0f76fc
--- /dev/null
+++ b/share/library/Logical/or.lua
@@ -0,0 +1,55 @@
+-- Symbol name
+names =
+{
+	en = "OR",
+	cs = "OR"
+}
+
+-- Render area in base units (X1, Y1, X2, Y2)
+area = {-4, -2, 5, 2}
+
+-- Terminals
+terminals = {{-4, -1}, {-4, 1}, {5, 0}}
+
+-- Rendering
+render = function (cr)
+	-- The main shape
+	cr.move_to (-2, -2)
+	cr.line_to (0, -2)
+	cr.curve_to (2, -2, 3, 0, 3, 0)
+	cr.curve_to (3, 0, 2, 2, 0, 2)
+	cr.line_to (-2, 2)
+	cr.curve_to (-1, 1, -1, -1, -2, -2)
+	cr.stroke ()
+
+	-- The contacts
+	cr.save ()
+
+	-- Crop the contacts according to
+	-- the left side of the main shape
+	cr.move_to (-4, 2)
+	cr.line_to (-2, 2)
+	cr.curve_to (-1, 1, -1, -1, -2, -2)
+	cr.line_to (-4, -2)
+	cr.close_path ()
+	cr.clip ()
+
+	cr.move_to (-4, -1)
+	cr.line_to (-1, -1)
+	cr.stroke ()
+
+	cr.move_to (-4, 1)
+	cr.line_to (-1, 1)
+	cr.stroke ()
+
+	cr.restore ()
+
+	cr.move_to (3, 0)
+	cr.line_to (5, 0)
+	cr.stroke ()
+end
+
+-- Register the symbol
+logdiag.register ("OR", names, area, terminals, render)
+
+
-- 
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