updated documentation - added handler / callback prototype section, added key names section; added ag::drawArc() and ag::drawCircle() w/ documentation; added tests/transparent.png and tests/imagetest.lua; renamed init() event to init_event(); re-added missing drawImage Lua hook; changed images to draw transparent parts correctly through to background

git-svn-id: svn://anubis/anaglym/trunk@197 99a6e188-d820-4881-8870-2d33a10e2619

lib/std.lua

@@ -43,3 +43,23 @@ std.createPlanePointNormal = function(x, y, z, nx, ny, nz)
     -- invoke the ag routine to create a plane based on a, b, c, d parameters
     return ag.createPlane(nx, ny, nz, nx * x, ny * y, nz * z)
 end
+
+-- Convert screen percent to pixel count along X axis
+-- Input:
+--   percent: percent (0.0 - 1.0) of the screen's X axis
+-- Output:
+--   Number of pixels corresponding to 'percent' percent of the X axis
+std.pctx = function(percent)
+    local width = ag.getScreenSize()
+    return width * percent
+end
+
+-- Convert screen percent to pixel count along Y axis
+-- Input:
+--   percent: percent (0.0 - 1.0) of the screen's Y axis
+-- Output:
+--   Number of pixels corresponding to 'percent' percent of the Y axis
+std.pcty = function(percent)
+    local width, height = ag.getScreenSize()
+    return height * percent
+end