add drawImageRect to lua, update sample

samplecode/SampleLua.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleCode.h"
 #include "SkView.h"
 #include "SkLua.h"
 #include "SkCanvas.h"
 
 extern "C" {
 #include "lua.h"
 #include "lualib.h"
 #include "lauxlib.h"
 }
 
 static const char gDrawName[] = "onDrawContent";
 
 static const char gCode[] = ""
-    "require \"math\" "
-    ""
-    "local r = { left = 10, top = 10, right = 100, bottom = 80 } "
-    "local x = 0;"
-    ""
-    "local paint = Sk.newPaint();"
-    "paint:setAntiAlias(true);"
-    ""
-    "local image = Sk.loadImage('/skia/trunk/sailboat.jpg');"
-    ""
-    "local color = {a = 1, r = 1, g = 0, b = 0};"
-    ""
-    "function rnd(range) "
-    "   return math.random() * range;"
-    "end "
-    ""
-    "rndX = function () return rnd(640) end "
-    "rndY = function () return rnd(480) end "
-    ""
-    "function draw_rand_path(canvas);"
-    "   if not path_paint then "
-    "       path_paint = Sk.newPaint();"
-    "       path_paint:setAntiAlias(true);"
-    "   end "
-    "   path_paint:setColor({a = 1, r = math.random(), g = math.random(), b = math.random() });"
-    ""
-    "   local path = Sk.newPath();"
-    "   path:moveTo(rndX(), rndY());"
-    "   for i = 0, 50 do "
-    "       path:quadTo(rndX(), rndY(), rndX(), rndY());"
-    "   end "
-    "   canvas:drawPath(path, path_paint);"
-    ""
-    "   paint:setColor{a=1,r=0,g=0,b=1};"
-    "   local align = { 'left', 'center', 'right' };"
-    "   paint:setTextSize(30);"
-    "   for k, v in next, align do "
-    "       paint:setTextAlign(v);"
-    "       canvas:drawText('Hamburgefons', 320, 200 + 30*k, paint);"
-    "   end "
-    "end "
-    ""
-    "function onStartup() "
-    "   local paint = Sk.newPaint();"
-    "   paint:setColor{a=1, r=1, g=0, b=0};"
-    "   local doc = Sk.newDocumentPDF('/skia/trunk/test.pdf');"
-    "   local canvas = doc:beginPage(72*8.5, 72*11);"
-    "   canvas:drawText('Hello Lua', 300, 300, paint);"
-    "   doc:close();"
-    "   doc = nil;"
-    "end "
-    ""
-    "function onDrawContent(canvas) "
-    "   draw_rand_path(canvas);"
-    "   color.g = x / 100;"
-    "   paint:setColor(color) "
-    "   canvas:translate(x, 0);"
-    "   canvas:drawOval(r, paint) "
-    "   x = x + 1;"
-    "   canvas:drawImage(image, x, r.bottom + 50, 0.5);"
-    "   if x > 100 then x = 0 end;"
-    "end "
-    ""
-    "onStartup();";
+    "local r = { left = 10, top = 10, right = 100, bottom = 80 } \n"
+    "local x = 0;\n"
+    "\n"
+    "local paint = Sk.newPaint();\n"
+    "paint:setAntiAlias(true);\n"
+    "\n"
+    "local image = Sk.loadImage('/skia/sailboat.jpg');\n"
+    "\n"
+    "local color = {a = 1, r = 1, g = 0, b = 0};\n"
+    "\n"
+    "function rnd(range) \n"
+    "   return math.random() * range;\n"
+    "end \n"
+    "\n"
+    "rndX = function () return rnd(640) end \n"
+    "rndY = function () return rnd(480) end \n"
+    "\n"
+    "function draw_rand_path(canvas);\n"
+    "   if not path_paint then \n"
+    "       path_paint = Sk.newPaint();\n"
+    "       path_paint:setAntiAlias(true);\n"
+    "   end \n"
+    "   path_paint:setColor({a = 1, r = math.random(), g = math.random(), b = math.random() });\n"
+    "\n"
+    "   local path = Sk.newPath();\n"
+    "   path:moveTo(rndX(), rndY());\n"
+    "   for i = 0, 50 do \n"
+    "       path:quadTo(rndX(), rndY(), rndX(), rndY());\n"
+    "   end \n"
+    "   canvas:drawPath(path, path_paint);\n"
+    "\n"
+    "   paint:setColor{a=1,r=0,g=0,b=1};\n"
+    "   local align = { 'left', 'center', 'right' };\n"
+    "   paint:setTextSize(30);\n"
+    "   for k, v in next, align do \n"
+    "       paint:setTextAlign(v);\n"
+    "       canvas:drawText('Hamburgefons', 320, 200 + 30*k, paint);\n"
+    "   end \n"
+    "end \n"
+    "\n"
+    "function onStartup() \n"
+    "   local paint = Sk.newPaint();\n"
+    "   paint:setColor{a=1, r=1, g=0, b=0};\n"
+    "   local doc = Sk.newDocumentPDF('/skia/trunk/test.pdf');\n"
+    "   local canvas = doc:beginPage(72*8.5, 72*11);\n"
+    "   canvas:drawText('Hello Lua', 300, 300, paint);\n"
+    "   doc:close();\n"
+    "   doc = nil;\n"
+    "end \n"
+    "\n"
+    "function onDrawContent(canvas) \n"
+    "   draw_rand_path(canvas);\n"
+    "   color.g = x / 100;\n"
+    "   paint:setColor(color) \n"
+    "   canvas:translate(x, 0);\n"
+    "   canvas:drawOval(r, paint) \n"
+    "   x = x + 1;\n"
+    "   local r2 = {}\n"
+    "   r2.left = x;\n"
+    "   r2.top = r.bottom + 50;\n"
+    "   r2.right = r2.left + image:width() * 0.1;\n"
+    "   r2.bottom = r2.top + image:height() * 0.1;\n"
+    "   canvas:drawImageRect(image, nil, r2, 0.75);\n"
+    "   if x > 100 then x = 0 end;\n"
+    "end \n"
+    "\n"
+    "onStartup();\n";
 
 class LuaView : public SampleView {
 public:
     LuaView() : fLua(NULL) {}
 
     virtual ~LuaView() {
         SkDELETE(fLua);
     }
 
     lua_State* ensureLua() {
@@ skipping 49 matching lines @@
 private:
     SkLua* fLua;
 
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new LuaView; }
 static SkViewRegister reg(MyFactory);