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/*
* 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();";
class LuaView : public SampleView {
public:
LuaView() : fLua(NULL) {}
virtual ~LuaView() {
SkDELETE(fLua);
}
lua_State* ensureLua() {
if (NULL == fLua) {
fLua = SkNEW(SkLua);
fLua->runCode(gCode);
}
return fLua->get();
}
protected:
virtual bool onQuery(SkEvent* evt) SK_OVERRIDE {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Lua");
return true;
}
SkUnichar uni;
if (SampleCode::CharQ(*evt, &uni)) {
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
lua_State* L = this->ensureLua();
lua_getglobal(L, gDrawName);
if (!lua_isfunction(L, -1)) {
int t = lua_type(L, -1);
SkDebugf("--- expected %s function %d, ignoring.\n", gDrawName, t);
lua_pop(L, 1);
} else {
// does it make sense to try to "cache" the lua version of this
// canvas between draws?
fLua->pushCanvas(canvas);
if (lua_pcall(L, 1, 0, 0) != LUA_OK) {
SkDebugf("lua err: %s\n", lua_tostring(L, -1));
}
}
// need a way for the lua-sample to tell us if they want animations...
// hard-code it ON for now.
this->inval(NULL);
}
virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y,
unsigned modi) SK_OVERRIDE {
return this->INHERITED::onFindClickHandler(x, y, modi);
}
virtual bool onClick(Click* click) SK_OVERRIDE {
return this->INHERITED::onClick(click);
}
private:
SkLua* fLua;
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new LuaView; }
static SkViewRegister reg(MyFactory);
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