reed@google.com | 3597b73 | 2013-05-22 20:12:50 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2013 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "SampleCode.h" |
| 9 | #include "SkView.h" |
| 10 | #include "SkLua.h" |
| 11 | #include "SkCanvas.h" |
| 12 | |
| 13 | extern "C" { |
| 14 | #include "lua.h" |
| 15 | #include "lualib.h" |
| 16 | #include "lauxlib.h" |
| 17 | } |
| 18 | |
| 19 | static const char gDrawName[] = "onDrawContent"; |
| 20 | |
| 21 | static const char gCode[] = "" |
| 22 | "local r = { left = 10, top = 10, right = 100, bottom = 80 } " |
| 23 | "local x = 0;" |
| 24 | "" |
| 25 | "local paint = Sk.newPaint();" |
| 26 | "paint:setAntiAlias(true);" |
| 27 | "" |
| 28 | "local color = {a = 1, r = 1, g = 0, b = 0};" |
| 29 | "" |
| 30 | "function onDrawContent(canvas) " |
| 31 | " color.g = x / 100;" |
| 32 | " paint:setColor(color) " |
| 33 | " canvas:translate(x, 0);" |
| 34 | " canvas:drawOval(r, paint) " |
| 35 | " x = x + 1;" |
| 36 | " if x > 100 then x = 0 end;" |
| 37 | "end"; |
| 38 | |
| 39 | class LuaView : public SampleView { |
| 40 | public: |
| 41 | LuaView() : fLua(NULL) {} |
| 42 | |
| 43 | virtual ~LuaView() { |
| 44 | SkDELETE(fLua); |
| 45 | } |
| 46 | |
| 47 | lua_State* ensureLua() { |
| 48 | if (NULL == fLua) { |
| 49 | fLua = SkNEW(SkLua); |
| 50 | fLua->runCode(gCode); |
| 51 | } |
| 52 | return fLua->get(); |
| 53 | } |
| 54 | |
| 55 | protected: |
| 56 | virtual bool onQuery(SkEvent* evt) SK_OVERRIDE { |
| 57 | if (SampleCode::TitleQ(*evt)) { |
| 58 | SampleCode::TitleR(evt, "Lua"); |
| 59 | return true; |
| 60 | } |
| 61 | SkUnichar uni; |
| 62 | if (SampleCode::CharQ(*evt, &uni)) { |
| 63 | switch (uni) { |
| 64 | default: |
| 65 | break; |
| 66 | } |
| 67 | } |
| 68 | return this->INHERITED::onQuery(evt); |
| 69 | } |
| 70 | |
| 71 | virtual void onDrawContent(SkCanvas* canvas) SK_OVERRIDE { |
| 72 | lua_State* L = this->ensureLua(); |
| 73 | |
| 74 | lua_getglobal(L, gDrawName); |
| 75 | if (!lua_isfunction(L, -1)) { |
| 76 | int t = lua_type(L, -1); |
| 77 | SkDebugf("--- expected %s function %d, ignoring.\n", gDrawName, t); |
| 78 | lua_pop(L, 1); |
| 79 | } else { |
| 80 | // does it make sense to try to "cache" the lua version of this |
| 81 | // canvas between draws? |
| 82 | fLua->pushCanvas(canvas); |
| 83 | if (lua_pcall(L, 1, 0, 0) != LUA_OK) { |
| 84 | SkDebugf("lua err: %s\n", lua_tostring(L, -1)); |
| 85 | } |
| 86 | } |
| 87 | // need a way for the lua-sample to tell us if they want animations... |
| 88 | // hard-code it ON for now. |
| 89 | this->inval(NULL); |
| 90 | } |
| 91 | |
| 92 | virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, |
| 93 | unsigned modi) SK_OVERRIDE { |
| 94 | return this->INHERITED::onFindClickHandler(x, y, modi); |
| 95 | } |
| 96 | |
| 97 | virtual bool onClick(Click* click) SK_OVERRIDE { |
| 98 | return this->INHERITED::onClick(click); |
| 99 | } |
| 100 | |
| 101 | private: |
| 102 | SkLua* fLua; |
| 103 | |
| 104 | typedef SampleView INHERITED; |
| 105 | }; |
| 106 | |
| 107 | ////////////////////////////////////////////////////////////////////////////// |
| 108 | |
| 109 | static SkView* MyFactory() { return new LuaView; } |
| 110 | static SkViewRegister reg(MyFactory); |