第九課 SDL計時器

這一課主要講sdl的乙個ticket的應用，基本的例子就是計時器的應用，沒有什麼很複雜的東西，在上一課基礎上就是加入了sdl_getticks的應用而已。

這個是乙個計時器的乙個類

timer.h

#ifndef timer_h

#define timer_h
/** 計時器
**/class timer ;
#endif

timer.cpp

#include "timer.h"

#ifdef __cplusplus
extern "c" 
#endif
timer::timer()
: mstartticks(0), mpausedticks(0), mstarted(false), mpaused(false)
void timer::start()
void timer::stop()
void timer::pause()
}void timer::unpause()
}int timer::restart()
int timer::ticks() const 
return 0;
}bool timer::started() const 
bool timer::paused() const

sdl關於window的乙個封裝

window08.h

#ifndef window_h

#define window_h
#include #include #include #ifdef __cplusplus
extern "c" 
#endif
/** sdl window的封住
*/class window08 ;
#endif

window08.cpp

#include #include #include #include "window08.h"

#ifdef __cplusplus
extern "c" 
#endif
//initialize the unique_ptr's deleters here
std::unique_ptrwindow08::mwindow
= std::unique_ptr(nullptr, sdl_destroywindow);
std::unique_ptrwindow08::mrenderer
= std::unique_ptr(nullptr, sdl_destroyrenderer);
sdl_rect window08::mbox;
window08::window08()
window08::~window08()
void window08::init(std::string title)
void window08::quit()
void window08::draw(sdl_texture *tex, sdl_rect &dstrect, sdl_rect *clip, float angle,
int xpivot, int ypivot, sdl_rendererflip flip)
; //繪製
sdl_rendercopyex(mrenderer.get(), tex, clip, &dstrect, angle, &pivot, flip);
}sdl_texture* window08::loadimage(const std::string &file)
sdl_texture* window08::rendertext(const std::string &message, const std::string &fontfile, sdl_color color, int fontsize)
void window08::clear()
void window08::present()
sdl_rect window08::box()

lesson08.cpp

#include #include #include #include #include "lesson08.h"

#include "window08.h"
#include "timer.h"
clesson08::clesson08()
clesson08::~clesson08()
int clesson08::run(int argc, char* argv)
catch (const std::runtime_error &e)
std::string path(argv[1]);
std::string filepath=path + "sourcesanspro-regular.ttf";
//定時器
timer timer;
//textures的建立
sdl_texture *msg = nullptr, *ticks = nullptr;
//文字的顏色
sdl_color white = ;
//文字大小
sdl_rect msgbox, ticksbox;
filepath=path + "sourcesanspro-regular.ttf";
msg = window08::rendertext("計時器（s開始/停止，p(暫停/更新): ", filepath, white, 30);
//setup msg dstrect
msgbox.x = 0;
msgbox.y = window08::box().h / 2;
//query w & h from texture
sdl_querytexture(msg, null, null, &msgbox.w, &msgbox.h);
//setup ticks message
//we must use a stringstream to convert int to string
std::stringstream ssticks;
ssticks << timer.ticks();
ticks = window08::rendertext(ssticks.str(), filepath, white, 30);
//clear the stream
ssticks.str("");
//setup the ticks dstrect
ticksbox.x = msgbox.w + 20;
ticksbox.y = window08::box().h / 2;
sdl_querytexture(ticks, null, null, &ticksbox.w, &ticksbox.h);
//our event structure
sdl_event e;
//for tracking if we want to quit
bool quit = false;
while (!quit)
}} //logic
//if the timer is running, update the ticks message
if (timer.started() && !timer.paused())
//rendering
window08::clear();
window08::draw(msg, msgbox);
window08::draw(ticks, ticksbox);
window08::present();
}sdl_destroytexture(msg);
sdl_destroytexture(ticks);
window08::quit();
return 0;
}

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