让Engine类处理循环
上一篇成功创建了窗口，但是循环内的工作在每次创建新程序时仍要重写，很麻烦。
故将循环的工作交给Engine来处理。
先来梳理一下循环内要做什么。
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| while(running) {
input();
update();
render();
}
|
Engine还要负责init()部分的工作。
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| [imports ...]
public class Engine {
static Window.Settings settings;
public static void init(Window.Settings settings) {
Engine.settings = settings;
Window.settings = settings;
}
public static void init() {
Engine.settings = new Window.Settings();
settings.setTitle("Game")
.setWidth(800)
.setHeight(600)
.setColor(0, 0, 0, 255);
Window.settings = settings;
}
public void run() {
Window.createWindow(settings);
Window.setWindowVisible();
long lastTime = System.currentTimeMillis();
int frames = 0;
while(!Window.windowShouldClose()) {
Window.pollEvents();
Window.update();
++frames;
while(System.currentTimeMillis() >= lastTime + 1000L) {
System.out.println(frames + " fps");
lastTime += 1000L;
frames = 0;
}
}
cleanup();
}
private void cleanup() {
Window.cleanup();
}
}
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现在测试一下Engine类。
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| [imports ...]
public class TestEngine {
public static void main(String[] args) {
Engine.init();
Window.settings.setTitle("Test Engine")
.setVsync(true);
new Engine().run();
}
}
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input()的工作，通过ILogic实现。
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| public interface ILogic {
void input();
}
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然后在Engine中添加ILogic。
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| public static ILogic logic;
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| public static void init(Window.Settings settings, ILogic logic) {
[...]
Engine.logic = logic;
}
public static void init() {
[...]
logic = new ILogic() {
@Override
public void input() {}
};
}
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在循环中调用input()。
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| public void run() {
[...]
while(!Window.windowShouldClose()) {
[...]
logic.input();
Window.update();
[...]
}
[...]
}
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现在测试一下ILogic。
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| [imports ...]
public class TestLogic implements ILogic {
@Override
public void input() {
if (Window.isKeyPressed(GLFW.GLFW_KEY_SPACE))
System.out.println("Space is pressed");
}
}
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| [imports ...]
public class TestEngine {
public static void main(String[] args) {
Engine.init();
Window.settings.setTitle("Test Logic")
.setVsync(true);
Engine.logic = new TestLogic();
new Engine().run();
}
}
|
