import keel.runtime.KeelRuntime;
import keel.runtime.Application;
import keel.gfx.GLGraphics;
import keel.gfx.GLConstants;
import keel.gfx.PixelFormat;
import keel.runtime.event.KeyListener;
import keel.runtime.event.KeyEvent;

public class OpenWindow implements Application
{
	private int width = 640;
	private int height = 480;
	
	public void keelMain(KeelRuntime keelRuntime, String[] args) {
		
		keelRuntime.addKeyListener(new DemoKeyListener(keelRuntime));
		keelRuntime.createWindow("your first KEEL program", 640, 480);
		keelRuntime.createGraphicsWithDefaultPixelFormat();
		
		keelRuntime.run();
		
		System.out.println("Never called.");
	}

	public void initGraphics(GLGraphics glGraphics) {
		glGraphics.glOrtho(0, width, 0, height, -1, 1);
		glGraphics.glScalef(1.0f, -1.0f, 1.0f);
		glGraphics.glTranslatef(0, -height, 0);
	}
	
	public void update(GLGraphics glGraphics) {
		glGraphics.glClear(GLConstants.GL_COLOR_BUFFER_BIT);
		drawTriangle(glGraphics);
		glGraphics.glFlush();
	}
	
	public void quitRequested() {
		
	}
	
	private void drawTriangle(GLGraphics glGraphics) {
		int topY = height / 3;
		int bottomY = (height / 3) * 2;
		int centerX = width / 2;
		int leftX = width / 3;
		int rightX = (width / 3) * 2;
		
		glGraphics.glBegin(GLConstants.GL_TRIANGLES);
		
		glGraphics.glColor3f(1.0f, 1.0f, 1.0f);
		
		glGraphics.glVertex2i(leftX, bottomY);
		glGraphics.glVertex2i(rightX, bottomY);
		glGraphics.glVertex2i(centerX, topY);
		
		glGraphics.glEnd();
	}

	class DemoKeyListener implements KeyListener {
		public DemoKeyListener(KeelRuntime aKeelRuntime) {
			keelRuntime = aKeelRuntime;
		}
	
		public void keyTyped(KeyEvent event) {
			System.out.println(event);
		}

		public void keyPressed(KeyEvent event) {
			System.out.println(event);
			if (event.getKeyCode() == KeyEvent.VK_Q) {
				keelRuntime.disposeDisplay();
				System.exit(0);
			}
		}

		public void keyReleased(KeyEvent event) {
			System.out.println(event);
		}

		private KeelRuntime keelRuntime;
	}
}