import java.applet.Applet;
import java.awt.Graphics;

// must import jgl.GL....
import jgl.GL;
import jgl.GLAUX;

public class lines extends Applet {
    // must use GL to use jGL.....
    // and use GLAUX to use the aux functions.....
    // remember to give GL to initialize GLAUX
    GL myGL = new GL ();
    GLAUX myAUX = new GLAUX (myGL);

    private void drawOneLine (float x1, float y1, float x2, float y2) {
	myGL.glBegin (GL.GL_LINES);
	    myGL.glVertex2f (x1, y1);
	    myGL.glVertex2f (x2, y2);
	myGL.glEnd ();
    }

    private void display () {
	int i;

	myGL.glClear (GL.GL_COLOR_BUFFER_BIT);

	/* draw all lines in white */
	myGL.glColor3f (1.0f, 1.0f, 1.0f);

	/* in 1st row, 3 lines, each with a different stipple */
	myGL.glEnable (GL.GL_LINE_STIPPLE);
	myGL.glLineStipple (1, (short)0x0101);	/* dotted */
	drawOneLine (50.0f, 125.0f, 150.0f, 125.0f);
	myGL.glLineStipple (1, (short)0x00FF);	/* dashed */
	drawOneLine (150.0f, 125.0f, 250.0f, 125.0f);
	myGL.glLineStipple (1, (short)0x1C47);	/* dash/dot/dash */
	drawOneLine (250.0f, 125.0f, 350.0f, 125.0f);

	/* in 2nd row, 3 width lines, each with different stipple */
	myGL.glLineWidth (5.0f);
	myGL.glLineStipple (1, (short)0x0101);
	drawOneLine (50.0f, 100.0f, 150.0f, 100.0f);
	myGL.glLineStipple (1, (short)0x00FF);
	drawOneLine (150.0f, 100.0f, 250.0f, 100.0f);
	myGL.glLineStipple (1, (short)0x1C47);
	drawOneLine (250.0f, 100.0f, 350.0f, 100.0f);
	myGL.glLineWidth (1.0f);

	/* in 3rd row, 6 lines, with dash/dot/dash stipple, */
	/* as part of a single connected line strip */
	myGL.glLineStipple (1, (short)0x1C47);
	myGL.glBegin (GL.GL_LINE_STRIP);
	for (i = 0; i < 7; i++) {
	    myGL.glVertex2f (50.0f + ((float)i * 50.0f), 75.0f);
	}
	myGL.glEnd ();

	/* in 4th row, 6 independent lines, */
	/* with dash/dot/dash stipple */
	for (i = 0; i < 6; i++) {
	    drawOneLine (50.0f + ((float)i * 50.0f), 50.0f,
			 50.0f + ((float)(i + 1) * 50.0f), 50.0f);
	}

	/* in 5th row, 1 line, with dash/dot/dash stipple */
	/* and repeat factor of 5 */
	myGL.glLineStipple (1, (short)0x1C47);
	drawOneLine (50.0f, 25.0f, 350.0f, 25.0f);

	myGL.glFlush ();
    }

    private void myinit () {
	/* background to be cleared to black */
	myGL.glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
	myGL.glShadeModel (GL.GL_FLAT);
    }

    public void update (Graphics g) {
    	// skip the clear screen command....
	paint (g);
    }

    public void paint (Graphics g) {
	myGL.glXSwapBuffers (g, this);
    }

    public void init () {
	myAUX.auxInitPosition (0, 0, 400, 150);
	myAUX.auxInitWindow (this);
	myinit ();

        // call display as call auxIdleFunc(display)
	display ();
    }

}