File: java1.java

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// Program 11.6: A nicer sine wave
import java.applet.Applet;    
import java.awt.Graphics; 

public class SineApplet2 extends Applet {

	public void paint(Graphics g) {

		int i, j1, j2;

		j1 = yvalue(0);
		for (i = 0; i < size().width; i++) {
			j2 = yvalue(i+1);
			g.drawLine(i, j1 ,i+1, j2);
			j1 = j2;
		}

	}

	// Given the  xpoint we're given calculate the Cartesian equivalent
	private int yvalue(int ivalue)  {

		double xmin = -10.0;
		double xmax =  10.0;
		double ymin = -1.0;
		double ymax =  1.0;
		double x, y;
		int jvalue;

		x = (ivalue * (xmax - xmin)/(size().width - 1)) + xmin;

		// Take the sine of that x 
		y = Math.sin(x);

		// Scale y into window coordinates
		jvalue = (int) ((y - ymin)*(size().height - 1)/
				(ymax - ymin));

		/* Switch jvalue from Cartesian coordinates 
			 to computer graphics coordinates */   
		jvalue = size().height - jvalue;

		return jvalue;

	}

}