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import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class GraphDisplayScrollbars extends Applet implements AdjustmentListener{
int height = 250;
int width = 300;

int leftMargin = 40;
int rightMargin = 40;
int topMargin = 40;
int bottomMargin = 40;

double xmin = 0;
double xmax = 10;
double ymin = -10;
double ymax = 10;

double a;
double b;
double c;
double d;

private Scrollbar sliderA;
private int sliderAValue = 0;

private Scrollbar sliderB;
private int sliderBValue = 0;

private Scrollbar sliderC;
private int sliderCValue = 0;

private Scrollbar sliderD;
private int sliderDValue = 0;

public void init() {

Label A, B, C, D;

A = new Label("A");
add(A);
sliderA = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, 0, 50);
add(sliderA);
sliderA.addAdjustmentListener(this);

B = new Label("B");
add(B);
sliderB = new Scrollbar(Scrollbar.VERTICAL, 0, 1 0, 50);
add(sliderB);
sliderB.addAdjustmentListener(this);

C = new Label("C");
add(C);
sliderC = new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 50);
add(sliderC);
sliderC.addAdjustmentListener(this);

D = new Label ("D");
add(D);
sliderD = new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 100);
add(sliderD);
sliderD.addAdjustmentListener(this);
}

public void paint(Graphics g) {
g.drawLine(scaleX(xmin), scaleY(ymin), scaleX(xmax), scaleY(ymin));
g.drawLine(scaleX(xmin), scaleY(ymin), scaleX(xmin), scaleY(ymax));
g.drawString(" A = " + sliderAValue, 50, 240);
g.drawString(" B = " + sliderBValue, 70, 240);
g.drawString(" C = " + sliderCValue, 90, 240);
g.drawString(" D = " + sliderDValue, 110, 240);
double x, y;
double xlast = xmin;
double ylast = funct(xmin, a, b, c, d);

for (int i=0; i<100; i++){
x = xmin + i*(xmax-xmin)/100.0;
y = funct(x, a, b, c, d);
if (x >= xmin && x <=xmax && y >= ymin && y <= ymax) {
g.drawLine(scaleX(xlast), scaleY(ylast), scaleX(x), scaleY(y));
}
xlast = x;
ylast = y;
}
}
private int scaleX(double x) {
double xRange = xmax - xmin;
int pixelRange = width - leftMargin - rightMargin;
int pixelX = leftMargin + (int) Math.round ((x-xmin)*pixelRange/xRange);
return pixelX;
}
private int scaleY(double y) {
double yRange = ymax - ymin;
int pixelRange = height - topMargin - bottomMargin;
int pixelY = topMargin + (int) Math.round((ymax - y)*pixelRange/yRange);
return pixelY;
}
private double funct(double x, double a, double b, double c, double d){
return a + x*b + Math.pow(x,2)*c + Math.pow(x,3)*d;
}
public void adjustmentValueChanged(AdjustmentEvent e) {
sliderAValue = sliderA.getValue();
sliderBValue = sliderB.getValue();
sliderCValue = sliderC.getValue();
sliderDValue = sliderD.getValue();
repaint();
}
}

Compiling GraphDisplayScrollbars.java...
GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

GraphDisplayScrollbars.java:42: illegal character: \160



^

11 errors

Done.

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:41: illegal character: \160

add(A);

^

Graph1.java:60: illegal character: \160

sliderD = new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 100);

^

Graph1.java:60: ')' expected

sliderD = new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 100);

^

Graph1.java:5: class GraphDisplayScrollbars is public, should be declared in a file named GraphDisplayScrollbars.java

public class GraphDisplayScrollbars extends Applet implements AdjustmentListener{

^

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