void drawFunction(Graphics g) {
// Just plot 301 points with lines between them.
double x, y;
double prevx, prevy;
double dx;
int totalX = (int) (Xmax + ((-1) * Xmin));
dx = totalX / 300.0;
g.setColor(Color.red);
x = Xmin;
y = funct.equation(x);
/* Compute each of the other 300 points, and draw a line segment
between each consecutive pair of points. Note that if the function
is undefined at one of the points in a pair, then the line
segment is not drawn. */
for (int i = 1; i <= 300; i++) {
prevx = x; // Save the coords of the previous point.
prevy = y;
x += dx; // Get the coords of the next point.
y = funct.equation(x);
if ((!Double.isNaN(y)) && (!Double.isNaN(prevy))) {
// Draw a line segment between the two points.
putLine(g, prevx, prevy, x, y);
}
}
}
