public void drawPlot() throws ScriptException {
double x1, y1, x2, y2;
String functionName = getFunctionName();
for (int i = -width; i < width; i++) {
x1 = i / zoom;
x2 = (i + 1) / zoom;
y1 = compute.getFunctionValue(x1, functionName);
y2 = compute.getFunctionValue(x2, functionName);
g2.draw(new Line2D.Double((x1 * zoom), (-y1 * zoom), (x2 * zoom), (-y2 * zoom)));
}
}
