Applet with parameters
//File: applet.html
/*
<applet code="ColorScribble.class"
codebase="."
width=400 height=400>
<param name="foreground" value="FF0000">
<param name="background" value="CCFFCC">
</applet>
*/
/*
* Copyright (c) 2000 David Flanagan. All rights reserved.
* This code is from the book Java Examples in a Nutshell, 2nd Edition.
* It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
* You may study, use, and modify it for any non-commercial purpose.
* You may distribute it non-commercially as long as you retain this notice.
* For a commercial use license, or to purchase the book (recommended),
* visit http://www.davidflanagan.com/javaexamples2.
*/
import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
/**
* A version of the Scribble applet that reads two applet parameters to set the
* foreground and background colors. It also returns information about itself
* when queried.
*/
public class ColorScribble extends Applet{
// Read in two color parameters and set the colors.
public void init() {
Color foreground = getColorParameter("foreground");
Color background = getColorParameter("background");
if (foreground != null)
this.setForeground(foreground);
if (background != null)
this.setBackground(background);
}
public void paint(Graphics g) {
g.setColor(getForeground());
g.drawString("Parameter",10, 10 );
}
// Read the specified parameter. Interpret it as a hexadecimal
// number of the form RRGGBB and convert it to a color.
protected Color getColorParameter(String name) {
String value = this.getParameter(name);
try {
return new Color(Integer.parseInt(value, 16));
} catch (Exception e) {
return null;
}
}
// Return information suitable for display in an About dialog box.
public String getAppletInfo() {
return "ColorScribble v. 0.03. Written by David Flanagan.";
}
// Return info about the supported parameters. Web browsers and applet
// viewers should display this information, and may also allow users to
// set the parameter values.
public String[][] getParameterInfo() {
return info;
}
// Here's the information that getParameterInfo() returns.
// It is an array of arrays of strings describing each parameter.
// Format: parameter name, parameter type, parameter description
private String[][] info = {
{ "foreground", "hexadecimal color value", "foreground color" },
{ "background", "hexadecimal color value", "background color" } };
}
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