JAVA-RGB-Mixer
Java Source:
//Copyright 2001 by Johannes Wallroth - www.programming.de
import java.applet.*;
import java.awt.*;
import java.net.*;
class Slider
{
public boolean over, drag, down;
private Rectangle r=new Rectangle();
private Graphics g;
public Color color;
public int x, y, y1, y2, pos, pos_old, height, value;
public Slider(int x, int y, Color color)
{
height=104;
this.x=x;
this.y=y;
pos=y+height/2;
this.color=color;
r.x=x-10;
r.y=pos-5;
r.width=22;
r.height=10;
}
public void reportMouseMove(int x, int y)
{
if(r.inside(x,y))
over=true;
else
over=false;
}
public void reportMouseDown(int x, int y)
{
if(r.inside(x,y))
{
down=true;
y1=y;
pos_old=pos;
}
}
public void reportMouseUp(int x, int y)
{
down=false;
}
public void reportMouseDrag(int x, int y)
{
if(down)
{
drag=true;
y2=y-y1;
pos=y2+pos_old;
if(pos<this.y+2)pos=this.y+2;
if(pos>this.y+height)pos=this.y+height;
r.move(r.x,pos-5);
}
else
drag=false;
}
private void drawSlider()
{
//the slot
g.setColor(Color.darkGray);
g.drawLine(x,y,x,y+height);
g.setColor(Color.gray);
g.drawLine(x-1,y,x-1,y+height);
g.setColor(Color.lightGray.brighter());
g.drawLine(x+1,y,x+1,y+height);
//draw the scale
g.setColor(Color.gray);
for(int i=y+1; i<y+104; i++)
{
if(i%2==0)
{
g.drawLine(x-10,i,x-5,i);
g.drawLine(x+10,i,x+5,i);
}
}
//the slider knob
g.setColor(Color.lightGray);
g.fill3DRect(x-10,pos-6,22,12,true);
g.fill3DRect(x-9,pos-5,20,10,true);
g.setColor(color);
g.fillRect(x-8,pos-1,18,2);
//the value
value=255-(((pos-y-2)/2)*5);
String valuestring=""+value;
//measure the size of the string to center it
Font font=new Font("Helvetica", Font.PLAIN, 12);
FontMetrics fm = g.getFontMetrics(font);
int stringWidth=fm.stringWidth(valuestring);
g.setFont(font);
g.setColor(Color.black);
g.drawString(valuestring, x-stringWidth/2, y-10);
}
public void paint(Graphics gr)
{
g=gr;
drawSlider();
}
public int getVal()
{
return value;
}
}
public class RGBMixer extends Applet
{
Image Buffer;
Graphics gBuffer;
URL url;
int h=35;
Slider sl1=new Slider(180,h,Color.red);
Slider sl2=new Slider(210,h,Color.green);
Slider sl3=new Slider(240,h,Color.blue);
//the hotlink
Rectangle r=new Rectangle(165,150,87,10);
boolean overLink;
public void update(Graphics g)
{
paint(g);
}
public void init()
{
Buffer=createImage(size().width,size().height);
gBuffer=Buffer.getGraphics();
try{url=new URL("http://www.programming.de/");}
catch(MalformedURLException mal){}
}
public void drawStuff() {
gBuffer.setColor(Color.lightGray);
gBuffer.fillRect(0,0,size().width,size().height);
gBuffer.draw3DRect(0,0,size().width-1,size().height-1,true);
gBuffer.draw3DRect(4,4,size().width-9,size().height-9,false);
gBuffer.draw3DRect(5,5,size().width-11,size().height-11,true);
gBuffer.draw3DRect(18,38,133,98,false);
sl1.paint(gBuffer);
sl2.paint(gBuffer);
sl3.paint(gBuffer);
Color mixColor=
new Color(sl1.getVal(),sl2.getVal(),sl3.getVal());
gBuffer.setColor(mixColor);
gBuffer.fillRect(20,40,130,95);
String red,green,blue;
red=sl1.getVal()<20?"0"+Integer.toHexString(sl1.getVal()):Integer.toHexString(sl1.getVal());
green=sl2.getVal()<20?"0"+Integer.toHexString(sl2.getVal()):Integer.toHexString(sl2.getVal());
blue=sl3.getVal()<20?"0"+Integer.toHexString(sl3.getVal()):Integer.toHexString(sl3.getVal());
String hex="color=\"#"+red+green+blue+"\"";
Font font=new Font("Helvetica", Font.PLAIN, 12);
gBuffer.setFont(font);
gBuffer.setColor(Color.black);
gBuffer.drawString(hex,45,25);
Font smallFont=new Font("Helvetica", Font.PLAIN, 9);
gBuffer.setFont(smallFont);
gBuffer.setColor(Color.gray);
gBuffer.drawString("©2001 by Johannes Wallroth",20,157);
gBuffer.setColor(Color.blue);
gBuffer.drawString("www.programming.de",165,157);
gBuffer.drawLine(165,158,251,158);
}
public boolean mouseMove(Event evt,int x,int y)
{
sl1.reportMouseMove(x, y);
sl2.reportMouseMove(x, y);
sl3.reportMouseMove(x, y);
if(r.inside(x,y))
overLink=true;
else
overLink=false;
Component ParentComponent = getParent();
while ( ParentComponent != null &&
!(ParentComponent instanceof Frame))
ParentComponent = ParentComponent.getParent();
Frame BrowserFrame = (Frame) ParentComponent;
if(overLink)
BrowserFrame.setCursor(Frame.HAND_CURSOR);
else
BrowserFrame.setCursor(Frame.DEFAULT_CURSOR);
repaint();
return true;
}
public boolean mouseDrag(Event evt,int x,int y)
{
sl1.reportMouseDrag(x, y);
sl2.reportMouseDrag(x, y);
sl3.reportMouseDrag(x, y);
repaint();
return true;
}
public boolean mouseDown(Event evt,int x,int y)
{
sl1.reportMouseDown(x, y);
sl2.reportMouseDown(x, y);
sl3.reportMouseDown(x, y);
if(overLink)
getAppletContext().showDocument(url,"_blank");
repaint();
return true;
}
public boolean mouseUp(Event evt,int x,int y)
{
sl1.reportMouseUp(x, y);
sl2.reportMouseUp(x, y);
sl3.reportMouseUp(x, y);
repaint();
return true;
}
public void paint(Graphics g)
{
drawStuff();
g.drawImage (Buffer,0,0, this);
}
}
Back to JAVA-RGB-Mixer
New on the Java Boutique:
New Review:
Time Management Made Easy with the Quartz Enterprise Job Scheduler
Why not just use the Java timer API? This open source scheduling
API boasts simplicity, ease-of-integration, a well-rounded feature
set, and it's free!
New Applet:
Reverse Complement
Reverse Complement is a simple applet that converts DNA or RNA
sequences into three useful formats.
Elsewhere on internet.com:
WebDeveloper Java
Lots of Java information on webdeveloper.com
WDVL Java
Thorough Java resource at the Web Developer's Virtual Library.
ScriptSearch Java
Hundreds of free Java code files to download.
jGuru: Your View of the Java Universe
Customizable portal with online training, FAQs, regular news updates, and tutorials.
