kayaknya selama ini gw belum pernah nge-post sesuatu yg isi nya soal kuliah ato pendidikan ya,,!!
nah ini sedikit aja gw kasih coding dengan bahasa JAVA untuk pembuatan gradien color dalan canvas :
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class CanvasForm extends MIDlet implements CommandListener {
private Display display;
private Form form;
private Displayable current;
private TextField one,two;
private StringItem item;
private long result;
private Command quit,add;
private CanvasClass canvas;
int first=0,second=0;
public CanvasForm(){
form=new Form("Calculator");
one=new TextField(null,"10000002",8,TextField.NUMERIC);
two=new TextField(null,"10000003",8,TextField.NUMERIC);
item=new StringItem("Result","");
quit=new Command("Quit", Command.EXIT,0);
add=new Command("Add", Command.SCREEN,0);
form.append(one);
form.append(two);
form.append(item);
form.addCommand(add);
form.addCommand(quit);
form.setCommandListener(this);
}
public void startApp() {
display=Display.getDisplay(this);
if(current!=null){
display.setCurrent(current);
}
else{
display.setCurrent(form);
current=form;
}
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
}
private void calculate(){
try{
first=Integer.parseInt(one.getString());
second=Integer.parseInt(two.getString());
result=first+second;
item.setText(result+" ");
}catch(NumberFormatException e){
item.setText("unknown");
e.printStackTrace();
}
}
public void commandAction(Command c, Displayable s){
if(c==quit){
notifyDestroyed();
return;
}
calculate();
if(canvas==null)
canvas=new CanvasClass();
current=canvas;
display.setCurrent(canvas);
}
class CanvasClass extends Canvas implements CommandListener{
CanvasClass(){
this.addCommand(new Command("Back",Command.BACK,0));
this.setCommandListener(this);
}
protected void paint(Graphics g){
int w=getWidth();
int h=getHeight();
g.setColor(244,244,244);
g.fillRect(0,0,w,h);
g.setGrayScale(12*14);
h=Math.min(w,h);
long mf=100000000;
int angle=(int)(((first*(36000*mf/result))+50*mf)/(100*mf));
int origin=180;
g.fillArc(0, 0, h, h, origin, (int)angle);
g.setGrayScale(13*16);
g.fillArc(0,0,h,h, (int)(origin+angle),(int)(360-angle));
g.setColor(123);
g.drawString(" A = "+first, h/2, h/2-10, Graphics.BASELINE|Graphics.RIGHT);
g.drawString(" B = "+second, h/2, h/2-10, Graphics.BASELINE|Graphics.LEFT);
g.drawString(" Total = "+(first+second), h/2, h/2, Graphics.TOP|Graphics.HCENTER);
}
public void commandAction(Command c, Displayable d){
current=form;
display.setCurrent(form);
}
}
}
setelah di compile lalu di jalankan, output yg dikeluarkan adalah seperti ini :
nah,,, kira-kira seperti itu,,,
selamat mencoba,,,,,,
