/*
  iアプリ, MIDP での円弧の描画. 拡張 API または三角関数の数表
  Time-stamp: "2003/11/13 Thu 19:16  hig"
  Saburo Higuchi 2003  http://www.math.ryukoku.ac.jp/~hig/
  プログラム解説等
  http://sparrow.math.ryukoku.ac.jp/~hig/course/juniors_2003/07/
 */

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

/**
   IApplication または MIDlet を継承するクラス
 */
public class ArcSample extends MIDlet  {

    /** 起動するときに呼ばれる メソッド. 必須. */

    public void startApp(){
	ArcCanvas cc = new ArcCanvas(this);
	Display.getDisplay(this).setCurrent(cc);
    }

    public void pauseApp(){}
    public void destroyApp(boolean unconditional){}

}

class ArcCanvas extends Canvas implements Runnable{

    MIDlet  parent;
    int radius;
    int theta=0;

    Graphics offgr;
    Image offimg;

    ArcCanvas(MIDlet  parent){
	this.parent=parent;

	radius=getHeight()/2;
	if( radius > getWidth()/2 ){
	    radius=getWidth()/2;
	}

	Thread th = new Thread(this);
	th.start();
    }

    public void paint(Graphics g){

	// 画面をいったん固定(ダブルバッファリング)
	// offimg=Image.createImage(getWidth(),getHeight());//midp
	// offgr=offimg.getGraphics(); // midp
	// 最後の drawImage とペアでアンコメントし,
	// 下の g. を offgr. としてみよう.

	g.setColor(( (255<<16) + (255<<8) + (255)) );
	g.fillRect(0,0,getWidth(),getHeight()); // 画面を消す
	g.setColor(0 );

	// 数表による円弧
	for(int i=0; i < theta ; i+=5){
	    /* (x1,y1) と (x2,y2) の間に線分をひく */
	    g.drawLine( radius + (radius * cos(i)) /magfactor,//x1
			radius - (radius * sin(i)) /magfactor,//y1
			radius + (radius * cos(i+5)) /magfactor,//x2
			radius - (radius * sin(i+5)) /magfactor//y2
			);
	    /*
	    g.drawLine( radius + radius * (cos(i) /magfactor) ,//x1
			radius - radius * (sin(i) /magfactor) ,//y1
			radius + radius * (cos(i+5) /magfactor),//x2
			radius - radius * (sin(i+5))/magfactor) //y2
			);
			だとどうなるかな
	    */

	}

	g.fillRect(radius + (radius * cos(theta)) / magfactor,
		   radius - (radius * sin(theta)) / magfactor,
		   4,4);

	// DoJa3.0 または MIDP ならアンコメントしてみよう.
	g.setColor(( (255<<16) + (0<<8) + (0)) );
	g.drawArc(radius/2,radius/2,radius,radius,0,theta);

	//画面を一括表示(ダブルバッファリング終了)
	// g.drawImage(offimg,0,0,g.LEFT|g.TOP);

    }

    /** スレッドが start されると このメソッドに制御が移る */
    public void run(){
	while(true){ // 無限ループ
	    theta=(theta+10) % period;	// 角度を進め
	    repaint();		// paint() を再度呼び出す.

	    try {
		Thread.sleep(100); // 100ミリ秒休む.
	    } catch ( Exception e ) {
		// 割り込みがあっても何もしない.
	    }
	    repaint();
	}
    }

// Vodafone の場合, FixedPoint クラスの中で sin, cos などは提供されている.
    int sin(int n){
	while( n<0 ){
	    n+=period;
	}
	return sin[n%period];
    }
    
    int cos(int n){
	while( n<0 ){
	    n+=period;
	}
	return cos[n%period];
    }

    /** 2pi に相当する 度 */
    private final int period=360; 

    /** 分母 */
    private final int magfactor=100000;

// 100000.0*sin(n度) を長さ 360 の整数配列にしたもの
// 本当は, sin の始め90個から sin, cos すべてを簡単に計算できるはず.
    private final int sin[]={
    0,1745,3489,5233,6975,8715,10452,12186,13917,15643,
    17364,19080,20791,22495,24192,25881,27563,29237,30901,32556,
    34202,35836,37460,39073,40673,42261,43837,45399,46947,48480,
    49999,51503,52991,54463,55919,57357,58778,60181,61566,62932,
    64278,65605,66913,68199,69465,70710,71933,73135,74314,75470,
    76604,77714,78801,79863,80901,81915,82903,83867,84804,85716,
    86602,87461,88294,89100,89879,90630,91354,92050,92718,93358,
    93969,94551,95105,95630,96126,96592,97029,97437,97814,98162,
    98480,98768,99026,99254,99452,99619,99756,99862,99939,99984,
    100000,99984,99939,99862,99756,99619,99452,99254,99026,98768,
    98480,98162,97814,97437,97029,96592,96126,95630,95105,94551,
    93969,93358,92718,92050,91354,90630,89879,89100,88294,87461,
    86602,85716,84804,83867,82903,81915,80901,79863,78801,77714,
    76604,75470,74314,73135,71933,70710,69465,68199,66913,65605,
    64278,62932,61566,60181,58778,57357,55919,54463,52991,51503,
    49999,48480,46947,45399,43837,42261,40673,39073,37460,35836,
    34202,32556,30901,29237,27563,25881,24192,22495,20791,19080,
    17364,15643,13917,12186,10452,8715,6975,5233,3489,1745,
    0,-1745,-3489,-5233,-6975,-8715,-10452,-12186,-13917,-15643,
    -17364,-19080,-20791,-22495,-24192,-25881,-27563,-29237,-30901,-32556,
    -34202,-35836,-37460,-39073,-40673,-42261,-43837,-45399,-46947,-48480,
    -50000,-51503,-52991,-54463,-55919,-57357,-58778,-60181,-61566,-62932,
    -64278,-65605,-66913,-68199,-69465,-70710,-71933,-73135,-74314,-75470,
    -76604,-77714,-78801,-79863,-80901,-81915,-82903,-83867,-84804,-85716,
    -86602,-87461,-88294,-89100,-89879,-90630,-91354,-92050,-92718,-93358,
    -93969,-94551,-95105,-95630,-96126,-96592,-97029,-97437,-97814,-98162,
    -98480,-98768,-99026,-99254,-99452,-99619,-99756,-99862,-99939,-99984,
    -100000,-99984,-99939,-99862,-99756,-99619,-99452,-99254,-99026,-98768,
    -98480,-98162,-97814,-97437,-97029,-96592,-96126,-95630,-95105,-94551,
    -93969,-93358,-92718,-92050,-91354,-90630,-89879,-89100,-88294,-87461,
    -86602,-85716,-84804,-83867,-82903,-81915,-80901,-79863,-78801,-77714,
    -76604,-75470,-74314,-73135,-71933,-70710,-69465,-68199,-66913,-65605,
    -64278,-62932,-61566,-60181,-58778,-57357,-55919,-54463,-52991,-51503,
    -50000,-48480,-46947,-45399,-43837,-42261,-40673,-39073,-37460,-35836,
    -34202,-32556,-30901,-29237,-27563,-25881,-24192,-22495,-20791,-19080,
    -17364,-15643,-13917,-12186,-10452,-8715,-6975,-5233,-3489,-1745};
// 100000.0*cos(n度) を長さ 360 の整数配列にしたもの
    private final int cos[]={
    100000,99984,99939,99862,99756,99619,99452,99254,99026,98768,
    98480,98162,97814,97437,97029,96592,96126,95630,95105,94551,
    93969,93358,92718,92050,91354,90630,89879,89100,88294,87461,
    86602,85716,84804,83867,82903,81915,80901,79863,78801,77714,
    76604,75470,74314,73135,71933,70710,69465,68199,66913,65605,
    64278,62932,61566,60181,58778,57357,55919,54463,52991,51503,
    50000,48480,46947,45399,43837,42261,40673,39073,37460,35836,
    34202,32556,30901,29237,27563,25881,24192,22495,20791,19080,
    17364,15643,13917,12186,10452,8715,6975,5233,3489,1745,
    0,-1745,-3489,-5233,-6975,-8715,-10452,-12186,-13917,-15643,
    -17364,-19080,-20791,-22495,-24192,-25881,-27563,-29237,-30901,-32556,
    -34202,-35836,-37460,-39073,-40673,-42261,-43837,-45399,-46947,-48480,
    -49999,-51503,-52991,-54463,-55919,-57357,-58778,-60181,-61566,-62932,
    -64278,-65605,-66913,-68199,-69465,-70710,-71933,-73135,-74314,-75470,
    -76604,-77714,-78801,-79863,-80901,-81915,-82903,-83867,-84804,-85716,
    -86602,-87461,-88294,-89100,-89879,-90630,-91354,-92050,-92718,-93358,
    -93969,-94551,-95105,-95630,-96126,-96592,-97029,-97437,-97814,-98162,
    -98480,-98768,-99026,-99254,-99452,-99619,-99756,-99862,-99939,-99984,
    -100000,-99984,-99939,-99862,-99756,-99619,-99452,-99254,-99026,-98768,
    -98480,-98162,-97814,-97437,-97029,-96592,-96126,-95630,-95105,-94551,
    -93969,-93358,-92718,-92050,-91354,-90630,-89879,-89100,-88294,-87461,
    -86602,-85716,-84804,-83867,-82903,-81915,-80901,-79863,-78801,-77714,
    -76604,-75470,-74314,-73135,-71933,-70710,-69465,-68199,-66913,-65605,
    -64278,-62932,-61566,-60181,-58778,-57357,-55919,-54463,-52991,-51503,
    -50000,-48480,-46947,-45399,-43837,-42261,-40673,-39073,-37460,-35836,
    -34202,-32556,-30901,-29237,-27563,-25881,-24192,-22495,-20791,-19080,
    -17364,-15643,-13917,-12186,-10452,-8715,-6975,-5233,-3489,-1745,
    0,1745,3489,5233,6975,8715,10452,12186,13917,15643,
    17364,19080,20791,22495,24192,25881,27563,29237,30901,32556,
    34202,35836,37460,39073,40673,42261,43837,45399,46947,48480,
    50000,51503,52991,54463,55919,57357,58778,60181,61566,62932,
    64278,65605,66913,68199,69465,70710,71933,73135,74314,75470,
    76604,77714,78801,79863,80901,81915,82903,83867,84804,85716,
    86602,87461,88294,89100,89879,90630,91354,92050,92718,93358,
    93969,94551,95105,95630,96126,96592,97029,97437,97814,98162,
    98480,98768,99026,99254,99452,99619,99756,99862,99939,99984};

}

/* 
   Local Variables:
   mode: java
   End:
*/