/*
 * 作成日: 2005/02/09   (C) H.Ishikawa
 */
/* 
 *          スクリーン座標と論理座標を変換するｃｌａｓｓ
 */ 
package window;

import java.awt.Graphics;
import java.awt.Color;

public class Window {

    static int  WINDOW =   5;                 /* Windowの数　0から最大4まで */

	static int    win_sx1[] = new int[WINDOW];              /* スクリーン座標上のx1 */
	static int    win_sy1[] = new int[WINDOW];              /* スクリーン座標上のy1 */
	static int    win_sx2[] = new int[WINDOW];              /* スクリーン座標上のx2 */
	static int    win_sy2[] = new int[WINDOW];              /* スクリーン座標上のy2 */
	static double win_wx1[] = new double[WINDOW];              /* 論理座標上のx1 */
	static double win_wy1[] = new double[WINDOW];              /* 論理座標上のy1 */
	static double win_wx2[] = new double[WINDOW];              /* 論理座標上のx2 */
	static double win_wy2[] = new double[WINDOW];              /* 論理座標上のy2 */
	static double win_sdx[] = new double[WINDOW];              /* スクリーン座標と論理座標の比 */
	static double win_sdy[] = new double[WINDOW];              /* スクリーン座標と論理座標の比 */
	static double win_cpx[] = new double[WINDOW];              /* 現在位置x */
	static double win_cpy[] = new double[WINDOW];              /* 現在位置y */
 
	String s;


	/* 関数定義 */
	public void setWindow(int win, double wx1, double wy1, double wx2, double wy2,
									int x1, int y1, int x2, int y2) {
		win_sx1[win] = x1;  win_sy1[win] = y1;
		win_sx2[win] = x2;  win_sy2[win] = y2;
		win_wx1[win] = wx1; win_wy1[win] = wy1;
		win_wx2[win] = wx2; win_wy2[win] = wy2;
		win_sdx[win] = (double)((x2-x1) / (wx2-wx1));
		win_sdy[win] = (double)((y2-y1) / (wy2-wy1));
		 
	   
	}

	public double getWx(int win, int screenx) {
		return(win_wx1[win] + (double)((screenx - win_sx1[win]) / win_sdx[win]));
	}

	public double getWy(int win, int screeny) {
		return(win_wy1[win] + (double)((screeny - win_sy1[win]) / win_sdy[win]));
	}

	public int getSx(int win, double x) {
	    return(win_sx1[win] + (int)((x - win_wx1[win]) * win_sdx[win]));
	}

	public int getSy(int win, double y) {
		return(win_sy1[win] + (int)((y - win_wy1[win]) * win_sdy[win]));
	}

	public void axis(int win,
			  String x_axis, double x_scale, String y_axis, double y_scale, Graphics g) {
		double x ;
		double y ;
		
		g.setColor(Color.lightGray);                             
		x = x_scale;
		/* 原点から右へ目盛りをかく */
		while (x <= win_wx2[win]) { 
			if (win_wx1[win] <= x) {line( win, x, win_wy1[win], x, win_wy2[win], g);}
			x = x + x_scale;
		}
		x = -x_scale;
		/* 原点から左に目盛りをかく */
		while (win_wx1[win] <= x) {
			if (x <= win_wx2[win]) {line( win, x, win_wy1[win], x, win_wy2[win], g);}
			x = x - x_scale;
		}
		y = y_scale;
		/* 原点から上に目盛りをかく */
		while (y <= win_wy2[win]) {
			if (win_wy1[win] <= y) {line( win, win_wx1[win], y, win_wx2[win], y, g);}
			y = y + y_scale;
		}
		y = -y_scale;
		/* 原点から下に目盛りをかく */
		while (win_wy1[win] <= y) {
			if (y <= win_wy2[win]) line( win, win_wx1[win], y, win_wx2[win], y, g);
			y = y - y_scale;
		}
		g.setColor(Color.black);  
		if (win_wy1[win] <= 0.0 && 0.0 <= win_wy2[win]) {
			line(win, win_wx1[win], 0.0, win_wx2[win], 0.0, g); 
		}  /* 縦軸 */
		if (win_wx1[win] <= 0.0 && 0.0 <= win_wx2[win]) {
			line(win, 0.0, win_wy1[win], 0.0, win_wy2[win], g);
		}   /* 横軸 */                                    
	 	/*タイトルをかく */
		s = "    Window " + win + "    横軸 : " + x_axis + " [ " + x_scale + " / div ]" +
			"     縦軸 : " + y_axis + " [ " + y_scale + " / div ]";
		g.drawString(s,getSx(win,win_wx1[win]) , getSy(win,win_wy1[win]) + 10);
	}

	public void   line(int win, double x0, double y0, double x1, double y1, Graphics g) {
		g.drawLine(getSx(win,x0), getSy(win, y0), getSx(win, x1), getSy(win, y1));
	}

	public void  putPixel(int win, double x, double y, Graphics g) {
		g.drawLine(getSx(win, x), getSy(win, y),getSx(win, x), getSy(win, y));
	}

	public void moveTo(int win, double x, double y, Graphics g) {
		win_cpx[win] = x;
		win_cpy[win] = y;
	}

	public void lineTo(int win, double x, double y, Graphics g) {
		line(win, win_cpx[win], win_cpy[win], x, y, g);
		moveTo(win, x, y, g);
	}
}