#include <math.h>
#include "svg.h"

const char* nextStr(void) {
    static const char *str[] = {
        "&#x1f680;",
        "香",
        "&#x1f683;",
        "川", 
        "&#x1f684;",
        "大", 
        "&#x1f685;",
        "学",
        "&#x1f691;",
        "工", 
        "&#x1f692;",
        "学",
        "&#x1f699;",
        "部",
        "&#x1f69a;",
        "&#x219c;",
        "&#x1f6a2;",
        "&#x219e;",
        "&#x1f6a4;",
        "&#x21c7;",
        "&#x1f6b2;",
        "&#x21dc;",
        "&#x1f40c;",
        "&#x21e0;",
    };
    static const int numStr = sizeof(str)/sizeof(char*);
    static int k = 0;
    const char* ret = str[k++];
    if (k >= numStr) {
        k=0;
    }
    return ret;
}


int main(void) {
    double x = centerX(), y = centerY();
 
    double fontSize = 6;                                     /* フォントサイズ */
    double dx = PHI * fontSize * 1.2, dy = fontSize * 1.2;  /* 初速度の x成分, y成分 */
    double lB = 50, rB = 297-50, uB = 35, dB = 210-35;      /* 壁の座標 */
    double angle = atan2(dy, dx);
    int num = 256;                                           /* 描く文字の総数 */
    int i;
        
    start();
    rulers();
    textFont("Arial", fontSize);             
    for (i=0; i<num; i++) {
        fill(hsb1(i/24.0*PHI, 1, 1));
        pushMatrix();
        translate(x, y);
        rotate(angle);
        translate(-fontSize/2, fontSize/2);
        text(nextStr(), 0, 0);
        popMatrix(); 
        x+=dx; y+=dy;
        if (x<lB) {
            x = 2 * lB - x;
            dx *= -1;
            angle = atan2(dy, dx);
        } else if (x>rB) {
            x = 2 * rB - x;
            dx *= -1;
            angle = atan2(dy, dx);
        }
                
        if (y<uB) {
            y = 2 * uB - y;
            dy *= -1;
            angle = atan2(dy, dx);
        } else if (y>dB) {
            y = 2 * dB - y;
            dy *= -1;
            angle = atan2(dy, dx);
        }
    }
    finish();
    return 0;
}