angry birds

/************************
 * Author: Nemeth Balint
 * Last Mod: 2020.10.04
 * name: amgry birbs
 ***********************/

#include <stdio.h>
#include <math.h>

#define gravity 9.81 // m/s2
#define PI 3.141592654
#define rMadar 0.1 // m
#define rMalac 0.1 // m
#define hMadar 3 //m
#define hMalac 7 // m


double palya(int x, double alfa, int v0);
double Ytransformer(double input);
int Xtransformer(int input);
void background(FILE *fp);

int main() {
    FILE *fp;
    fp = fopen("angry.svg","w");
    //FILE
    if (fp != NULL){
        int distanceSTART = 30;
        int difference = hMalac-hMadar;
        double distanceEND, posY;

        //FIRST LINE
        fprintf(fp, "<svg width=\"%d\" height=\"%d\" xmlns=\"http://www.w3.org/2000/svg\" "
                    "version=\"1.1\">\n", 850, 250);
        //BACKGROUND
        background(fp);

        //MAIN
        printf("Talalthoz szukseges ertekek: \n");
        for(int v0 = 10; v0 <= 30; v0++) {
            for (int alfa = 0; alfa <= 60; alfa += 5){
                posY = palya(distanceSTART, alfa/(180/PI), v0);
                distanceEND = sqrt(pow(posY-difference,2));

                if(distanceEND < (rMadar + rMalac)){
                    printf("Kezdo sebesseg: %d m/s || Szog: %d fok \n", v0, alfa);
                    for(int posX = 0; posX <= 30; posX++){
                        posY = palya(posX, alfa/(180/PI), v0);
                        fprintf(fp, "   <circle cx=\"%d\" cy=\"%lf\" r=\"%d\" "
                                    "stroke=\"black\" fill=\"black\" />"
                                    "\n", Xtransformer(posX), Ytransformer(posY+hMadar), 1);
                    }
                }
            }
        }
        //LAST LINE
        fprintf(fp, "</svg>");
        //CLOSE THE FILE
        fclose(fp);
    }

    else {
        perror("A fajl letrehozasa sikertelen");
    }

    return 0;
}

double palya(int x, double alfa, int v0){
    //x szerinti pálya y
    double posY = x*tan(alfa) - (gravity* pow(x,2))/(2*pow(v0,2)*pow(cos(alfa),2));
    return posY;
}
void background(FILE *fp){
    fprintf(fp, "   <rect width=\"850\" height=\"225\" fill=\"lightblue\"/>\n"); //háttér
    fprintf(fp, "   <circle cx=\"0\" cy=\"0\" r=\"40\" fill=\"yellow\"/>\n"); //nap
    fprintf(fp, "   <rect y=\"230\" width=\"850\" height=\"20\" fill=\"#5a2800\"/>\n"); //föld
    fprintf(fp, "   <rect y=\"225\" width=\"850\" height=\"5\" fill=\"green\"/>\n"); //fű

    fprintf(fp, "   <circle cx=\"%d\" cy=\"%lf\" r=\"%lf\" stroke=\"green\""
                " fill=\"green\" />\n", Xtransformer(30), Ytransformer(hMalac), rMalac*25); //malac
    fprintf(fp, "   <circle cx=\"%d\" cy=\"%lf\" r=\"%lf\" stroke=\"red\" "
                "fill=\"red\" />\n", 50, Ytransformer(hMadar), rMadar*25); //madár
}

//Y COORD pozícionálás
double Ytransformer(double input){
    int sizeMultiplier = 25;
    return input*sizeMultiplier*(-1)+10*sizeMultiplier;
}

//X COORD pozícionálás
int Xtransformer(int input){
    int sizeMultiplier = 25;
    int shiftR = 50;
    return input*sizeMultiplier + shiftR;
}