Data commit

Task/Julia-set/C/julia-set.c

@@ -0,0 +1,78 @@
+#include<graphics.h>
+#include<stdlib.h>
+#include<math.h>
+
+typedef struct{
+	double x,y;
+}complex;
+
+complex add(complex a,complex b){
+	complex c;
+	c.x = a.x + b.x;
+	c.y = a.y + b.y;
+	return c;
+}
+
+complex sqr(complex a){
+	complex c;
+	c.x = a.x*a.x - a.y*a.y;
+	c.y = 2*a.x*a.y;
+	return c;
+}
+
+double mod(complex a){
+	return sqrt(a.x*a.x + a.y*a.y);
+}
+
+complex mapPoint(int width,int height,double radius,int x,int y){
+	complex c;
+	int l = (width<height)?width:height;
+	
+	c.x = 2*radius*(x - width/2.0)/l;
+	c.y = 2*radius*(y - height/2.0)/l;
+	
+	return c;
+}
+
+void juliaSet(int width,int height,complex c,double radius,int n){
+	int x,y,i;
+	complex z0,z1;
+	
+	for(x=0;x<=width;x++)
+		for(y=0;y<=height;y++){
+			z0 = mapPoint(width,height,radius,x,y);
+			for(i=1;i<=n;i++){
+				z1 = add(sqr(z0),c);
+				if(mod(z1)>radius){
+					putpixel(x,y,i%15+1);
+					break;
+				}
+				z0 = z1;
+			}
+			if(i>n)
+				putpixel(x,y,0);
+		}
+}
+
+int main(int argC, char* argV[])
+{
+	int width, height;
+	complex c;
+	
+	if(argC != 7)
+		printf("Usage : %s <width and height of screen, real and imaginary parts of c, limit radius and iterations>");
+	else{
+		width = atoi(argV[1]);
+		height = atoi(argV[2]);
+		
+		c.x = atof(argV[3]);
+		c.y = atof(argV[4]);
+		
+		initwindow(width,height,"Julia Set");
+		juliaSet(width,height,c,atof(argV[5]),atoi(argV[6]));
+		
+		getch();
+	}
+	
+	return 0;
+}