madebront
float xmin = -2.5;
float ymin = -2;
float wh = 8;
w값을 키우면 전체범위가 보인다.
pixels[i+j*width] = color(n*16 % 255)->
pixels[i+j*width] = color(n*16 % 255,n*16 % 255,255-n*16 % 255); rgb모드로바꿔줌
16->등고선간격
xmin -= wh*bx/100;
ymin -= wh*by/100;
wh를 곱해줘서 (scale) 드래그했을때 너무 많이 이동하지 않도록 해준다.
/**
* The Mandelbrot Set
* by Daniel Shiffman.
*
* Simple rendering of the Mandelbrot set.
*/
// Establish a range of values on the complex plane
// A different range will allow us to "zoom" in or out on the fractal
// float xmin = -1.5; float ymin = -.1; float wh = 0.15;
double xmin = -1.5;
double ymin = -0.00001;
double wh =4;
double xc=0;
double yc=0;
float bx;
float by;
boolean locked = false;
float bdifx = 0.0;
float bdify = 0.0;
void setup() {
size(800, 800, P2D);
//noLoop();
background(255);
// Make sure we can write to the pixels[] array.
// Only need to do this once since we don't do any other drawing.
loadPixels();
}
void draw() {
// Maximum number of iterations for each point on the complex plane
int maxiterations = 200;
if(locked){ //들랰깅할땜움직
xc -= wh*bx/500;
yc -= wh*by/500;
xmin=xc-wh/2;
ymin=yc-wh/2; //center
}
// x goes from xmin to xmax
double xmax = xmin + wh;
// y goes from ymin to ymax
double ymax = ymin + wh;
// Calculate amount we increment x,y for each pixel
double dx = (xmax - xmin) / (width);
double dy = (ymax - ymin) / (height);
// Start y
double y = ymin;
for (int j = 0; j < height; j++) {
// Start x
double x = xmin;
for (int i = 0; i < width; i++) {
// Now we test, as we iterate z = z^2 + cm does z tend towards infinity?
double a = x;
double b = y;
int n = 0;
while (n < maxiterations) {
double aa = a * a;
double bb = b * b;
double twoab = 2.0 * a * b;
a = aa - bb + x;
b = twoab + y;
// Infinty in our finite world is simple, let's just consider it 16
if(aa + bb > 16.0) {
break; // Bail
}
n++;
}
// We color each pixel based on how long it takes to get to infinity
// If we never got there, let's pick the color black
if (n == maxiterations) {
pixels[i+j*width] = 0;
} else {
// Gosh, we could make fancy colors here if we wanted
pixels[i+j*width] = color(n*16 % 255,n*16 % 255,255-n*16 % 255);
}
x += dx;
}
y += dy;
}
updatePixels();
}
void keyPressed() {
if(key=='u') {
wh*=0.5; //print("UP");
}
if(key=='d'){
wh *=2.0; //print("DOWN");
}
}
void mousePressed() {
locked = true;
bdifx = mouseX-bx;
bdify = mouseY-by;
}
void mouseDragged() {
if(locked) {
bx = mouseX-bdifx;
by = mouseY-bdify;
}
}
void mouseReleased() {
locked = false;
}