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@sasaki-shigeo
Created December 20, 2020 17:31
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ArrayList<Star> stars = new ArrayList<Star>();
ArrayList<Crystal> snow = new ArrayList<Crystal>();
void setup() {
size(800, 600);
colorMode(HSB, 360, 1.0, 1.0, 1.0);
for (int i = 0; i < 30; i++) {
stars.add(new Star(random(width), random(0.7 * height), 30));
}
for (int i = 0; i < 100; i++) {
snow.add(new Crystal(random(width), random(height), 15));
}
}
void draw() {
background(#0000cc);
for (Star s: stars) {
s.show();
}
fill(#663300);
triangle(0.5 * width, 0.3 * height,
0.45 * width, 0.9 * height,
0.55 * width, 0.9 * height);
fill(#008800);
triangle(0.5 * width, 0.3 * height,
0.3 * width, 0.75 * height,
0.7 * width, 0.75 * height);
fill(#cccccc);
rect(0, 0.9*height, width, 0.1 * height);
for (Crystal c: snow) {
c.show();
c.fall();
}
}
class Star {
float x;
float y;
float r;
float rand_id = random(1200);
Star(float x, float y, float sz) {
this.x = x;
this.y = y;
this.r = sz / 2;
}
void show() {
if ((rand_id + frameCount) % 1200 < 30) {
return;
}
push();
noStroke();
fill(#ffff00);
translate(x, y);
rotate(radians(-90));
beginShape();
for (int i = 0; i < 5; i++) {
vertex(r * cos(radians(144 * i)),
r * sin(radians(144 * i)));
}
endShape(CLOSE);
pop();
}
}
class Crystal {
float x;
float y;
float r;
float rand_id = random(1.0);
Crystal(float x, float y, float sz) {
this.x = x;
this.y = y;
this.r = sz / 2;
}
void show() {
push();
fill(#ffffff);
stroke(#ffffff);
strokeWeight(2);
float amp = -50 + 100 * noise(x / width, y / height);
amp = 25 * sin(2 * PI * (y / height + rand_id));
translate(floor(x + amp), y);
for (int i = 0; i < 6; i++) {
line(0, 0, r * cos(radians(60 * i)), r * sin(radians(60 * i)));
}
pop();
}
void fall() {
y += 0.5;
if (y >= height) {
y = 0;
x = random(width);
}
}
}
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