Processingは楽しいな キレイな色玉を飛ばして しばらくじっと眺めてみよう 色玉が静かに底に沈んだら 今度はマウスでクリックね メッセージを押してもう一度 Processingは楽しいな
ArrayList letters; PFont font; int numLetters; void setup(){ size(320, 460); letters = new ArrayList(); numLetters = 100; font = createFont("Helvetica", 18, true); smooth(); noLoop(); } void draw(){ if (letters.size() < numLetters){ letters.add(new Letter()); } background(0); boolean allStop = true; for (int i = 0; i<letters.size(); i++){ Letter l = (Letter) letters.get(i); l.collide(letters); l.move(); l.display(); if (allStop && mag(l.spx, l.spy) < 2) allStop = true; else allStop = false; } if (allStop){ fill(204, 255, 0, 90); textFont(font); textSize(18); text("Processing is fun!", width/2, height/3); } } class Letter { char[] alphabet= {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'}; char letter; float x, y, spx, spy, r, tsize; color c; float FRICTION = -0.7; float SPRING = 0.3; float GRAVITY = 0.07; boolean on_collition; public Letter () { letter = alphabet[int(random(alphabet.length))]; r = 12; tsize = 10; x = 0; y = height; spx = random(-0.5, 0.5); spy = -0.5; c = randomColor(); on_collition = false; } void move() { spy += GRAVITY; x += spx; y += spy; if (x + r > width) { x = width - r; spx *= FRICTION; } else if (x - r < 0) { x = r; spx *= FRICTION; } if (y + r > height) { y = height - r; spy *= FRICTION; } if (mag(spx, spy) < 0.8 && on_collition){ spx = spy = 0; } on_collition = false; } void bounce() { float minx = r; float maxx = width-r; float maxy = height -r; if (x < minx || x > maxx){ spx = -spx * FRICTION; if (x < minx) { x = 2*minx - x;} else { x = 2*maxx -x; } } if (y > maxy){ spy = -spy * FRICTION; y = 2*maxy - y; } } void collide(ArrayList others) { for (int i = 0; i<others.size(); i++){ Letter other = (Letter) others.get(i); if (this == other) return; float ox = other.x; float oy = other.y; float distance = dist(x, y, ox, oy); float minDist = other.r + r; if (distance <= minDist){ float angle = atan2(oy-y, ox-x); float targetX = x + cos(angle) * minDist; float targetY = y + sin(angle) * minDist; float ax = (targetX - ox) * SPRING; float ay = (targetY - oy) * SPRING; spx -= ax; spy -= ay; other.spx += ax; other.spy += ay; on_collition = true; } } } void display() { fill(c, 80); noStroke(); ellipseMode(CENTER); ellipse(x, y, r*2, r*2); textAlign(CENTER); textSize(tsize); fill(c); text(letter, x, y+r/3); on_collition = false; } private color randomColor() { color c = color(random(255), random(255), random(255)); return c; } } void mousePressed() { float d = dist(mouseX, mouseY, width/2, height/3); if (d < 100) { setup(); loop(); }; for (int i = 0; i<letters.size(); i++){ Letter letter = (Letter) letters.get(i); float dd = dist(mouseX, mouseY, letter.x, letter.y); if (dd < letter.r){ letter.spx += random(-2, 2); letter.spy -= 12; } } }
(追記：2011-1-31)メッセージのクリックでリスタートできるようにしました。
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