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/** push balls each other * Copyright 2011 Yutaka Kachi * Licensed by New BSD License * http://www.openprocessing.org/sketch/95697 * 複数のボールがウィンドウ内を移動する * ボール同士もぶつかる。 **/ float SPEED = 5; // 移動量 float R = 10; //半径 int NUMBER = 17; // ボールの個数 Ball[] balls = new Ball[NUMBER]; void setup() { size(250, 250); frameRate(20); background(0); float angle = TWO_PI / NUMBER; for (int i = 0; i < NUMBER; i++) { float addx = cos(angle * i); float addy = sin(angle * i); balls[i] = new Ball( width / 2 + addx * 50, height / 2 + addy * 50, SPEED * addx + 1, SPEED * addy + 1, i, balls); } } void draw() { //background(0); fadeToBlack(); for (int i = 0; i < NUMBER; i++) { balls[i].clearVector(); } for (int i = 0; i < NUMBER; i++) { Ball ball = (Ball) balls[i]; ball.collide(); ball.move(); ball.draw(); } } class Ball { float x, y; //ボールの現在位置（中心） float vx, vy; //ボールの移動量 PVector target = new PVector(); //衝突時に排除される距離 PVector impulse = new PVector(1, 1); //反作用 int id; //ボールの識別番号 Ball[] others; //コンストラクタ Ball( float _x, float _y, float _vx, float _vy, int _id, Ball[] _others) { x = _x; y = _y; vx = _vx; vy = _vy; id = _id; others = _others; } void move() { vx *= impulse.x; x = x + vx + target.x; if (x - R <= 0) { x = R; vx *= -1; } if (x + R >= width) { x = width - R; vx *= -1; } vy *= impulse.y; y = y + vy + target.y; if (y - R <= 0) { y = R; vy *= -1; } if (y + R >= height) { y = height - R; vy *= -1; } } void draw() { noFill(); stroke(255); ellipse(x, y, R * 2, R * 2); } void clearVector() { target.x = 0; target.y = 0; impulse.x = 1; impulse.y = 1; } //衝突判定 void collide() { for (int i = id + 1; i < NUMBER; i++) { Ball otherBall = (Ball) others[i]; //ボール間の距離を求める float dx = otherBall.x - x; float dy = otherBall.y - y; float distance =sqrt(dx * dx + dy * dy); if (distance <= R * 2) { //跳ね返る距離を求める float angle = atan2(dy, dx); float push_distance = R * 2 - distance; // / 2; float push_x = push_distance * cos(angle); float push_y = push_distance * sin(angle); target.x -= push_x; target.y -= push_y; otherBall.target.x += push_x; otherBall.target.y += push_y; //反発後の移動方向を設定 if ((vx >= 0 && vx - otherBall.vx >= 0) || (vx < 0 && vx - otherBall.vx < 0)) { impulse.x = -1; } if (vx * otherBall.vx <= 0) { otherBall.impulse.x = -1; } if ((vy >= 0 && vy - otherBall.vy >= 0) || (vy < 0 && vy - otherBall.vy < 0)) { impulse.y = -1; } if (vy * otherBall.vy <= 0) { otherBall.impulse.y = -1; } } } } } //フェードアウト void fadeToBlack() { noStroke(); fill(0, 60); rectMode(CORNER); rect(0, 0, width, height); } |
http://www.openprocessing.org/sketch/95697
https://processing.org/reference/PVector.html