Proccessing for Androidで遊んでみました。
特に何でもないアプリだけど、雨模様に見えませんか?
一応マルチタッチで青い円が描けますが、動画だと見にくいですね。
PImage bg; int an = 50; float[] ax = new float[an]; float[] ay = new float[an]; float[] ix = new float[an]; float[] iy = new float[an]; float[] is = new float[an]; float[] ellipseSize = new float[an]; float[] ellipseAxis = new float[an]; void setup(){ background(0); size(720,1280); bg = loadImage("rainy.png"); frameRate(30); for(int i=0;i<ax.length;i++){ ax[i] = random(width); ay[i] = random(height); ellipseSize[i] = random(width/10); ellipseAxis[i] = random(1.02,1.07); ix[i] = 0; iy[i] = 0; is[i] = 0; } } void draw(){ background(0); image(bg, 0, 0); noFill(); for(int i=0;i<ax.length;i++){ if(ellipseSize[i]>width){ ax[i] = random(width); ay[i] = random(height); ellipseSize[i] = random(20,width/10); }else{ ellipseSize[i] *= ellipseAxis[i]; } stroke(255,255,255,255-((ellipseSize[i]/width)*255)); ellipse(ax[i],ay[i],ellipseSize[i],ellipseSize[i]); } for(int i=0;i<ix.length;i++){ if(is[i] != 0){ if(is[i]<width){ is[i] *= ellipseAxis[i]; }else{ is[i] = 0; } stroke(0,0,255,255-((is[i]/width)*255)); ellipse(ix[i],iy[i],is[i],is[i]); } } } void mousePressed(){ noFill(); for(int i=0;i<ix.length;i++){ if(is[i] == 0){ ix[i] = mouseX; iy[i] = mouseY; is[i] = random(width/10); break; } } }