Processing练习之自动绘制

案例代码如下：

import processing.pdf.*;

import java.util.Calendar;

boolean savePDF = false;

int maxCount = 5000;

int currentCount = 1;

float\[\] x=new floatmaxCount;

float\[\] y=new floatmaxCount;

float\[\] r=new floatmaxCount;

void setup(){

size(600,600);

smooth();

frameRate(10);

x0 = width/2;

y0 = height/2;

r0 = 10;

}

void draw(){

if(savePDF)beginRecord(PDF,timestamp()+".pdf");

background(255);

strokeWeight(0.5);

float newR = random(1,7);

float newX = random(0+newR,width-newR);

float newY = random(0+newR,height-newR);

float closestDist = 100000000;

int closestIndex =0;

for(int i=0;i<currentCount;i++){

float newDist = dist(newX,newY,xi,yi);

if(newDist <closestDist){

closestDist =newDist;

closestIndex=i;

}

}

float angle =atan2(newY-yclosestIndex,newX-xclosestIndex);

xcurrentCount =xclosestIndex+cos(angle)*(rclosestIndex+newR);

ycurrentCount =yclosestIndex+sin(angle)*(rclosestIndex+newR);

rcurrentCount = newR;

currentCount++;

for(int i=0;i<currentCount;i++){

fill(50);

ellipse(xi,yi,ri*2,ri*2);

}

if(currentCount++>=maxCount) noLoop();

if(savePDF){

savePDF =false;

endShape();

}

}

void keyReleased(){

if(key=='s'||key=='S') saveFrame(timestamp()+"_##.png");

if(key=='p'||key=='P') savePDF=true;

}

String timestamp(){

Calendar now=Calendar.getInstance();

return String.format("%1ty%1tm%1td_%1tH%1tM%1tS",now);

}

保存并运行如图1

图1