書いた円より一回り大きい円を書く（執筆中）

import java.util.*;

ArrayList<PVector> line=null;

PVector frame[], frame2[];

void setup() {

size(800, 600, P3D);

frame=new PVector[4];

frame[0]=new PVector(100, 100);

frame[1]=new PVector(100, 500);

frame[2]=new PVector(700, 500);

frame[3]=new PVector(700, 100);

createOutFrame();

}

void draw() {

background(255);

if (line!=null) {

stroke(0);

line.add(new PVector(mouseX, mouseY));

beginShape();

for (PVector pv : line) {

vertex(pv.x, pv.y);

}

endShape();

}

if (frame!=null) {

stroke(255, 0, 0);

beginShape();

for (PVector pv : frame) {

vertex(pv.x, pv.y);

}

endShape(CLOSE);

}

if (frame2!=null) {

stroke(0, 0, 255);

beginShape();

for (PVector pv : frame2) {

vertex(pv.x, pv.y);

}

endShape(CLOSE);

}

}

void mousePressed() {

if (mouseButton==LEFT) {

line=new ArrayList<PVector>();

}

}

void mouseReleased() {

if (line!=null) {

ArrayList<PVector> aaa=new ArrayList<PVector>();

PVector old=null;

for (PVector p : line) {

if (old==null) {

aaa.add(p);

old=p;

continue;

}

if (PVector.dist(p, old)<1) {

continue;

}

aaa.add(p);

old=p;

}

frame=aaa.toArray(new PVector[0]);

line=null;

createOutFrame();

}

}

void createOutFrame() {

float time=10;

frame2=new PVector[frame.length];

float ang=0;

for (int i=0; i<frame.length; i++) {

PVector A=frame[(frame.length+i-1)%frame.length];

PVector O=frame[i];

PVector B=frame[(i+1)%frame.length];

PVector AO=PVector.sub(O, A);

PVector OB=PVector.sub(B, O);

AO.normalize();

OB.normalize();

ang+=AO.x*OB.y-AO.y*OB.x;

}

for (int i=0; i<frame.length; i++) {

PVector A=frame[(frame.length+i-1)%frame.length];

PVector O=frame[i];

PVector B=frame[(i+1)%frame.length];

PVector AO=PVector.sub(O, A);

PVector BO=PVector.sub(O, B);

AO.normalize();

BO.normalize();

PVector dir=PVector.add(AO, BO);

dir.normalize();

if (dir.magSq()<0.1) {

BO.rotate(HALF_PI);

if (ang<0) {

BO.mult(-1);

}

BO.mult(time);

frame2[i]=new PVector(frame[i].x, frame[i].y);

frame2[i].add(BO);

continue;

}

if ((AO.x*dir.y-AO.y*dir.x)*ang>0) {

dir.mult(-1);

}

frame2[i]=new PVector(frame[i].x, frame[i].y);

dir.mult(time);

frame2[i].add(dir);

}

}