我的processing学习笔记

ball=new BouncBall(width/2,height/2,20,2,2.5); bang=new bangbang(120); bks=new brick[24];/// int k=0;

for(int i=0;i<6;i++) {

for(int j=0;j<4;j++) {

bks[k]=new brick(i*80,j*20,80,20); k++; } } }

void draw() {

for(int i=0;i

bks[i].display();

ball.crash(bks[i],ball); }

ball.move(bang);

fill(255,10); noStroke();

rect(0,0,width,height-20); noStroke(); fill(255,255);

rect(0,height-20,width,20); fill(255,0,0); //stroke(255); ball.display(); bang.display(); }

3.学习使用noise（）函数，修改自《代码本色》中的一个例子：一个随机游走的小球，颜色随时间变化 class Walker{ float x,y; float tx,ty; float r,b,g; float tr,tb,tg;

Walker()

{

tx=0;

ty=10000; tr=0; tb=1000; tg=2000; }

void step() {

x=map(noise(tx),0,1,0,width); y=map(noise(ty),0,1,0,height); tx+=0.01; ty+=0.01; }

void c() //color {

r=map(noise(tr),0,1,0,255); b=map(noise(tb),0,1,0,255); g=map(noise(tg),0,1,0,255); tr+=0.01; tb+=0.01; tg+=0.01; } }

Walker w; void setup() {

size(480,480); w=new Walker(); }

void draw() {

w.step(); w.c();

fill(w.r,w.b,w.g);

ellipse(w.x,w.y,20,20); }

4.学习《代码本色》后编的两个相互吸引运动的小球，在边界会转到另一边去： class Mover {

PVector location1,location2;

PVector v1,v2;

PVector acceleration1,acceleration2; Mover() {

location1=new PVector(random(width),random(height)); v1=new PVector(random(-2,2),random(-2,2)); acceleration1=PVector.random2D();

location2=new PVector(random(width),random(height)); v2=new PVector(random(-2,2),random(-2,2)); acceleration2=PVector.random2D(); }

void update() {

// PVector mouse=new PVector(mouseX,mouseY); PVector dir1=PVector.sub(location2,location1); PVector dir2=PVector.sub(location1,location2); dir1.normalize(); dir1.mult(0.5); acceleration1=dir1; v1.add(acceleration1); v1.limit(10);

location1.add(v1);

//acceleration2=PVector.mult(dir1,-0.1);

dir2.normalize(); dir2.mult(0.5); acceleration2=dir2; v2.add(acceleration2); v2.limit(10);

location2.add(v2); }

void display() {

stroke(0); fill(175);

ellipse(location1.x,location1.y,16,16); ellipse(location2.x,location2.y,16,16); }

void checkEdges() {

if(location1.x>width) {

location1.x=0; }

else if(location1.x<0) {

location1.x=width; }

if(location1.y>height) {

location1.y=0; }

else if(location1.y<0) {

location1.y=height; } } }

Mover mover;//s=new Mover[5]; void setup() {

mover=new Mover(); size(480,480); smooth();

//mover.acceleration.x=0.05; //mover.acceleration.y=0.05; }

void draw() {

mover.update(); mover.checkEdges(); mover.display(); }

5.学习数组，把上面两个小球的改为任意个数小球：

int geshu=20; //修改个数，可实现任意多小球相互运动，边界条件随机。

class Mover {

PVector[] location=new PVector[geshu]; PVector[] v=new PVector[geshu];

PVector[] acceleration=new PVector[geshu]; Mover() {

for(int i=0;i

location[i]=new PVector(random(width),random(height));

v[i]=new PVector(random(-2,2),random(-2,2)); acceleration[i]=PVector.random2D(); } }

void update() {

for(int i=0;i

PVector dir=new PVector(0,0);

for(int j=0;j

if(i==j) { } else {

PVector tempdir=PVector.sub(location[j],location[i]); dir.add(tempdir); } }

dir.normalize(); dir.mult(0.5);

acceleration[i]=dir;

v[i].add(acceleration[i]); v[i].limit(10); }

for(int i=0;i

location[i].add(v[i]); } }

void display() {