processing demo

Posted 2022-04-02 阿宝逃离地球

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processing demo

交互课上的作业集，现在整理一一下。

1.黑色的画布上自动产生很多不同颜色的圆点

用接近的颜色生成比较好看。
代码如下：

void setup() 
  size(800, 800);
  background(0);

void draw() 
  //create 按 alpha blended background
  fill(0, 1);
  rect(0, 0, width, height);

  //get 3 gaussian random numbers w/ mean of 0 and standard deviation of
  // 1.0
  float r = randomGaussian();
  float g = randomGaussian();
  float b = randomGaussian();

  //define standard deviation and mean
  float sd = 100;
  float mean =100;
  //sclae by standar devition and mean
  //also costrain to between (0,255) since we are dealing with color

  r = constrain((r * sd)+mean, 0, 255);

  //repeat for g & 
  sd = 20;
  mean = 200;
  g = constrain((r*sd)+mean, 0, 255);

  sd = 50;
  mean = 0;
  b = constrain((r*sd)+mean, 0, 255);

  //get more gaussian numbers,this time for position
  float xloc = randomGaussian();
  float yloc = randomGaussian();
  sd = width/10;
  mean = width/2;
  xloc = (xloc * sd) +mean;
  yloc = (yloc*sd) +mean;

  //draw an elllipse with gaussian generated color and position
  noStroke();
  fill(r, g, b);
  ellipse(xloc, yloc, 8, 8);

2.纹理

老师ppt上的案例，自己敲了一遍，修改了一些数据而已。

float increment = 0.03;
void setup() 
  size(640, 360);
  noLoop();


void draw() 
  background(0);
  loadPixels();

  float xoff = 0.0;

  for (int x = 0; x<width; x++) 
    xoff+=increment;
    float yoff = 0.0;
    for (int y = 0; y<height; y++) 
      yoff +=increment;
      float bright = noise(xoff, yoff)*255;

      pixels[x+y*width] = color(bright);
    
  
  updatePixels();