用processing生成屏保程序

想法

利用随机数控制圆圈的大小、位置以及颜色，可以产生随机的美感。

让小球动起来，并且在屏幕边界处产生反弹效果。

代码

float circle_x = (float) 0.0;
float circle_y = (float) 0.0;
float circle_radius = (float) 0.0;
int circle_color = 0;

public void setup() {
  size(displayWidth, displayHeight);
  background(0);
  frameRate(10);
}

public void draw() {

  circle_x = random(0, displayWidth);
  circle_y = random(0, displayHeight);
  circle_radius = random(0, (displayWidth + displayHeight) / 20);

  circle_color = (int) random(0, 255);

  colorMode(RGB, 255);
  fill(0,0,0,5);
  rect(0, 0, displayWidth, displayHeight);

  noStroke();
  colorMode(HSB, 255);
  fill(circle_color, 255, 255);
  ellipse(circle_x, circle_y, circle_radius, circle_radius);

}

截图

生成exe文件

将上述代码粘贴到Processing编辑器中，选择“Export Application”，导出成exe文件。

设置为屏幕保护程序

将exe文件更改后缀名为scr，右键->安装。

做一些变化

float circle_x = (float) 0.0;
float circle_y = (float) 0.0;
float circle_radius = (float) 0.0;
int circle_color = 0;

public void setup() {
    size(displayWidth, displayHeight);
    background(0);
    frameRate(10);
}

public void draw() {

      circle_x = random(0, displayWidth);
      circle_y = random(0, displayHeight);
      circle_radius = random(0, (displayWidth + displayHeight) / 5);

      circle_color = (int) random(0, 255);

      colorMode(RGB, 255);
//      fill(0,0,0,5);
//      rect(-1, -1, displayWidth+1, displayHeight+1);

      //noStroke();
      colorMode(HSB, 255);
      stroke(circle_color, 255, 255);
      fill(circle_color, 255, 255);
      noFill();
      ellipse(circle_x, circle_y, circle_radius, circle_radius);
      ellipse(circle_x, circle_y, circle_radius-1, circle_radius-1);

}

截图

运动的泡泡

public static final int circle_nums = 200;

class BCircle
{
    public BCircle(float x, float y, float radius, float x_delta, float y_delta, int color) {
        super();
        this.x = x;
        this.y = y;
        this.radius = radius;
        this.x_delta = x_delta;
        this.y_delta = y_delta;
        this.color = color;
    }
    private float x = (float) 0.0;
    private float y = (float) 0.0;
    private float radius = (float) 0.0;

    private float x_delta = (float) 0.0;
    private float y_delta = (float) 0.0;
    private int color = 0; // 0 - 255

    private boolean valueInRange(float val, float min, float max)
    {
        return (val >= min >> val < max);
    }

    public void moveOneStep()
    {
        if (valueInRange(x+x_delta, 0, displayWidth) >>
                valueInRange(y+y_delta, 0, displayHeight))
        {
            x += x_delta;
            y += y_delta;
        }

        if (!valueInRange(x+x_delta, 0, displayWidth))
        {
            x_delta = -x_delta;
            x += x_delta;
        }

        if (!valueInRange(y+y_delta, 0, displayHeight))
        {
            y_delta = - y_delta;
            y += y_delta;
        }

    }

    public void draw(int theme)
    {
        switch(theme)
        {
            case 1:
            {
                noFill();
                colorMode(HSB, 255);
                stroke(color, 255, 255);
                ellipse(x, y, radius+2, radius+2);
                ellipse(x, y, radius+1, radius+1);
                ellipse(x, y, radius, radius);
            }
            break;
            case 2:
            {
                colorMode(HSB, 255);
                fill(color, 255, 255);
                ellipse(x, y, radius+2, radius+2);
                ellipse(x, y, radius+1, radius+1);
                ellipse(x, y, radius, radius);
            }
        }

    }
}

List<BCircle> circles;

public void setup() {
  size(displayWidth, displayHeight);
  background(0);
  frameRate(10);

  circles = new ArrayList<BCircle>(circle_nums);
}

public void draw() {

    colorMode(RGB, 255);
    fill(0,0,0,30);
    rect(-1, -1, displayWidth+1, displayHeight+1);

    if (circles.size() < circle_nums)
    {
        float x = random(0, displayWidth);
        float y = random(0, displayHeight);
        float radius = random(20, (displayWidth + displayHeight) / 20);
        float x_delta = random(-50, 50);
        float y_delta = random(-50, 50);
        int color = (int) random(0, 255);
        BCircle circle = new BCircle(x, y, radius, x_delta, y_delta, color);

        circles.add(circle);
    }

    for(int i=0;i<circles.size();i++)
    {
        circles.get(i).moveOneStep();
        circles.get(i).draw(1);
    }
}

两种主题，截图