2022-04-29
突然动了一个念头。送给自己一幅画。

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画作虽不美观，但毕竟是自己编写了程序，并用这个程序画的。

程序说明：
按着f(代表flower),拖动鼠标绘制梅花花朵；按着s(代表stem),拖动鼠标绘制梅花主干。

int angle = 0;

void setup() {
  size(640, 360);
  background(102);//背景可更改。
  noStroke();
  fill(0, 102);
}

void draw() {
  if (keyPressed) {
    if (key == 'f' || key == 'F') { //flower
      
        // Draw only when mouse is pressed
  if (mousePressed == true) {
    angle += 5;
    float val = cos(radians(angle)) * 12.0;
    for (int a = 0; a < 360; a += 75) {
      float xoff = cos(radians(a)) * val;
      float yoff = sin(radians(a)) * val;
      fill(0);
      ellipse(mouseX + xoff, mouseY + yoff, val, val);
    }
    fill(255,0,0);
    ellipse(mouseX, mouseY, 5, 5);
    
    
  }
    }


  
    if (key == 's' || key == 'S') { //stem
    stroke(0);
    strokeWeight(abs(mouseX-pmouseX));
    line(mouseX,mouseY,pmouseX,pmouseY);
    
}

  }
}

调整一下颜色似乎好些。

int angle = 0;

void setup() {
  size(640, 360);
  background(245);
  noStroke();
  fill(0, 102);
}

void draw() {
  if (keyPressed) {
    if (key == 'f' || key == 'F') { //flower
      
        // Draw only when mouse is pressed
  if (mousePressed == true) {
    angle += 5;
    float val = cos(radians(angle)) * 12.0;
    for (int a = 0; a < 360; a += 75) {
      float xoff = cos(radians(a)) * val;
      float yoff = sin(radians(a)) * val;

      fill(255,0,0);
      ellipse(mouseX + xoff, mouseY + yoff, val, val);
    }
    fill(255,255,0);
    ellipse(mouseX, mouseY, 5, 5);
    
    
  }
    }


  
    if (key == 's' || key == 'S') { //stem
    stroke(abs(mouseX-pmouseX));
    strokeWeight(abs(mouseX-pmouseX));
    line(mouseX,mouseY,pmouseX,pmouseY);
    
}

  }
}

以下试图用noise来实现主干的颜色灰度自然变化。但效果不好。待改进。

image.png

int angle = 0;
float x;
float t;
void setup() {
  size(640, 360);
  background(245);
  noStroke();
  fill(0, 102);
}

void draw() {
  if (keyPressed) {
    if (key == 'f' || key == 'F') { //flower
      
        // Draw only when mouse is pressed
  if (mousePressed == true) {
    angle += 5;
    float val = cos(radians(angle)) * 12.0;
    for (int a = 0; a < 360; a += 75) {
      float xoff = cos(radians(a)) * val;
      float yoff = sin(radians(a)) * val;
      noStroke();
      fill(255,0,0);
      ellipse(mouseX + xoff, mouseY + yoff, val, val);
    }
    stroke(0);
    fill(255,255,0);
    ellipse(mouseX, mouseY, 5, 5);
    
    
  }
    }


  
    if (key == 's' || key == 'S') { //stem
    //x=map(noise(t),0,1,0,abs(mouseX-pmouseX)+abs(mouseY-pmouseY));
    x=map(noise(t),0,1,0,90);
    stroke(x);
    strokeWeight(abs(mouseX-pmouseX)+abs(mouseY-pmouseY));
    line(mouseX,mouseY,pmouseX,pmouseY);
    t+=0.01;
}

  }
}