float[] xWerte = {8,8,8,2,4};
float[] yWerte = {2,8,1,2,9};

float minX, maxX, minY, maxY;
float screenMinX, screenMaxX, screenMinY, screenMaxY;
float padding = 50.0;

void setup(){
  size(600,600);
  background(64);
  
  // calculate limits
  minX = 0;
  minY = 0;
  maxX = 0;
  maxY = 0;
  
  for(int i = 0; i < xWerte.length; i++){
    if(xWerte[i] > maxX) maxX = xWerte[i];
    if(yWerte[i] > maxY) maxY = yWerte[i];
  }
  
  screenMinX = padding;
  screenMaxX = width - padding;
  screenMinY = height - padding;
  screenMaxY = padding;

}

void draw(){
  stroke(255,255,255);
  strokeWeight(5);
  
  for(int i = 0; i < xWerte.length; i++){
    float x = xWerte[i];
    float y = yWerte[i];
    float xPos = ((x - minX) / (maxX-minX)) * (screenMaxX-screenMinX) + screenMinX;
    float yPos = ((y - minY) / (maxY-minY)) * (screenMaxY-screenMinY) + screenMinY;

    point(xPos, yPos);
  }
}