processing sketch wobling the texture

strip.pde

// undecorate window (remove window borders etc)  - - - - - - - - - - - - - - -
public void init() { frame.removeNotify(); frame.setUndecorated(true);
                     frame.addNotify(); super.init(); }


// declarations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

PImage texture1;
float oscilator;

void setup() { // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  float sizefactor = 1; // define the size of the screen

  size( int( 1920 * sizefactor ),
        int( 1080 * sizefactor ),
        P3D ); // renderer

  // framerate
  frameRate(60); 

  texture1 = loadImage("colorado.jpg");

  
}

void draw() { // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  oscilator = frameCount % 628;
  oscilator = oscilator * 0.01;
  oscilator = sin(oscilator);
  oscilator = oscilator * 0.1;
  oscilator = oscilator + 1;

  background(0);

  //  fill(127, 127);
  stroke(255,1);
  
  
  beginShape(QUAD_STRIP);

  textureMode(NORMAL);
  texture(texture1);
  
  vertex(0, 0, 0, 0);
  vertex(0, height, 0, 1);

  vertex(width*0.25, 0, 0.25, 0);
  vertex(width*0.2, height, 0.2, 1);

  vertex(width*0.66, 0, 0.56 * oscilator, 0);
  vertex(width*0.80, height, 0.70 * oscilator, 1);

  vertex(width, 0, 1, 0);
  vertex(width, height, 1, 1);

  endShape();
  
}