processing的Dwfulid2D中如何与视频结合

问题遇到的现象和发生背景

问题现象：1、复制粘贴程序的代码进行合并出现只有一个程序有触发
流体程序（可运行）

/**
 * 
 * PixelFlow | Copyright (C) 2016 Thomas Diewald - http://thomasdiewald.com
 * 
 * A Processing/Java library for high performance GPU-Computing (GLSL).
 * MIT License: https://opensource.org/licenses/MIT
 * 
 */


import com.thomasdiewald.pixelflow.java.DwPixelFlow;
import com.thomasdiewald.pixelflow.java.fluid.DwFluid2D;

import processing.core.*;
import processing.opengl.PGraphics2D;


  // Hello World Example for fluid simulations.
  //
  // Controls:
  // LMB/MMB/RMB: add density + Velocity
  //
  
  
  
  // fluid simulation
  DwFluid2D fluid;
  
  // render targets
  PGraphics2D pg_fluid;
  public void settings() {
    size(800, 800, P2D);
  }
  
  public void setup() {
       

// library context
DwPixelFlow context = new DwPixelFlow(this);
context.print();
context.printGL();

// fluid simulation
fluid = new DwFluid2D(context, width, height, 1);

// some fluid parameters
fluid.param.dissipation_velocity = 0.70f;
fluid.param.dissipation_density  = 0.99f;

// adding data to the fluid simulation
fluid.addCallback_FluiData(new  DwFluid2D.FluidData(){
  public void update(DwFluid2D fluid) {
    if(mousePressed){
      float px     = mouseX;
      float py     = height-mouseY;
      float vx     = (mouseX - pmouseX) * +15;
      float vy     = (mouseY - pmouseY) * -15;
      fluid.addVelocity(px, py, 14, vx, vy);
      fluid.addDensity (px, py, 20, 0.0f, 0.4f, 1.0f, 1.0f);
      fluid.addDensity (px, py,  8, 1.0f, 1.0f, 1.0f, 1.0f);
    }
  }
});

// render-target
pg_fluid = (PGraphics2D) createGraphics(width, height, P2D);

frameRate(60);

  

  
```java
public void draw() {    
    // update simulation
    fluid.update();
    

// clear render target
pg_fluid.beginDraw();
pg_fluid.background(0);
pg_fluid.endDraw();

// render fluid stuff
fluid.renderFluidTextures(pg_fluid, 0);

// display
image(pg_fluid, 0, 0);

}

视频播放程序（可独立运行）

import processing.video.*;

Movie movie;

void setup() {
  size(560, 406);
  background(0);
  // Load and play the video in a loop
  movie = new Movie(this, "launch2.mp4");
  movie.loop();
}

void movieEvent(Movie m) {
  m.read();
}

void draw() {
  //if (movie.available() == true) {
  //  movie.read(); 
  //}
  image(movie, 0, 0, width, height);
}

              2、经过调整后出现报错

/**
 * Loop. 
 * 
 * Shows how to load and play a QuickTime movie file.  
 *
 */
/**
 * 
 * PixelFlow | Copyright (C) 2016 Thomas Diewald - http://thomasdiewald.com
 * 
 * A Processing/Java library for high performance GPU-Computing (GLSL).
 * MIT License: https://opensource.org/licenses/MIT
 * 
 */


import com.thomasdiewald.pixelflow.java.DwPixelFlow;
import com.thomasdiewald.pixelflow.java.fluid.DwFluid2D;
import processing.video.*;
import processing.core.*;
import processing.opengl.PGraphics2D;


  // Hello World Example for fluid simulations.
  //
  // Controls:
  // LMB/MMB/RMB: add density + Velocity
  //
  
  
  
  // fluid simulation
  DwFluid2D fluid;
  
  // render targets
  PGraphics2D pg_fluid;
  
  public void settings() {
    size(800, 800, P2D);
    Movie movie;
  }
  
  public void setup() {
        
  size(560, 406);
  background(0);
  // Load and play the video in a loop
  movie = new Movie(this, "launch2.mp4");
  movie.loop();
  }
   void movieEvent(Movie m){
  m.read();
}


**  **  // library context
 
错误处❌>    1、DwPixelFlow context = new DwPixelFlow(this);
                     2、 context.print();
                      3、context.printGL();
    
    // fluid simulation

>     4、fluid = new DwFluid2D(context, width, height, 1,);
****
    
    // some fluid parameters
    fluid.param.dissipation_velocity = 0.70f;
    fluid.param.dissipation_density  = 0.99f;

    // adding data to the fluid simulation
    fluid.addCallback_FluiData(new  DwFluid2D.FluidData(){
      public void update(DwFluid2D fluid) {
        if(mousePressed){
          float px     = mouseX;
          float py     = height-mouseY;
          float vx     = (mouseX - pmouseX) * +15;
          float vy     = (mouseY - pmouseY) * -15;
          fluid.addVelocity(px, py, 14, vx, vy);
          fluid.addDensity (px, py, 20, 0.0f, 0.4f, 1.0f, 1.0f);
          fluid.addDensity (px, py,  8, 1.0f, 1.0f, 1.0f, 1.0f);
        }
      }
    });
   
    // render-target
    pg_fluid = (PGraphics2D) createGraphics(width, height, P2D);
    
    frameRate(60);
  }
  

  public void draw() {    
    // update simulation
    fluid.update();
   
  //if (movie.available() == true) {
  //  movie.read(); 
  //}
  image(movie, 0, 0, width, height);

    // clear render target
    pg_fluid.beginDraw();
   
    pg_fluid.endDraw();
 
    // render fluid stuff
    fluid.renderFluidTextures(pg_fluid, 0);
    
    // display
  image(pg_fluid, 0, 0);
  }

运行结果及报错内容

语法错误 - Error on parameter or method declaration near 'context.print('?

我的解答思路和尝试过的方法

思路：将背景改成透明能显示出下面的视频
尝试方法：1、背景透明化（失败）

我想要达到的结果

目的：流体互动程序附着在视频上方且都能工作