Processing Forum

Problem with loadJSONObject()

[6 Replies]
- 27-Sep-2013 03:34 AM
- Forum: Programming Questions
when I try and use loadJSONObject(filename)

I have json = loadJSONObject("ufo_awesome.json");

Exactly like in the reference, but every time it gives me an error "loadJSONObject(String) does not exist"

anybody know about this??

please help

thanks

Object that chases another object

[1 Reply]
- 05-Sep-2013 02:07 PM
- Forum: Programming Questions
I was just messing around / experimenting with classes and I wanted to make a cat object with a class, and a dog object which will basically chase the cat around.

I have a seek() method for the dog (like in Nature of Code chapter 6)
but I can't figure out how to make the force that moves the dog

Does anyone Know how to make a basic "force", (kinda like in Nature of Code chapter 2)?

there's probably no reason to put all the code but here it is, sorry for the sloppyness
1. class Dog {
  PVector location;
  PVector velocity;
  PVector acceleration;
  float maxspeed;
  float maxforce;
  float r; // the size
  
  Dog(float x, float y) {
  acceleration = new PVector(0,0);
  velocity = new PVector(0,0);
  location = new PVector(x,y);
  r = 8.0;
  maxspeed = 4;
  maxforce = 0.1;
  }
  void update() {
  velocity.add(acceleration);
  velocity.limit(maxspeed);
  acceleration.mult(0);
  }
  
  void applyForce(PVector force) {
  acceleration.add(force);
  // force.div(mass);
  //force.sub(energy);
  }
  
  void seek(PVector target) {
  PVector desired = PVector.sub(target,location);
  desired.normalize();
  desired.mult(maxspeed);
  
  PVector steer = PVector.sub(desired,velocity);
  steer.limit(maxforce);
  applyForce(steer);
  }
1. void display() {
1. }
  
  //end
  }
Main
1. Cat myCat1;
  Cat myCat2;
  Dog myDog;
  PVector goal;
  void setup() {
  size(300,300);
  //Cat( tempC, tempXpos, tempYpos, tempXspeed, tempXdir, tempYdir) {
  myCat1 = new Cat(color(112,250,86), 50, 10, 1, 1, 1);
  myCat2 = new Cat(color(173,86,250), 50, 100, 2, -1, 1);
  myDog = new Dog(50,50);
  //goal = new PVector(Cat.xpos, Cat.ypos);
  }
  
  void draw() {
  background(0);
  myCat1.live();
  myCat1.display();
  myCat2.live();
  myCat2.display();
  
  goal = new PVector(myCat1.xpos, myCat1.ypos); // IS THAT THE RIGHT WAY TO USE VARIABLES FROM THE OTHER CLASS?
  myDog.applyForce();
  myDog.seek(goal);
  myDog.display();
  
  println(myCat1.xpos);
  }
Cat class
1. class Cat {
  color c;
  float xpos;
  float ypos;
  float xspeed;
  float xdir;
  float ydir;
  int rad = 10;
  
  //
  
  // the constructer is defined with arguments
  //
  Cat(color tempC, float tempXpos, float tempYpos, float tempXspeed, float tempXdir, float tempYdir) {
  c = tempC;
  xpos = tempXpos;
  ypos = tempYpos;
  xspeed = tempXspeed;
  ydir = tempYdir;
  xdir = tempXdir;
  //targeter = new PVector(xpos,ypos);
  }
  
  void display() {
  stroke(0);
  fill(c);
  rectMode(CENTER);
  rect(xpos,ypos,rad,rad);
  }
  
  void live() {
  xpos = xpos + (xspeed * xdir);
  ypos = ypos + (xspeed * ydir);
  if (xpos > width - rad || xpos < rad) {
  xdir *= -1;
  }
  if (ypos > height - rad || ypos < rad) {
  ydir *= -1;
  }
  
  }
  }

Two libraries competing for the same sketch error (with GML4u and toxiclibs)

[0 Replies]
- 21-Aug-2013 07:21 AM
- Forum: Contributed Library Questions
This is just the example sketch from the GML4u library

When I run it gives me an error (in a pop up window) that 2 libraries are competing for the same sketch,

Does anyone know how to fix this?

Thanks

** oh update, I just got the same error in another sketch that isn't using gml4u, just toxic libs.

its says duplicate libraries must be deleted before running the sketch. ???
1. /**
  * GML4U library
  * Author Jerome Saint-Clair
  * http://saint-clair.net
  *
  * This example shows how to iterate through GML strokes
  * and points to draw GML with your own custom style
  *
  */
  
  import toxi.math.conversion.*;
  import toxi.geom.*;
  import toxi.math.*;
  import toxi.geom.mesh2d.*;
  import toxi.util.datatypes.*;
  import toxi.util.events.*;
  import toxi.geom.mesh.subdiv.*;
  import toxi.geom.mesh.*;
  import toxi.math.waves.*;
  import toxi.util.*;
  import toxi.math.noise.*;
  
  import org.apache.log4j.PropertyConfigurator;
  
  import gml4u.brushes.*;
  import gml4u.drawing.*;
  import gml4u.utils.*;
  import gml4u.utils.Timer;
  import gml4u.model.*;
  
  Gml gml;
  Timer timer = new Timer();
  
  int timeMax = 30;
  
  void setup() {
  size(600, 400, P3D);
  PropertyConfigurator.configure(sketchPath+"/log4j.properties");
  
  gml = GmlParsingHelper.getGml(sketchPath+"/sample.gml.xml", false);
  
  GmlUtils.timeBox(gml, timeMax, true);
  timer.start();
  }
  
  void draw() {
  background(0);
  timer.tick();
  for (GmlStroke strok : gml.getStrokes()) {
  for (GmlPoint p : strok.getPoints()) {
  if (p.time > timer.getTime()) {
  continue;
  }
  Vec3D v = new Vec3D(p);
  v.scaleSelf(width);
  fill(random(255), random(255), random(255));
  ellipse(v.x, v.y, random(10,20), random(10, 20));
  }
  }
  }

question about something like a game loop

[4 Replies]
- 10-Aug-2013 05:37 AM
- Forum: Programming Questions
What is the best way to loop through, I guess like a game loop, and move through different levels based on certain events.

So I think I should use a boolean, something like levelcomplete, and some other variable called level? but I'm wondering if

anyone perhaps has a good skeleton or example, because I'm not so good at it :)

So in this code for example, what would be the best way to move to question 2 if question one has been answered?

What I tried to do first was change evaluateAnswer()

like while(level = 1) if (saved.equals(answer1))

level = level 2, etc... but i couldn't get that working and I don't think its right

any advice?
1. void draw() {
  
  background(background);
1. //image(normal, 185, -140);
  image(normal, 210, 200, normal.width/2, normal.height/2);
  textFont(f);
  textSize(60);
  text(question1, 50, 50);
  
  // has user text been entered and sent?
  if (!saved.equals(""))
  {
  // answer has been given now
  evaluateAnswer();
  }
  else
  {
  // wait till answer is complete
  text(typing, 50, 100);
  //text(saved, 50, 150);
  }
  }
  
  void evaluateAnswer() {
  text(saved, 50, 100);
  if (saved.equals(answer1)) {
  
  image(happy, 210, 200, normal.width/2, normal.height/2);
  //correct
  fill(#F258E3);
  text("cool!", 50, 150);
  //fill(255);
  text("Press return \nto play again", 50, 350);
  // player.play();
  }
  else
  {
  image(sad, 210, 200, normal.width/2, normal.height/2);
  //wrong
  fill(255, 2, 2);
  text("wrong", 50, 150);
  //fill(255);
  text("Press return \nto play again", 50, 350);
  //player2.play();
  }
  }
Thanks for any help!
:)

display image based on user input

[3 Replies]
- 09-Aug-2013 12:29 AM
- Forum: Programming Questions
Hello, I'm working on a basic game concept, but I'm having trouble with taking user input (text.)

I want the game to ask a question, then the user answers, if the answer is correct display one image or animation and if its wrong display a different one.

So I have all these png images that are parts of animations and i want to display one according to the text input, later i want to make an animation class and display that.

heres the code now, it takes user input and saves it ( I copied it from the Daniel Shiffman book)

should i edit the draw loop or the key pressed loop?? Any help would be really appreciated thanks!
1. void draw() {
  
  background(background);
  //image(normal, 185, -140);
  image(normal, 210, 200, normal.width/2, normal.height/2);
  textFont(f);
  textSize(60);
  
  // character text
  text(question1, 50, 50);
  
  // user text
  text(typing,50,100);
  text(saved,50,150);
  }
  
  void keyPressed(){
  if (key == '\n' ) {
  saved = typing;
  typing = "";
  
  } else {
  typing = typing + key;
  }
  
  }
so im trying to do something like

while(question = question1)

if ( user text = correct anwser)

display good image;

else

display bad image;

how would i make it "read" the user text and then do something based on that??

I can put all the code here, but i figured the rest isn't really important it just loads a bunch of images and strings, next I want to display different images and strings based on the text

please help :)

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