I am getting the following error in my program:
int is not dereferenced
Can someone help?
public void fill() {
int b;
for (b = 0; b < 400; b++) {
if (b.isComposite() == true) { //Error-int is not dereferenced
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
arr[j][i] = b;
}
}
}
}
}
You cannot apply .isComposite() to an integer because it can only be applied to an object. try this.....
for(int b = 0; b < 400; b++) {
if (isComposite(b)) {
//your other code
}
}
Related
I have this .pde program that works perfectly on the Processing software, but when I add it to a webpage it just doesn't load. If I replace the code with any other .pde program it works fine, so inserting .pde programs in an html file is not the issue. I'm not sure if the problem is that it's not loading the external image and file or what. But here's the full code, thank you in advance!
(I also tried converting it to p5.js but it's just way too complicated and I'm not familiar with it!)
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>TITOLO</title>
<script src="processing.js" type="text/javascript"></script>
<link rel="stylesheet" href="css/style1.css">
</head>
<body>
<h1>Titolo – HOME</h1>
<div id="programma">
<script src="https://cdnjs.cloudflare.com/ajax/libs/processing.js/1.6.6/processing.min.js"></script>
<canvas id="pjs"></canvas></div>
<script type="application/processing" data-processing-target="pjs">
final int STAGE_WIDTH = 1200;
final int STAGE_HEIGHT = 950;
final int NB_PARTICLES = 60000;
final float MAX_PARTICLE_SPEED = 5;
final int MIN_LIFE_TIME = 20;
final int MAX_LIFE_TIME = 80;
final String IMAGE_PATH = "starrynight.jpg";
myVector tabParticles[];
float particleSize = 1.2;
PImage myImage;
int imageW;
int imageH;
color myPixels[];
FlowField ff;
GUI gui;
void setup()
{
size(1200, 950, P3D);
background(0);
initializeImage();
initializeParticles();
ff = new FlowField(5);
gui = new GUI(this);
gui.setup();
}
void initializeImage()
{
myImage = loadImage(IMAGE_PATH);
imageW = myImage.width;
imageH = myImage.height;
myPixels = new color[imageW * imageH];
myImage.loadPixels();
myPixels = myImage.pixels;
image(myImage, 0, 0);
}
void setParticle(int i) {
tabParticles[i] = new myVector((int)random(imageW), (int)random(imageH));
tabParticles[i].prevX = tabParticles[i].x;
tabParticles[i].prevY = tabParticles[i].y;
tabParticles[i].count = (int)random(MIN_LIFE_TIME, MAX_LIFE_TIME);
tabParticles[i].myColor = myPixels[(int)(tabParticles[i].y)*imageW + (int)(tabParticles[i].x)];
}
void initializeParticles()
{
tabParticles = new myVector[NB_PARTICLES];
for (int i = 0; i < NB_PARTICLES; i++)
{
setParticle(i);
}
}
void draw()
{
ff.setRadius(gui.getR());
ff.setForce(gui.getF());
particleSize = gui.getS();
float vx;
float vy;
PVector v;
for (int i = 0; i < NB_PARTICLES; i++)
{
tabParticles[i].prevX = tabParticles[i].x;
tabParticles[i].prevY = tabParticles[i].y;
v = ff.lookup(tabParticles[i].x, tabParticles[i].y);
vx = v.x;
vy = v.y;
vx = constrain(vx, -MAX_PARTICLE_SPEED, MAX_PARTICLE_SPEED);
vy = constrain(vy, -MAX_PARTICLE_SPEED, MAX_PARTICLE_SPEED);
tabParticles[i].x += vx;
tabParticles[i].y += vy;
tabParticles[i].count--;
if ((tabParticles[i].x < 0) || (tabParticles[i].x > imageW-1) ||
(tabParticles[i].y < 0) || (tabParticles[i].y > imageH-1) ||
tabParticles[i].count < 0) {
setParticle(i);
}
strokeWeight(1.5*particleSize);
stroke(tabParticles[i].myColor, 250);
line(tabParticles[i].prevX, tabParticles[i].prevY, tabParticles[i].x, tabParticles[i].y);
}
ff.updateField();
}
void mouseDragged() {
if(mouseX>950 && mouseY>830) return;
ff.onMouseDrag();
}
void keyPressed() {
//if (key =='s' || key == 'S') {
// ff.saveField();
//}
}
class myVector extends PVector
{
myVector (float p_x, float p_y) {
super(p_x, p_y);
}
float prevX;
float prevY;
int count;
color myColor;
}
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
class FlowField {
PVector[][] field;
PVector[][] tempField;
int cols, rows;
int resolution;
int affectRadius;
float force;
File file = new File(dataPath("field.txt"));
FlowField(int r) {
resolution = r;
cols = 1200 / resolution;
rows = 950 / resolution;
field = new PVector[cols][rows];
tempField = new PVector[cols][rows];
init();
affectRadius = 3;
force = 1;
}
void setRadius(int r) {
affectRadius = r;
}
void setForce(float f) {
force = f;
}
void init() {
try {
for (int i=0; i<cols; i++) {
for (int j=0; j<rows; j++) {
tempField[i][j] = new PVector(0, 0);
}
}
readField();
}
catch(Exception e) {
for (int i=0; i<cols; i++) {
for (int j=0; j<rows; j++) {
field[i][j] = new PVector(0, 0);
}
}
}
}
PVector lookup(float x, float y) {
int column = int(constrain(x/resolution, 0, cols-1));
int row = int(constrain(y/resolution, 0, rows-1));
return PVector.add(field[column][row],tempField[column][row]);
}
void drawBrush() {
pushStyle();
noFill();
stroke(255, 255, 255);
ellipse(mouseX, mouseY, affectRadius*10, affectRadius*10);
popStyle();
}
void drawField(float x, float y, PVector v) {
int column = int(constrain(x/resolution, 0, cols-1));
int row = int(constrain(y/resolution, 0, rows-1));
for (int i=-affectRadius; i<=affectRadius; i++) {
for (int j=-affectRadius; j<=affectRadius; j++) {
if (i*i+j*j<affectRadius*affectRadius) {
try {
tempField[column+i][row+j].add(v).mult(0.9);
}
catch(Exception e) {
}
}
}
}
}
void updateField(){
for (int i=0; i<cols; i++) {
for (int j=0; j<rows; j++) {
tempField[i][j].mult(0.992);
}
}
}
void onMouseDrag() {
PVector direc = new PVector(mouseX-pmouseX, mouseY-pmouseY).normalize();
drawField(pmouseX, pmouseY, direc.mult(force));
}
void saveField() {
try {
FileWriter out = new FileWriter(file);
for (int i=0; i<cols; i++) {
for (int j=0; j<rows; j++) {
out.write(field[i][j].x+","+field[i][j].y+"\t");
}
out.write("\r\n");
}
out.close();
}
catch(Exception e) {
}
}
void readField() throws IOException {
try {
BufferedReader in = new BufferedReader(new FileReader(file));
String line;
for (int i = 0; (line = in.readLine()) != null; i++) {
String[] temp = line.split("\t");
for (int j=0; j<temp.length; j++) {
String[] xy = temp[j].split(",");
float x = Float.parseFloat(xy[0]);
float y = Float.parseFloat(xy[1]);
field[i][j] = new PVector(x, y);
}
}
in.close();
}
catch(Exception e) {
throw new IOException("no field.txt");
}
}
}
import controlP5.*;
class GUI {
ControlP5 cp5;
Slider sliderR;
Slider sliderF;
Slider sliderS;
GUI(PApplet thePApplet){
cp5 = new ControlP5(thePApplet);
}
void setup(){
cp5.setColorBackground(0x141414);
sliderR = cp5.addSlider("Radius")
.setPosition(980,890)
.setRange(1,20)
.setValue(12).setSize(150,25);
sliderF = cp5.addSlider("Force")
.setPosition(980,918)
.setRange(0.1,0.5)
.setValue(0.3).setSize(150,25);
sliderS = cp5.addSlider("Particle Size")
.setPosition(980,862)
.setRange(0.8,2)
.setValue(1.5).setSize(150,25);
}
int getR(){
return int(sliderR.getValue());
}
float getF(){
return sliderF.getValue();
}
float getS(){
return sliderS.getValue();
}
}
</script>
</body>
Here I'm trying to write a code that can write and create a JSON File for me with the data I provide like row, column and depth.
For example, I need to spawn a 10 x 10 x 10 cube. And I give this data in unity Inspector also in the code when I'm serializing it.
I tried achieving this in a for loop and writing the JSON file. But I'm not getting the output I wanted. I am expecting output where the cube locations are different and in place what happens instead is all the data or cube position in my data is the one before the number I give. that is if I gave my row, column, and depth to be 10. So my data is like x: 9, y: 9, z:9 for the whole 1000 elements.Better explained in image down below.I know I'm doing a mistake at some point just not able to figure out where. Thanks for the help in Advance
public class JSONWriter : MonoBehaviour
{
[SerializeField] int rows , columns, depth = 10;
[SerializeField] float padding;
public enum CubeType
{
white,
yellow,
blue,
red,
green
}
private readonly IReadOnlyDictionary<CubeType, Color> colors = new Dictionary<CubeType, Color>
{
{CubeType.white, Color.white},
{CubeType.yellow, Color.yellow},
{CubeType.blue, Color.blue},
{CubeType.red, Color.red},
{CubeType.green, Color.green}
};
[System.Serializable]
public class CubeData
{
public Vector3 cubePosition;
public CubeType Cube;
}
[System.Serializable]
public class CubeDataList
{
public CubeData[] cubeDatas;
}
public void outputJSON()
{
string strOutput = JsonUtility.ToJson(myCubeDataList);
File.WriteAllText(Application.dataPath + "/Resources/10x10x10.txt", strOutput);
}
//CubeData myCubeData = new CubeData();
public CubeDataList myCubeDataList = new CubeDataList();
void Start()
{
for (int x = 0; x < myCubeDataList.cubeDatas.Length; x++)
{
//Debug.Log(myCubeDataList.cubeDatas.Length);
for (int i = 0; i < depth; i++)
{
for (int j = 0; j < columns; j++)
{
for (int k = 0; k < rows; k++)
{
myCubeDataList.cubeDatas[x].cubePosition = new Vector3(i, j, k) * padding;
//myCubeDataList.cubeDatas[x].Cube = Random.Range(CubeType, 3f);
}
}
}
}
}
}
You do not want to go through all i, j, k for each and every element x!
What you are doing is basically overwriting each and every element with the values for i=9, j=9, k=9.
Instead of an array I would rather simply use a dynamic List like
[Serializable]
public class CubeDataList
{
public List<CubeData> cubeDatas;
}
and then dynamically add them via
myCubeDataList.cubeDatas = new List<CubeData>(i * j * k);
for (int i = 0; i < depth; i++)
{
for (int j = 0; j < columns; j++)
{
for (int k = 0; k < rows; k++)
{
var data = new CubeData();
data.cubePosition = new Vector3(i, j, k) * padding;
data.Cube = Random.Range(CubeType, 3f);
myCubeDataList.cubeDatas.Add(data);
}
}
}
Or if you really want to go with an array
for (int i = 0; i < depth; i++)
{
for (int j = 0; j < columns; j++)
{
for (int k = 0; k < rows; k++)
{
var data = new CubeData();
myCubeDataList.cubeDatas[x].cubePosition = new Vector3(i, j, k) * padding;
myCubeDataList.cubeDatas[x].Cube = Random.Range(CubeType, 3f);
x++;
}
}
}
Though, from your previous question I know you actually do not want to fill the cube completely!
You actually only want the external shape (like a wall) and leave the cube empty on the inside.
So what you actually want would probably rather be
myCubeDataList.cubeDatas = new List<CubeData>(i * j * k);
for (int i = 0; i < depth; i++)
{
for (int j = 0; j < columns; j++)
{
for (int k = 0; k < rows; k++)
{
if(i == 0 || i == depth - 1
|| j == 0 || j == depth - 1
|| k == 0 || k == depth - 1)
{
var data = new CubeData();
data.cubePosition = new Vector3(i, j, k) * padding;
// TODO random enum (see below)
myCubeDataList.cubeDatas.Add(data);
}
}
}
}
For the random enum vlaue see e.g. this answer and do
private Random random = new Random();
and then where it says // TODO insert
var values = Enum.GetValues(typeof(Bar));
data.Cube = (CubeType)values.GetValue(random.Next(values.Length));
I am trying to rearrange the children in a Scroll Container. I have a list collection with the same children and it is in the right order, all I need to do is take the scroll container and make the order of the children the same as the list collections order.
Here is what I am trying currently, the issue I am having is that some items end up in spots they shouldn't be.
menuListCollection.data = Array(e.data)[0];
for(var m:int = 0; m < menuListCollection.length; m++)
{
var child:Object = cardScroller.getChildAt(m);
trace(child.myPageID);
if(menuListCollection.getItemAt(m).MobilePageID != child.myPageID)
{
for (var n:int = 0; n < menuListCollection.length; n++)
{
if(menuListCollection.getItemAt(n).MobilePageID == child.myPageID)
{
cardScroller.setChildIndex(DisplayObject(child), n);
}
}
}
}
If any more details are needed, just ask and I can provide.
Thanks.
Could you do it like this?
menuListCollection.data = Array(e.data)[0];
for(var m:int = 0; m < menuListCollection.length; m++)
{
for (var n:int = 0; n < cardScroller.length; n++)
{
if(menuListCollection.getItemAt(m).MobilePageID == cardScroller.getChildAt(n).myPageID)
{
cardScroller.setChildIndex(DisplayObject(cardScroller.getChildAt(n)), m);
}
}
}
I have the following scenario:
if (event.status == AMFResultEvent.SUCCESS) {
var lev1:uint = 0;
var lev2:uint = 0;
var lev3:uint = 0;
var lev4:uint = 0;
var lev5:uint = 0;
var lev6:uint = 0;
for (var i:int = 0; i < event.result.length; i++) {
if (mainLevel == "1") {
lev1++;
}
if (mainLevel == "2") {
lev2++;
}
if (mainLevel == "3") {
lev3++;
}
if (mainLevel == "4") {
lev4++;
}
if (mainLevel == "5") {
lev5++;
}
if (mainLevel == "6") {
lev6++;
}
}
for (var j:int = 1; j < 7; j++) {
_row = new StatisticsRow(event.result[j], this);
_rowsPlace.addChild(_row);
_row.y = (_row.height +1) * j;
_row.codeLevel.htmlText = j; // works as it should
// need to access variables lev1 - lev6, called by something like "lev"+j here:
_row.amount.htmlText =
}
// traces correct amounts of mainLevels from the i loop:
trace ("level 1: " + lev1);
trace ("level 2: " + lev2);
trace ("level 3: " + lev3);
trace ("level 4: " + lev4);
trace ("level 5: " + lev5);
trace ("level 6: " + lev6);
}
I'm missing something obvious here, as the ["lev"]+j doen't work. How can I dynamically acces the lev1 - lev6 in the j-loop? As the code comment at the bottoms shows, this traces as expected.
Thanks in advance!
You can access them with brackets, string concatenation, and the this keyword. Here's an example of how you would use bracket notation in a loop:
for (var i:int = 0; i <= 6; i++) {
var currLev = this["lev"+i];
// do stuff to currLev
}
Thanks for answering guys!
I had a lousy approach to my problem anyway, and should have used an array right away:
var mainLevels:Array = new Array();
for (var n:int = 1; n < 7; n++) {
mainLevels[n] = 0;
}
if (event.status == AMFResultEvent.SUCCESS) {
for (var i:int = 0; i < event.result.length; i++) {
var data = event.result[i];
var correctCode:String = data["correct"];
var mainLevelFound:uint = uint(correctCode.substr(0, 1));
for (var k:int = 1; k < 7; k++) {
if (k == mainLevelFound) {
mainLevels[k]++;
}
}
}
for (var j:int = 1; j < 7; j++) {
_row = new StatisticsRow(event.result[j], this);
_rowsPlace.addChild(_row);
_row.y = (_row.height +1) * j;
_row.codeLevel.htmlText = j;
// Now this works as a reference to mainLevels[*] created above!
_row.amount.htmlText = mainLevels[j];
}
Thanks again for your effort :)
Suppose we have an array of integers. We've written a function to fetch the index of the first specified value in the array, or -1 if the array does not contain the value..
So for example, if the array = { 4, 5, 4, 4, 7 }, then getFirstIndexOf(4) would return 0, getFirstIndexOf(7) would return 4, and getFirstIndexOf(8) would return -1.
Below, I have presented three different ways to write this function. It is a widely accepted coding standard that returns in the middle of functions, and breaks in the middle of loops are poor practice. It seems to me that this might be an acceptable use for them.
public int getFirstIndexOf(int specifiedNumber) {
for (int i = 0; i < array.length; i++) {
if (array[i] == specifiedNumber) {
return i;
}
}
return -1;
}
VS.
public int getFirstIndexOf(int specifiedNumber) {
int result = -1;
for (int i = 0; i < array.length; i++) {
if (array[i] == specifiedNumber) {
result = i;
break;
}
}
return result;
}
VS.
public int getFirstIndexOf(int specifiedNumber) {
int result = -1;
for (int i = 0; i < array.length; i++) {
if (array[i] == specifiedNumber && result == -1) {
result = i;
}
}
return result;
}
What do you think? Which is best? Why? Is there perhaps another way to do this?
I think it's poor practice to run a full loop when you have already found your result...
If you really want to avoid using return from the middle of the loop, I would sugest to use a "sentinel" to stop your loop.
public int getFirstIndexOf(int specifiedNumber, int[] array) {
boolean found = false;
boolean exit = false;
int i = 0;
int arraySize = array.length();
while(!found && !exit) {
if(array[i] == specifiedNumber) {
found = true;
} else {
if(i++ > arraySize) {
exit = true;
}
}
if(found ==true) {
return i;
} else {
return 99999;
}
}
edit: I hate to indent code using spaces in StackOverflow...
That's why do...while & while loop was invented.
As requested:
public int getFirstIndexOf(int specifiedNumber) {
int i = array.Length;
while(--i > -1 && array[i] != specifiedNumber);
return i;
}