I have done this in java where I sum the values of the price column/row. But I am wondering how to do this in JavaFX.
I want to sum everything in column 1 and display it in a inputField, I used this to do it in java but how do you do this in JavaFX?
tableview.getValueAt(i, 1).toString();
Here is what I'm trying to do:
int sum = 0;
for (int i = 0; i < tableview.getItems().size(); i++) {
sum = sum + Integer.parseInt(tableview.getValueAt(i, 1).toString());
}
sumTextField.setText(String.valueOf(sum));
If you really have a TableView<Integer>, which seems to be what you are saying in the comments, you can just do
TableView<Integer> table = ... ;
int total = 0 ;
for (Integer value : table.getItems()) {
total = total + value;
}
or, using a Java 8 approach:
int total = table.getItems().stream().summingInt(Integer::intValue);
If you have a more standard set up with an actual model class for your table, then you would need to iterate through the items list and call the appropriate get method on each item, then add the result to the total. E.g. something like
TableView<Item> table = ...;
int total = 0 ;
for (Item item : table.getItems()) {
total = total + item.getPrice();
}
or, again in Java 8 style
int total = table.getItems().stream().summingInt(Item::getPrice);
Both of these assume you have an Item class with a getPrice() method, and the column in question is displaying the price property of each item.
public void totalCalculation (){
double TotalPrice = 0.0;
TotalPrice = Yourtable.getItems().stream().map(
(item) -> item.getMontant()).reduce(TotalPrice, (accumulator, _item) -> accumulator + _item);
TexfieldTotal.setText(String.valueOf(TotalPrice));
}
//getMontant is the getter of your column
Related
I have an assignment for my class that reads like this: Write a class called Stats. The constructor will take no input. There will be a method addData(double a) which will be used to add a value from the test program. Methods getCount(), getAverage() and getStandardDeviation() will return the appropriate values as doubles.
Here's what I have so far:
public class Stats
{
public Stats (double a)
{
a=0.0
}
public void addData(double a)
{
while (
sum=sum+a;
sumsq=sumsq+Math.pow(a,2)
count=count+1
}
public double getCount()
{
return count;
}
public double getAverage()
{
average=sum/count
return average;
}
public double getStandardDeviation()
{
private double sum=o;
private double count=0;
private double sumsq=0;
My problem is figuring out how to calculate the standard deviation using the variables I've defined.
Thanks guys!
You can't do this with the variables you defined. You need to keep the original data to be able to compute the formula
sigma = Math.sqrt( sum(Math.pow(x-mean, 2)) / count )
So,
(1) create private array or list into which you'll add your values in addData. That's all you need to do in addData.
(2) getCount = length of the list
(3) getAverage = sum of values in list / getCount()
(4) getStandardDeviation is something like
double avg = getAverage();
double cnt = getCount();
double sumsq = 0;
for (int i = 0; i < values.Count(); i++) {
sumsq += Math.pow(values[i] - avg, 2);
}
stdev = Math.sqrt(sumsq / cnt);
I am trying to scale a skeleton to match to the sizes of another skeleton.
My algoritm do the following:
Find the distance between two joints of the origin skeleton and the destiny skeleton using phytagorean teorem
divide this two distances to find a multiply factor.
Multiply each joint by this factor.
Here is my actual code:
public static Skeleton ScaleToMatch(this Skeleton skToBeScaled, Skeleton skDestiny)
{
Joint newJoint = new Joint();
double distanciaOrigem = 0;
double distanciaDestino = 0;
double fator = 1;
SkeletonPoint pos = new SkeletonPoint();
foreach (BoneOrientation bo in skToBeScaled.BoneOrientations)
{
distanciaOrigem = FisioKinectCalcs.Distance3DBetweenJoint(skToBeScaled.Joints[bo.StartJoint], skToBeScaled.Joints[bo.EndJoint]);
distanciaDestino = FisioKinectCalcs.Distance3DBetweenJoint(skDestiny.Joints[bo.StartJoint], skDestiny.Joints[bo.EndJoint]);
if (distanciaOrigem > 0 && distanciaDestino > 0)
{
fator = (distanciaDestino / distanciaOrigem);
newJoint = skToBeScaled.Joints[bo.EndJoint]; // escaling only the end joint as the BoneOrientatios starts from HipCenter, i am scaling from center to edges.
// applying the new values to the joint
pos = new SkeletonPoint()
{
X = (float)(newJoint.Position.X * fator),
Y = (float)(newJoint.Position.Y * fator),
Z = (float)(newJoint.Position.Z * fator)
};
newJoint.Position = pos;
skToBeScaled.Joints[bo.EndJoint] = newJoint;
}
}
return skToBeScaled;
}
Every seems to work fine except for the hands and foots
Look at this images
I have my own skeleton over me, and my skeleton scaled to the sizes of another person, but the hands and foots still crazy. (but code looks right)
Any suggestion?
It's hard to say without running the code, but it somewhat "looks good".
What I would validate though, is your
if (distanciaOrigem > 0 && distanciaDestino > 0)
If distanciaOrigem is very close to 0, but even just epsilon away from 0, it won't be picked up by the if, and then
fator = (distanciaDestino / distanciaOrigem);
Will result in a very large number!
I would suggest to smooth the factor so it generally fits the proper scale. Try this code:
private static Dictionary<JointType, double> jointFactors = null;
static CalibrationUtils()
{
InitJointFactors();
}
public static class EnumUtil
{
public static IEnumerable<T> GetValues<T>()
{
return Enum.GetValues(typeof(T)).Cast<T>();
}
}
private static void InitJointFactors()
{
var jointTypes = EnumUtil.GetValues<JointType>();
jointFactors = new Dictionary<JointType, double>();
foreach(JointType type in jointTypes)
{
jointFactors.Add(type, 0);
}
}
private static double SmoothenFactor(JointType jointType, double factor, int weight)
{
double currentValue = jointFactors[jointType];
double newValue = 0;
if(currentValue != 0)
newValue = (weight * currentValue + factor) / (weight + 1);
else
newValue = factor;
jointFactors[jointType] = newValue;
return newValue;
}
When it comes to factor usage just use the SmoothenFactor method first:
public static Skeleton ScaleToMatch(this Skeleton skToBeScaled, Skeleton skDestiny, double additionalFactor = 1)
{
Joint newJoint = new Joint();
double distanceToScale = 0;
double distanceDestiny = 0;
double factor = 1;
int weight = 500;
SkeletonPoint pos = new SkeletonPoint();
Skeleton newSkeleton = null;
KinectHelper.CopySkeleton(skToBeScaled, ref newSkeleton);
SkeletonPoint hipCenterPosition = newSkeleton.Joints[JointType.HipCenter].Position;
foreach(BoneOrientation bo in skToBeScaled.BoneOrientations)
{
distanceToScale = Distance3DBetweenJoints(skToBeScaled.Joints[bo.StartJoint], skToBeScaled.Joints[bo.EndJoint]);
distanceDestiny = Distance3DBetweenJoints(skDestiny.Joints[bo.StartJoint], skDestiny.Joints[bo.EndJoint]);
if(distanceToScale > 0 && distanceDestiny > 0)
{
factor = (distanceDestiny / distanceToScale) * additionalFactor;
newJoint = skToBeScaled.Joints[bo.EndJoint]; // escaling only the end joint as the BoneOrientatios starts from HipCenter, i am scaling from center to edges.
factor = SmoothenFactor(newJoint.JointType, factor, weight);
pos = new SkeletonPoint()
{
X = (float)((newJoint.Position.X - hipCenterPosition.X) * factor + hipCenterPosition.X),
Y = (float)((newJoint.Position.Y - hipCenterPosition.Y) * factor + hipCenterPosition.Y),
Z = (float)((newJoint.Position.Z - hipCenterPosition.Z) * factor + hipCenterPosition.Z)
};
newJoint.Position = pos;
newSkeleton.Joints[bo.EndJoint] = newJoint;
}
}
return newSkeleton;
}
I also modified your ScaleToMatch method as you see. There was a need to move joints in relation to HipCenter position. Also new positions are saved to a new Skeleton instance so they are not used in further vector calculations.
Experiment with the weight but since our bones length is constant you can use big numbers like 100 and more to be sure that wrong Kinect readings do not disturb the correct scale.
Here's an example of how it helped with scaling HandRight joint position:
The weight was set to 500. The resulting factor is supposed to be around 2 (because the base skeleton was purposely downscaled by a factor of 2).
I hope it helps!
How to generate number from 1000 to 9999 with 1 increasing order ?
I tried with Random Class, it is working fine, but instead of generating random number, I want to generate number with in a range.
private int RandomNumber(int min, int max)
{
Random random = new Random();
return random.Next(min, max);
}
Then I call this method :
int returnValue = RandomNumber(5, 20);
You can simply do it this way:
public double RandomNumber(int min, int max)
{
return Random.NextInt(min, max) ;
}
Calling Random.Next(int, int) will give you a random number in that range. You should clarify your question.
How to generate number from 1000 to 9999 with 1 increasing order ?
You can use loop to generate number in range.
for(int i=1000; i < 9999; i++)
{
Console.WriteLine(i);
}
You can use List to store the generated numbers.
List<int> lstNumbers = new List<int>();
for(int i=1000; i < 9999; i++)
{
lstNumbers.Add(i)
}
You can use linq IEnumerable.Range() method as well.
IEnumerable<int> squares = Enumerable.Range(1000 , 9999).Select(x => x * x);
foreach (int num in squares)
{
Console.WriteLine(num);
}
the best way to do SQL Sequence and you call it every time, because the random number process will start over if you restarted IIS.
I am creating a Sudoku Puzzle in asp and I'm having trouble with some classes. When I create a function to display all the numbers in the text box, I get this error: Object reference not set to an instance of an object. I know that it means that my object is null, but here is my code. The line that I am getting the error on is the line that says: stbNumber.setNumber(currentSolution[3 * i + m, 3 * k + n]);
private SudokuTextBox stb;
private Puzzle puzzle;
private Box box;
private Number stbNumber;
public void displayAll(object sender,EventArgs e)
{
puzzle = new Puzzle();
for (int i = 0; i < 3; i++)
{
for (int k = 0; k < 3; k++)
{
box = new Box();
for (int m = 0; m < 3; m++)
{
for (int n = 0; n < 3; n++)
{
stbNumber = new Number();
stb = new SudokuTextBox();
stbNumber.setNumber(currentSolution[3 * i + m, 3 * k + n]);
stb.setTextBoxValue(stbNumber);
stb.setVisibility(true);
box.setItem(stb, m, n);
}// end forth for
}//end third for
puzzle.setItem(box, i, k);
}//end second for
}//end first for
generateBoxes();
}
I have initialized stbNumber at the very top of my code, and I have made sure that currentSolution is not null or empty. I'm therefore unsure as to what I am doing wrong. I also should mention that I have this exact code elsewhere to generate new puzzles and it works just fine, but this section of code specifically gets called when I click a button.
you essentially have 3 possibilities:
stbNumber.setNumber(currentSolution[3 * i + m, 3 * k + n]);
stbNumber could be null
currentSolution could be null
the element you are trying to index could be null--just because currentSolution is not null does not mean the item is at that index is not null--so new one up or take appropriate action
since you new up an instance of stbNumber, it is unlikely to be the culprit (but it could be)
you say you are checking currentSolution is null, I don't see the code for that and from the code you did post it is most likely the culprit here. what you COULD do is add a check for null before you access it, and if your test fails writing an error message somewhere:
stbNumber = new Number();
stb = new SudokuTextBox();
if ( currentSolution != null )
{
// if the item does not exist, new it up
if ( currentSolution[3 * i + m, 3 * k + n] == null ) currentSolution[3 * i + m, 3 * k + n] = new someObject()
stbNumber.setNumber(currentSolution[3 * i + m, 3 * k + n]);
stb.setTextBoxValue(stbNumber);
}
else
{
WriteSomeErrorMessage("currentSolution is null");
}
I need to create an asp.net page that auto generate a brackets tournament tennis style.
Regarding the managing of match in database, it's not a problem.
The problem is the dynamic graphics creation of brackets.
The user will be able to create tournament by 2-4...32 players.
And i don't know ho to create the graphics bracket in html or gdi...
Using Silverlight, and a Grid, You can produce something like this:
To do it, define a regular UserControl containing a Grid. (This is the default when you build a silverlight app in VS2008 with the Silverlight 3.0 SDK).
Then, add a call to the following in the constructor for the user control:
private void SetupBracket(int n)
{
var black = new SolidColorBrush(Colors.Gray);
// number of levels, or rounds, in the single-elim tourney
int levels = (int)Math.Log(n, 2) + 1;
// number of columns in the Grid. There's a "connector"
// column between round n and round n+1.
int nColumns = levels * 2 - 1;
// add the necessary columns to the grid
var cdc = LayoutRoot.ColumnDefinitions;
for (int i = 0; i < nColumns; i++)
{
var cd = new ColumnDefinition();
// the width of the connector is half that of the regular columns
int width = ((i % 2) == 1) ? 1 : 2;
cd.Width = new GridLength(width, GridUnitType.Star);
cdc.Add(cd);
}
var rdc = LayoutRoot.RowDefinitions;
// in the grid, there is one row for each player, and
// an interleaving row between each pair of players.
int totalSlots = 2 * n - 1;
for (int i = 0; i < totalSlots; i++)
{
rdc.Add(new RowDefinition());
}
// Now we have a grid of the proper geometry.
// Next: fill it.
List<int> slots = new List<int>();
ImageBrush brush = new ImageBrush();
brush.ImageSource = new BitmapImage(new Uri("Bridge.png", UriKind.Relative));
// one loop for each level, or "round" in the tourney.
for (int j = 0; j < levels; j++)
{
// Figure the number of players in the current round.
// Since we insert the rounds in the reverse order,
// think of j as the "number of rounds remaining."
// Therefore, when j==0, playersThisRound=1.
// When j == 1, playersThisRound = 2. etc.
int playersThisRound = (int)Math.Pow(2, j);
int x = levels - j;
int f = (int)Math.Pow(2, x - 1);
for (int i = 0; i < playersThisRound; i++)
{
// do this in reverse order. The innermost round is
// inserted first.
var r = new TextBox();
r.Background = black;
if (j == levels - 1)
r.Text = "player " + (i + 1).ToString();
else
r.Text = "player ??";
// for j == 0, this is the last column in the grid.
// for j == levels-1, this is the first column.
// The grid column is not the same as the current
// round, because of the columns used for the
// interleaved connectors.
int k = 2 * (x - 1);
r.SetValue(Grid.ColumnProperty, k);
int m = (i * 2 + 1) * f - 1;
r.SetValue(Grid.RowProperty, m);
LayoutRoot.Children.Add(r);
// are we not on the last round?
if (j > 0)
{
slots.Add(m);
// Have we just inserted two rows? Then we need
// a connector between these two and the next
// round (the round previously added).
if (slots.Count == 2)
{
string xamlTriangle = "<Path xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' "+
"xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' " +
"Data='M0,0 L 100 50 0 100 Z' Fill='LightBlue' Stretch='Fill'/>";
Path path = (Path)System.Windows.Markup.XamlReader.Load(xamlTriangle);
path.SetValue(Grid.ColumnProperty, 2 * (x - 1) + 1);
path.SetValue(Grid.RowProperty, slots[0]);
path.SetValue(Grid.RowSpanProperty, slots[1] - slots[0] + 1);
this.LayoutRoot.Children.Add(path);
slots.Clear();
}
}
}
}
}
In the above, the connector is just an isosceles triangle, with the apex pointing to the right. It is generated by XamlReader.Load() on a string.
You would also want to pretty it up, style it with different colors and fonts, I guess.
You can insert this silverlight "user control" into any HTML web page, something like embedding a flash app into a page. There are silverlight plugins for IE, Firefox, Opera, Safari, and Chrome.
If you don't want to use Silverlight, you could use a similar approach to construct an HTML table.