I am pretty new in the programming scene and I want to be able to use a button to show random photos in multiple picture boxes. The thing is that I don't want one photo to show in multiple boxes. So every pictureBox should contain different images. I have searched Google for the past few hours but I haven't been able to get any useful information. What I have now, when pressing the button, every pictureBox goes blank. Though here is my code in the button1_Click :
{
List<string> name = new List<string>();
name.Add("0.jpg");
name.Add("1.jpg");
name.Add("2.jpg");
name.Add("3.png");
List<PictureBox> box = new List<PictureBox>();
box.Add(pictureBox1);
box.Add(pictureBox2);
box.Add(pictureBox3);
box.Add(pictureBox4);
a = 4;
ResourceManager rm = MatchGame.Properties.Resources.ResourceManager;
for (int i = 0; i < box.Count; i++)
{
int randomPic = new Random().Next(0, name.Count);
string randomName = name[randomPic];
name.Remove(randomName);
Image img = rm.GetObject(randomName) as Image;
box[i].Image = img;`
}
}
An easy way would be to simply shuffle in random order your name list
List<string> name = new List<string>();
name.Add("0.jpg");
name.Add("1.jpg");
name.Add("2.jpg");
name.Add("3.png");
List<PictureBox> box = new List<PictureBox>();
box.Add(pictureBox1);
box.Add(pictureBox2);
box.Add(pictureBox3);
box.Add(pictureBox4);
// 2 lines code for shuffle every kind of IEnumerable
Random r = new Random();
name = name.OrderBy(x => r.Next()).ToList();
ResourceManager rm = MatchGame.Properties.Resources.ResourceManager;
for (int i = 0; i < box.Count; i++)
{
// no need to remove elements from name list
string randomName = name[i];
Image img = rm.GetObject(randomName) as Image;
box[i].Image = img;`
}
this will assure that every picture picked once and only once (as long, of course, number of pictureboxes is the same of images stored in resource).
Be sure that every rm.GetObject returns a different image.
As a side note, never create a new Random() within a loop: instantiate a single Random and keep calling .Next on it (see this question). The above code would be wrong in this way:
name = name.OrderBy(x => new Random.Next()).ToList();
What you could do is store the picture references in a Dictionary.
Associating the picture names with the PictureBox indexes - then all you need to do is check the dictionary values and see if the picturename is in the dictionary. If it is in the dictionary - then just let the while loop do another loop - to pick another image. To Recycle that all you would need to do is clear the dictionary and the process could start over again.
Dictionary<int, string> MyActivePictures = new Dictionary<int, string>();
Use a concurrentDictionary if you are multithreading.
// Where MyActivePictures < PictureBoxControl , picturename > is the Dictionary
Dictionary<int, string> MyActivePictures = new Dictionary<int, string>();
// i is your PictureBoxes index as you loop through them
int i = 0;
if(box.Count < name.Length){
do
{
int randomPic = new Random().Next(0, name.Count);
string randomName = name[randomPic];
if(!MyActivePictures.Values.Contains[randomName])
{
name.Remove(randomName);
Image img = rm.GetObject(randomName) as Image;
box[i].Image = img;
MyActivePictures[i]=randomName;
i++;
}
if (i > name.Length) // exits the loop in case there are more
{
i = box.Count + 1;
}
}while (i < box.Count);
}
I should add that if it is not possible for the above code to get a unique picture - for example picture boxes > number of images. Then this code will hang in an endless loop. You will need to factor in for that scenario in the while loop - if(the iterator I of pictureboxes value > total images - exit the loop. so if(i > totalimages) exit loop.
I added the additional code to handle this: however
You could just simply include that test in the while condition as well - it is easier ( (i names.Length))
Related
I've a line in the bottom part of the main screen of the game, that every time the scene is loaded, it shows a different tip (how to play, how to change music...).
The question is that I'm using Random.Range for that but, honestly, I'll prefer a way where all tips are showed, one by one in a random way, but without repeating any of them.
My code is as follows:
int randNum;
void Start () {
randNum = Random.Range(0,5);
}
void Update () {
switch (randNum)
{
case 0:
// blah, blah, blah...
case 1...
How can I achieve what I want?
Thans for yout timeeee :)
You can remove the switch statement and store each message in a list.
var tips = new List<string>();
tips.Add("The clouds are white");
...
Then you can randomize the elements in the list (more on that here) and show tips one by one. All you need is to keep track of the index. Example:
// This needs to be a field.
int index = 0;
void ShowTip()
{
// TODO: make sure index is not equal or greater than tips.Count
tip = tips[index];
index++;
// Display the tip
}
What you can do is to shuffle your list of tip. The Fisher-Yates shuffle is one of the most common.
static Random _random = new Random();
static void Shuffle<T>(T[] array)
{
int n = array.Length;
for (int i = 0; i < n; i++)
{
// Use Next on random instance with an argument.
// ... The argument is an exclusive bound.
// So we will not go past the end of the array.
int r = i + _random.Next(n - i);
T t = array[r];
array[r] = array[i];
array[i] = t;
}
}
public static void Main()
{
string[] array = { "tip 1", "tip 2", "tip 3" };
Shuffle(array);
foreach (string value in array)
{
Console.WriteLine(value);
}
}
output
net
dot
perls
source
Suppose your messages are stored in a list of string declared at the global level together with your random class and with an additional List of strings initially empty
List<string> needToDisplayMessages = new List<string>();
List<string> base_messages = new List<string>{"message1","message2","message3","message4","message5"};
Random rnd = new Random();
In your update method check if the list of messages to be displayed is empty and if yes copy the messages from the list with the predefined message. Now use the random instance to choose the index of the message to display and get it from the dynamic list. Finally remove the message from the list of message still to be displayed.
void Update () {
// We refill the list if it is empty
if(needToDisplayMessages.Count == 0)
needToDisplayMessages.AddRange(base_messages);
// Choose a random number topped by the count of messages still to be displayed
int index = rnd.Next(0, needToDisplayMessages.Count);
string message = needToDisplayMessages[index];
..... display the message someway .....
// Remove the message from the list
needToDisplayMessages.RemoveAt(index);
}
Of course, if you want to display the messages in sequential order there is no need of this but (as already explained) just an index. But if you want to randomly choose the message until you have shown all of them and then restart the cycle, perhaps this approach is not too much complex.
Lets say I have 6 image parts that forms a single image when correctly arranged. Also suppose that I have 2 pair of parts that may be interchanged in position and may still form the same image. Now, I want all the possible combinations without permutation. I want to start from 1st place and check how many partials fits that place and incrementally move towards last place.
List<List<int>> possible_combinations = new List<List<int>>();
for (int i = 0; i <= 6; i++)
{
foreach (var comb in possible_combinations)
{
List<int[]> best_combination = new List<int[]>();
for (int p = 0; p < comb.Count; p++)
best_combination.AddRange(allStrokes[comb[p]]);
if (!comb.Contains(i))
{
best_combination.AddRange(allStrokes[i]);
var fits = cs.checkFeasibility(best_combination);
if (fits)
comb.Add(i);
}
}
}
possible combination already may consists of all first possible partial image id. Check feasibility will check if newly combined partial will improve the result so far or not. How can I achieve that. Code herewith is for reference for understanding.
So I'm working in Visual Studio 2015 with a few custom classes. One of which is called MinPriorityQueue, and it is a priority queue that, in this situation, allows me to retrieve the object of MinimumPriority in the queue via a property MinimumPriority. There is also a method called RemoveMinimumPriority, which is self-explanatory.
I am not allowed to modify this method, it was pre-made for us for this assignment, otherwise I would have already found a simple solution.
My program is meant to compare two text files, and return a value based off a certain equation which isn't important as far as this post goes. The problem I am having is within my UserInterface code. Here is my click event for the 'Analyze' button on my GUI.
private void uxAnalyze_Click(object sender, EventArgs e)
{
Dictionary<string, StoreWord> dictionary = new Dictionary<string, StoreWord>();
const int _numFiles = 2;
MinPriorityQueue<float, StoreInfo> minQueue = new MinPriorityQueue<float, StoreInfo>();
int numWords1 = 0;
int numWords2 = 0;
//Process Both Input Files
using (StreamReader sr = new StreamReader(uxTextBox1.Text))
{
for (int i = 0; i < _numFiles; i++)
{
if (i == 0)
{
dictionary = ReadFile(dictionary, uxTextBox1.Text, i, out numWords1);
}
if (i == 1)
{
dictionary = ReadFile(dictionary, uxTextBox2.Text, i, out numWords2);
}
}
}
int[] numWords = new int[2];
numWords[0] = numWords1;
numWords[1] = numWords2;
//Get 50 Words with Highest Combined Frequencies
foreach(var entry in dictionary.Values)
{
StoreInfo freq = new StoreInfo(entry, numWords);
minQueue.Add(freq, Convert.ToSingle(entry[0] + entry[1]));
if(minQueue.Count > 50)
{
minQueue.RemoveMinimumPriority();
}
}
//Compute and Display the Difference Measure
float diffMeasure = 0;
float temp = 0;
foreach( x in minQueue)
for (int i = 0; i < minQueue.Count; i++)
{
temp += minQueue.????; //This is where my problem stems
}
diffMeasure = (float)(100 * Math.Sqrt(temp));
}
A few lines from the end you will see a comment showing where my problem is located. The MinPriorityQueue (minQueue) has two parameters, a Priority, and a Value, where the Priority is a Float, and the Value is another class called StoreInfo. This class has an Indexer, which will return information from a different file depending on what the index is. In this case, there are only two files. For example: StoreInfo[i] returns the frequency of a word in the ith text file.
Ideally, my code would look like this:
for (int i = 0; i < minQueue.Count; i++)
{
temp += (minQueue.minimumValue[0] - minQueue.minimumValue[1])*(minQueue.minimumValue[0] - minQueue.minimumValue[1]);
}
diffMeasure = (float)(100 * Math.Sqrt(temp));
Problem is, that would require a minimumValue property, which I don't have access to. All I have is minimumPriority.
As far as I can see, there is no other way for me to get the Values that I need in order to get the frequencies that I need to get from the indexer and put into the equation.
Help is much appreciated.
Alright guys, I've been thinking at this for far too long, and it doesn't seem like anyone else sees another solution either.
At this point, I'm just going to go with the logical solution and add another property into the MinPriorityQueue class, even though it is against my professor's wishes.
Thank you all anyway.
Imagine that I have a grid with 3 columns and 2 rows. I want to take a picture of what is inside the column 2-3 and row 1. Is this possible?
Right now I am able to take a screenshot to my plot graph with this method
private void Capture()
{
SaveFileDialog dlg = new SaveFileDialog();
dlg.FileName = "hello";
dlg.Filter = "JPEG (*.jpg)|*.jpg|PNG (*.png)";
dlg.FilterIndex = 1;
if (dlg.ShowDialog().GetValueOrDefault(false))
{
string filePath = dlg.FileName;
plotter.SaveScreenshot(filePath);
e.Handled = true;
}
}
Where plotter is a ChartPlotter (a class in DynamicDataDisplay), it has a method called "SaveScreenshot".
But it only takes the screenshot of that particular plotter. My idea is to have several plotters and be able to make a screenshot to all of them. For that I can put them into a StackPanel or a grid and take a picture of that element as whole (that contains all my plotters).
yes it is. I don't know in what case exactly you would like to use it. but if you just want to save it in a nother array for example you could do this with for loops. for your example only one loop is needed:
int[,] array = new int[2,3];
static int[,] ScreenShot(int row, int colum1, int colum2)
{
int[,] temp = new int[colum2-colum1, 1];
for (int i = 0; i < colum2-colum1; i++)
{
temp[i,1] = array[i+colum1,row];
}
}
if you want it to have more rows, you could extend it.
This woudn't be the fastest or nicest solution, but you could make an array of plotters, then create a temporary array of small pictures (would use something more lossless then jpg) and combine them at the end. Would this work for you?
I'm a C# newbie and I'm really confused about something I'm trying to do for a project in a C# class.
The assignment is some list manipulation in C#.
The program accepts a list of items in the text box, then iterates through those items, creating multiple copies of the list. It randomly resizes each copy of the list to between 3 and all items. It then outputs all the copies.
The problem I'm having is that when I step through this program with the debugger, I get the expected output. The same happens if I display a message box after each iteration (as I have in the code below).
However, if I just run the program straight through, I get a different output. Instead of variations in the lists, all the copies of the list are exactly the same.
If you see in the code I've commented "// FIRST DEBUG MESSAGEBOX" and "// SECOND DEBUG MESSAGEBOX". If the first debug messagebox code is left in there, the output is as expected...multiple versions of the list are output with random lengths between 3 and all items.
However, and this is where I'm confused...if you comment out the first debug messagebox code, you get a different result. All versions of the list output are the same length with no variation.
Any help would be appreciated! Here's the code I have so far...sorry if it's terrible - I'm new at C#:
public partial class MainForm : Form
{
/**
* Vars to hold raw text list items
* and list items split by line
*/
String rawListItems = "";
List<string> listItems = new List<string>();
List<List<string>> textListItems = new List<List<string>>();
public MainForm()
{
InitializeComponent();
}
private void cmdGo_Click(object sender, EventArgs e)
{
// store the contents of the list item text box
this.rawListItems = txtListItems.Text;
this.listItems.AddRange(Regex.Split(this.rawListItems, "\r\n"));
// setup min and max items - max items all items
int minItems = 3;
int maxItems = this.listItems.Count;
// We'll copy this list X times, X = same number of items in list
for (int i = 0; i < this.listItems.Count; i++)
{
// make a copy of the list items
List<string> listItemsCopy = new List<string>(this.listItems);
// get a random number between min items and max items
Random random = new Random();
int maxIndex = random.Next(minItems, maxItems + 1); // max is exclusive, hence the +1
// remove all elements after the maxIndex
for (int j = 0; j < listItemsCopy.Count; j++)
{
if (j > maxIndex)
{
listItemsCopy.RemoveAt(j);
}
}
// add the list copy to the master list
this.textListItems.Add(listItemsCopy);
// FIRST DEBUG MESSAGEBOX
String tst = "";
foreach (string item in listItemsCopy)
{
tst += item + " ## ";
}
MessageBox.Show(tst);
}
// SECOND DEBUG MESSAGEBOX
String output = "";
foreach (List<string> listitem in this.textListItems)
{
foreach (string item in listitem)
{
output += item + " ## ";
}
}
MessageBox.Show(output);
}
}
Move the creation of Random out of the loop:
Random random = new Random();
By default, the constructor uses a default time based seed. In a tight loop, you may be getting 'the same' random generator instead of a different one with each loop.
When using MessageBoxes or single stepping, you are allowing the timer to run and getting 'a new' random generator in each loop.
I don't understand your assignment exactly, but this loop seems to be incorrect:
for (int j = 0; j < listItemsCopy.Count; j++)
{
if (j > maxIndex)
{
listItemsCopy.RemoveAt(j);
}
}
when you remove an element in the middle of a list, elements after that get shifted, so not all the elements after maxIndex get removed, as you might expect.
In circumstances where stepping through the code in a debugger affects the behaviour of the program, a useful alternative debugging technique is to use the System.Diagnostics namespace in particular the Trace class.
The Trace functions work much like Console.WriteLine(), you can trace a string or a format string plus an array of objects to populate the format string, e.g.:
Trace.TraceInformation("some message that tells me something");
Trace.TraceInformation("some useful format string {1}, {0}",
new object[] {someObject, someOtherObject});