Cant Get C# Form To Change Red - c#

So I am following the book "C# Game Programming - For Serious Game Creation" and I'm at a part in the book that has you create OpenGL form with Tao and change the color from black to red.
Here is my code which is exactly the same as in the book
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Tao.OpenGl;
namespace GameLoop
{
public partial class Form1 : Form
{
FastLoop _fastLoop;
bool _fullscreen = false;
public Form1()
{
_fastLoop = new FastLoop(GameLoop);
InitializeComponent();
_openGLControl.InitializeContexts();
if (_fullscreen)
{
FormBorderStyle = FormBorderStyle.None;
WindowState = FormWindowState.Maximized;
}
}
void GameLoop(double elapsedTime)
{
Gl.glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT);
Gl.glFinish();
_openGLControl.Refresh();
}
}
}
I am not getting any errors at all, it just simply stays black. What are the possible reasons for why this could be happening?
code for other game loop
static void GameLoop(double elapsedTime)
{
// GameCode goes here
// GetInput
// Process
// Render
System.Console.WriteLine("Loop");
}

Thanks to Ali Kazmi and Matthew I figured it out. by puting the code into public Form1() It worked and I was able to conclude that the method was not updating and Im very new to C# I think it was because the other game loop was not letting it get that far. I removed it and it all works fine.

Related

Drawing a circle on a pictureBox from another winform

I have two winforms in my application. One of the forms has a picturebox with a jpg loaded of our building plan. The main form has code that does facial recognition identifying people coming into certain areas. I have been asked to modify this program to show an identified individual's location on the building plan. I have a database that has all the X,Y coordinates of the locations that should map to the building plan image. I have looked around and tried to find some code that will draw a circle on the map at the X,Y coordinates as the person progresses through areas of the building by erasing all the existing circles and updating this new one. So on the map form I put in the following code:
public void DrawCircle(int x, int y)
{
Graphics gf = pictureBox1.CreateGraphics();
gf.DrawEllipse(new Pen(Color.Red), new Rectangle(x, y, 400, 400));
pictureBox1.Refresh();
}
Then from the update method (right now a button click for testing) on the main form I call this method on the map form. The method gets called, but the circle doesn't show up on the form. I have tried both Refresh and Invalidate and neither method seems to draw the circle on the image.
I haven't done winforms development for years, so I'm sure I am missing some plumbing somewhere. Here is the code on the mainform:
LocationMap map = new LocationMap();
public Form1()
{
InitializeComponent();
//set up signalR
UserName = "MovementHub1";
ConnectAsync();
//show the map screen
map.Show();
map.WindowState = FormWindowState.Maximized;
...
Then in a click event (for testing right now) I have this code:
private void button2_Click(object sender, EventArgs e)
{
map.DrawCircle(340, 258);
}
Once I get the circle drawn on the other form, then I will remove the code from the click event and move it another event that does the updating on the location. If it's possible, I would like to put a label by the circle that has the person's name. Right now this is a proof of concept, I just need help getting the circle on the form to start with.
Thanks.
I tried It out by myself and came up with that:
Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace StackoverflowHelp
{
public partial class Form1 : Form
{
Form2 form = new Form2();
public Form1()
{
InitializeComponent();
form.Show();
}
private void Button1_Click(object sender, EventArgs e)
{
form.DrawCircle(100, 100);
}
}
}
Form2.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace StackoverflowHelp
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
DrawCircle(10, 10);
}
public void DrawCircle(int x, int y)
{
Graphics gf = Graphics.FromImage(pictureBox1.Image);
gf.DrawEllipse(new Pen(Color.Red), new Rectangle(x, y, 20, 20));
gf.Dispose();
pictureBox1.Refresh();
pictureBox1.Invalidate();
pictureBox1.Update();
}
}
}
Instead of calling CreateGraphics() on the picturebox I created the graphics object using the current image.

How to save an image file using C#?

I'm working with C#, só I start one "Windows Form application" in order to use the "picturebox", where I can draw some things. I would like to know if there's a way to save a file in some kind of file (like JPG). Here's an example, where I draw a simple line in a pictureBox with 300 of Height and 300 of Width.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace AskStack
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
// Here I declare 'MyDraw' and a Pen that I'm gonna use
Graphics MyDraw;
Pen BluePen = new Pen(Color.Blue, 10);
// What happens when I click in my button
private void ButtonDraw_Click(object sender, EventArgs e)
{
MyDraw.Clear(Color.White);
// Here I relate MyDraw to the pictureBox that I have in my Form
MyDraw = pictureBox1.CreateGraphics();
// Here I Just draw a simple line
MyDraw.DrawLine(BluePen, 25, 25, 80, 80);
// I don't know exactly what this does
MyDraw.Save();
}
}
}
I would like to know if there's a way to save this image in a file where I can easily acess it. Also, I would like to know if there's a way to save an JPG file and dimension the file's size WITHOUT using a pictureBox. Thanks!!!
You can try with this line of code:
pictureBox1.Image.Save(#"Path",ImageFormat.Jpeg);

Using Emgu.CV To Detect Faces From Webcam (C#)

I'm building a test application in C# to detect faces from a webcam and
I've built it as a Windows Form with a Timer (timer1), a Picture Box for displaying the webcam output (pictureBox1) and a Textbox for displaying the number of faces (textBox2). I have installed EmguCV through NuGet (v3.1.0.1) and set everything up. Most of the tutorials for EmguCV are for an earlier version, and the necessary HaarCascade class has been depreciated. However, this Stack Overflow question provided me with the necessary updates to my code.
I now have everything set up to work. The webcam displays an updating image in pictureBox1. The detector is supposed to work on the webcam frames every time timer1 ticks over, and the number of rectangles in the Faces[] array is outputted as a string to textBox2. However, nothing seems to be working. I cannot get it to recognise anything. The program is running, but the number of faces detected always says 0. If I initially set the NumberOfFaces variable to something like 5, the Emgu code changes it to 0 in the output. So, something is happening. I'm using the haar xml provided with EmguCV, but no avail. Can anybody help me?
Code dump below:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.Util;
using Emgu.CV.CvEnum;
namespace FaceDetectTest
{
public partial class Form1 : Form
{
public Capture cap;
public CascadeClassifier haar;
public int NumberOfFaces;
public Rectangle[] Faces;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
cap = new Emgu.CV.Capture(0);
haar = new CascadeClassifier(#"C:\Users\Rob\AppData\Roaming\masterbeast\haarcascade_frontalface_alt_tree.xml");
NumberOfFaces = 0;
}
private void timer1_Tick_1(object sender, EventArgs e)
{
using (Image<Bgr, byte> nextFrame = cap.QueryFrame().ToImage<Bgr, Byte>())
{
if (nextFrame != null)
{
Image<Gray, byte> grayframe = nextFrame.Convert<Gray, byte>();
Faces = haar.DetectMultiScale(grayframe, 1.1, 1, new Size(100, 100), new Size(1000, 1000));
NumberOfFaces = Faces.Length;
}
pictureBox1.Image = nextFrame.ToBitmap();
textBox2.Text = NumberOfFaces.ToString();
}
}
}
}
As so often with Stack Overflow, I found a (partial) solution to this some seconds after posting the question.
What seemed to be causing the issue was the conditional statement if (nextFrame != null). I don't know if this has to do with the refresh rate of my webcam, or the timer1 tickover. Removing this now detects faces, though I need to play around with the parameters of the DetectMultiScale method as they only are detected if fully face-on and very close.
If anybody can shed any light on this further, please be my guest; however, it works, and that is all that matters to me. If you are coming here for an example of using Emgu.CV 3.1 for face detection, try the above code without that conditional statement.

C# Moving a cross into a picturebox based on the Thumbstick Position

I want to draw a cross into a picturebox. In the next step I want to move the cross based on my Data.
Which is the Thumbsticks position. I want it to appear similar to the figure below.
Here is my Code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using SlimDX;
using SlimDX.XInput;
namespace Controller_Test
{
public partial class Form1 : Form
{
GamepadState Controller = new GamepadState(UserIndex.One);
Graphics drawArea;
public Form1()
{
InitializeComponent();
timer1.Enabled = true;
drawArea = pictureBox1.CreateGraphics();
}
private void timer1_Tick(object sender, EventArgs e)
{
Controller.Update();
var LeftStick = Controller.LeftStick;
float LeftStickX = LeftStick.Position.X;
float LeftStickY = LeftStick.Position.Y;
Pen blackPen = new Pen(Color.Black);
// horizontal Line
drawArea.DrawLine(blackPen, x1+LeftStickX, y1-LeftStickY, x2+LeftStickX, y2-LeftStickY);
// vertical Line
drawArea.DrawLine(blackPen, x1+LeftStickX, y1-LeftStickY, x2+LeftStickX, y2-LeftStickY);
}
}
public class GamepadState
{Get Postiton......}
}
My problem now is, if I move the Thumbstick every time a new cross is drawn but the old one is still in the
Picturebox like in the figure below. If i use the pictureBox1.Invalidate():/pictureBox1.Refresh(); Funtcion
the cross becomes invisible and is not displayed anymore. The interval of the timer is on 1.
What could i change in order to get the code to work?

Rotate a cube with my method

I have a class with this method
rotire.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UnityEngine;
using System.Collections;
namespace WpfApplication3
{
class rotire:MonoBehaviour
{
float speed = 10f;
public void rotiree()
{
transform.Rotate(new Vector3(15,40,45)*speed,Time.deltaTime);
}
}
}
I want use this method to rotate my cube made in XAML.
Unfortunately it not work and I think my code is incorectly.
Please, can someone help me whit an ideea, what i should write.
Window1,cs
private void Window_Loaded_1(object sender, RoutedEventArgs e)
{
rotire rot = new rotire();
rot.rotiree();
mycube.Transform = rot;
}
I belive the last line of code is wrong, because i receive this error
"Cannot implicitly convert type 'WpfApplication3.rotire' to 'System.Windows.Media.Media3D.Transform3D'"
That last line should be the following:
mycube.Transform = rot.transform;

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