I have searched a bit on the internet and found solutions involving reloading the winforms with Application.DoEvents()
and Control.Invalidate() Control.Update()
But none of it works. I am trying to make program which takes a screenshot and then moves the pixels around randomly to the right. Kind of like a screen melter.
The only problem is that the form only shows when the application is done moving the pixels. How can i force him to show and re-draw whilst he is doing that.
This is the painting method:
// Draw the screenshot...
private void Form1_Paint(object sender, EventArgs e)
{
Bitmap myBitmap = new Bitmap(@".\screenshot.jpg");
int Xcount;
int maxXValue = 1919;
int maxYValue = 1079;
Random random = new Random();
for (Xcount = 0; Xcount < maxXValue; Xcount++)
{
screenshot.Invalidate();
screenshot.Image = myBitmap;
screenshot.Update();
for (int Ycount = 0; Ycount < maxYValue; Ycount++)
{
int calculatedX = Xcount + random.Next(0, maxXValue);
if (calculatedX > maxXValue) calculatedX = maxXValue;
myBitmap.SetPixel(Xcount, Ycount, myBitmap.GetPixel(calculatedX, Ycount));
}
}
}
I tried your code and it refreshes just fine. My guess is that your image location in your Bitmap constructor is incorrect? Test it with a direct path: new Bitmap(@"c:\\yourImgDir\\screenshot.jpg");
and see if that works?
I fixed it using Form1_Load and Form1_Shown, Thanks @Andy Korneyev This is my code now:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace ScreenOutput
{
public partial class Form1 : Form
{
private Bitmap myBitmap = new Bitmap(@".\screenshot.jpg");
private PictureBox screenshot;
private int Xcount;
private int maxXValue = 1919;
private int maxYValue = 1079;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
screenshot.Load(@".\screenshot.jpg");
screenshot.Image = myBitmap;
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
}
private void Form1_Shown(object sender, EventArgs e)
{
Random random = new Random();
for (Xcount = 0; Xcount < maxXValue; Xcount++)
{
screenshot.Invalidate();
screenshot.Update();
for (int Ycount = 0; Ycount < maxYValue; Ycount++)
{
int calculatedX = Xcount + random.Next(0, maxXValue);
if (calculatedX > maxXValue) calculatedX = maxXValue;
myBitmap.SetPixel(Xcount, Ycount, myBitmap.GetPixel(calculatedX, Ycount));
}
}
}
}
}
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