-
September 16th, 2010, 01:17 PM
#1
Visual C++ .NET 2005 Bitmap Problem
I'm trying to learn how to modify Bitmaps programatically.
As a first attempt, I'm trying to simply create a blank bitmap, programatically change it to all red, and display it in a pictureBox.
The following code builds without error and, under "Start Without Debugging" runs without error except the blank pictureBox remains blank - no red bitmap is displayed in it. Any suggestions?
private: System::Void button1_Click(System::Object^ sender,
System::EventArgs^ e)
{
Bitmap^ TempBitmap;
TempBitmap = gcnew Bitmap(33,33);
Color TempColor;
unsigned char cArg;
unsigned char cRed;
unsigned char cGreen;
unsigned char cBlue;
for (int i=0; i<33; i++)
{
for (int j=0; j<33; j++)
{
cArg = 255;
cRed = 255;
cGreen = 0;
cBlue = 0;
TempColor.FromArgb(cArg,cRed,cGreen,cBlue);
TempBitmap->SetPixel(i,j,TempColor);
}
}
pictureBox1->Image = TempBitmap;
label4->Text = "DONE";
}
Yes, I know it's inefficient to put the color assignments inside the loop because they never change. But, since that's where I'll eventually put color modifications coding, they make good placeholders.
M. David Johnson
Edit by admin: no contact info permitted on the forum, thank you
Posting Permissions
- You may not post new threads
- You may not post replies
- You may not post attachments
- You may not edit your posts
-
Forum Rules
|
Click Here to Expand Forum to Full Width
|