Load image proportionate to button

Question

3.00/5 (1 vote)

See more:

C++

CBitmap bitmap;

bitmap.Attach(image.Detach());

HBITMAP hBitmap6 = (HBITMAP)bitmap.GetSafeHandle();

m_Btn1.SetBitmap(hBitmap6);

but image isn't proportionate to size of button

but image of CButton isn't proportionate to size of my button

What I have tried:

C++

m_Btn1.ShowWindow(SW_SHOW);
m_Btn1.ModifyStyle(0, BS_BITMAP);

CImage image;
HRESULT hr = image.Load(str_path); // just change extension to load jpg

CImageList *pImage;

CBitmap bitmap;

bitmap.Attach(image.Detach());

HBITMAP hBitmap6 = (HBITMAP)bitmap.GetSafeHandle();

BUTTON_IMAGELIST *lst;

pImage = new CImageList;
lst = new BUTTON_IMAGELIST;

pImage->Create(20, 20, ILC_COLOR8, 20, 20);
pImage->Add(&bitmap, RGB(0, 0, 0));

HICON hicon = pImage->ExtractIcon(0);
ICONINFOEX iinfo;
iinfo.cbSize = sizeof(ICONINFOEX);
GetIconInfoEx(hicon, &iinfo);

m_Btn1.SetBitmap(iinfo.hbmColor);

Posted 22-Apr-24 4:54am

Member 14594285

Updated 22-Apr-24 20:32pm

KarstenK

v4

Add a Solution

Comments

jeron1 22-Apr-24 11:19am

Maybe this link will help?
https://stackoverflow.com/questions/2770855/how-do-you-scale-a-cbitmap-object[^]

Member 14594285 22-Apr-24 12:02pm

I solved, thanks

jeron1 22-Apr-24 13:15pm

Great! Perhaps you could flag this thread as 'answered'.

Member 14594285 23-Apr-24 4:21am

I can't because your answer in in the comments

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

merano99 · Answer 1 · 2024-04-23T07:07:00

To display an image with the correct aspect ratio on a button, you must first calculate a common scaling factor, rescale the image with it and finally crop it. The following function performs these steps. The image can be a file or a resource e.g. in jpg format. I have tested the function with an image that is larger than the button.

C++

void RezizeImage(CImage& img_src, CImage& img_dst, int dstW, int dstH)
{
img_dst.Create(dstW, dstH, 32);

HDC hdc_src = img_src.GetDC();
HDC hdc_dst = img_dst.GetDC();
if (!hdc_src || !hdc_dst) // check dcs
return;

int srcW = img_src.GetWidth();
int srcH = img_src.GetHeight();

// calc scale
double s = max((double)dstW / srcW, (double)dstH / srcH);
srcW *= s; srcH *= s;

// calc ofset
int ofsH=0, ofsW = 0;
if (srcH != dstH) 
	ofsH = (dstH - srcH) / 2;
else
	ofsW = (dstW - srcW) / 2;

SetStretchBltMode(hdc_src, COLORONCOLOR);
SetStretchBltMode(hdc_dst, COLORONCOLOR);
img_src.StretchBlt(hdc_src, 0, 0, srcW, srcH, SRCCOPY);  // resize
img_src.BitBlt(hdc_dst, ofsW, ofsH, SRCCOPY);       // crop

img_src.ReleaseDC();
img_dst.ReleaseDC();
}

It may also be possible to optimize the program.