Creating a New Bitmap

Tutorials > Application Framework > The Bitmap Editor Application > Step 2: Implementing the Document and the View > Creating a New Bitmap

The Bitmap Editor is also able to create new documents, that is, to create new bitmaps. In order to simplify the tutorial, newly-created bitmaps are considered to have a size of 128x128 pixels in this step. Step 4 will show how to introduce a dialog box that lets the user set the bitmap dimensions.

A new document is created when the user performs one of the following actions:

Selection of File > New from the menu bar

Selection of the New button from the main toolbar

CTRL+N accelerator

The association between the user action and the document creation is handled transparently by Application Framework, which calls the BitmapDocument::initializeDocument method. This method creates a new IlvBitmap object and stores it in the bitmap member field of the Bitmap Editor using BitmapDocument::setBitmap:

IlvBoolean

BitmapDocument::initializeDocument(IlvAny data)

{

if (!IlvDvDocument::initializeDocument(data))

return IlvFalse;

IlvDisplay* display = getDisplay();

// Creates the bitmap with a default size of 128x128

IlvDim width = 128;

IlvDim height = 128;

IlvBitmap* bitmap =

new IlvBitmap(display, width, height, display->screenDepth());

setBitmap(bitmap);

// Initialize it with the display palette

setPalette(display->defaultPalette());

getPalette()->invert();

bitmap->fillRectangle(getPalette(), IlvRect(0, 0, width, height));

getPalette()->invert();

return IlvTrue;

}

Published date: 05/24/2022

Last modified date: 02/24/2022