Delphi's drawing function [14]

The Graphic unit of Delphi has five important image classes: Tgraphic, Tbitmap, Tmetafile, Ticon, Tpicture.

Tbitmap used to manipulate bitmaps;

Tmetafile is used to manipulate metafile;

Ticon used to manipulate icons (including mouse pointer) files;

Tbitmap, Tmetafile, and Ticon are all tgraphic subclasses, because

Tcanvas.draw (X, Y:integer; Graphic:tgraphic); The third parameter is the tgraphic type,

So they all can be output through Tcanvas.draw.

If three kinds of images have to accommodate, you have to use the Tpicture class, it contains Bitmap, Metafile, Icon object properties, also contains Graphic object attributes; The Timage class also contains the Picture property, so the image format can be displayed with Timage.

Among these, my favorite class is Tbitmap, because it is equivalent to a memory board, and double caching is used.