C-language version of GDI + application example-colormatrix

This example shows several typical applications of the colormatrix of GDI +:

# Include ".. /.. /samplecode/comcode/application. H "</P> <p> # pragma hdrstop </P> <p> # defineid_rease100 <br/> # defineid_alpha101 <br/> # defineid_bright102 <br/> # defineid_gray103 <br/> # define id_two104 <br/> # defineid_invert105 </P> <p> pgpbitmap bitmap; <br/> pgpimageattr ATTR; <br/> rect drect; <br/> hfont = NULL; </P> <p> void createbutton (lptstr caption, int top, int Itemid, hfont) <br/>{< br/> hwnd hbutton = createwindow (text ("button"), caption, ws_child | ws_visible, <br/> 488, top, 80, 25, handle, (hmenu) Itemid, hinstance, null); <br/> sendmessage (hbutton, wm_setfont, (wparam) (hfont), 0 ); <br/>}</P> <p> void oncreate (void) <br/> {<br/> hfont = createfont (14, 0, 0, 0, fw_normal, <br/> false, gb2312_charset, out_default_precis, <br/> clip_default_precis, default_quality, ff_decorative, text (" ")); </P> <p> createbutton (text ("Translucent"), 30, id_alpha, hfont); <br/> createbutton (text ("brightness 20%"), 65, id_bright, hfont); <br/> createbutton (text ("grayscale"), 100, id_gray, hfont ); <br/> createbutton (text ("binarization"), 135, id_two, hfont); <br/> createbutton (text ("Reversed"), 170, id_invert, hfont); <br/> createbutton (text ("reset"), 205, id_rease, hfont); </P> <p> bitmap = bitmapfromfile (L ".. //.. // media // source.jpg ", false); <br/> ATTR = imageattrcreate (); <br/> drect = makerect (0, 0, imagegetwidth (Bitmap ), imagegetheight (Bitmap); <br/>}</P> <p> void ondestroy (void) <br/>{< br/> If (hfont) <br/> deleteobject (hfont); <br/> imagedelete (Bitmap); <br/> imageattrdelete (ATTR ); <br/>}</P> <p> void oncommand (word policycode, word Itemid, hwnd ctlhandle) <br/>{< br/> colormatrix matrix; <br/> int I; <br/> memset (& matrix, 0, sizeof (colormatrix); <br/> for (I = 0; I <5; I ++) <br/> matrix. M [I] [I] = 1.0f; <br/> imageattrreset (ATTR, coloradjusttypedefault); <br/> switch (Itemid) <br/>{< br/> case id_rease: <br/> invalidaterect (handle, & drect, false); <br/> return; <br/> case id_alpha: <br/> matrix. M [3] [3] = 0.5f; <br/> break; <br/> case id_bright: <br/> matrix. M [4] [0] = matrix. M [4] [1] = matrix. M [4] [2] = 0.2f; <br/> break; <br/> case id_gray: <br/> case id_two: <br/> matrix. M [0] [0] = matrix. M [0] [1] = matrix. M [0] [2] = 0.30f; <br/> matrix. M [1] [0] = matrix. M [1] [1] = matrix. M [1] [2] = 0.59f; <br/> matrix. M [2] [0] = matrix. M [2] [1] = matrix. M [2] [2] = 0.11f; <br/> break; <br/> case id_invert: <br/> matrix. M [0] [0] = matrix. M [1] [1] = matrix. M [2] [2] =-1.0f; <br/> break; <br/>}< br/> imageattrsetcolormatrix (ATTR, & matrix, colormatrixflagsdefault, coloradjusttypedefault ); <br/> If (Itemid = id_two) <br/> imageattrsetthreshold (ATTR, 0.5, coloradjusttypedefault); <br/> invalidaterect (handle, & drect, false ); <br/>}</P> <p> void onpaint (hdc dc) <br/>{< br/> pgpgraphics G = graphicscreate (DC ); // GDI + canvas <br/> graphicsdrawimagerectrect (G, bitmap, & drect, 0, 0, drect. width, drect. height, unitpixel, ATTR); <br/> graphicsdelete (g); <br/>}</P> <p> winapi winmain (hinstance, hinstance hprevinstance, lpstr lpcmdline, int ncmdshow) <br/>{< br/> // The Double Buffer painting window is used here */<br/> initapplication (hinstance, ncmdshow, true ); <br/> createproc = oncreate; <br/> destroyproc = ondestroy; <br/> paintproc = onpaint; <br/> commandproc = oncommand; <br/> return runapplication (text ("C language gdiplus demo -- colormatrix"), 582,392); <br/>}< br/> // example //---------------------------------------------------------------------------

For the window framework code used by the example code and the GDI + C language version, see "using GDI + in C Windows Applications".

The following figure shows the example running interface:

For more information about GDI + colormatrix, see the complete secrets of GDI + colormatrix and the color adjustment matrix colormatrix basics of GDI + for VCL.

Please send to: mao.maozefa@gmail.com, maozefa@hotmail.com