Example 4-1 ...... Example 4-2 draw a rectangle with the mouse in the window

// Example 4-1 draw a rectangle with the mouse in the window </P> <p> # include "stdafx. H "<br/> # include <cv. h> <br/> # include <pighgui. h> <br/> # include <stdlib. h> </P> <p> void my_mouse_callback (INT event, int X, int y, int flag, void * PARAM); <br/> cvrect box; <br/> bool drawing_box = false; </P> <p> void draw_box (iplimage * IMG, cvrect rect) <br/>{< br/> cvrectangle (IMG, cvpoint (box. x, box. y), cvpoint (box. X + box. width, box. Y + box. height), cvscalar (0xff, 0x00,0x00); <br/>}< br/> int main (INT argc, char ** argv) <br/> {<br/> box = cvrect (-1,-1200,700, 0); <br/> iplimage * imge = cvcreateimage (cvsize (), ipl_depth_8u, 3); <br/> cvzero (imge); <br/> iplimage * temp = cvcloneimage (imge); <br/> cvnamedwindow ("box example "); <br/> cvsetmousecallback ("box example", my_mouse_callback, (void *) imge); <br/> while (1) <br/>{< br/> cvcopyimage (imge, temp); <br/> If (drawing_box) <br/>{< br/> draw_box (temp, box ); <br/>}< br/> cvshowimage ("box example", temp); <br/> If (cvwaitkey (15) = 27) <br/>{< br/> break; <br/>}</P> <p> cvreleaseimage (& imge ); <br/> cvreleaseimage (& temp); <br/> cvdestroywindow ("box example"); </P> <p> // char jieshu; <br/> // scanf (& jieshu); <br/> return 0; <br/>}</P> <p> void my_mouse_callback (INT event, int X, int y, int flag, void * PARAM) <br/>{< br/> iplimage * image = (iplimage *) Param; <br/> switch (Event) <br/>{< br/> case cv_event_mousemove: <br/>{< br/> If (drawing_box) <br/>{< br/> box. width = x-box.x; <br/> box. height = y-box.y; <br/>}< br/> break; <br/> case cv_event_lbuttondown: <br/>{< br/> drawing_box = true; <br/> box = cvrect (X, Y, 0, 0); <br/>}< br/> break; <br/> case cv_event_lbuttonup: <br/>{< br/> drawing_box = false; <br/> If (box. width <0) <br/>{< br/> box. X + = Box. width; <br/> box. width * =-1; <br/>}< br/> If (box. height <0) <br/>{< br/> box. Y + = Box. height; <br/> box. height * =-1; <br/>}< br/> draw_box (image, box); <br/>}< br/> break; <br/>}</P> <p> // Example 4-2 use a slider to implement the switch </P> <p> # include "stdafx. H "<br/> # include <cv. h> <br/> # include <pighgui. h> </P> <p> int g_switch_value = 0; </P> <p> void switch_callback (INT position) <br/>{< br/> If (position = 0) <br/>{< br/> switch_off_function (); <br/>}< br/> else <br/> {<br/> switch_on_function (); <br/>}</P> <p> int _ tmain (INT argc, _ tchar * argv []) <br/>{< br/> cvnamedwindow ("demo window", 1); <br/> cvcreatetrackbar ("Switch", "demo window", & g_switch_value, 1, switch_callback (); <br/> while (1) <br/> {<br/> If (cvwaitkey (15) = 27) <br/>{< br/> break; <br/>}< br/> return 0; <br/>}</P> <p>

 

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