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#! /usr/bin/env octave
printf("OpenCV Octave version of drawing\n");
## import the necessary things for OpenCV
cv;
highgui;
function ret=random_color ()
ret = CV_RGB(int32(rand()*255), int32(rand()*255), int32(rand()*255));
endfunction
## some "constants"
width = 1000;
height = 700;
window_name = "Drawing Demo";
number = 100;
delay = 5;
line_type = cv.CV_AA; # change it to 8 to see non-antialiased graphics
## create the source image
image = cv.cvCreateImage (cv.cvSize (width, height), 8, 3);
## create window and display the original picture in it
highgui.cvNamedWindow (window_name, 1);
cv.cvSetZero (image);
highgui.cvShowImage (window_name, image);
## draw some lines
for i=0:number-1,
pt1 = cv.cvPoint (int32(rand() * 2 * width - width),
int32(rand() * 2 * height - height));
pt2 = cv.cvPoint (int32(rand() * 2 * width - width),
int32(rand() * 2 * height - height));
cv.cvLine (image, pt1, pt2,
random_color (),
int32(rand() * 10),
line_type, 0);
highgui.cvShowImage (window_name, image);
highgui.cvWaitKey (delay);
endfor
## draw some rectangles
for i=0:number-1,
pt1 = cv.cvPoint (int32(rand() * 2 * width - width),
int32(rand() * 2 * height - height));
pt2 = cv.cvPoint (int32(rand() * 2 * width - width),
int32(rand() * 2 * height - height));
cv.cvRectangle (image, pt1, pt2,
random_color (),
int32(rand() * 10 - 1),
line_type, 0);
highgui.cvShowImage (window_name, image);
highgui.cvWaitKey (delay);
endfor
## draw some ellipes
for i=0:number-1,
pt1 = cv.cvPoint (int32(rand() * 2 * width - width),
int32(rand() * 2 * height - height));
sz = cv.cvSize (int32(rand() * 200),
int32(rand() * 200));
angle = rand() * 1000 * 0.180;
cv.cvEllipse (image, pt1, sz, angle, angle - 100, angle + 200,
random_color (),
int32(rand() * 10 - 1),
line_type, 0);
highgui.cvShowImage (window_name, image);
highgui.cvWaitKey (delay);
endfor
## init the list of polylines
nb_polylines = 2;
polylines_size = 3;
pt = cell(1, nb_polylines);
for a=1:nb_polylines,
pt{a} = cell(1,polylines_size);
endfor
## draw some polylines
for i=0:number-1,
for a=1:nb_polylines,
for b=1:polylines_size,
pt {a}{b} = cv.cvPoint (int32(rand() * 2 * width - width), \
int32(rand() * 2 * height - height));
endfor
endfor
cv.cvPolyLine (image, pt, 1, random_color(), int32(rand() * 8 + 1), line_type, 0);
highgui.cvShowImage (window_name, image);
highgui.cvWaitKey (delay);
endfor
## draw some filled polylines
for i=0:number-1,
for a=1:nb_polylines,
for b=1:polylines_size,
pt {a}{b} = cv.cvPoint (int32(rand() * 2 * width - width),
int32(rand() * 2 * height - height));
endfor
endfor
cv.cvFillPoly (image, pt, random_color (), line_type, 0);
highgui.cvShowImage (window_name, image);
highgui.cvWaitKey (delay);
endfor
## draw some circles
for i=0:number-1,
pt1 = cv.cvPoint (int32(rand() * 2 * width - width),
int32(rand() * 2 * height - height));
cv.cvCircle (image, pt1, int32(rand() * 300), random_color (), \
int32(rand() * 10 - 1), line_type, 0);
highgui.cvShowImage (window_name, image);
highgui.cvWaitKey (delay);
endfor
## draw some text
for i=0:number-1,
pt1 = cv.cvPoint (int32(rand() * 2 * width - width), \
int32(rand() * 2 * height - height));
font = cv.cvInitFont (int32(rand() * 8), \
rand() * 100 * 0.05 + 0.01, \
rand() * 100 * 0.05 + 0.01, \
rand() * 5 * 0.1, \
int32(rand() * 10), \
line_type);
cv.cvPutText (image, "Testing text rendering!", \
pt1, font, \
random_color ());
highgui.cvShowImage (window_name, image);
highgui.cvWaitKey (delay);
endfor
## prepare a text, and get it's properties
font = cv.cvInitFont (cv.CV_FONT_HERSHEY_COMPLEX, \
3, 3, 0.0, 5, line_type);
[text_size, ymin] = cv.cvGetTextSize ("OpenCV forever!", font);
pt1.x = int32((width - text_size.width) / 2);
pt1.y = int32((height + text_size.height) / 2);
image2 = cv.cvCloneImage(image);
## now, draw some OpenCV pub ;-)
for i=0:255-1,
cv.cvSubS (image2, cv.cvScalarAll (i), image, []);
cv.cvPutText (image, "OpenCV forever!",
pt1, font, cv.cvScalar (255, i, i));
highgui.cvShowImage (window_name, image);
highgui.cvWaitKey (delay);
endfor
## wait some key to end
highgui.cvWaitKey (0);