Attachment 5940 Details for Bug 4135 – fails with n is large

fails with n is large

test.c (text/plain), 2.47 KB, created by Simon E Ching on 2006-06-16 11:29:00 UTC

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Creator: Simon E Ching

Created: 2006-06-16 11:29:00 UTC

Size: 2.47 KB

patch

obsolete

>#include<math.h>
>#include<cairo-features.h>
>#include<cairo.h>
>#include<cairo-xlib.h>
>
>void
>plot (cairo_t* cr,
>      int n,
>      double r,
>      int width,
>      int height)
>{
>
>   int i;
>   double pi = 3.141592653589;
>   double d_theta = 2 * pi / n;
>
>   cairo_set_source_rgba (cr, 1, 0, 0, 1);
>   cairo_move_to (cr, width/2 + r * cos (0), height/2 + r * sin (0));
>
>   for (i = 0; i < n; i++)
>   {
>      double theta = i * d_theta;
>      cairo_line_to (cr, width/2 + r * cos (theta), height/2 + r * sin (theta));
>   }
>
>   cairo_close_path (cr);
>   cairo_fill (cr);   
>   //cairo_stroke (cr);   
>
>}
>
>void
>plot_png (int n,
>          double r,
>          int width,
>          int height)
>{
>
>   cairo_t* cr;
>   cairo_surface_t* cs_ptr;
>
>   cs_ptr = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
>   cr = cairo_create (cs_ptr);
>   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);  
>
>   plot (cr, n, r, width, height);
>
>   cairo_surface_write_to_png (cs_ptr, "test.png");
>   cairo_surface_destroy (cs_ptr);
>   cairo_destroy (cr);
>
>}
>
>void
>plot_x (int n,
>        double r,
>        int width,
>        int height)
>{
>
>   GC gc;
>   int screen;
>   Pixmap pixmap;   
>   Display* display;
>   Window root, window;
>   unsigned long pixel;
>
>   cairo_t* cr;
>   cairo_surface_t* cs_ptr;
>
>   display = XOpenDisplay (NULL);
>   screen = DefaultScreen (display);
>   root = DefaultRootWindow (display);
>   pixel = WhitePixel (display, screen);
>   window = XCreateSimpleWindow (display, root,
>      0, 0, width, height, 0, 0, pixel);   
>
>   XMapWindow (display, window);
>   XSelectInput (display, window, StructureNotifyMask);
>
>   pixmap = XCreatePixmap (display, window, width, height,
>      DefaultDepth (display, screen));
>
>   cs_ptr = cairo_xlib_surface_create (display, pixmap,
>      DefaultVisual (display, screen), width, height);
>
>   gc = XCreateGC (display, window, 0, 0); 
>   XCopyArea (display, pixmap, window, gc, 0, 0, width, height, 0, 0);
>   XFlush (display);
>
>   cr = cairo_create (cs_ptr);
>   cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);    
>
>   plot (cr, n, r, width, height);
>
>   XCopyArea (display, pixmap, window, gc, 0, 0, width, height, 0, 0);
>   XFlush (display); 
>
>   sleep (2);
>
>   XFreePixmap (display, pixmap);
>   XDestroyWindow (display, window); 
>
>   cairo_destroy (cr);
>   cairo_surface_destroy (cs_ptr);
>
>}
>
>int
>main (int argc,
>      char** argv)
>{
>
>   int width = 800;
>   int height = 600;
>
>   int n = atoi (argv[1]);
>   plot_x (n, 200, width, height);
>//   plot_png (n, 200, width, height);
>
>};
>

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Attachments on bug 4135: 2918 | 3861 | 3862 | 5940

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