Hi,
Your example seems ok, but of course I have no idea what is in the
file you load in, whether it loaded fine, or in what manner "it
failed".
From the manual:
> Polygon
>
> This function takes an array of integer values containing the
> coordinates of the vertexes of a polygon. Note that if you want a
> closed polygon, you must repeat the first point's coordinates for
> the last point. It also requires the number of points contained in
> the array. For example, if you wish to plot a triangle, the array
> will contain 6 elements, and the number of points is 3. Be very
> careful about this; if you specify the wrong number of points, your
> program will either segfault or produce points at nonsensical
> coordinates. The colour components are either doubles from 0.0 to
> 1.0 or ints from 0 to 65535.
>
>
> void polygon( int * points, int number_of_points,
> double red, double green, double blue);
> void polygon( int * points, int number_of_points,
> int red, int green, int blue);
Here's the code I used when I wrote the poly function.
> #include <pngwriter.h>
>
>
> int main()
> {
> int pts[8];
>
> pts[0] = 9;
> pts[1] = 190;
>
> pts[2] = 50;
> pts[3] = 50;
>
> pts[4] = 199;
> pts[5] = 150;
>
> pts[6] = 9;
> pts[7] = 190;
>
> pngwriter image(200,200,0,"out-double.png");
> image.square(20,10,40,40,1.0,0.0,0.0);
> image.circle(100,100,50,1.0,0.0,0.0);
>
> pngwriter image2(200,200,0,"out-int.png");
> image2.square(20,10,40,40,1.0,0.0,0.0);
> image2.circle(100,100,50,1.0,0.0,0.0);
>
> image.boundary_fill( 30,12,65535,0,0,0,65535,0);
> image2.boundary_fill( 30,12,1.0,0.0,0.0,0.0,1.0,0.0);
> std::cout << "Done boundary." << std::endl;
> image.flood_fill( 1,1,0,65535,0);
> image2.flood_fill( 1,1,0.0,1.0,0.0);
> std::cout << "Done fill." << std::endl;
> image.polygon( pts, 4,65535,0,65535);
> image2.polygon( pts, 4,1.0,0.0,1.0);
> std::cout << "Done poly." << std::endl;
>
> image.flood_fill( 50,150,65535,0,0);
> image2.flood_fill( 50,150,1.0,0.0,0.0);
>
> image.close();
> image2.close();
>
>
>
> return 0;
>
> }
Good luck.
Paul
On 25 Jul 2006, at 21:30, hu ting wrote:
> hello,everyone. pngwriter is a good tool to plot image. now I need use
> the polygon mothod, and I found
> ---------------------
> void polygon( int * points, int number_of_points,
>
> double red, double green, double blue);
>
> void polygon( int * points, int number_of_points,
>
> int red, int green, int blue);
> ---------------------
> but I can not find any example. I try like this
> -----------------
> ....
> int *pn=new int[pnum*2];
> for(int i=0;i {
> int p;
> ifile>>p;
> pn[i*2]=(int)px[p]*100;
> pn[i*2+1]=(int)py[p]*100;
> }
> image.polygon(pn,pnum,1.0,0.0,0,0);
> ......
> ---------------------
> but failed:(
>
> who can give me a example of the polygon?? thanks a lot!
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