14 Feb 10 推荐一个vim的配色方案desertEx

可以在这里下载：http://vimcolorschemetest.googlecode.com/svn/colors/desertEx.vim

使用方法：

将文件下载到vim目录下的colors。然后在vimrc里面加入colo desertEx就好了。

感觉比默认的desert清爽一点。

效果图：

(more…)

Tags: vim, 配色方案

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12 Feb 10 A small visual tool for the problems of Computational Geomery

I call it vertion 1.0:)

It create a ps file which can be opened by Gsview.

Here it is:

Class of Visual Tool

class Draw {
    private:
        FILE * file;
        P base;
        double rate;
        void moveto(P a) {
            fprintf(file, "%f %f moveto\n", a.x, a.y);
        }
        void lineto(P a) {
            fprintf(file, "%f %f lineto\n", a.x, a.y);
        }
        void show(const char *s) {
            fprintf(file, "(%s) show\n", s);
        }
        P update(P a) {
            return (a + base) * rate;
        }
        void done() {
            fprintf(file, "stroke\nshowpage\n");
            fclose(file);
        }
    public:
        Draw (const char * filename, double minx, double maxx, double miny, double maxy) {
            //file name must be *.ps. The next four arguments form the boundary of the plane.
            base = P(-minx, -miny);
            rate = min(499 / (maxx – minx), 499 / (maxy – miny));
            file = fopen(filename, "w");
            fprintf(file, "/Times-Roman findfont\n");
            fprintf(file, "20 scalefont\n");
            fprintf(file, "setfont\n");
            fprintf(file, "newpath\n");
        }
        ~Draw() {
            done();
        }
        void draw_segment(P a, P b) { //draw a segment.
            moveto(update(a));
            lineto(update(b));
        }
        void draw_line(P a, P b) {//draw a line
            a = update(a);
            b = update(b);
            moveto(a + (b – a).trunc(1000));
            lineto(b + (a – b).trunc(1000));
        }
        void draw_arc(P mid, double r = -1, double deg1 = -180, double deg2 = 180) {
            //draw arc; mid is the center of the circle. r is the radius.
            //deg1, deg2 are the range of the angle. (counter-clockwise).
            //if you want to draw a point just call draw_arc(mid),
            // and if you want to draw a circle, call draw(mid, r).
            r = r == -1? 1: r * rate;
            mid = update(mid);
            moveto(mid + P(cos(deg1 * pi / 180), sin(deg1 * pi / 180)) * r);
            fprintf(file, "%f %f %f %f %f arc\n", mid.x, mid.y, r, deg1, deg2);
        }
        template <class T> void draw_polygon(T s, T t) {//draw a polygon, use it in a way like stl.
            moveto(update(*s));
            while (s != t–) {
                lineto(update(*t));
            }
        }
        void draw_word(P p, const char *s, double sita, double len = 15) {//draw a word.
            //len is the distance between point p and the center of the first letter of the word.
            //sita is the slope of vector (P, center of the first letter).
            sita = sita * pi / 180 – pi / 8;
            moveto(update(p) + P(18 * cos(sita), 18 * sin(sita)));
            show(s);
        }
};