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- #include "Graph.h"
- #include<map>
- namespace Graph_lib {
- void Shape::draw_lines() const
- {
- if (color().visibility() && 1<points.size()) // draw sole pixel?
- for (unsigned int i=1; i<points.size(); ++i)
- fl_line(points[i-1].x,points[i-1].y,points[i].x,points[i].y);
- }
- void Shape::draw() const
- {
- Fl_Color oldc = fl_color();
- // there is no good portable way of retrieving the current style
- fl_color(lcolor.as_int());
- fl_line_style(ls.style(),ls.width());
- draw_lines();
- fl_color(oldc); // reset color (to pevious) and style (to default)
- fl_line_style(0);
- }
- // does two lines (p1,p2) and (p3,p4) intersect?
- // if se return the distance of the intersect point as distances from p1
- inline pair<double,double> line_intersect(Point p1, Point p2, Point p3, Point p4, bool& parallel)
- {
- double x1 = p1.x;
- double x2 = p2.x;
- double x3 = p3.x;
- double x4 = p4.x;
- double y1 = p1.y;
- double y2 = p2.y;
- double y3 = p3.y;
- double y4 = p4.y;
- double denom = ((y4 - y3)*(x2-x1) - (x4-x3)*(y2-y1));
- if (denom == 0){
- parallel= true;
- return pair<double,double>(0,0);
- }
- parallel = false;
- return pair<double,double>( ((x4-x3)*(y1-y3) - (y4-y3)*(x1-x3))/denom,
- ((x2-x1)*(y1-y3) - (y2-y1)*(x1-x3))/denom);
- }
- //intersection between two line segments
- //Returns true if the two segments intersect,
- //in which case intersection is set to the point of intersection
- bool line_segment_intersect(Point p1, Point p2, Point p3, Point p4, Point& intersection){
- bool parallel;
- pair<double,double> u = line_intersect(p1,p2,p3,p4,parallel);
- if (parallel || u.first < 0 || u.first > 1 || u.second < 0 || u.second > 1) return false;
- intersection.x = p1.x + u.first*(p2.x - p1.x);
- intersection.y = p1.y + u.first*(p2.y - p1.y);
- return true;
- }
- void Polygon::add(Point p)
- {
- int np = number_of_points();
- if (1<np) { // check that thenew line isn't parallel to the previous one
- if (p==point(np-1)) error("polygon point equal to previous point");
- bool parallel;
- line_intersect(point(np-1),p,point(np-2),point(np-1),parallel);
- if (parallel)
- error("two polygon points lie in a straight line");
- }
- for (int i = 1; i<np-1; ++i) { // check that new segment doesn't interset and old point
- Point ignore(0,0);
- if (line_segment_intersect(point(np-1),p,point(i-1),point(i),ignore))
- error("intersect in polygon");
- }
- Closed_polyline::add(p);
- }
- void Polygon::draw_lines() const
- {
- if (number_of_points() < 3) error("less than 3 points in a Polygon");
- Closed_polyline::draw_lines();
- }
- void Open_polyline::draw_lines() const
- {
- if (fill_color().visibility()) {
- fl_color(fill_color().as_int());
- fl_begin_complex_polygon();
- for(int i=0; i<number_of_points(); ++i){
- fl_vertex(point(i).x, point(i).y);
- }
- fl_end_complex_polygon();
- fl_color(color().as_int()); // reset color
- }
- if (color().visibility())
- Shape::draw_lines();
- }
- void Closed_polyline::draw_lines() const
- {
- Open_polyline::draw_lines();
- if (color().visibility()) // draw closing line:
- fl_line(point(number_of_points()-1).x,point(number_of_points()-1).y,point(0).x,point(0).y);
- }
- void Shape::move(int dx, int dy)
- {
- for (unsigned int i = 0; i<points.size(); ++i) {
- points[i].x+=dx;
- points[i].y+=dy;
- }
- }
- void Lines::draw_lines() const
- {
- // if (number_of_points()%2==1) error("odd number of points in set of lines");
- if (color().visibility())
- for (int i=1; i<number_of_points(); i+=2)
- fl_line(point(i-1).x,point(i-1).y,point(i).x,point(i).y);
- }
- void Text::draw_lines() const
- {
- int ofnt = fl_font();
- int osz = fl_size();
- fl_font(fnt.as_int(),fnt_sz);
- fl_draw(lab.c_str(), point(0).x, point(0).y);
- fl_font(ofnt,osz);
- }
- Function::Function(Fct f, double r1, double r2, Point xy, int count, double xscale, double yscale)
- // graph f(x) for x in [r1:r2) using count line segments with (0,0) displayed at xy
- // x coordinates are scaled by xscale and y coordinates scaled by yscale
- {
- if (r2-r1<=0) error("bad graphing range");
- if (count<=0) error("non-positive graphing count");
- double dist = (r2-r1)/count;
- double r = r1;
- for (int i = 0; i<count; ++i) {
- add(Point(xy.x+int(r*xscale),xy.y-int(f(r)*yscale)));
- r += dist;
- }
- }
- void Rectangle::draw_lines() const
- {
- if (fill_color().visibility()) { // fill
- fl_color(fill_color().as_int());
- fl_rectf(point(0).x,point(0).y,w,h);
- fl_color(color().as_int()); // reset color
- }
- if (color().visibility()) { // edge on top of fill
- fl_color(color().as_int());
- fl_rect(point(0).x,point(0).y,w,h);
- }
- }
- Axis::Axis(Orientation d, Point xy, int length, int n, string lab)
- :label(Point(0,0),lab)
- {
- if (length<0) error("bad axis length");
- switch (d){
- case Axis::x:
- { Shape::add(xy); // axis line
- Shape::add(Point(xy.x+length,xy.y)); // axis line
- if (1<n) {
- int dist = length/n;
- int x = xy.x+dist;
- for (int i = 0; i<n; ++i) {
- notches.add(Point(x,xy.y),Point(x,xy.y-5));
- x += dist;
- }
- }
- // label under the line
- label.move(length/3,xy.y+20);
- break;
- }
- case Axis::y:
- { Shape::add(xy); // a y-axis goes up
- Shape::add(Point(xy.x,xy.y-length));
- if (1<n) {
- int dist = length/n;
- int y = xy.y-dist;
- for (int i = 0; i<n; ++i) {
- notches.add(Point(xy.x,y),Point(xy.x+5,y));
- y -= dist;
- }
- }
- // label at top
- label.move(xy.x-10,xy.y-length-10);
- break;
- }
- case Axis::z:
- error("z axis not implemented");
- }
- }
- void Axis::draw_lines() const
- {
- Shape::draw_lines(); // the line
- notches.draw(); // the notches may have a different color from the line
- label.draw(); // the label may have a different color from the line
- }
- void Axis::set_color(Color c)
- {
- Shape::set_color(c);
- notches.set_color(c);
- label.set_color(c);
- }
- void Axis::move(int dx, int dy)
- {
- Shape::move(dx,dy);
- notches.move(dx,dy);
- label.move(dx,dy);
- }
- void Circle::draw_lines() const
- {
- if (fill_color().visibility()) { // fill
- fl_color(fill_color().as_int());
- fl_pie(point(0).x,point(0).y,r+r-1,r+r-1,0,360);
- fl_color(color().as_int()); // reset color
- }
- if (color().visibility()) {
- fl_color(color().as_int());
- fl_arc(point(0).x,point(0).y,r+r,r+r,0,360);
- }
- }
- void Ellipse::draw_lines() const
- {
- if (fill_color().visibility()) { // fill
- fl_color(fill_color().as_int());
- fl_pie(point(0).x,point(0).y,w+w-1,h+h-1,0,360);
- fl_color(color().as_int()); // reset color
- }
- if (color().visibility()) {
- fl_color(color().as_int());
- fl_arc(point(0).x,point(0).y,w+w,h+h,0,360);
- }
- }
- void draw_mark(Point xy, char c)
- {
- static const int dx = 4;
- static const int dy = 4;
- string m(1,c);
- fl_draw(m.c_str(),xy.x-dx,xy.y+dy);
- }
- void Marked_polyline::draw_lines() const
- {
- Open_polyline::draw_lines();
- for (int i=0; i<number_of_points(); ++i)
- draw_mark(point(i),mark[i%mark.size()]);
- }
- /*
- void Marks::draw_lines() const
- {
- for (int i=0; i<number_of_points(); ++i)
- fl_draw(mark.c_str(),point(i).x-4,point(i).y+4);
- }
- */
- std::map<string,Suffix::Encoding> suffix_map;
- int init_suffix_map()
- {
- suffix_map["jpg"] = Suffix::jpg;
- suffix_map["JPG"] = Suffix::jpg;
- suffix_map["jpeg"] = Suffix::jpg;
- suffix_map["JPEG"] = Suffix::jpg;
- suffix_map["gif"] = Suffix::gif;
- suffix_map["GIF"] = Suffix::gif;
- suffix_map["bmp"] = Suffix::bmp;
- suffix_map["BMP"] = Suffix::bmp;
- return 0;
- }
- Suffix::Encoding get_encoding(const string& s)
- // try to deduce type from file name using a lookup table
- {
- static int x = init_suffix_map();
- string::const_iterator p = find(s.begin(),s.end(),'.');
- if (p==s.end()) return Suffix::none; // no suffix
- string suf(p+1,s.end());
- return suffix_map[suf];
- }
- bool can_open(const string& s)
- // check if a file named s exists and can be opened for reading
- {
- ifstream ff(s.c_str());
- return bool(ff);
- }
- // somewhat overelaborate constructor
- // because errors related to image files can be such a pain to debug
- Image::Image(Point xy, string s, Suffix::Encoding e)
- :w(0), h(0), fn(xy,"")
- {
- add(xy);
- if (!can_open(s)) {
- fn.set_label("cannot open \""+s+'\"');
- p = new Bad_image(30,20); // the "error image"
- return;
- }
- if (e == Suffix::none) e = get_encoding(s);
- switch(e) {
- case Suffix::jpg:
- p = new Fl_JPEG_Image(s.c_str());
- break;
- case Suffix::gif:
- p = new Fl_GIF_Image(s.c_str());
- break;
- // case Suffix::bmp:
- // p = new Fl_BMP_Image(s.c_str());
- // break;
- default: // Unsupported image encoding
- fn.set_label("unsupported file type \""+s+'\"');
- p = new Bad_image(30,20); // the "error image"
- }
- }
- void Image::draw_lines() const
- {
- if (fn.label()!="") fn.draw_lines();
- if (w&&h)
- p->draw(point(0).x,point(0).y,w,h,cx,cy);
- else
- p->draw(point(0).x,point(0).y);
- }
- } // Graph
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