21.5 开放多线段

Annotation 2019-04-15 223227.png

#include <iostream>
#include <sstream>
#include "Graph.h"
#include "GUI.h"
#include "Simple_Window.h"
#include "GUI.h"
#include "Window.h"
struct Lines_window :Window {
    Lines_window(Point xy, int w, int h, const string& title);
    Open_polyline lines;
private:
    Button next_button;
    Button quit_button;
    In_box next_x;
    In_box next_y;
    Out_box xy_out;
    void next();
    void quit();
};
Lines_window::Lines_window(Point xy, int w, int h, const string& title) :
  Window{ xy,w,h,title },
next_button{ Point{x_max() - 150,0 },70,20,"Next Point",
  [](Address,Address pw) {reference_to<Lines_window>(pw).next(); } },
quit_button{ Point{x_max() - 70,0},70,20,"Quit",
  [](Address,Address pw) {reference_to<Lines_window>(pw).quit(); } },
next_x{ Point{x_max() - 310,0},50,20,"next x:" },
next_y{ Point{x_max() - 210,0},50,20,"next y:" },
xy_out{ Point{100,0},100,20,"current(x,y):" }{
    attach(next_button);
    attach(quit_button);
    attach(next_x);
    attach(next_y);
    attach(xy_out);
    attach(lines);
}
void Lines_window::next() {
    int x = next_x.get_int();
    int y = next_y.get_int();
    lines.add(Point{ x,y });
    lines.set_style(Line_style{ Line_style::solid,2 });//不改一下线粗根本看不出来效果
    lines.set_color(Color::dark_green);
    stringstream ss;
    ss << '(' << x << ',' << y << ')';
    xy_out.put(ss.str());
    redraw();
}
void Lines_window::quit() {
    hide();
}
int main() {
        Lines_window win(Point(100, 100), 600, 400, "lines");
        return gui_main();
}