I'm not sure if this is a major, major bug, or just a flaw in my code, but the
following doesnt seem to draw anything.
#include <fltk/run.h>
#include <fltk/ask.h>
#include <fltk/draw.h>
#include <fltk/Window.h>
using namespace fltk;
class Dragon_Curve : Widget {
int amount, size;
void draw() {
int dragon_x=w()/2,dragon_y=h()/2,dragon_oldx=w()/2,dragon_oldy=h()/2;
char direction=0;
setcolor(BLACK);
for (int i=1;i<=amount;i++) {
dragon_oldx = dragon_x;
dragon_oldy = dragon_y;
switch (direction) {
case 0: dragon_y-=size;break;
case 1: dragon_x-=size;break;
case 2: dragon_y+=size;break;
case 3: dragon_x+=size;break;
}
drawline(x()+dragon_oldx, y()+dragon_oldy,x()+dragon_x, y()+dragon_y);
direction = (direction+dragon_turn(i))%4;
}
}
char dragon_turn(unsigned int n) {
return (((n & -n) << 1) & n) != 0;
}
public:
Dragon_Curve(int x,int y,int w,int h,int amount_,int size_) : Widget
(x,y,w,h) {
amount = amount_;
size = size_;
}
Dragon_Curve(int x,int y,int w,int h,char* l) : Widget (x,y,w,h,l) {
amount = 15;
size = 10;
}
};
int main(int argc, char** argv) {
Window w(700,600);
Dragon_Curve dc(0,0,700,600,15,10);
w.end();
w.show(argc,argv);
return run();
}
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