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Sierpinski curve: Difference between revisions

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Sierpinski curve (view source)

Revision as of 15:37, 12 December 2020

470 bytes added ,  3 years ago
m
Refactored C++ code
(Added AutoHotkey)
m (Refactored C++ code)
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#include <string>
 
class sierpinski_curve {
std::string rewrite(const std::string& s) {▼
public:
void write(std::ostream& out, int size, double x, double y,
line(out, x, y, int length, angleint order);▼
private:
▲ static std::string rewrite(const std::string& s) {;
void line(std::ostream& out);
void execute(std::ostream& out, const std::string& s);
double x_;
double y_;
int angle_;
int length_;
};
 
void sierpinski_curve::write(std::ostream& out, int size, double x, double y,
int length, int order) {
length_ = length;
x_ = x;
y_ = y;
angle_ = 45;
out << "<svg xmlns='http://www.w3.org/2000/svg' width='"▼
<< size << "' height='" << size << "'>\n";▼
out << "<rect width='100%' height='100%' fill='white'/>\n";▼
out << "<path stroke-width='1' stroke='black' fill='none' d='";▼
std::string s = "F--XF--F--XF";▼
for (int i = 0; i < order; ++i)▼
s = rewrite(s);▼
execute(out, s, x, y, length, 45);▼
out << "'/>\n</svg>\n";▼
}
 
std::string sierpinski_curve::rewrite(const std::string& s) {
std::string t;
for (char c : s) {
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}
 
void sierpinski_curve::line(std::ostream& out, double& x, double& y, double length, int angle) {
constexpr double pitheta = (3.14159265359 * angle_)/180.0;
double thetax_ += (pilength_ * anglestd::cos(theta)/180.0;
xy_ +-= lengthlength_ * std::cossin(theta);
yout -=<< length" *L" std::sin(theta)<< x_ << ',' << y_;
out << 'L' << x << ',' << y << '\n';
}
 
void sierpinski_curve::execute(std::ostream& out, const std::string& s,) double x, double y,{
out << 'M' << x_ << double length',' int angle)<< {y_;
out << 'M' << x << ',' << y << '\n';
for (char c : s) {
ifswitch (c) == 'F' || c == 'G'){
case 'F':
▲ line(out, x, y, length, angle);
else if (c ==case '+G'):
angle = line(angle + 45out) % 360;
else if (c == '-')break;
case angle = (angle - 45) % 360;'+':
angle_ = (angle_ + 45) % 360;
break;
case '-':
angle_ = (angle_ - 45) % 360;
break;
}
}
}
 
int main() {
const int size = 545;
const int order = 5;
const double x = 5, y = 10, length = 7;
std::ofstream out("sierpinski_curve.svg");
if (!out) {
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return 1;
}
sierpinski_curve s;
▲ out << "<svg xmlns='http://www.w3.org/2000/svg' width='"
s.write(out, 545, 5, 10, 7, 5);
▲ << size << "' height='" << size << "'>\n";
▲ out << "<rect width='100%' height='100%' fill='white'/>\n";
▲ out << "<path stroke-width='1' stroke='black' fill='none' d='";
▲ std::string s = "F--XF--F--XF";
▲ for (int i = 0; i < order; ++i)
▲ s = rewrite(s);
▲ execute(out, s, x, y, length, 45);
▲ out << "'/>\n</svg>\n";
return 0;
}</lang>
 
{{out}}
See: [https://slack-files.com/T0CNUL56D-F017EPDTKS4F01GBK1GF2B-6d6b01b4646c7c86c4e7 sierpinski_curve.svg] (offsite SVG image)
 
=={{header|Factor}}==
Simonjsaunders
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