/*******************************************************************************
* The "New BSD License" : http://www.opensource.org/licenses/bsd-license.php *
********************************************************************************
Copyright (c) 2010, Mark Turney
All rights reserved.
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modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
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* Neither the name of the <organization> nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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******************************************************************************/
#ifndef SIMPLE_SVG_HPP
#define SIMPLE_SVG_HPP
#include <vector>
#include <string>
#include <sstream>
#include <fstream>
#include <iostream>
namespace svg
{
// Utility XML/String Functions.
template <typename T>
std::string attribute(std::string const & attribute_name,
T const & value, std::string const & unit = "")
{
std::stringstream ss;
ss << attribute_name << "=\"" << value << unit << "\" ";
return ss.str();
}
std::string elemStart(std::string const & element_name)
{
return "\t<" + element_name + " ";
}
std::string elemEnd(std::string const & element_name)
{
return "</" + element_name + ">\n";
}
std::string emptyElemEnd()
{
return "/>\n";
}
// Quick optional return type. This allows functions to return an invalid
// value if no good return is possible. The user checks for validity
// before using the returned value.
template <typename T>
class optional
{
public:
optional<T>(T const & type)
: valid(true), type(type) { }
optional<T>() : valid(false), type(T()) { }
T * operator->()
{
// If we try to access an invalid value, an exception is thrown.
if (!valid)
throw std::exception();
return &type;
}
// Test for validity.
bool operator!() const { return !valid; }
private:
bool valid;
T type;
};
struct Dimensions
{
Dimensions(double width, double height) : width(width), height(height) { }
Dimensions(double combined = 0) : width(combined), height(combined) { }
double width;
double height;
};
struct Point
{
Point(double x = 0, double y = 0) : x(x), y(y) { }
double x;
double y;
};
optional<Point> getMinPoint(std::vector<Point> const & points)
{
if (points.empty())
return optional<Point>();
Point min = points[0];
for (unsigned i = 0; i < points.size(); ++i) {
if (points[i].x < min.x)
min.x = points[i].x;
if (points[i].y < min.y)
min.y = points[i].y;
}
return optional<Point>(min);
}
optional<Point> getMaxPoint(std::vector<Point> const & points)
{
if (points.empty())
return optional<Point>();
Point max = points[0];
for (unsigned i = 0; i < points.size(); ++i) {
if (points[i].x > max.x)
max.x = points[i].x;
if (points[i].y > max.y)
max.y = points[i].y;
}
return optional<Point>(max);
}
// Defines the dimensions, scale, origin, and origin offset of the document.
struct Layout
{
enum Origin { TopLeft, BottomLeft, TopRight, BottomRight };
Layout(Dimensions const & dimensions = Dimensions(400, 300), Origin origin = BottomLeft,
double scale = 1, Point const & origin_offset = Point(0, 0))
: dimensions(dimensions), scale(scale), origin(origin), origin_offset(origin_offset) { }
Dimensions dimensions;
double scale;
Origin origin;
Point origin_offset;
};
// Convert coordinates in user space to SVG native space.
double translateX(double x, Layout const & layout)
{
if (layout.origin == Layout::BottomRight || layout.origin == Layout::TopRight)
return layout.dimensions.width - ((x + layout.origin_offset.x) * layout.scale);
else
return (layout.origin_offset.x + x) * layout.scale;
}
double translateY(double y, Layout const & layout)
{
if (layout.origin == Layout::BottomLeft || layout.origin == Layout::BottomRight)
return layout.dimensions.height - ((y + layout.origin_offset.y) * layout.scale);
else
return (layout.origin_offset.y + y) * layout.scale;
}
double translateScale(double dimension, Layout const & layout)
{
return dimension * layout.scale;
}
class Serializeable
{
public:
Serializeable() { }
virtual ~Serializeable() { };
virtual std::string toString(Layout const & layout) const = 0;
};
class Color : public Serializeable
{
public:
enum Defaults { Transparent = -1, Aqua, Black, Blue, Brown, Cyan, Fuchsia,
Green, Lime, Magenta, Orange, Purple, Red, Silver, Gray, White, Yellow };
Color(int r, int g, int b) : transparent(false), red(r), green(g), blue(b) { }
Color(Defaults color)
: transparent(false), red(0), green(0), blue(0)
{
switch (color)
{
case Aqua: assign(0, 255, 255); break;
case Black: assign(0, 0, 0); break;
case Blue: assign(0, 0, 255); break;
case Brown: assign(165, 42, 42); break;
case Cyan: assign(0, 255, 255); break;
case Fuchsia: assign(255, 0, 255); break;
case Green: assign(141, 208, 141); break;
case Lime: assign(203, 227, 127); break;
case Magenta: assign(255, 0, 255); break;
case Orange: assign(255, 165, 0); break;
case Purple: assign(128, 0, 128); break;
case Red: assign(255, 0, 0); break;
case Silver: assign(192, 192, 192); break;
case Gray: assign(128,128,128); break;
case White: assign(255, 255, 255); break;
case Yellow: assign(255, 255, 0); break;
default: transparent = true; break;
}
}
virtual ~Color() { }
std::string toString(Layout const &) const
{
std::stringstream ss;
if (transparent)
ss << "transparent";
else
ss << "rgb(" << red << "," << green << "," << blue << ")";
return ss.str();
}
private:
bool transparent;
int red;
int green;
int blue;
void assign(int r, int g, int b)
{
red = r;
green = g;
blue = b;
}
};
class Fill : public Serializeable
{
public:
Fill(Color::Defaults color) : color(color) { }
Fill(Color color = Color::Transparent)
: color(color) { }
std::string toString(Layout const & layout) const
{
std::stringstream ss;
ss << attribute("fill", color.toString(layout));
return ss.str();
}
private:
Color color;
};
class Stroke : public Serializeable
{
public:
Stroke(double width = -1, Color color = Color::Transparent)
: width(width), color(color) { }
std::string toString(Layout const & layout) const
{
// If stroke width is invalid.
if (width < 0)
return std::string();
std::stringstream ss;
ss << attribute("stroke-width", translateScale(width, layout)) << attribute("stroke", color.toString(layout));
return ss.str();
}
private:
double width;
Color color;
};
class Font : public Serializeable
{
public:
Font(double size = 12, std::string const & family = "Verdana") : size(size), family(family) { }
std::string toString(Layout const & layout) const
{
std::stringstream ss;
ss << attribute("font-size", translateScale(size, layout)) << attribute("font-family", family);
return ss.str();
}
private:
double size;
std::string family;
};
class Shape : public Serializeable
{
public:
Shape(Fill const & fill = Fill(), Stroke const & stroke = Stroke())
: fill(fill), stroke(stroke) { }
virtual ~Shape() { }
virtual std::string toString(Layout const & layout) const = 0;
virtual void offset(Point const & offset) = 0;
protected:
Fill fill;
Stroke stroke;
};
template <typename T>
std::string vectorToString(std::vector<T> collection, Layout const & layout)
{
std::string combination_str;
for (unsigned i = 0; i < collection.size(); ++i)
combination_str += collection[i].toString(layout);
return combination_str;
}
class Circle : public Shape
{
public:
Circle(Point const & center, double diameter, Fill const & fill,
Stroke const & stroke = Stroke())
: Shape(fill, stroke), center(center), radius(diameter / 2) { }
std::string toString(Layout const & layout) const
{
std::stringstream ss;
ss << elemStart("circle") << attribute("cx", translateX(center.x, layout))
<< attribute("cy", translateY(center.y, layout))
<< attribute("r", translateScale(radius, layout)) << fill.toString(layout)
<< stroke.toString(layout) << emptyElemEnd();
return ss.str();
}
void offset(Point const & offset)
{
center.x += offset.x;
center.y += offset.y;
}
private:
Point center;
double radius;
};
class Elipse : public Shape
{
public:
Elipse(Point const & center, double width, double height,
Fill const & fill = Fill(), Stroke const & stroke = Stroke())
: Shape(fill, stroke), center(center), radius_width(width / 2),
radius_height(height / 2) { }
std::string toString(Layout const & layout) const
{
std::stringstream ss;
ss << elemStart("ellipse") << attribute("cx", translateX(center.x, layout))
<< attribute("cy", translateY(center.y, layout))
<< attribute("rx", translateScale(radius_width, layout))
<< attribute("ry", translateScale(radius_height, layout))
<< fill.toString(layout) << stroke.toString(layout) << emptyElemEnd();
return ss.str();
}
void offset(Point const & offset)
{
center.x += offset.x;
center.y += offset.y;
}
private:
Point center;
double radius_width;
double radius_height;
};
class Rectangle : public Shape
{
public:
Rectangle(Point const & edge, double width, double height,
Fill const & fill = Fill(), Stroke const & stroke = Stroke())
: Shape(fill, stroke), edge(edge), width(width),
height(height) { }
std::string toString(Layout const & layout) const
{
std::stringstream ss;
ss << elemStart("rect") << attribute("x", translateX(edge.x, layout))
<< attribute("y", translateY(edge.y, layout))
<< attribute("width", translateScale(width, layout))
<< attribute("height", translateScale(height, layout))
<< fill.toString(layout) << stroke.toString(layout) << emptyElemEnd();
return ss.str();
}
void offset(Point const & offset)
{
edge.x += offset.x;
edge.y += offset.y;
}
private:
Point edge;
double width;
double height;
};
class Line : public Shape
{
public:
Line(Point const & start_point, Point const & end_point,
Stroke const & stroke = Stroke())
: Shape(Fill(), stroke), start_point(start_point),
end_point(end_point) { }
std::string toString(Layout const & layout) const
{
std::stringstream ss;
ss << elemStart("line") << attribute("x1", translateX(start_point.x, layout))
<< attribute("y1", translateY(start_point.y, layout))
<< attribute("x2", translateX(end_point.x, layout))
<< attribute("y2", translateY(end_point.y, layout))
<< stroke.toString(layout) << emptyElemEnd();
return ss.str();
}
void offset(Point const & offset)
{
start_point.x += offset.x;
start_point.y += offset.y;
end_point.x += offset.x;
end_point.y += offset.y;
}
private:
Point start_point;
Point end_point;
};
class Polygon : public Shape
{
public:
Polygon(Fill const & fill = Fill(), Stroke const & stroke = Stroke())
: Shape(fill, stroke) { }
Polygon(Stroke const & stroke = Stroke()) : Shape(Color::Transparent, stroke) { }
Polygon & operator<<(Point const & point)
{
points.push_back(point);
return *this;
}
std::string toString(Layout const & layout) const
{
std::stringstream ss;
ss << elemStart("polygon");
ss << "points=\"";
for (unsigned i = 0; i < points.size(); ++i)
ss << translateX(points[i].x, layout) << "," << translateY(points[i].y, layout) << " ";
ss << "\" ";
ss << fill.toString(layout) << stroke.toString(layout) << emptyElemEnd();
return ss.str();
}
void offset(Point const & offset)
{
for (unsigned i = 0; i < points.size(); ++i) {
points[i].x += offset.x;
points[i].y += offset.y;
}
}
private:
std::vector<Point> points;
};
class Polyline : public Shape
{
public:
Polyline(Fill const & fill = Fill(), Stroke const & stroke = Stroke())
: Shape(fill, stroke) { }
Polyline(Stroke const & stroke = Stroke()) : Shape(Color::Transparent, stroke) { }
Polyline(std::vector<Point> const & points,
Fill const & fill = Fill(), Stroke const & stroke = Stroke())
: Shape(fill, stroke), points(points) { }
Polyline & operator<<(Point const & point)
{
points.push_back(point);
return *this;
}
std::string toString(Layout const & layout) const
{
std::stringstream ss;
ss << elemStart("polyline");
ss << "points=\"";
for (unsigned i = 0; i < points.size(); ++i)
ss << translateX(points[i].x, layout) << "," << translateY(points[i].y, layout) << " ";
ss << "\" ";
ss << fill.toString(layout) << stroke.toString(layout) << emptyElemEnd();
return ss.str();
}
void offset(Point const & offset)
{
for (unsigned i = 0; i < points.size(); ++i) {
points[i].x += offset.x;
points[i].y += offset.y;
}
}
std::vector<Point> points;
};
class Text : public Shape
{
public:
Text(Point const & origin, std::string const & content, Fill const & fill = Fill(),
Font const & font = Font(), Stroke const & stroke = Stroke())
: Shape(fill, stroke), origin(origin), content(content), font(font) { }
std::string toString(Layout const & layout) const
{
std::stringstream ss;
ss << elemStart("text") << attribute("x", translateX(origin.x, layout))
<< attribute("y", translateY(origin.y, layout))
<< fill.toString(layout) << stroke.toString(layout) << font.toString(layout)
<< ">" << content << elemEnd("text");
return ss.str();
}
void offset(Point const & offset)
{
origin.x += offset.x;
origin.y += offset.y;
}
private:
Point origin;
std::string content;
Font font;
};
// Sample charting class.
class LineChart : public Shape
{
public:
LineChart(Dimensions margin = Dimensions(), double scale = 1,
Stroke const & axis_stroke = Stroke(.5, Color::Purple))
: axis_stroke(axis_stroke), margin(margin), scale(scale) { }
LineChart & operator<<(Polyline const & polyline)
{
if (polyline.points.empty())
return *this;
polylines.push_back(polyline);
return *this;
}
std::string toString(Layout const & layout) const
{
if (polylines.empty())
return "";
std::string ret;
for (unsigned i = 0; i < polylines.size(); ++i)
ret += polylineToString(polylines[i], layout);
return ret + axisString(layout);
}
void offset(Point const & offset)
{
for (unsigned i = 0; i < polylines.size(); ++i)
polylines[i].offset(offset);
}
private:
Stroke axis_stroke;
Dimensions margin;
double scale;
std::vector<Polyline> polylines;
optional<Dimensions> getDimensions() const
{
if (polylines.empty())
return optional<Dimensions>();
optional<Point> min = getMinPoint(polylines[0].points);
optional<Point> max = getMaxPoint(polylines[0].points);
for (unsigned i = 0; i < polylines.size(); ++i) {
if (getMinPoint(polylines[i].points)->x < min->x)
min->x = getMinPoint(polylines[i].points)->x;
if (getMinPoint(polylines[i].points)->y < min->y)
min->y = getMinPoint(polylines[i].points)->y;
if (getMaxPoint(polylines[i].points)->x > max->x)
max->x = getMaxPoint(polylines[i].points)->x;
if (getMaxPoint(polylines[i].points)->y > max->y)
max->y = getMaxPoint(polylines[i].points)->y;
}
return optional<Dimensions>(Dimensions(max->x - min->x, max->y - min->y));
}
std::string axisString(Layout const & layout) const
{
optional<Dimensions> dimensions = getDimensions();
if (!dimensions)
return "";
// Make the axis 10% wider and higher than the data points.
double width = dimensions->width * 1.1;
double height = dimensions->height * 1.1;
// Draw the axis.
Polyline axis(Color::Transparent, axis_stroke);
axis << Point(margin.width, margin.height + height) << Point(margin.width, margin.height)
<< Point(margin.width + width, margin.height);
return axis.toString(layout);
}
std::string polylineToString(Polyline const & polyline, Layout const & layout) const
{
Polyline shifted_polyline = polyline;
shifted_polyline.offset(Point(margin.width, margin.height));
std::vector<Circle> vertices;
for (unsigned i = 0; i < shifted_polyline.points.size(); ++i)
vertices.push_back(Circle(shifted_polyline.points[i], getDimensions()->height / 30.0, Color::Black));
return shifted_polyline.toString(layout) + vectorToString(vertices, layout);
}
};
class Document
{
public:
Document(std::string const & file_name, Layout layout = Layout())
: file_name(file_name), layout(layout) { }
Document & operator<<(Shape const & shape)
{
body_nodes_str += shape.toString(layout);
return *this;
}
std::string toString() const
{
std::stringstream ss;
ss << "<?xml " << attribute("version", "1.0") << attribute("standalone", "no")
<< "?>\n<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" "
<< "\"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n<svg "
<< attribute("width", layout.dimensions.width, "px")
<< attribute("height", layout.dimensions.height, "px")
<< attribute("xmlns", "http://www.w3.org/2000/svg")
<< attribute("version", "1.1") << ">\n" << body_nodes_str << elemEnd("svg");
return ss.str();
}
bool save() const
{
std::ofstream ofs(file_name.c_str());
if (!ofs.good())
return false;
ofs << toString();
ofs.close();
return true;
}
private:
std::string file_name;
Layout layout;
std::string body_nodes_str;
};
}
#endif
