Canvas.hpp

Manage an HTML canvas object.

class Canvas : public internal::WidgetFacet<Canvas>

#include <Canvas.hpp>

Manage an HTML Canvas object.

Public Types

using INFO_TYPE = CanvasInfo

Public Functions

inline Canvas(double w, double h, const std::string &in_id = ""): Create a new canvas with the specified size and optional HTML identifier.

inline Canvas(const Canvas &in): Link to an existing canvas.

inline Canvas(const Widget &in)

inline Canvas()

inline virtual ~Canvas()

inline void SetSize(double w, double h): Set Canvas size.

template<typename ...Ts> inline Canvas &Circle(Point center, double _r, Ts&&... vals): Add a Circle to this canvas; provide constructor for the CanvasCircle with a position and radius as well as optional face color, line color, and line width.

template<typename ...Ts> inline Canvas &Circle(double _x, double _y, double _r, Ts&&... vals)

template<typename ...Ts> inline Canvas &Rect(Point corner, double w, double h, Ts&&... vals): Add a Rectangle to this canvas at x,y with width w and heigh h. Optional face color and line color.

template<typename ...Ts> inline Canvas &Rect(double x, double y, double w, double h, Ts&&... vals)

template<typename ...Ts> inline Canvas &Image(const RawImage &image, Point corner, Ts&&... vals): Add an Image to this canvas at x,y with width w and heigh h.

template<typename ...Ts> inline Canvas &Image(const RawImage &image, double x, double y, Ts&&... vals)

template<typename ...Ts> inline Canvas &Line(double x1, double y1, double x2, double y2, Ts&&... vals): Add a Line from x1,y1 to x2,y2. Optional face color and line color.

template<typename ...Ts> inline Canvas &Line(Point p1, Point p2, Ts&&... vals)

template<typename ...Ts> inline Canvas &MultiLine(Point p1, const vector<Point> &points, Ts&&... vals): Add a Line from x1,y1 to x2,y2. Optional face color and line color.

template<typename ...Ts> inline Canvas &Text(Point p, Ts&&... vals): Add a string to this canvas at x,y with specified text. Optional face color and line color.

template<typename ...Ts> inline Canvas &Text(double x, double y, Ts&&... vals)

template<typename ...Ts> inline Canvas &CenterText(Point p, Ts&&... vals): Add a string to this canvas centered at x,y with specified text. Optional face color and line color.

template<typename ...Ts> inline Canvas &CenterText(double x, double y, Ts&&... vals)

inline Canvas &Font(const std::string font): Update the default font for text.

inline Canvas &Draw(const Circle &circle, const std::string &fc = "", const std::string &lc = ""): Draw a circle onto this canvas.

inline Canvas &Draw(const CanvasShape &shape): Draw an arbitrary shape onto this canvas.

inline Canvas &StrokeColor(std::string c): Change the default stroke color.

inline Canvas &Rotate(double angle): Rotate the entire canvas.

inline Canvas &Clear(): Clear everything off of this canvas.

inline Canvas &Clear(const std::string &bg_color): Clear to a specific background color.

inline void DownloadPNG() const: Download a PNG image of a canvas.

inline void DownloadPNG(const std::string &fname) const: Download a PNG image of a canvas.

inline void SavePNG(const std::string &fname) const: Save a PNG image of a canvas with node.js.

Protected Functions

inline CanvasInfo *Info()

inline const CanvasInfo *Info() const

inline Canvas(CanvasInfo *in_info)

Friends

friend class CanvasInfo