Source: Draw Rounded Rectangle

Draw rounded rectangles

Summary

This is a class for SFML 2, that provides an easy interface for rounded rectagles. It behaves like your used to from other sf::Shapes. The class was written by Overdrivr.

Source

Header

////////////////////////////////////////////////////////////
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////

#ifndef ROUNDEDRECTANGLESHAPE_HPP
#define ROUNDEDRECTANGLESHAPE_HPP

////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Graphics/Shape.hpp>

namespace sf
{
////////////////////////////////////////////////////////////
/// \brief Specialized shape representing a rectangle
/// with rounded corners
////////////////////////////////////////////////////////////
class RoundedRectangleShape : public sf::Shape
{
    public:
        ////////////////////////////////////////////////////////////
        /// \brief Default constructor
        ///
        /// \param size Size of the rectangle
        /// \param radius Radius for each rounded corner
        /// \param pointCount Number of points of each corner
        ///
        ////////////////////////////////////////////////////////////
        explicit RoundedRectangleShape(const Vector2f& size = Vector2f(0, 0), float radius = 0, unsigned int cornerPointCount = 0);

        ////////////////////////////////////////////////////////////
        /// \brief Set the size of the rounded rectangle
        ///
        /// \param size New size of the rounded rectangle
        ///
        /// \see GetSize
        ///
        ////////////////////////////////////////////////////////////
        void setSize(const Vector2f& size);

        ////////////////////////////////////////////////////////////
        /// \brief Get the size of the rounded rectangle
        ///
        /// \return Size of the rounded rectangle
        ///
        /// \see SetSize
        ///
        ////////////////////////////////////////////////////////////
        const Vector2f& getSize() const;

        ////////////////////////////////////////////////////////////
        /// \brief Set the radius of the rounded corners
        ///
        /// \param Radius of the rounded corners
        ///
        /// \see GetRadius
        ///
        ////////////////////////////////////////////////////////////
        void setCornersRadius(float radius);

        ////////////////////////////////////////////////////////////
        /// \brief Get the radius of the rounded corners
        ///
        /// \return Radius of the rounded corners
        ///
        /// \see SetRadius
        ///
        ////////////////////////////////////////////////////////////
        const float getCornersRadius() const;

        ////////////////////////////////////////////////////////////
        /// \brief Set the number of points of each corner
        ///
        /// \param count New number of points of the rounded rectangle
        ///
        /// \see GetPointCount
        ///
        ////////////////////////////////////////////////////////////
        void setCornerPointCount(unsigned int count);

        ////////////////////////////////////////////////////////////
        /// \brief Get the number of points defining the rounded rectangle
        ///
        /// \return Number of points of the rounded rectangle
        ///
        ////////////////////////////////////////////////////////////
        virtual unsigned int getPointCount() const;

        ////////////////////////////////////////////////////////////
        /// \brief Get a point of the rounded rectangle
        ///
        /// The result is undefined if \a index is out of the valid range.
        ///
        /// \param index Index of the point to get, in range [0 .. GetPointCount() - 1]
        ///
        /// \return Index-th point of the shape
        ///
        ////////////////////////////////////////////////////////////
        virtual sf::Vector2f getPoint(unsigned int index) const;

    private:
         ////////////////////////////////////////////////////////////
        // Member data
        ////////////////////////////////////////////////////////////
        Vector2f mySize;
        float myRadius;
        unsigned int myCornerPointCount;
};
}
#endif // ROUNDEDRECTANGLESHAPE_HPP

////////////////////////////////////////////////////////////
/// \class sf::RoundedRectangleShape
/// \ingroup graphics
///
/// This class inherits all the functions of sf::Transformable
/// (position, rotation, scale, bounds, ...) as well as the
/// functions of sf::Shape (outline, color, texture, ...).
///
/// Usage example:
/// \code
/// sf::RoundedRectangleShape roundedRectangle;
/// rectangle.setSize(sf::Vector2f(100, 50));
/// rectangle.setCornersRadius(5);
/// rectangle.setOutlineThickness(5);
/// rectangle.setPosition(10, 20);
/// ...
/// window.draw(rectangle);
/// \endcode
///
/// \see sf::Shape, sf::CircleShape, sf::ConvexShape
///
////////////////////////////////////////////////////////////

Implementation

////////////////////////////////////////////////////////////
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////
// Headers
////////////////////////////////////////////////////////////
#include <SFML/Graphics/RoundedRectangleShape.hpp>
#include <cmath>

namespace sf
{
////////////////////////////////////////////////////////////
RoundedRectangleShape::RoundedRectangleShape(const Vector2f& size, float radius, unsigned int cornerPointCount)
{
    mySize = size;
    myRadius = radius;
    myCornerPointCount = cornerPointCount;
    Update();
}

////////////////////////////////////////////////////////////
void RoundedRectangleShape::setSize(const Vector2f& size)
{
    mySize = size;
    Update();
}

////////////////////////////////////////////////////////////
const Vector2f& RoundedRectangleShape::getSize() const
{
    return mySize;
}

////////////////////////////////////////////////////////////
void RoundedRectangleShape::setCornersRadius(float radius)
{
    myRadius = radius;
    Update();
}

////////////////////////////////////////////////////////////
const float RoundedRectangleShape::getCornersRadius() const
{
    return myRadius;
}

////////////////////////////////////////////////////////////
void RoundedRectangleShape::setCornerPointCount(unsigned int count)
{
    myCornerPointCount = count;
    Update();
}

////////////////////////////////////////////////////////////
unsigned int RoundedRectangleShape::getPointCount() const
{
    return myCornerPointCount*4;
}

////////////////////////////////////////////////////////////
sf::Vector2f RoundedRectangleShape::getPoint(unsigned int index) const
{
    if(index >= myCornerPointCount*4)
        return sf::Vector2f(0,0);

    float deltaAngle = 90.0f/(myCornerPointCount-1);
    sf::Vector2f center;
    unsigned int centerIndex = index/myCornerPointCount;
    unsigned int offset = 0;
    static const float pi = 3.141592654f;

    switch(centerIndex)
    {
        case 0: center.x = mySize.x - myRadius; center.y = myRadius; break;
        case 1: center.x = myRadius; center.y = myRadius; break;
        case 2: center.x = myRadius; center.y = mySize.y - myRadius; break;
        case 3: center.x = mySize.x - myRadius; center.y = mySize.y - myRadius; break;
    }

    return sf::Vector2f(myRadius*cos(deltaAngle*(index-centerIndex)*pi/180)+center.x,
                        myRadius*sin(deltaAngle*(index-centerIndex)*pi/180)-center.y);
}
}//namespace sf