CEnhancedMetaFile.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
   | See: http://www.mrpt.org/Authors - All rights reserved.                |
   | Released under BSD License. See details in http://www.mrpt.org/License |
   +------------------------------------------------------------------------+ */
#pragma once
 
#include <mrpt/img/CCanvas.h>
#include <mrpt/core/safe_pointers.h>
 
namespace mrpt
{
namespace img
{
/** This class represents a Windows Enhanced Meta File (EMF) for generating and
 * saving graphics.
 *  If used under Linux, a ".png", non-vectorial, file will be generated
 * instead.
 * \ingroup mrpt_img_grp
 */
class CEnhancedMetaFile : public CCanvas
{
   private:
        void_ptr_noncopy m_hdc;
        int m_scale;
        void_ptr_noncopy m_hFont{nullptr};
        std::string m_targetFile;
 
   public:
        /** In Linux, the size of the bitmap image that emulates the EMF
         * (Default:800) */
        static void LINUX_IMG_WIDTH(int value);
        static int LINUX_IMG_WIDTH();
        /** In Linux, the size of the bitmap image that emulates the EMF
         * (Default:600) */
        static void LINUX_IMG_HEIGHT(int value);
        static int LINUX_IMG_HEIGHT();
 
        /** Constructor
         *  \param targetFileName This file will be created and the EMF saved
         * there.
         *  \param scaleFactor All coordinates in draw commands will be internally
         * multiplied by this scale, to provide a way of obtaining "subpixel"
         * drawing.
         */
        CEnhancedMetaFile(const std::string& targetFileName, int scaleFactor = 1);
 
        /** Destructor */
        virtual ~CEnhancedMetaFile();
 
        /** Changes the value of the pixel (x,y).
         *  Pixel coordinates starts at the left-top corner of the image, and start
         * in (0,0).
         *  The meaning of the parameter "color" depends on the implementation: it
         * will usually
         *   be a 24bit RGB value (0x00RRGGBB), but it can also be just a 8bit gray
         * level.
         *  This method must support (x,y) values OUT of the actual image size
         * without neither
         *   raising exceptions, nor leading to memory access errors.
         */
        void setPixel(int x, int y, size_t color) override;
 
        /** Returns the width of the image in pixels (this currently has no
         * applicability for a EMF file...) */
        size_t getWidth() const override { return 640; }
        /** Returns the height of the image in pixels (this currently has no
         * applicability for a EMF file...) */
        size_t getHeight() const override { return 480; }
        /** Draws an image as a bitmap at a given position.
         * \param x0 The top-left corner x coordinates on this canvas where the
         * image is to be drawn
         * \param y0 The top-left corner y coordinates on this canvas where the
         * image is to be drawn
         * \param img The image to be drawn in this canvas
         *  This method may be redefined in some classes implementing this
         * interface in a more appropiate manner.
         */
        void drawImage(int x, int y, const mrpt::img::CImage& img) override;
 
        /** Draws a line.
         * \param x0 The starting point x coordinate
         * \param y0 The starting point y coordinate
         * \param x1 The end point x coordinate
         * \param y1 The end point y coordinate
         * \param color The color of the line
         * \param width The desired width of the line (this is IGNORED in this
         * virtual class)
         *  This method may be redefined in some classes implementing this
         * interface in a more appropiate manner.
         */
        void line(
                int x0, int y0, int x1, int y1, const mrpt::img::TColor color,
                unsigned int width = 1, TPenStyle penStyle = psSolid) override;
 
        /** Places a text label.
         * \param x0 The x coordinates
         * \param y0 The y coordinates
         * \param str The string to put
         * \param color The text color
         * \param fontSize The font size, in "points"
         *  This method may be redefined in some classes implementing this
         * interface in a more appropiate manner.
         * \sa rectangle
         */
        void textOut(
                int x0, int y0, const std::string& str,
                const mrpt::img::TColor color) override;
 
        /** Select the current font used when drawing text.
         * \param fontName The face name of a font (e.g. "Arial","System",...)
         * \param fontSize The size of the font in pts.
         * \param bold Whether the font is bold
         * \param italic Whether the font is italic
         * \sa textOut, CCanvas::selectTextFont
         */
        virtual void selectVectorTextFont(
                const std::string& fontName, int fontSize, bool bold = false,
                bool italic = false);
 
        /** Draws an image as a bitmap at a given position, with some custom scale
         * and rotation changes.
         * \param x0 The top-left corner x coordinates on this canvas where the
         * image is to be drawn
         * \param y0 The top-left corner y coordinates on this canvas where the
         * image is to be drawn
         * \param rotation The rotation in radians, positive values being
         * anti-clockwise direction, 0 is the normal position.
         * \param scale The scale factor, e.g. 2 means twice the original size.
         * \param img The image to be drawn in this canvas
         *  This method may be redefined in some classes implementing this
         * interface in a more appropiate manner.
         */
        void drawImage(
                int x, int y, const mrpt::img::CImage& img, float rotation,
                float scale) override
        {
                CCanvas::drawImage(x, y, img, rotation, scale);
        }
 
        /** Draws a rectangle (an empty rectangle, without filling)
         * \param x0 The top-left x coordinate
         * \param y0 The top-left y coordinate
         * \param x1 The right-bottom x coordinate
         * \param y1 The right-bottom y coordinate
         * \param color The color of the line
         * \param width The desired width of the line.
         * \sa filledRectangle
         */
        virtual void rectangle(
                int x0, int y0, int x1, int y1, const mrpt::img::TColor color,
                unsigned int width = 1);
 
        /** Draws an ellipse representing a given confidence interval of a 2D
         * Gaussian distribution.
         * \param mean_x The x coordinate of the center point of the ellipse.
         * \param mean_y The y coordinate of the center point of the ellipse.
         * \param cov2D A 2x2 covariance matrix.
         * \param confIntervalStds How many "sigmas" for the confidence level (i.e.
         * 2->95%, 3=99.97%,...)
         * \param color The color of the ellipse
         * \param width The desired width of the line (this is IGNORED in this
         * virtual class)
         * \param nEllipsePoints The number of points to generate to approximate
         * the ellipse shape.
         * \exception std::exception On an invalid matrix.
         */
        template <class T>
        void ellipseGaussian(
                math::CMatrixTemplateNumeric<T>* cov2D, T mean_x, T mean_y,
                float confIntervalStds = 2,
                const mrpt::img::TColor& color = mrpt::img::TColor(255, 255, 255),
                unsigned int width = 1, int nEllipsePoints = 20)
        {
                MRPT_START
                int x1 = 0, y1 = 0, x2 = 0, y2 = 0;
                double ang;
                math::CMatrixTemplateNumeric<T> eigVal, eigVec;
                int i;
 
                // Compute the eigen-vectors & values:
                cov2D->eigenVectors(eigVec, eigVal);
 
                eigVal.Sqrt();
                math::CMatrixTemplateNumeric<T> M(eigVal * (~eigVec));
 
                // Compute the points of the 2D ellipse:
                for (i = 0, ang = 0; i < nEllipsePoints;
                         i++, ang += (M_2PI / (nEllipsePoints - 1)))
                {
                        float ccos = cos(ang);
                        float ssin = sin(ang);
 
                        x2 = round(
                                mean_x + confIntervalStds * (ccos * M(0, 0) + ssin * M(1, 0)));
                        y2 = round(
                                mean_y + confIntervalStds * (ccos * M(0, 1) + ssin * M(1, 1)));
 
                        if (i > 0) line(x1, y1, x2, y2, color, width);
 
                        x1 = x2;
                        y1 = y2;
                }  // end for points on ellipse
 
                MRPT_END_WITH_CLEAN_UP(
                        std::cout << "Covariance matrix leading to error is:" << std::endl
                                          << *cov2D << std::endl;);
        }
};  // End of class def.
}  // namespace img
}  // namespace mrpt