Canvas.h

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/* Copyright 2017 Kristofer Björnson
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef COM_DAFER45_TBTK_CANVAS
#define COM_DAFER45_TBTK_CANVAS

#include "Streams.h"
#include "TBTKMacros.h"

#include <initializer_list>

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

namespace TBTK{

template<typename CoordinateType>
class Canvas{
public:
    class RGBA{
    public:
        RGBA(char r, char g, char b, char a = 0);
    private:
        char r, g, b, a;

        friend class Canvas;
    };

    class Pixel{
    public:
        Pixel(unsigned int x, unsigned int y);

        unsigned int x, y;
    };

    Canvas(unsigned int width, unsigned int height);

    ~Canvas();

    void setOrigin(CoordinateType x, CoordinateType y);

    void setBasisVectors(
        std::initializer_list<std::initializer_list<CoordinateType>> basisVectors
    );

    void drawPixel(const RGBA &rgba, CoordinateType x, CoordinateType y);

    void drawCircle(const RGBA &rgba, CoordinateType x, CoordinateType y, CoordinateType radius);

    void save(std::string filename) const;
private:
    cv::Mat data;

    CoordinateType origin[2];

    CoordinateType basisVectors[2][2];

    double norms[2];

    Pixel getPixel(CoordinateType x, CoordinateType y);

    void calculateNorms();
};

template<typename CoordinateType>
Canvas<CoordinateType>::~Canvas(){
}

template<typename CoordinateType>
void Canvas<CoordinateType>::setOrigin(CoordinateType x, CoordinateType y){
    origin[0] = x;
    origin[1] = y;
}

template<>
inline void Canvas<unsigned int>::drawPixel(
    const RGBA &rgba,
    unsigned int x,
    unsigned int y
){
    if(x < (unsigned int)data.cols && y < (unsigned int)data.rows){
        data.at<cv::Vec3b>(y, x)[0] = rgba.b;
        data.at<cv::Vec3b>(y, x)[1] = rgba.g;
        data.at<cv::Vec3b>(y, x)[2] = rgba.r;
    }
}

template<>
inline void Canvas<double>::drawPixel(
    const RGBA &rgba,
    double x,
    double y
){
    Pixel p = getPixel(x, y);
    if(p.x >= 0
        && p.x < (unsigned int)data.cols
        && p.y >= 0
        && p.y < (unsigned int)data.rows
    ){
        data.at<cv::Vec3b>(p.y, p.x)[0] = rgba.b;
        data.at<cv::Vec3b>(p.y, p.x)[1] = rgba.g;
        data.at<cv::Vec3b>(p.y, p.x)[2] = rgba.r;
    }
}

template<>
inline void Canvas<unsigned int>::drawCircle(
    const RGBA &rgba,
    unsigned int x,
    unsigned int y,
    unsigned int radius
){
//  if(x < (unsigned int)data.cols && y < (unsigned int)data.rows){
        cv::circle(data, cv::Point(x, y), radius, cv::Scalar(rgba.r, rgba.g, rgba.b), CV_FILLED, 8, 0);
//  }
}

template<>
inline void Canvas<double>::drawCircle(
    const RGBA &rgba,
    double x,
    double y,
    double radius
){
    Pixel p = getPixel(x, y);
/*  if(p.x >= 0
        && p.x < (unsigned int)data.cols
        && p.y >= 0
        && p.y < (unsigned int)data.rows
    ){*/
        cv::circle(data, cv::Point(p.x, p.y), (int)radius, cv::Scalar(rgba.r, rgba.g, rgba.b));
//  }
}

template<typename CoordinateType>
inline typename Canvas<CoordinateType>::Pixel Canvas<CoordinateType>::getPixel(
    CoordinateType x,
    CoordinateType y
){
    double projections[2];
    for(unsigned int n = 0; n < 2; n++){
        projections[n]
            = ((double)x - (double)origin[0])*((double)basisVectors[n][0])
            + ((double)y - (double)origin[1])*((double)basisVectors[n][1]);
        projections[n] /= norms[n]*norms[n];
    }

    return Pixel(data.cols*projections[0], data.rows*projections[1]);
}

template<typename CoordinateType>
inline void Canvas<CoordinateType>::setBasisVectors(
    std::initializer_list<std::initializer_list<CoordinateType>> basisVectors
){
    TBTKAssert(
        basisVectors.size() == 2,
        "Canvas::setBasisVectors()",
        "'basisVectors' must contain two vectors.",
        ""
    );
    for(unsigned int n = 0; n < 2; n++){
        TBTKAssert(
            (basisVectors.begin() + n)->size() == 2,
            "Canvas::setBasisVectors",
            "Each basis vector must have two components, but basis"
            << " vector " << n << " has "
            << (basisVectors.begin() + n)->size()
            << " components.",
            ""
        );
    }

    for(unsigned int n = 0; n < 2; n++)
        for(unsigned int c = 0; c < 2; c++)
            this->basisVectors[n][c] = *((basisVectors.begin() + n)->begin() + c);

    calculateNorms();
}

template<typename CoordinateType>
inline void Canvas<CoordinateType>::save(std::string filename) const{
    imwrite(filename, data);
}

template<typename CoordinateType>
inline Canvas<CoordinateType>::RGBA::RGBA(char r, char g, char b, char a){
    this->r = r;
    this->g = g;
    this->b = b;
    this->a = a;
}

template<typename CoordinateType>
inline Canvas<CoordinateType>::Pixel::Pixel(unsigned int x, unsigned int y){
    this->x = x;
    this->y = y;
}

template<typename CoordinateType>
inline void Canvas<CoordinateType>::calculateNorms(){
    for(unsigned int n = 0; n < 2; n++){
        norms[n] = 0;
        for(unsigned int c = 0; c < 2; c++)
            norms[n] += basisVectors[n][c]*basisVectors[n][c];
        norms[n] = sqrt(norms[n]);
    }
}

};  //End namespace TBTK

#endif