Camera2D.h

//
// Created by flo on 10/28/2021.
//

#ifndef NOMPROJET_CAMERA2D_H
#define NOMPROJET_CAMERA2D_H

class Camera2D{
private:
    float x=0.0F,y=0.0F;
    float targetX=0.0F,targetY=0.0F;
    const float defaultZoom = 1.0F,maxZoom=0.90F;
    float zoom = defaultZoom;

    // from 0 to 1 plz
    float cameraSmoothnessX = 0.15F;
    float cameraSmoothnessY = 0.15F;
    float zoomSmoothNess = 0.10F;

public:
    int W,H;

    Camera2D(int W,int H){this->W = W;this->H = H;}
    Camera2D(float x,float y){setX(0.0F);setY(0.0F);}

    float getX(){return x;}
    float getY(){return y;}

    void setX(float newX){x=newX;}
    void setY(float newY){y=newY;}

    void move(float offsetX,float offsetY){
        setX(x+offsetX);
        setY(y+offsetY);
    }

    void center(int x,int y,int pixelPerUnit){
        setX( (x * pixelPerUnit)- W/2);
        setY( (y * pixelPerUnit) - H/2);
    }

    void target(float x,float y,int pixelPerUnit){
        targetX = ((x*pixelPerUnit) - W/2);
        targetY = ((y*pixelPerUnit)  - H/2);
    }

    /**
     *
     * Smooth Lerp Follow Target camera.
    */
    void slerpFollow(){
        // update position by 15% of the distance between position and target position
        move((targetX- x)*cameraSmoothnessX,(targetY - y)*cameraSmoothnessY);
    }

    void zoomActived(bool active,float deltaTime){
        if(active) zoom += (maxZoom-zoom)*zoomSmoothNess*deltaTime;
        else zoom += (defaultZoom-zoom)*zoomSmoothNess*deltaTime;
    }

    float getZoom(){
        return zoom;
    }
};


#endif //NOMPROJET_CAMERA2D_H