#include "svt.h"
    //Draw.h by RorschachUK
    //A simple line-drawing and 2D vector graphics library

    //Convert RGB values (and transparency flag) into a Color struct
    Color RGBColor(unsigned char R, unsigned char G, unsigned char B, unsigned char T);

    //Some standard colours
    #define WHITE RGBColor(255,255,255,0)
    #define BLACK RGBColor(0,0,0,0)
    #define RED RGBColor(255,0,0,0)
    #define GREEN RGBColor(0,255,0,0)
    #define BLUE RGBColor(0,0,255,0)
    #define CYAN RGBColor(0,255,255,0)
    #define YELLOW RGBColor(255,255,0,0)
    #define MAGENTA RGBColor(255,0,255,0)
    #define GREY RGBColor(128,128,128,0)
    #define DARK_RED RGBColor(128,0,0,0)
    #define DARK_GREEN RGBColor(0,128,0,0)
    #define DARK_BLUE RGBColor(0,0,128,0)

    //General line drawing routines

    //Plot a point on the screen in a given colour
    void Plot(int x, int y, Color c);

    //Draw a line connecting two points, in a given colour
    void DrawLine(int x0, int y0, int x1, int y1, Color c);

    //Draw a circle with a given centre, radius and colour
    void DrawCircle(int xCenter, int yCenter, int radius, Color c);


    //2D Vector stuff

    //For polygons we'll use an array of points
    typedef struct {
       int x;
       int y;
    } iPoint;

    //Draw a polygon with a given set of points, in a given colour
    void DrawPoly(int numPoints, iPoint points[], Color c);

    //Rotate a point a given angle around an origin
    void RotatePoint(iPoint *point, int origX, int origY, float radAngle);

    //Rotate an entire polygon about an origin point
    void RotatePoly(int numPoints, iPoint polygon[], int origX, int origY, float radAngle);

    //Shift a polygon in 2D space
    void MovePoly(int numPoints, iPoint polygon[], int shiftX, int shiftY);

    //Rescale a point with respect to an origin and scale factor
    void ScalePoint(iPoint *point, int origX, int origY, float scaleFactor);

    //Rescale the dimensions of a polygon
    void ScalePoly(int numPoints, iPoint polygon[], int origX, int origY, float scaleFactor);

    //Math approximations - quick & dirty for faster graphics but NOT accurate

    #define PI 3.14159265

    //Quick square root
    float qsqrt(float number);

    //Quick sine
    float qsin(float number);

    //Quick cosine
    float qcos(float number);