// Change the vector in 'src' into a unit vector at 'dst' - ie with length = 1
// src and dst can be the same vector
void vector2d_Normalise(VECTOR2D* dst,const VECTOR2D* src){
vector2d_Copy(dst,src);
if(!dst->normalised){
double dist = vector2d_Length(dst);
dst->x /= dist;
dst->y /= dist;
dst->normalised = TRUE;
}
}
static void draw(GDISPLAY_WIDGET* widget){
GDISPLAY* display = widget->_owner_;
DIAL_WIDGET* dial = (DIAL_WIDGET*)widget;
// Get the center of the dial
PIXEL radius = getRadius(dial);
//PIXEL innerRadius = radius * (100 - dial->dialThickness) / 100;
VECTOR2D north = MAKE_VECTOR2D(0,-1);
VECTOR2D origin = MAKE_VECTOR2D(centerX(dial),centerY(dial));
MATRIX2D rotate;
// Create the dial background circle
_displayMoveTo(display, origin.x, origin.y);
_displaySetInk(display,&dial->_props_.dial);
_displayCircle(display, radius, TRUE);
// _displaySetInk(display,&dial->_widget_.bgnd);
// _displayCircle(display, innerRadius, TRUE);
// Put grad marks for every x
if(dial->_props_.gradVal != 0){
_displaySetInk(display, &dial->_props_.grad);
for(double grad = dial->_props_.setting.min; grad <= dial->_props_.setting.max; grad+=dial->_props_.gradVal){
// Create Rotation matrix
double angle = interpolatef(grad, dial->_props_.setting.min, dial->_props_.setting.max, dial->_props_.minAng, dial->_props_.maxAng);
double rad = angle * M_PI/180.0;
matrix2d_SetRotate(&rotate, rad);
// Rotate the North vector
VECTOR2D max,min;
matrix2d_Transform(&max, &north, &rotate);
vector2d_Copy(&min,&max);
vector2d_Scale(&max,radius);
double scale = 0.85;
vector2d_Scale(&min,radius * scale);
vector2d_Add(&min,&origin);
vector2d_Add(&max,&origin);
// Draw line from min to max
_displayMoveTo(display, round(min.x), round(min.y));
_displayLineTo(display, round(max.x), round(max.y));
}
}
}