void
PolygonRotateShift(RasterPoint *poly, const int n,
const PixelScalar xs, const PixelScalar ys,
Angle angle, const int scale)
{
static Angle lastangle = Angle::Native(fixed(-1));
static int cost = 1024, sint = 0;
static int last_scale = 0;
angle = angle.AsBearing();
if ((angle != lastangle) || (last_scale != scale)) {
lastangle = angle;
last_scale = scale;
if (scale == 100) {
cost = FastScale(angle.ifastcosine());
sint = FastScale(angle.ifastsine());
} else {
cost = FastScale(angle.ifastcosine() * scale) / 100;
sint = FastScale(angle.ifastsine() * scale) / 100;
}
}
RasterPoint *p = poly;
const RasterPoint *pe = poly + n;
while (p < pe) {
int x = p->x;
int y = p->y;
p->x = roundshift(x * cost - y * sint) + xs;
p->y = roundshift(y * cost + x * sint) + ys;
p++;
}
}
/**
* Shifts and rotates the given polygon and also sizes it via FastScale()
* @param poly Points specifying the polygon
* @param n Number of points of the polygon
* @param xs Pixels to shift in the x-direction
* @param ys Pixels to shift in the y-direction
* @param angle Angle of rotation
*/
void
PolygonRotateShift(RasterPoint *poly, const int n, const int xs, const int ys,
Angle angle, const bool scale)
{
static Angle lastangle = Angle::native(-fixed_one);
static int cost = 1024, sint = 0;
static bool last_scale = false;
angle = angle.as_bearing();
if ((angle != lastangle) || (last_scale != scale)) {
lastangle = angle;
last_scale = scale;
if (scale) {
cost = Layout::FastScale(angle.ifastcosine());
sint = Layout::FastScale(angle.ifastsine());
} else {
cost = Layout::FastScale(angle.ifastcosine()/2);
sint = Layout::FastScale(angle.ifastsine()/2);
}
}
RasterPoint *p = poly;
const RasterPoint *pe = poly + n;
while (p < pe) {
int x = p->x;
int y = p->y;
p->x = roundshift(x * cost - y * sint ) + xs;
p->y = roundshift(y * cost + x * sint ) + ys;
p++;
}
}
