// relative value
func (p *Parameters) MoveRelativeLocation(x, y float64) {
normRelativeValue := func(x float64) float64 {
if x < -1 {
x = -1
}
if x > 1 {
x = 1
}
return x
}
x = normRelativeValue(x)
y = normRelativeValue(y)
loc := &(p.FractalInfo.Location)
var m mth2d.Matrix
m.InitIdendity()
m.Scale(loc.Radius, loc.Radius)
m.Rotate(degToRad(loc.Angle))
m.Translate(loc.Center.Re, loc.Center.Im)
loc.Center.Re, loc.Center.Im = m.TransformPoint(x, y)
}
func RenderImageRGBA(m *image.RGBA, params Parameters) {
var (
nX = m.Rect.Dx()
nY = m.Rect.Dy()
fi = params.FractalInfo
pixelWidth = 2 * fi.Location.Radius / float64(min(nX, nY))
center = fi.Location.Center
)
var transform mth2d.Matrix
transform.InitIdendity()
transform.Translate(-float64(nX)/2, -float64(nY)/2)
transform.Scale(pixelWidth, pixelWidth)
mth2d.ReflectAxisX(&transform)
transform.Rotate(degToRad(fi.Location.Angle))
transform.Translate(center.Re, center.Im)
numCPU := runtime.NumCPU()
countY, countX := nearDivs(numCPU)
var (
xIns = interval.Interval{Max: nX}.Split(countX)
yIns = interval.Interval{Max: nY}.Split(countY)
)
si := newSyncImage(m)
c := newColorСomputer(params, transform)
wg := new(sync.WaitGroup)
for _, yIn := range yIns {
for _, xIn := range xIns {
var (
r = image.Rectangle{
Min: image.Point{xIn.Min, yIn.Min},
Max: image.Point{xIn.Max, yIn.Max},
}
cc = c.Clone()
)
wg.Add(1)
go renderRectangle(wg, r, cc, si)
}
}
wg.Wait()
}