I have a requirement for drawing the limit line which is near to the top of the chart and I want to keep limit line label on top right. Is there any way, it can not be truncated. Please see my output.
enter image description here
try limitline.labelPosition = ChartLimitLabelPositionRightBottom;
if you want keep labelPosition on top right,
you may can try set yourYAxis.spaceTop = x;
if x == 0, the maxValue will match the top of the chart,
if x == 1, the maxValue will match the centerY of the chart,
sorry, I can't express myself well, but, just try it.
hope it works.
The default renderer is little bit messed up. Subclass it (YAxisRenderer) and override method: renderLimitLines. Copy the content from original renderer and replace lines:
var clippingRect = viewPortHandler.contentRect
clippingRect.origin.y -= l.lineWidth / 2.0
clippingRect.size.height += l.lineWidth
with:
var clippingRect = viewPortHandler.contentRect
clippingRect.origin.y -= l.lineWidth / 2.0 + l.valueFont.lineHeight
clippingRect.size.height += l.lineWidth + l.valueFont.lineHeight
Now, as you have it prepared, you need to set your new axis renderer for
let yAxisRenderer = CenteredLimitLineYAxisRenderer(
viewPortHandler: chart.viewPortHandler,
yAxis: chart.leftAxis,
transformer: chart.getTransformer(forAxis: .left)
)
chart.leftYAxisRenderer = yAxisRenderer
Related
Im using the code below to draw a line:
//#version=4
simplesma = sma(close, 14)
var line3 = line.new(bar_index[0], high[0], bar_index, low, extend = extend.right)
line.set_xy1(line3, bar_index[5], simplesma[5])
line.set_xy2(line3, bar_index[3], simplesma[3])
That line has been drawn using 2 points in the history.
And then I use this code to draw a plot
price_point = line.get_price(line3,bar_index)
plot(price_point, title='Price', color=#ffcc00, transp=30)
Im trying to display the value on a label but the following code does not work:
var label3 = label.new(bar_index, high, text = "Value: "+ tostring(price_point, "#.########"), style = label.style_label_lower_left, color=#ffcc00, textcolor=#ff0000)
label.set_xy(label3,bar_index, price_point)
Can you please help me to show it on label ?
The variable price_point is the value at the current bar (bar_index). You don't need to use the function tostring().
Oh I found it.
var label3 = label.new(bar_index, high, text = "", style = label.style_label_lower_left, color=#ffcc00, textcolor=#ff0000)
label.set_xy(label3,bar_index, price_point)
label.set_text(label3, "Value: "+ tostring(price_point, "#.########"))
In the SceneKit WWDC 2014, they have an example of a vortex field with this effect:
The particle system looks much like a tornato, as it spins inward with a hollow center.
However, the documentation for vortex fields have no information on how to achieve this effect. Right now, I have this:
// create the particle system
let exp = SCNParticleSystem()
exp.loops = true
exp.particleMass = 5
exp.birthRate = 10000
exp.emissionDuration = 10
exp.emitterShape = SCNTorus(ringRadius: 5, pipeRadius: 1)
exp.particleLifeSpan = 15
exp.particleVelocity = 2
exp.particleColor = UIColor.white
exp.isAffectedByPhysicsFields = true
scene.addParticleSystem(exp, transform: SCNMatrix4MakeRotation(0, 0, 0, 0))
// create the field
let field = SCNPhysicsField.vortex()
field.strength = -5
field.direction = SCNVector3(x: 0, y: 1, z: 0)
let fieldNode = SCNNode()
fieldNode.physicsField = field
scene.rootNode.addChildNode(fieldNode)
This creates this effect:
Where I am looking down at the particles rotating clockwise with a really big radius outwards. It looks nothing like a tornato effect. How can I create this effect?
You say tornato, I say tornado, let’s call the whole thing off...
The SceneKit WWDC 2014 demo/slides is a sample code project, so you can see for yourself how they made any of the effects you see therein. In this case, it looks like the “vortex” demo isn’t actually using the vortexField API, but instead the custom field API that lets you supply your own math in an evaluator block. (See the link for the code in that block.)
You might be able to get similar behavior without a custom field by combining a vortex (causes rotation only) with radial gravity (attracts inward) with linear gravity (attracts downward), or some other combination (possibly something involving electric charge). But you’d probably have to experiment with tweaking the parameters quite a bit.
If anyone is still interested in this topic - here is a Swift 5 implementation of that legendary tornado effect.
Here is an example function that will create your tornado.
func addTornadoPhysicsField() {
// Tornado Particles Field Example
guard let tornadoSystem = SCNParticleSystem(named: "tornado.scnp", inDirectory: nil) else { return }
let emitterGeometry = SCNTorus(ringRadius: 1.0, pipeRadius: 0.2)
emitterGeometry.firstMaterial?.transparency = 0.0
let fieldAndParticleNode = SCNNode(geometry: emitterGeometry)
fieldAndParticleNode.position = SCNVector3(0.0, 0.0, -20.0)
tornadoSystem.emitterShape = emitterGeometry
fieldAndParticleNode.addParticleSystem(tornadoSystem)
yourScene.rootNode.addChildNode(fieldAndParticleNode)
// Tornado
let worldOrigin = SCNVector3Make(fieldAndParticleNode.worldTransform.m41,
fieldAndParticleNode.worldTransform.m42,
fieldAndParticleNode.worldTransform.m43)
let worldAxis = simd_float3(0.0, 1.0, 0.0) // i.Ex. the Y axis
// Custom Field (Tornado)
let customVortexField = SCNPhysicsField.customField(evaluationBlock: { position, velocity, mass, charge, time in
let l = simd_float3(worldOrigin.x - position.x, 1.0, worldOrigin.z - position.z)
let t = simd_cross(worldAxis, l)
let d2: Float = l.x * l.x + l.z * l.z
let vs: Float = 27 / sqrt(d2) // diameter, the bigger the value the wider it becomes (Apple Default = 20)
let fy: Float = 1.0 - Float((min(1.0, (position.y / 240.0)))) // rotations, a higher value means more turn arounds (more screwed, Apple Default = 15.0))
return SCNVector3Make(t.x * vs + l.x * 10 * fy, 0, t.z * vs + l.z * 10 * fy)
})
customVortexField.halfExtent = SCNVector3Make(100, 100, 100)
fieldAndParticleNode.physicsField = customVortexField // Attach the Field
}
Additional Configuration Options:
Finally all this can result in something like that:
Note: if you would like to move your static tornado almost like a real tornado, you will have to find a way to re-apply the physics field for each rendererd frame. If you don't, the world origin used in the evaluation block will not move and it will distort your tornado.
Note: You can also split the particle/field node into two different nodes that moves independently from each other. Constrain the field node to the position of the particle node and play around with the influence factor (still need to re-apply the field each frame)
For more information on Custom Fields check out here.
I have three monitors in a horizontal line. Sometimes i want to maximize a window to three monitors at once, by pressing a combination of keys (and then returning it all back if necessary). How can I do that?
Untested, but the basic idea is to make the window floating and resize it to cover everything:
function(c)
c.floating = true
local geo = screen[1].geometry
geo.x2 = geo.x + geo.width
geo.y2 = geo.y + geo.height
for s in screen do
local geo2 = s.geometry
geo.x = math.min(geo.x, geo2.x)
geo.y = math.min(geo.y, geo2.y)
geo.x2 = math.max(geo.x2, geo2.x + geo2.width)
geo.y2 = math.max(geo.y2, geo2.y + geo2.height)
end
c:geometry{
x = geo.x,
y = geo.y,
width = geo.x2 - geo.x,
height = geo.y2 - geo.y
}
end
To undo the above, make the client no longer floating, i.e. c.floating = false.
Wiring the above to a keybinding is left as an exercise for the reader.
I want to create an eyeball that follows the user. In this sense, the eye should follow the position of the user but should only be able to move within certain bounds (The eye socket). The code I wrote below works, but its very choppy.
if(dist <= socketRadius - self.aEye.size.width/2.2){
lastPosition = self.aEye.position
self.aEye.physicsBody?.velocity = CGVector(dx:theVec.dx * eyeMoveSpeed, dy:theVec.dy * eyeMoveSpeed)
}
else{
let toCenterVector = normalizeVector( CGVector(dx:(self.socket.position.x - self.aEye.position.x), dy:(self.socket.position.y - self.aEye.position.y)*3 ))
self.aEye.physicsBody?.velocity = toCenterVector
print(toCenterVector)
print("Out")
}
(dist is the distance from the eyeball to the eyesocket center)
Is there a way to have a smooth flow of the eyeball around its socket to follow the user's position?
You can use SKConstraints to achieve this. Something like:
let rangeToCenterSprite = SKRange(lowerLimit: 80, upperLimit: 90)
var distanceConstraint: SKConstraint
distanceConstraint = SKConstraint.distance(rangeToCenterSprite, toNode: SpriteNodeInEyeCenter)
EyeBallSprite.constraints = [distanceConstraint]
I'm not able to draw, i've already read tutorials, i can't find the problem.
I simply have a correct UI drawed by Glade. Then i want to draw, for example 50 drawing areas. So i create a Grid with 50 cells; for each cell there is a vertical box (with a drawing area and a label inside each one). But i can't seen anything drawed.
class collega_GUI:
def __init__(self):
try:
self.__builder = Gtk.Builder()
self.__builder.add_from_file('UI2.glade')
self.__Grid = Gtk.Grid()
self.__Grid.set_margin_left(20)
self.__Grid.set_margin_right(20)
self.__Grid.set_row_spacing(10)
self.__Grid.set_column_spacing(15)
self.__Grid.set_column_homogeneous(True)
self.__GridBox = self.__builder.get_object('box11')
self.__GridBox.pack_end(self.__Grid, 1, 1, 20)
indirizzi_ip = []
for i in range(50):
indirizzi_ip.append(str(i))
cpu_info = {}
for ip in indirizzi_ip:
cpu_info[ip] = dict()
left = 0
right = 0
for ip in indirizzi_ip:
cpu_info[ip]['drawing_area'] = Gtk.DrawingArea()
cpu_info[ip]['drawing_area'].set_size_request(100, 100)
cpu_info[ip]['drawing_area'].set_name(ip)
box = Gtk.VBox(False, 5)
box.add(cpu_info[ip]['drawing_area'])
label = Gtk.Label(ip)
box.add(label)
self.__Grid.attach(box, left, right, 1, 1) #object,left,right,top,bottom
cpu_info[ip]['drawing_area'].connect("draw", self.__draw)
label.show()
cpu_info[ip]['drawing_area'].show() #the draw should start now!
box.show()
# 5 drawing areas in a row
left += 1
if left == 5:
right += 1
left = 0
self.__builder.get_object('Azioni_Window').show()
Gtk.main()
except Exception as xe:
logging.error('%s' % str(xe))
sys.exit()
def __draw(self, widget, context):
context.set_source_rgb(0.9, 0, 0.1) #rosso
context.set_source_rgb(0.1, 0.9, 0) #verde
context.set_source_rgb(0.8, 0.7, 0) #giallo
context.set_source_rgb(0.8, 0.7, 0.8) #inattivo
context.rectangle(0, 0, widget.get_allocated_width(), widget.get_allocated_height())
context.fill()
if __name__=='__main__':
try:
UINX=collega_GUI()
except Exception:
sys.exit()
You're missing
self.__Grid.show()
And hence nothing in the grid is shown.
In general it's easier to just call show_all() on some top-level container rather than trying to remember to show() every individual widget.