print label on 3d scnnode cylinder in a horizontal and vertical way
in my code right now you can add a cylinder. What I would like to do is display a label that says height and the corresponding slider value. If the cylinder is too wide I would eventually like to to be displayed horizontally but when it gets too tall or the aspect ratio is even display it vertically like I have with the corresponding gif. The current code does not print a label on it. Please print a label on it similar to the one shown in the gif.
Current Code
Desired Output
import UIKit
import SceneKit;import CoreData
class one: UIViewController {
var cylinderButton = UIButton()
var onOfSwitch = UISwitch()
var scnView = SCNView()
var cameraNode = SCNNode()
var selectedNode: SCNNode?
var sL = UISlider(), sW = UISlider(), sH = UISlider()
var sLLabel = UILabel(), sWLabel = UILabel(), sHLabel = UILabel()
var pinchGesture: UIPinchGestureRecognizer?
var DragLabel = UILabel()
override func viewDidLoad() {
super.viewDidLoad()
[ onOfSwitch, scnView,cylinderButton,sL,sW,sH,sLLabel,sWLabel,sHLabel,DragLabel].forEach {
view.addSubview($0)
$0.translatesAutoresizingMaskIntoConstraints = false
$0.layer.borderWidth = 1
$0.backgroundColor = UIColor(
red: .random(in: 0.5...0.7),
green: .random(in: 0.0...1),
blue: .random(in: 0.3...0.5),
alpha: 1
)
if let button = $0 as? UIButton {
button.setTitleColor(.black, for: .normal)
}
}
[sL, sW, sH].forEach {
$0.minimumValue = 0.2
$0.maximumValue = 2.0
$0.value = 1.0
$0.addTarget(self, action: #selector(updateBoxSize), for: .valueChanged)
}
NSLayoutConstraint.activate([
scnView.topAnchor.constraint(equalTo: view.topAnchor),
scnView.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.55),
scnView.widthAnchor.constraint(equalTo: view.widthAnchor),
scnView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
sL.topAnchor.constraint(equalTo: scnView.bottomAnchor),
sL.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
sL.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 2/3),
sL.leadingAnchor.constraint(equalTo: view.leadingAnchor),
sLLabel.topAnchor.constraint(equalTo: scnView.bottomAnchor),
sLLabel.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
sLLabel.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 1/5),
sLLabel.leadingAnchor.constraint(equalTo: sL.trailingAnchor),
sW.topAnchor.constraint(equalTo: sL.bottomAnchor),
sW.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
sW.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 2/3),
sW.leadingAnchor.constraint(equalTo: view.leadingAnchor),
sWLabel.topAnchor.constraint(equalTo: sL.bottomAnchor),
sWLabel.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
sWLabel.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 1/5),
sWLabel.leadingAnchor.constraint(equalTo: sW.trailingAnchor),
sH.topAnchor.constraint(equalTo: sW.bottomAnchor),
sH.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
sH.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 2/3),
sH.leadingAnchor.constraint(equalTo: view.leadingAnchor),
sHLabel.topAnchor.constraint(equalTo: sW.bottomAnchor),
sHLabel.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.04),
sHLabel.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 1/5),
sHLabel.leadingAnchor.constraint(equalTo: sH.trailingAnchor),
cylinderButton.topAnchor.constraint(equalTo: sH.bottomAnchor),
cylinderButton.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.10),
cylinderButton.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 1/3),
cylinderButton.leadingAnchor.constraint(equalTo: view.leadingAnchor),
DragLabel.topAnchor.constraint(equalTo: sH.bottomAnchor),
DragLabel.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.05),
DragLabel.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 1/3),
DragLabel.leadingAnchor.constraint(equalTo: cylinderButton.trailingAnchor),
onOfSwitch.topAnchor.constraint(equalTo: DragLabel.bottomAnchor),
onOfSwitch.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.05),
onOfSwitch.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 1/3),
onOfSwitch.leadingAnchor.constraint(equalTo: cylinderButton.trailingAnchor),
])
DragLabel.text = "Drag to Rotate"
let scene = SCNScene()
scnView.scene = scene
scnView.backgroundColor = .gray
DragLabel.textAlignment = .center
setupCamera()
setupLight()
cylinderButton.setTitle("Circle", for: .normal)
cylinderButton.addTarget(self, action: #selector(addCylinder), for: .touchUpInside)
onOfSwitch.addTarget(self, action: #selector(toggleCameraControl), for: .valueChanged)
onOfSwitch.isOn = true
scnView.allowsCameraControl = true
sWLabel.text = "Width"
sHLabel.text = "Height"
sHLabel.textAlignment = .center
sWLabel.textAlignment = .center
sLLabel.textAlignment = .center
sL.value = 0.5
sH.value = 0.5
sW.value = 0.5
sL.minimumValue = 1
sL.maximumValue = 25
sH.minimumValue = 1
sH.maximumValue = 25
sW.minimumValue = 1
sW.maximumValue = 25
onOfSwitch.isOn = false
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:)))
scnView.addGestureRecognizer(tapGesture)
//3
let rotationGesture = UIRotationGestureRecognizer(target: self, action: #selector(handleRotation(_:)))
scnView.addGestureRecognizer(rotationGesture)
}
@objc func copyM() {
guard let originalNode = selectedNode else { return }
let clonedNode = originalNode.clone()
clonedNode.position = SCNVector3(
originalNode.position.x + 1.0,
originalNode.position.y + 1.0,
originalNode.position.z
)
scnView.scene?.rootNode.addChildNode(clonedNode)
selectedNode = clonedNode
}
@objc func depthTextChanged(_ sender: UITextField) {
guard let currentView = selectedNode else { return }
guard let text = sender.text, let newDepth = Float(text) else { return }
if let box = currentView.geometry as? SCNBox {
box.length = CGFloat(newDepth)
applyTextAsTexture55(to: box, width: sW.value, height: sH.value, depth: newDepth)
} else if let cylinder = currentView.geometry as? SCNCylinder {
// Treat "depth" as diameter here
cylinder.radius = CGFloat(newDepth / 2)
applyTextAsTextureToCylinder(cylinder, width: newDepth, height: sH.value)
}
}
@objc func libraryBUttonFunction() {
print("Library Button Selected")
// Replace YourViewController with the name of the view controller you want to present
let destinationVC = Second()
// Customize the modal presentation style (optional)
destinationVC.modalPresentationStyle = .fullScreen // or .overFullScreen, .pageSheet, etc.
// Present the view controller modally
self.present(destinationVC, animated: true, completion: nil)
}
@objc func heightTextChanged(_ sender: UITextField) {
guard let currentView = selectedNode else { return }
guard let text = sender.text, let newHeight = Float(text) else { return }
if let box = currentView.geometry as? SCNBox {
box.height = CGFloat(newHeight)
applyTextAsTexture55(to: box, width: sW.value, height: newHeight, depth: sL.value)
} else if let cylinder = currentView.geometry as? SCNCylinder {
cylinder.height = CGFloat(newHeight)
applyTextAsTextureToCylinder(cylinder, width: sW.value, height: newHeight)
}
}
@objc func widthTextChanged(_ sender: UITextField) {
guard let currentView = selectedNode else { return }
guard let text = sender.text, let newWidth = Float(text) else { return }
if let box = currentView.geometry as? SCNBox {
box.width = CGFloat(newWidth)
applyTextAsTexture55(to: box, width: newWidth, height: sH.value, depth: sL.value)
} else if let cylinder = currentView.geometry as? SCNCylinder {
cylinder.radius = CGFloat(newWidth / 2)
applyTextAsTextureToCylinder(cylinder, width: newWidth, height: sH.value)
}
}
@objc func handleTap(_ gesture: UITapGestureRecognizer) {
let location = gesture.location(in: scnView)
let hitResults = scnView.hitTest(location, options: nil)
if let result = hitResults.first {
selectedNode = result.node
print("Selected a node: \(selectedNode!)")
} else {
selectedNode = nil
print("No node selected.")
}
}
func setupCamera() {
cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
cameraNode.position = SCNVector3(0, 0, 10)
scnView.scene?.rootNode.addChildNode(cameraNode)
// Set the camera as the active point of view
scnView.pointOfView = cameraNode
}
func setupLight() {
let lightNode = SCNNode()
lightNode.light = SCNLight()
lightNode.light?.type = .omni
lightNode.position = SCNVector3(0, 10, 10)
scnView.scene?.rootNode.addChildNode(lightNode)
let ambientLight = SCNNode()
ambientLight.light = SCNLight()
ambientLight.light?.type = .ambient
ambientLight.light?.color = UIColor.darkGray
scnView.scene?.rootNode.addChildNode(ambientLight)
}
@objc func toggleCameraControl() {
if onOfSwitch.isOn {
scnView.allowsCameraControl = true
// Remove pan and pinch gestures
if let pan = panGesture {
scnView.removeGestureRecognizer(pan)
panGesture = nil
}
if let pinch = pinchGesture {
scnView.removeGestureRecognizer(pinch)
pinchGesture = nil
}
} else {
scnView.allowsCameraControl = false
if panGesture == nil {
let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePan(_:)))
scnView.addGestureRecognizer(pan)
panGesture = pan
}
if pinchGesture == nil {
let pinch = UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(_:)))
scnView.addGestureRecognizer(pinch)
pinchGesture = pinch
}
}
}
@objc func handlePinch(_ gesture: UIPinchGestureRecognizer) {
guard let camera = scnView.pointOfView else { return }
if gesture.state == .changed {
let scale = Float(gesture.scale)
var position = camera.position
position.z /= scale // Zoom in or out
position.z = max(min(position.z, 100), 1) // Clamp zoom
camera.position = position
gesture.scale = 1
}
}
@objc func addCylinder() {
let radius = CGFloat(sW.value / 2)
let height = CGFloat(sH.value * 3)
let cylinder = SCNCylinder(radius: radius, height: height)
applyTextAsTextureToCylinder(cylinder, width: sW.value, height: sH.value)
let cylinderNode = SCNNode(geometry: cylinder)
cylinderNode.position = SCNVector3(0, 0, 0)
scnView.scene?.rootNode.addChildNode(cylinderNode)
selectedNode = cylinderNode
}
var panGesture: UIPanGestureRecognizer?
@objc func handlePan(_ gesture: UIPanGestureRecognizer) {
let location = gesture.location(in: scnView)
switch gesture.state {
case .began:
let hitResults = scnView.hitTest(location, options: nil)
if let hitNode = hitResults.first?.node,
let geometry = hitNode.geometry,
geometry is SCNBox || geometry is SCNCylinder {
selectedNode = hitNode
}
case .changed:
guard let selectedNode = selectedNode else { return }
let translation = gesture.translation(in: scnView)
let deltaX = Float(translation.x) * 0.01
let deltaY = Float(-translation.y) * 0.01
selectedNode.position.x += deltaX
selectedNode.position.y += deltaY
gesture.setTranslation(.zero, in: scnView)
default:
break
}
}
@objc func handleRotation(_ gesture: UIRotationGestureRecognizer) {
guard let node = selectedNode else { return }
if gesture.state == .changed {
node.eulerAngles.y += Float(gesture.rotation)
gesture.rotation = 0
}
}
func createCylinder(radius: CGFloat, height: CGFloat) -> SCNNode {
let cylinder = SCNCylinder(radius: radius, height: height)
cylinder.firstMaterial?.diffuse.contents = UIColor.lightGray
cylinder.firstMaterial?.isDoubleSided = true
cylinder.radialSegmentCount = 20 // Boxier look
let node = SCNNode(geometry: cylinder)
node.position = SCNVector3(0, 0, 0)
return node
}
func applyTextAsTextureToCylinder(_ cylinder: SCNCylinder, width: Float, height: Float) {
let sideImage = drawCylinderHeightLabel(height: height)
let topImage = drawCylinderTopWidthLabel(width: width)
let sideMaterial = SCNMaterial()
sideMaterial.diffuse.contents = sideImage
sideMaterial.isDoubleSided = true
let topMaterial = SCNMaterial()
topMaterial.diffuse.contents = topImage
topMaterial.isDoubleSided = true
let blankMaterial = SCNMaterial()
blankMaterial.diffuse.contents = UIColor.lightGray
cylinder.materials = [
sideMaterial, // side
topMaterial, // top
blankMaterial // bottom (optional)
]
}
func drawCylinderHeightLabel(height: Float) -> UIImage {
let size = CGSize(width: 256, height: 512)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
guard let context = UIGraphicsGetCurrentContext() else { return UIImage() }
UIColor.white.setFill()
context.fill(CGRect(origin: .zero, size: size))
let width = sW.value
let aspectRatio = width / height
let heightText = "height: \(sH.value)"
// New: Reasonable bounds for font size
let baseFontSize: CGFloat = 16
let minFontSize: CGFloat = 8
let maxFontSize: CGFloat = 32
var fontSize: CGFloat
if aspectRatio > 3 {
print("a")
// fontSize = max(minFontSize, baseFontSize * CGFloat((height / width)) * 8)
fontSize = max(minFontSize, baseFontSize * CGFloat(sW.value))
} else {
print("b")
fontSize = max(minFontSize, baseFontSize * CGFloat((height / width)) * 2.5)
}
fontSize = min(fontSize, maxFontSize)
let font = UIFont.systemFont(ofSize: fontSize)
let attributes: [NSAttributedString.Key: Any] = [
.font: font,
.foregroundColor: UIColor.black
]
if aspectRatio > 3 {
print("1")
// Wide, flat cylinder – draw horizontal centered
let textSize = (heightText as NSString).size(withAttributes: attributes)
let rect = CGRect(
x: (size.width - textSize.width) / 2 ,
y: (size.height - textSize.height) / 2,
width: textSize.width,
height: textSize.height * 5
)
(heightText as NSString).draw(in: rect, withAttributes: attributes)
} else {
print("2")
// Taller cylinder – draw vertically rotated
context.saveGState()
context.translateBy(x: size.width / 2, y: size.height / 2)
context.rotate(by: -.pi / 2)
let rect = CGRect(x: -128, y: -20, width: 256, height: 40)
(heightText as NSString).draw(in: rect, withAttributes: attributes)
context.restoreGState()
}
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image ?? UIImage()
}
func drawCylinderTopWidthLabel(width: Float) -> UIImage {
let size = CGSize(width: 256, height: 256)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
guard let context = UIGraphicsGetCurrentContext() else { return UIImage() }
// Fill background
UIColor.white.setFill()
context.fill(CGRect(origin: .zero, size: size))
// Text attributes
let font = UIFont.systemFont(ofSize: 28, weight: .bold)
let attributes: [NSAttributedString.Key: Any] = [
.font: font,
.foregroundColor: UIColor.black
]
let widthText = "width: \(Int(width * 1))"
let textSize = (widthText as NSString).size(withAttributes: attributes)
// Move to center, flip horizontally
context.translateBy(x: size.width / 2, y: size.height / 2)
context.scaleBy(x: -1.0, y: 1.0) // 🔁 Horizontal mirror
context.rotate(by: (3 * .pi) / 2) // 180 degrees
// Draw centered mirrored text
let rect = CGRect(
x: -textSize.width / 2,
y: -textSize.height / 2,
width: textSize.width,
height: textSize.height
)
(widthText as NSString).draw(in: rect, withAttributes: attributes)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image ?? UIImage()
}
func drawTopWithDepth(depth: Float) -> UIImage {
let size = CGSize(width: 256, height: 256)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
guard let context = UIGraphicsGetCurrentContext() else { return UIImage() }
UIColor.white.setFill()
context.fill(CGRect(origin: .zero, size: size))
let font = UIFont.systemFont(ofSize: 28)
let attributes: [NSAttributedString.Key: Any] = [
.font: font,
.foregroundColor: UIColor.black
]
let depthText = "depth: \(Int(depth * 1))"
// Rotate and place on bottom right corner of top face
context.saveGState()
context.translateBy(x: size.width - 40, y: size.height - 20)
context.rotate(by: -.pi / 2)
let rect = CGRect(x: 0, y: 0, width: 200, height: 40)
(depthText as NSString).draw(in: rect, withAttributes: attributes)
context.restoreGState()
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image ?? UIImage()
}
func applyTextAsTexture55(to box: SCNBox, width: Float, height: Float, depth: Float) {
let blankMaterial = SCNMaterial()
blankMaterial.diffuse.contents = UIColor.lightGray
blankMaterial.isDoubleSided = true
// Front face: width + height
let frontImage = drawFrontWithWidthAndHeight(width: width, height: height)
let frontMaterial = SCNMaterial()
frontMaterial.diffuse.contents = frontImage
frontMaterial.isDoubleSided = true
// Top face: depth
let topImage = drawTopWithDepth(depth: depth)
let topMaterial = SCNMaterial()
topMaterial.diffuse.contents = topImage
topMaterial.isDoubleSided = true
box.materials = [
frontMaterial, // front
blankMaterial, // right
blankMaterial, // back
blankMaterial, // left
topMaterial, // top
blankMaterial // bottom
]
}
func drawFrontWithWidthAndHeight(width: Float, height: Float) -> UIImage {
let size = CGSize(width: 256, height: 256)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
guard let context = UIGraphicsGetCurrentContext() else { return UIImage() }
// Background
UIColor.white.setFill()
context.fill(CGRect(origin: .zero, size: size))
// Font and style
let font = UIFont.systemFont(ofSize: 28)
let attributes: [NSAttributedString.Key: Any] = [
.font: font,
.foregroundColor: UIColor.black
]
// 1. Draw width at top-left
let widthText = "width: \(Int(width * 10))"
let widthRect = CGRect(x: 10, y: 10, width: 200, height: 40)
(widthText as NSString).draw(in: widthRect, withAttributes: attributes)
// 2. Draw rotated height on right edge
let heightText = "height: \(Int(height * 10))"
context.saveGState()
// Translate to bottom-right corner, then rotate counter-clockwise
context.translateBy(x: size.width - 40, y: size.height - 20)
context.rotate(by: -.pi / 2)
let heightRect = CGRect(x: 0, y: 0, width: 200, height: 40)
(heightText as NSString).draw(in: heightRect, withAttributes: attributes)
context.restoreGState()
// Debug border (optional)
// UIColor.black.setStroke()
// context.stroke(CGRect(origin: .zero, size: size), width: 2)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image ?? UIImage()
}
@objc func updateBoxSize() {
guard let selectedNode = selectedNode else { return }
let width = sW.value
let height = sH.value
let depth = sL.value
if let box = selectedNode.geometry as? SCNBox {
box.width = CGFloat(width)
box.height = CGFloat(height)
box.length = CGFloat(depth)
applyTextAsTexture55(to: box, width: width, height: height, depth: depth)
} else if let cylinder = selectedNode.geometry as? SCNCylinder {
cylinder.radius = CGFloat(width / 2) // radius = width / 2 for diameter control
cylinder.height = CGFloat(height)
applyTextAsTextureToCylinder(cylinder, width: width, height: height)
}
}
}
Solution
When the aspectRatio is very high (wide, flat cylinder), your code multiplies the font size by a large factor (180), and then draws the text inside a rect where the height is textSize.height * 20, leading to stretched, unreadable text.
Instead of scaling font size so dramatically when aspectRatio > 3, you should
Keep a reasonable font size, maybe scale it mildly based on aspect ratio
Adjust the
rectheight to match the text height (no huge multiplier)For the horizontal case, align the text nicely in a centered rect without distorting its height
Updated/ Revised code is as below.
func drawCylinderHeightLabel(height: Float) -> UIImage {
let size = CGSize(width: 256, height: 512)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
guard let context = UIGraphicsGetCurrentContext() else { return UIImage() }
UIColor.white.setFill()
context.fill(CGRect(origin: .zero, size: size))
let width = sW.value
let aspectRatio = width / height
let heightText = "height: \(Int(height))"
// Reasonable font sizes
let baseFontSize: CGFloat = 28
let minFontSize: CGFloat = 14
let maxFontSize: CGFloat = 36
// Adjust font size based on aspect ratio, but within safe bounds
var fontSize: CGFloat
if aspectRatio > 3 {
fontSize = baseFontSize * (3 / aspectRatio) // decrease size as aspect ratio increases
} else {
fontSize = baseFontSize * (height / width) * 2.5
}
fontSize = min(max(fontSize, minFontSize), maxFontSize)
let font = UIFont.systemFont(ofSize: fontSize)
let attributes: [NSAttributedString.Key: Any] = [
.font: font,
.foregroundColor: UIColor.black
]
if aspectRatio > 3 {
// Horizontal label
let textSize = (heightText as NSString).size(withAttributes: attributes)
let rect = CGRect(
x: (size.width - textSize.width) / 2,
y: (size.height - textSize.height) / 2,
width: textSize.width,
height: textSize.height
)
(heightText as NSString).draw(in: rect, withAttributes: attributes)
} else {
// Vertical rotated label
context.saveGState()
context.translateBy(x: size.width / 2, y: size.height / 2)
context.rotate(by: -.pi / 2)
let textSize = (heightText as NSString).size(withAttributes: attributes)
let rect = CGRect(
x: -textSize.width / 2,
y: -textSize.height / 2,
width: textSize.width,
height: textSize.height
)
(heightText as NSString).draw(in: rect, withAttributes: attributes)
context.restoreGState()
}
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image ?? UIImage()
}
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