I am trying to make a rectangle that is made of little squares in it. I am able to create the rectangle using the code given but I want to add a marking on the squares. This way the user can make a distinction between each and every square. I want it to look like a grid.
func drawBoard(boundingRect: CGSize) -> some View {
let columns = self.numColumns
let rows = self.numRows
let blocksize = min(boundingRect.width/CGFloat(columns), boundingRect.height/CGFloat(rows))
let xoffset = (boundingRect.width - blocksize*CGFloat(columns))/2
let yoffset = (boundingRect.height - blocksize*CGFloat(rows))/2
let gameBoard = self.gameBoard
return ForEach(0...columns-1, id:\.self) { (column:Int) in
ForEach(0...rows-1, id:\.self) { (row:Int) in
Path { path in
let x = xoffset + blocksize * CGFloat(column)
let y = boundingRect.height - yoffset - blocksize*CGFloat(row+1)
let rect = CGRect(x: x, y: y, width: blocksize, height: blocksize)
path.addRect(rect)
}
.fill(gameBoard[column][row].color)
}
}
}
I am willing to change the entire code. I just need to make a grid...
GRID
Something like this or with borders or anything. Please help with this solution.
Related
I have an array of buttons and when I append them to a view I want the to be positioned around a image view which is in the center. Based on how many objects there are in the array, I want them to be evenly spaced around the whole circle. Below is my attempt to do so. What am I doing wrong and how should I fix it? There is more than one button behind the moose.
var userbutton = [UIButton]()
var upimage = [UIImage]()
var locationpic = [AnyObject]()
func locationsSet(){
for (index, users) in upimage.enumerate() {
let userbutton = UIButton()
userbutton.addTarget(self, action: "buttonAction:", forControlEvents: .TouchUpInside)
userbutton.frame = CGRectMake(100, 100, 50, 50)
userbutton.layer.cornerRadius = userbutton.frame.size.width/2
userbutton.clipsToBounds = true
userbutton.setImage(users, forState: .Normal)
let radians = CGFloat(M_PI) * 2.0 / CGFloat(upimage.count) * CGFloat(index)
let centerx = self.view.bounds.width / 2.0
let radius = currentuserpic.frame.size.width / 2.0
let centery = self.view.bounds.height / 2.0
let pointx = centerx + cos(radians) * (radius + 40)
let pointy = (centery) + (sin(radians)) * (radius + 40)
userbutton.center.x = pointx
userbutton.center.y = pointy
self.userbutton.append(userbutton)
self.view.addSubview(userbutton)
print("x\(pointx)")
print("y\(pointy)")
}
}
How I would do this:
Create an extension to UIView to get the diagonal and radius. These are handy because we want our "satellites" to have predictable placing even when the "planet" isn't square.
extension UIView {
var diagonal : CGFloat {
return sqrt(pow(self.frame.width, 2) + pow(self.frame.height, 2))
}
var radius : CGFloat {
return diagonal / 2
}
}
This will return a point based on an angle and a distance from an origin.
It uses dreadful trigonometry.
func getPoint(fromPoint point: CGPoint, atDistance distance: CGFloat, withAngleRadians angle:CGFloat) -> CGPoint {
let x = point.x
let y = point.y
let dx = (distance * cos(angle))
let dy = (distance * sin(angle))
return CGPoint(x: (dx + x), y: (dy + y))
}
Now the real function. Generate a bunch of points in a circle pattern. I used a running sum for the angle instead of multiplying each time by the index. This just returns the centre points for the views.
func encirclePoint(point : CGPoint, distance:CGFloat, inParts parts: Int) -> [CGPoint] {
let angle = 2 * CGFloat(M_PI) / CGFloat(parts) // critical part, you need radians for trigonometry
var runningAngle : CGFloat = -(CGFloat(M_PI) / 2) // start at the top
var points : [CGPoint] = []
for _ in 0..<parts {
let circlePoint = getPoint(fromPoint: point, atDistance: distance, withAngleRadians: runningAngle)
points.append(circlePoint)
runningAngle += angle
}
return points
}
Now you can create a simple function that takes a view, a margin and an array of "satellite" views. It will set their centre and add them to the superview of the view we used to input. It makes sense not to add them to the view itself since they might not be placed inside it.
func encircleView(view : UIView, withSubViews subViews : [UIView], withMargin margin : CGFloat) {
guard !(subViews.isEmpty) else { // if there are no subviews : abort
return
}
let distance = view.radius + margin
let points = encirclePoint(view.center, distance: distance, inParts: subViews.count)
guard subViews.count == points.count, let uberView = view.superview else { // if the count is not the same or there is no superview: abort
return
}
for (point, subView) in zip(points, subViews) { subView.center = point }
}
Notice how I did nothing except for the centre calculations in these functions. Styling them goes in another function. This makes it super easy to maintain and debug.
I might even let the last function just return the subviews with updated frames and add them later.
Or negative margin :)
Gist
A full circle is 2 * pi radians. You need to divide that by the number of items you have and multiply that by the index of the item you are currently processing. Use trig to find the location on the circle:
for (index, users) in upimage.enumerate() {
let radians = CGFloat(M_PI) * 2.0 / CGFloat(upimage.count) * CGFloat(index)
......
let centerx = self.view.bounds.width / 2.0
let radius = currentuserpic.frame.size.width / 2.0
let centery = self.view.bounds.height / 2.0
let pointx = centerx + cos(radians) * radius
let pointy = centery + sin(radians) * radius
......
}
I have an array of buttons and when I append them to a view I want the to be positioned around a image view which is in the center. Based on how many objects there are in the array, I want them to be evenly spaced around the whole circle. Below is my attempt to do so. What am I doing wrong and how should I fix it? There is more than one button behind the moose.
var userbutton = [UIButton]()
var upimage = [UIImage]()
var locationpic = [AnyObject]()
func locationsSet(){
for (index, users) in upimage.enumerate() {
let userbutton = UIButton()
userbutton.addTarget(self, action: "buttonAction:", forControlEvents: .TouchUpInside)
userbutton.frame = CGRectMake(100, 100, 50, 50)
userbutton.layer.cornerRadius = userbutton.frame.size.width/2
userbutton.clipsToBounds = true
userbutton.setImage(users, forState: .Normal)
let radians = CGFloat(M_PI) * 2.0 / CGFloat(upimage.count) * CGFloat(index)
let centerx = self.view.bounds.width / 2.0
let radius = currentuserpic.frame.size.width / 2.0
let centery = self.view.bounds.height / 2.0
let pointx = centerx + cos(radians) * (radius + 40)
let pointy = (centery) + (sin(radians)) * (radius + 40)
userbutton.center.x = pointx
userbutton.center.y = pointy
self.userbutton.append(userbutton)
self.view.addSubview(userbutton)
print("x\(pointx)")
print("y\(pointy)")
}
}
How I would do this:
Create an extension to UIView to get the diagonal and radius. These are handy because we want our "satellites" to have predictable placing even when the "planet" isn't square.
extension UIView {
var diagonal : CGFloat {
return sqrt(pow(self.frame.width, 2) + pow(self.frame.height, 2))
}
var radius : CGFloat {
return diagonal / 2
}
}
This will return a point based on an angle and a distance from an origin.
It uses dreadful trigonometry.
func getPoint(fromPoint point: CGPoint, atDistance distance: CGFloat, withAngleRadians angle:CGFloat) -> CGPoint {
let x = point.x
let y = point.y
let dx = (distance * cos(angle))
let dy = (distance * sin(angle))
return CGPoint(x: (dx + x), y: (dy + y))
}
Now the real function. Generate a bunch of points in a circle pattern. I used a running sum for the angle instead of multiplying each time by the index. This just returns the centre points for the views.
func encirclePoint(point : CGPoint, distance:CGFloat, inParts parts: Int) -> [CGPoint] {
let angle = 2 * CGFloat(M_PI) / CGFloat(parts) // critical part, you need radians for trigonometry
var runningAngle : CGFloat = -(CGFloat(M_PI) / 2) // start at the top
var points : [CGPoint] = []
for _ in 0..<parts {
let circlePoint = getPoint(fromPoint: point, atDistance: distance, withAngleRadians: runningAngle)
points.append(circlePoint)
runningAngle += angle
}
return points
}
Now you can create a simple function that takes a view, a margin and an array of "satellite" views. It will set their centre and add them to the superview of the view we used to input. It makes sense not to add them to the view itself since they might not be placed inside it.
func encircleView(view : UIView, withSubViews subViews : [UIView], withMargin margin : CGFloat) {
guard !(subViews.isEmpty) else { // if there are no subviews : abort
return
}
let distance = view.radius + margin
let points = encirclePoint(view.center, distance: distance, inParts: subViews.count)
guard subViews.count == points.count, let uberView = view.superview else { // if the count is not the same or there is no superview: abort
return
}
for (point, subView) in zip(points, subViews) { subView.center = point }
}
Notice how I did nothing except for the centre calculations in these functions. Styling them goes in another function. This makes it super easy to maintain and debug.
I might even let the last function just return the subviews with updated frames and add them later.
Or negative margin :)
Gist
A full circle is 2 * pi radians. You need to divide that by the number of items you have and multiply that by the index of the item you are currently processing. Use trig to find the location on the circle:
for (index, users) in upimage.enumerate() {
let radians = CGFloat(M_PI) * 2.0 / CGFloat(upimage.count) * CGFloat(index)
......
let centerx = self.view.bounds.width / 2.0
let radius = currentuserpic.frame.size.width / 2.0
let centery = self.view.bounds.height / 2.0
let pointx = centerx + cos(radians) * radius
let pointy = centery + sin(radians) * radius
......
}
What would be the best way to draw a grid like this by using the SpriteKit 2D game engine?
Requirements:
Input programatically the number of columns and rows (5x5, 10x3, 3x4 etc.).
Draw it programmatically using something like SKSpriteNode or SKShapeNode, since just using images of a square like this doesn't seem very efficient to me.
The squares should have a fixed size (let's say each is 40x40).
The grid should be vertically and horizontally centred in the view.
I'm planning to use a SKSpriteNode (from an image) as a player moving in different squares in this grid.
So, I'll save in a 2 dimensional array the central point (x,y) of each square and then move from the player's current position to that position. If you have a better suggestion for this too, I'd like to hear it.
I would appreciate a solution in Swift (preferably 2.1), but Objective-C would do too. Planning on using this only on iPhone devices.
My question is close to this one. Any help is appreciated.
I suggest you implement the grid as a texture of an SKSpriteNode because Sprite Kit will renders the grid in a single draw call. Here's a example of how to do that:
class Grid:SKSpriteNode {
var rows:Int!
var cols:Int!
var blockSize:CGFloat!
convenience init?(blockSize:CGFloat,rows:Int,cols:Int) {
guard let texture = Grid.gridTexture(blockSize: blockSize,rows: rows, cols:cols) else {
return nil
}
self.init(texture: texture, color:SKColor.clear, size: texture.size())
self.blockSize = blockSize
self.rows = rows
self.cols = cols
}
class func gridTexture(blockSize:CGFloat,rows:Int,cols:Int) -> SKTexture? {
// Add 1 to the height and width to ensure the borders are within the sprite
let size = CGSize(width: CGFloat(cols)*blockSize+1.0, height: CGFloat(rows)*blockSize+1.0)
UIGraphicsBeginImageContext(size)
guard let context = UIGraphicsGetCurrentContext() else {
return nil
}
let bezierPath = UIBezierPath()
let offset:CGFloat = 0.5
// Draw vertical lines
for i in 0...cols {
let x = CGFloat(i)*blockSize + offset
bezierPath.move(to: CGPoint(x: x, y: 0))
bezierPath.addLine(to: CGPoint(x: x, y: size.height))
}
// Draw horizontal lines
for i in 0...rows {
let y = CGFloat(i)*blockSize + offset
bezierPath.move(to: CGPoint(x: 0, y: y))
bezierPath.addLine(to: CGPoint(x: size.width, y: y))
}
SKColor.white.setStroke()
bezierPath.lineWidth = 1.0
bezierPath.stroke()
context.addPath(bezierPath.cgPath)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return SKTexture(image: image!)
}
func gridPosition(row:Int, col:Int) -> CGPoint {
let offset = blockSize / 2.0 + 0.5
let x = CGFloat(col) * blockSize - (blockSize * CGFloat(cols)) / 2.0 + offset
let y = CGFloat(rows - row - 1) * blockSize - (blockSize * CGFloat(rows)) / 2.0 + offset
return CGPoint(x:x, y:y)
}
}
And here's how to create a grid and add a game piece to the grid
class GameScene: SKScene {
override func didMove(to: SKView) {
if let grid = Grid(blockSize: 40.0, rows:5, cols:5) {
grid.position = CGPoint (x:frame.midX, y:frame.midY)
addChild(grid)
let gamePiece = SKSpriteNode(imageNamed: "Spaceship")
gamePiece.setScale(0.0625)
gamePiece.position = grid.gridPosition(row: 1, col: 0)
grid.addChild(gamePiece)
}
}
}
Update:
To determine which grid square was touched, add this to init
self.isUserInteractionEnabled = true
and this to the Grid class:
override func touchesBegan(_ touches: Set<UITouch>, withEvent event: UIEvent?) {
for touch in touches {
let position = touch.location(in:self)
let node = atPoint(position)
if node != self {
let action = SKAction.rotate(by:CGFloat.pi*2, duration: 1)
node.run(action)
}
else {
let x = size.width / 2 + position.x
let y = size.height / 2 - position.y
let row = Int(floor(x / blockSize))
let col = Int(floor(y / blockSize))
print("\(row) \(col)")
}
}
}
I've been racking my brain and searching here and all over to try to find out how to generate a random position on screen to spawn a circle. I'm hoping someone here can help me because I'm completely stumped. Basically, I'm trying to create a shape that always spawns in a random spot on screen when the user touches.
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenHeight = screenSize.height
let screenWidth = screenSize.width
let currentBall = SKShapeNode(circleOfRadius: 100)
currentBall.position = CGPointMake(CGFloat(arc4random_uniform(UInt32(Float(screenWidth)))), CGFloat(arc4random_uniform(UInt32(Float(screenHeight)))))
self.removeAllChildren()
self.addChild(currentBall)
}
If you all need more of my code, there really isn't any more. But thank you for whatever help you can give! (Just to reiterate, this code kind of works... But a majority of the spawned balls seem to spawn offscreen)
The problem there is that you scene is bigger than your screen bounds
let viewMidX = view!.bounds.midX
let viewMidY = view!.bounds.midY
print(viewMidX)
print(viewMidY)
let sceneHeight = view!.scene!.frame.height
let sceneWidth = view!.scene!.frame.width
print(sceneWidth)
print(sceneHeight)
let currentBall = SKShapeNode(circleOfRadius: 100)
currentBall.fillColor = .green
let x = view!.scene!.frame.midX - viewMidX + CGFloat(arc4random_uniform(UInt32(viewMidX*2)))
let y = view!.scene!.frame.midY - viewMidY + CGFloat(arc4random_uniform(UInt32(viewMidY*2)))
print(x)
print(y)
currentBall.position = CGPoint(x: x, y: y)
view?.scene?.addChild(currentBall)
self.removeAllChildren()
self.addChild(currentBall)
First: Determine the area that will be valid. It might not be the frame of the superview because perhaps the ball (let's call it ballView) might be cut off. The area will likely be (in pseudocode):
CGSize( Width of the superview - width of ballView , Height of the superview - height of ballView)
Once you have a view of that size, just place it on screen with the origin 0, 0.
Secondly: Now you have a range of valid coordinates. Just use a random function (like the one you are using) to select one of them.
Create a swift file with the following:
extension Int
{
static func random(range: Range<Int>) -> Int
{
var offset = 0
if range.startIndex < 0 // allow negative ranges
{
offset = abs(range.startIndex)
}
let mini = UInt32(range.startIndex + offset)
let maxi = UInt32(range.endIndex + offset)
return Int(mini + arc4random_uniform(maxi - mini)) - offset
}
}
And now you can specify a random number as follows:
Int.random(1...1000) //generate a random number integer somewhere from 1 to 1000.
You can generate the values for the x and y coordinates now using this function.
Given the following random generators:
public extension CGFloat {
public static var random: CGFloat { return CGFloat(arc4random()) / CGFloat(UInt32.max) }
public static func random(between x: CGFloat, and y: CGFloat) -> CGFloat {
let (start, end) = x < y ? (x, y) : (y, x)
return start + CGFloat.random * (end - start)
}
}
public extension CGRect {
public var randomPoint: CGPoint {
var point = CGPoint()
point.x = CGFloat.random(between: origin.x, and: origin.x + width)
point.y = CGFloat.random(between: origin.y, and: origin.y + height)
return point
}
}
You can paste the following into a playground:
import XCPlayground
import SpriteKit
let view = SKView(frame: CGRect(x: 0, y: 0, width: 500, height: 500))
XCPShowView("game", view)
let scene = SKScene(size: view.frame.size)
view.presentScene(scene)
let wait = SKAction.waitForDuration(0.5)
let popIn = SKAction.scaleTo(1, duration: 0.25)
let popOut = SKAction.scaleTo(0, duration: 0.25)
let remove = SKAction.removeFromParent()
let popInAndOut = SKAction.sequence([popIn, wait, popOut, remove])
let addBall = SKAction.runBlock { [unowned scene] in
let ballRadius: CGFloat = 25
let ball = SKShapeNode(circleOfRadius: ballRadius)
var popInArea = scene.frame
popInArea.inset(dx: ballRadius, dy: ballRadius)
ball.position = popInArea.randomPoint
ball.xScale = 0
ball.yScale = 0
ball.runAction(popInAndOut)
scene.addChild(ball)
}
scene.runAction(SKAction.repeatActionForever(SKAction.sequence([addBall, wait])))
(Just make sure to also paste in the random generators, too, or to copy them to the playground's Sources, as well as to open the assistant editor so you can see the animation.)
I've created a sub class of a UIView in which I draw a graph. I made it a public class so I can pass it new data and have it update when needed.
It all worked perfectly until I upgraded to Xcode 6.3 / Swift 1.2. Now when that view attempts to render my app crashes.
The error I get is:
Assertion failed: (CGFloatIsValid(x) && CGFloatIsValid(y)), function void CGPathMoveToPoint(CGMutablePathRef, const
CGAffineTransform *, CGFloat, CGFloat), file Paths/CGPath.cc, line
254.
Here is my code for the class:
import UIKit
public class GraphView: UIView {
//Data from parent VC
var graphPoints = [0, 0, 0, 0, 0, 0, 0]
var keyColor = BabyMasterStyleKit.bathsBase
override public func drawRect(rect: CGRect) {
let context = UIGraphicsGetCurrentContext()
let colorSpace = CGColorSpaceCreateDeviceRGB()
let width = rect.width
let height = rect.height
//calculate the x point
let margin:CGFloat = 15.0
var columnXPoint = { (column:Int) -> CGFloat in
//Calculate gap between points
let spacer = (width - margin*2 - 4) /
CGFloat((self.graphPoints.count - 1))
var x:CGFloat = CGFloat(column) * spacer
x += margin + 2
return x
}
// calculate the y point
let topBorder:CGFloat = 15
let bottomBorder:CGFloat = 15
let graphHeight = height - topBorder - bottomBorder
let maxValue = maxElement(graphPoints)
var columnYPoint = { (graphPoint:Int) -> CGFloat in
var y:CGFloat = CGFloat(graphPoint) /
CGFloat(maxValue) * graphHeight
y = graphHeight + topBorder - y // Flip the graph
return y
}
//Draw horizontal graph lines on the top of everything
var linePath = UIBezierPath()
//top line
linePath.moveToPoint(CGPoint(x:0, y: topBorder))
linePath.addLineToPoint(CGPoint(x: width,
y:topBorder))
//center line
linePath.moveToPoint(CGPoint(x:0,
y: graphHeight/2 + topBorder))
linePath.addLineToPoint(CGPoint(x:width,
y:graphHeight/2 + topBorder))
let color = UIColor.lightGrayColor()
color.setStroke()
linePath.lineWidth = 0.5
linePath.stroke()
// draw the line graph
keyColor.setFill()
keyColor.setStroke()
// set up the points line
var graphPath = UIBezierPath()
// go to start of line
graphPath.moveToPoint(CGPoint(x:columnXPoint(0), y:columnYPoint(graphPoints[0])))
// add points for each item in the graph points array
// at the correct (x, y) for the point
for i in 1..<graphPoints.count {
let nextPoint = CGPoint(x:columnXPoint(i),
y:columnYPoint(graphPoints[i]))
graphPath.addLineToPoint(nextPoint)
}
graphPath.stroke()
//Draw the circles on top of graph stroke
for i in 0..<graphPoints.count {
var point = CGPoint(x:columnXPoint(i), y:columnYPoint(graphPoints[i]))
point.x -= 5.0/2
point.y -= 5.0/2
let circle = UIBezierPath(ovalInRect:
CGRect(origin: point,
size: CGSize(width: 6.0, height: 6.0)))
circle.fill()
}
// add left and bottom borders
UIColor.lightGrayColor().setStroke()
var borderPath = UIBezierPath()
borderPath.moveToPoint(CGPoint(x:0, y:0))
borderPath.addLineToPoint(CGPoint(x:0, y:height))
borderPath.addLineToPoint(CGPoint(x:width, y:height))
borderPath.stroke()
}
}
The app fails at this line:
graphPath.moveToPoint(CGPoint(x:columnXPoint(0), y:columnYPoint(graphPoints[0])))
The array graphPoints is the data I am passing in. I have it set to all 0s as a default. In my ViewController I have a function that passes in an array of real data (7 different numbers) and then does a setNeedsDislay() to re-render the view as needed.
Thanks for your help.
When the input array is
var graphPoints = [0, 0, 0, 0, 0, 0, 0]
then
let maxValue = maxElement(graphPoints)
makes maxValue 0, so that the line in columnYpoint
var y:CGFloat = CGFloat(graphPoint) / CGFloat(maxValue) * graphHeight
does a divide-by-zero and makes y a NaN. It's a special case of having all zero elements in the initial array.
I think the default graphPoints array was being ignored, so when the view first loaded it didn't have values (though it did show that it was passing a 0 into the columnYPoint function, so who knows). As a work around I just tested for y.isNAN and if it was set it to equal 0. After I did that everything worked.
edit: Just checked to see if in fact the default array for graphPoints was getting ignored, and it wasn't. I think that it just doesn't like that it was being passed in a 0 value. If anyone has an idea as to why this would be, I'd love to hear about it.