Rotate array
Hello!
We have an 1Darray with values and we want to rotate/shift the values (3 positions). But everytime it shifts we want to read the array.
For example : we have [1 2 3 4 5 6 7 8 9 10 ] and we want to shift it 3 positions like [10 9 8 1 2 3 4 5 6 7] we want to send this array, read it and then to rotate and read it every time until we get the first array.
Do we have to use loops or we can set it directly?
Any answers are welcome!
Thank You!
Solved!
Go to Solution.
Why do people always insist on making things way more complicated than it needs to be...
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Attachments:
Rotate and send.png 17 KB
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public abstract class ArrayShape implements ThreeDObject {
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}Ok I am trying to create the 5 tetris shapes. The I, L, Z, T, and the Block. For each shape I want to fill the _shape array:
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It's in my biggest interest to let my users view my 3d-models using Flash Player, while maintenancing the interactivity. Is this possible to do?
Benefits:
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As far as I know, you can't embed a pdf into a webpage like you can with a swf.
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Hi,
As a quick example of how to implement this using a preallocated array and a graph instead of a chart, see the following snippet which implements two different behaviors of displaying the data.
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I have an interesting issue with logging a 'thermocouple disconnected' alarm as part of a condition monitoring application.
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Regards,
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Solved!
Go to Solution.egraham wrote:
One method still appears faster and I wonder why this faster method isn't the one we should be using???
Because your method is not the fastest.
Yes, I was sloppy in my code and there was an additional buffer allocation due to the autoindexing branch of the array. If we index inside the inner for loop, we eliminate that extra buffer allocation and speed it up by more than a factor of two. (I did the autoindex for quicker coding and cleaner diagram, because it does not really matter in your application).
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First, let's make sure we benchmark the right code. We don't do a single replacement as in your benchmark, but there is also an outer shift register where we keep the rotated array. You should also disable debugging, because loops have more debugging overhead, skewing the results.
Attached is a simple draft with 5 code alternatives. Just run and select one algorithm at a time via the enum selector. The time in ms will be graphed. (There are probably some bugs, please verify correct operation).
Loop In Place: Using a loop and the "in place element" structure to rotate rows down.
Loop Original: Using a loop and the proper inner indexing.
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Delete_Insert: Your code (delete last, insert new element at the beginning).
Insert_Delete: Basically same as (4) but with operations reversed.
Here are my results: algorithm incremeneted every 40 iterations)
(1) and (2) are fastest, (3) is slowest, and (4)&(5) are somewhere in the middle, or about half he speed of the first two.
Feel free to find a fster method for the same task. There problaby is......
Also note that the real case has a 2D array of strings, so things might again be slighly different (not tested).
Just some food for thought....
LabVIEW Champion . Do more with less code and in less time .
Attachments:
shift array elements_compare5Algorithm.vi 22 KB
ShiftArrayBenchmark.PNG 18 KB -
Load SVGZ Files in JavaFx2.0 and rasterize them
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http://stackoverflow.com/questions/6854601/load-svg-file-in-javafx-2-0
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The code I put in here is experimental and in Scala (sorry, but I thing it is also read-able for Java dudes) and handles only a few SVG nodes. Batik is used to read it. It works (JavaFX 2.0 b42), but is definetly not very nice. Maybe that helps anyway :
package org.rob.svgtransform
import javafx.event.{Event, EventHandler}
import org.w3c.dom.{NamedNodeMap, NodeList, Document}
import javafx.scene.paint._
import javafx.scene.text.Text
import javafx.scene.image.{ImageView, Image}
import javafx.scene.shape._
import java.awt.image.RenderedImage
import org.apache.batik.ext.awt.image.codec.png.PNGDecodeParam
import org.apache.batik.ext.awt.image.codec.png.PNGImageDecoder
import javax.imageio.ImageIO
import org.apache.batik.ext.awt.image.codec.png.PNGImageEncoder
import org.apache.batik.ext.awt.image.codec.png.PNGEncodeParam
import collection.mutable.ListBuffer
import javafx.application.Application
import javafx.stage.Stage
import javafx.scene.{Scene, Node, Group}
import org.apache.batik.util.{XMLResourceDescriptor, ParsedURL}
import org.apache.batik.dom.svg._
import java.io._
trait FxEventHandler extends EventHandler[Event] {
def setSvgToFx(sf : ISVGToFX)
trait ISVGToFX {
def getRootNode : Group
def getFxElementBySvgId(svgId : String) : Option[Node]
def getSvgIdByFxElement(fxElement : Any) : Option[String]
def getImageStrByImageId(imageId : String) : Option[String]
def getSvgElementBySvgId(svgId : String) : Option[SVGOMElement]
class SVGToFX(svgDocument : Document) extends ISVGToFX {
var eventHandler : FxEventHandler = null
var fxElementToSvgIdMap = Map.empty[Any, String]
var svgIdToFxElementMap = Map.empty[String, Any]
var imageIdToImageStrMap = Map.empty[String, String]
var svgIdToSvgElementMap = Map.empty[String, SVGOMElement]
var eventHandlerNodes = Set.empty[Node]
val rootElement = toFx(null, svgDocument)
def setEventHandler(eventHandler : FxEventHandler) {
this.eventHandler = eventHandler
for(eventHandlerNode <- eventHandlerNodes)
eventHandlerNode.setOnMouseClicked(eventHandler)
eventHandler.setSvgToFx(this)
def getSvgIdByFxElement(fxElement : Any) : Option[String] = fxElementToSvgIdMap.get(fxElement)
def getFxElementBySvgId(svgId : String) : Option[Node] = svgIdToFxElementMap.get(svgId) match {
case Some(el) => {
if(el.isInstanceOf[Node])
Option(el.asInstanceOf[Node])
else
None
case None => None
def getImageStrByImageId(imageId : String) : Option[String] = imageIdToImageStrMap.get(imageId)
def getSvgElementBySvgId(svgId : String) : Option[SVGOMElement] = svgIdToSvgElementMap.get(svgId)
def getRootNode : Group = rootElement.asInstanceOf[Group]
protected def traverse(nl: NodeList, level: Int): Unit = {
for (i <- 0 until nl.getLength)
val n = nl.item(i)
if(n.isInstanceOf[SVGOMElement]){
val svgElem = n.asInstanceOf[SVGOMElement]
val id = svgElem.getId
val attr : NamedNodeMap = svgElem.getAttributes
val range = 0.until(attr.getLength)
val sp = space(level)
println(sp + "-----------------------------")
println(sp + "class = " + svgElem.getClass.getName)
for(k <- range){
val node = attr.item(k)
println(sp + "name = " + node.getNodeName + "; value = " + node.getNodeValue)
println(sp + "BPMNDItoSVG: ID = " + id)
println(sp + "-----------------------------")
traverse(n.getChildNodes, level + 1)
protected def space(level : Int) : String = {
var sb = new StringBuffer("")
for(x <- 0 to level)
sb = sb.append(" ")
sb.toString
var noIdCounter : Int = 0
protected def toFx(parentId : String, obj : Any): Any = {
def doGroup(svgId: String, nl: NodeList, g : Group){
for (i <- 0 until nl.getLength){
val el = toFx(svgId, nl.item(i))
if(el != null){
el match {
// case i : ImageView => refToImageMap = refToImageMap + (svgId -> i)
case n : Node => {
if(svgId != null && !"".equals(svgId ) && !fxElementToSvgIdMap.contains(n))
fxElementToSvgIdMap = fxElementToSvgIdMap + (n -> svgId)
g.getChildren.add(n)
def getId(id : String) : String = {
id match {
case id : String => id
case _ => {
noIdCounter = noIdCounter + 1
"noid_" + noIdCounter
def getAttribute(attrs : NamedNodeMap, attr : String) : String = {
val range = 0.until(attrs.getLength)
for(k <- range){
val node = attrs.item(k)
if(attr.equals(node.getNodeName))
return node.getNodeValue
//println("name = " + node.getNodeName + "; value = " + node.getNodeValue)
null
var returnValue : Any = null
val svgId : String = obj match {
case e : SVGOMElement => {
val svgEl = obj.asInstanceOf[SVGOMElement]
getId(svgEl.getId)
case _ => null
obj match {
case e : Document => {
returnValue = new Group
doGroup(svgId, e.getChildNodes, returnValue.asInstanceOf[Group])
svgIdToFxElementMap = svgIdToFxElementMap + ("root" -> returnValue)
case e : SVGOMDefsElement => {
val nl = e.getChildNodes
for (i <- 0 until nl.getLength)
toFx(svgId, nl.item(i)) // ending up in fxElementMap because they only will be referenced and are not used directly
case e : SVGOMLinearGradientElement => {
val stopList = new java.util.ArrayList[Stop]()
val nl = e.getChildNodes
for (i <- 0 until nl.getLength){
val el = toFx(svgId, nl.item(i))
el match {
case st : Stop => stopList.add(st)
case _ =>
val attr = e.getAttributes
val startXStr = getAttribute(attr, "x1")
val startYStr = getAttribute(attr, "y1")
val stopXStr = getAttribute(attr, "x2")
val stopYStr = getAttribute(attr, "y2")
val startX = strToValue(startXStr).asInstanceOf[Double]
val startY = strToValue(startYStr).asInstanceOf[Double]
val stopX = strToValue(stopXStr).asInstanceOf[Double]
val stopY = strToValue(stopYStr).asInstanceOf[Double]
returnValue = new LinearGradient(startX,startY,stopX,stopY,false,CycleMethod.NO_CYCLE, stopList.asInstanceOf[java.util.List[Stop]])
returnValue = new LinearGradient(0,0,0,1,true,CycleMethod.NO_CYCLE, stopList.asInstanceOf[java.util.List[Stop]])
case e : SVGOMStopElement => {
val attr = e.getAttributes
val colorStr = getAttribute(attr, "style")
val offsetStr = getAttribute(attr, "offset")
val color = strToValue(colorStr).asInstanceOf[String]
var offset = strToValue(offsetStr).asInstanceOf[Double]
if(offset > 1.0)
offset = 1.0
returnValue = new Stop(offset, Color.web(color))
case e : SVGOMImageElement => {
val attr = e.getAttributes
val imageDataStr = getAttribute(attr, "xlink:href")
val widthStr = getAttribute(attr, "width")
val heightStr = getAttribute(attr, "height")
if(parentId != null)
imageIdToImageStrMap = imageIdToImageStrMap + (parentId -> imageDataStr)
case e : SVGOMEllipseElement => {
val attr = e.getAttributes
val transformStr = getAttribute(attr, "transform")
val fillStr = getAttribute(attr, "fill")
val rxStr = getAttribute(attr, "rx")
val cxStr = getAttribute(attr, "cx")
val ryStr = getAttribute(attr, "ry")
val cyStr = getAttribute(attr, "cy")
val strokeStr = getAttribute(attr, "stroke")
val strokeWidthStr = getAttribute(attr, "stroke-width")
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val cx = strToValue(cxStr).asInstanceOf[Double]
val ry = strToValue(ryStr).asInstanceOf[Double]
val cy = strToValue(cyStr).asInstanceOf[Double]
val ellipse = new Ellipse(cx, cy, rx, ry)
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case p : Paint => ellipse.setFill(p)
case _ =>
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if(eventHandler != null)
ellipse.setOnMouseClicked(eventHandler)
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val xStr = getAttribute(attr, "x")
val fontSizeStr = getAttribute(attr, "font-size")
val yStr = getAttribute(attr, "y")
val fillStr = getAttribute(attr, "fill")
val textAnchorStr = getAttribute(attr, "text-anchor")
val fontDecorationStr = getAttribute(attr, "font-decoration")
val fontFamilyStr = getAttribute(attr, "font-family")
val fontWeightStr = getAttribute(attr, "font-weight")
val x = strToValue(xStr).asInstanceOf[Double]
val y = strToValue(yStr).asInstanceOf[Double]
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// t.setTextAlignment(TextAlignment.LEFT)
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val attr = e.getAttributes
val xStr = getAttribute(attr, "x")
val yStr = getAttribute(attr, "y")
val transformStr = getAttribute(attr, "transform")
val fillStr = getAttribute(attr, "fill")
val widthStr = getAttribute(attr, "width")
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val ryStr = getAttribute(attr, "ry")
val heightStr = getAttribute(attr, "height")
val strokeStr = getAttribute(attr, "stroke")
val strokeWidthStr = getAttribute(attr, "stroke-width")
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val y = strToValue(yStr).asInstanceOf[Double]
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val width = strToValue(widthStr).asInstanceOf[Double]
val height = strToValue(heightStr).asInstanceOf[Double]
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rect.setArcWidth(rx)
rect.setStroke(Color.GRAY)
rect.setStrokeWidth(strokeWidth)
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case p : Paint => rect.setFill(p)
case _ =>
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val attr = e.getAttributes
val xStr = getAttribute(attr, "x")
val yStr = getAttribute(attr, "y")
val widthStr = getAttribute(attr, "width")
val heightStr = getAttribute(attr, "height")
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val y = strToValue(yStr).asInstanceOf[Double]
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val height = strToValue(heightStr).asInstanceOf[Double]
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iv2.setFitWidth(width)
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val attr = e.getAttributes
val fillStr = getAttribute(attr, "fill")
val strokeWidthStr = getAttribute(attr, "stroke-width")
val pathStr = getAttribute(attr, "d")
val transformStr = getAttribute(attr, "transform")
val strokeStr = getAttribute(attr, "stroke")
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case p : Paint => svgPath.setFill(p)
case _ =>
svgPath.setStrokeWidth(strokeWidth)
svgPath.setContent(pathStr)
svgPath.setStroke(Color.BLACK)
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val attr = e.getAttributes
val fillStr = getAttribute(attr, "fill")
val strokeWidthStr = getAttribute(attr, "stroke-width")
val pointsStr = getAttribute(attr, "points")
val strokeStr = getAttribute(attr, "stroke")
val transformStr = getAttribute(attr, "transform")
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case _ =>
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val attr = e.getAttributes
val fillStr = getAttribute(attr, "fill")
val strokeWidthStr = getAttribute(attr, "stroke-width")
val strokeStr = getAttribute(attr, "stroke")
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val cx = strToValue(cxStr).asInstanceOf[Double]
val cy = strToValue(cyStr).asInstanceOf[Double]
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circle.setCenterY(cy);
circle.setRadius(r);
circle.setStroke(Color.BLACK)
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eventHandlerNodes = eventHandlerNodes + circle
returnValue = circle
case e : SVGOMSVGElement => {
val attr = e.getAttributes
val transformStr = getAttribute(attr, "transform")
val g = new Group
doGroup(svgId, e.getChildNodes, g)
setTransforms(g, transformStr)
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case e : SVGOMGElement => {
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val transformStr = getAttribute(attr, "transform")
val g = new Group
doGroup(svgId, e.getChildNodes, g)
setTransforms(g, transformStr)
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if(obj != null && obj.isInstanceOf[SVGOMElement])
svgIdToSvgElementMap = svgIdToSvgElementMap + (svgId -> obj.asInstanceOf[SVGOMElement])
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var translate : Array[Double] = null
var rotate : Array[Double] = null
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val translateIdx = transformStr.indexOf("translate(")
val rotateIdx = transformStr.indexOf("rotate(")
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val pngen = new PNGImageEncoder(baos, new PNGEncodeParam.Palette)
pngen.encode(awti)
val bais = new ByteArrayInputStream(baos.toByteArray)
returnValue = new Image(bais)
} else
returnValue = null
} else if(str.startsWith("points:")){
returnValue = listToDoubleArray(str.substring(7))
} else if(str.startsWith("#")){
returnValue = str.substring(1)
} else if(str.startsWith("url(#")){
val endIdx = str.indexOf(")")
returnValue = str.substring(5,endIdx)
} else if(str.startsWith("stop-color:")){
returnValue = str.substring(11)
} else {
returnValue = str.toDouble
returnValue
def listToDoubleArray(listStr : String) : Array[Double] = {
val seperators = Array[Char](' ', ',', ')')
val ps = listStr.split(seperators)
val lb = new ListBuffer[Double]()
for(v <- ps)
lb += strToValue(v).asInstanceOf[Double]
lb.toArray
trait SVGElement{
val svgId : String
object SVGToFXTest {
def main(args : Array[String]){
Application.launch(classOf[SVGToFXTest], args)
class SVGToFXTest extends Application {
def start(st : Stage) {
st.setWidth(1000)
st.setHeight(800)
st.setTitle("SVGToFX");
st.setResizable(true);
val root = new Group
val scene = new Scene(root)
st.setScene(scene)
val fr = new FileReader("D:\\Development\\Playground\\SvgTransform\\data\\Test2.svg")
val parser: String = XMLResourceDescriptor.getXMLParserClassName
val fa: SAXSVGDocumentFactory = new SAXSVGDocumentFactory(parser)
val doc = fa.createDocument(SVGDOMImplementation.SVG_NAMESPACE_URI, fr).asInstanceOf[SVGOMDocument]
val svgToFx = new SVGToFX(doc)
root.getChildren.add(svgToFx.getRootNode)
println("Test")
st.setVisible(true)
}Edited by: user6782617 on 07.10.2011 04:56 -
Hello all,
I have a code that is tracing data from a Optical Spectrum Analyzer when certain conditions are met. (fft.VI) The data collected is a reflectance spectrum of a sensor.State 3 is the state that is collecting the data.
I want to make some data processing on the collected data. I attached a sample data set that is obtained by the code.
What I want is converting the power array from dbm scale to mW scale (I have done that), filtering the data with a bandpass filter (the expected frequency of the array starts from 100e-6 and goes up to 200e-6), normalizing data and finding the frequency of the spectrum. I found the necessary VIs and wired everthing but it gave some meaningless results.
Why do you think is wrong in the code? (the expected frequency should be around 130e-6 but according to the code it is 9.645)
Thank you
Attachments:
code_saturday.zip 195 KB
data set.xls 162 KBLooks like you just started out, because there are some very strange constructs that either make little sense or are done way too complicated.
( e.g. FFT.vi: State 1: The while loop consumes all CPU doing practically nothing. It needs a small wait. ["collect data?"_AND_ "true"] is the same as ["collect data?"]. You can delete the "boolean AND" and the TRUE diagram constant, they make no difference. State 3: don't operate on entire paths as strings, because you will break platform independence. Use path constants and "build path" and operate only on filenames as strings. You should create some data dependency to ensure that resetting the history data occurs before the loops start. Why is the number of elements a hidden control that is zero instead of 30? Use a diagram constant! The subVI "get last 30 elements could be done with a simple "rotate array" and "replace array element", all that code is way too complicated. etc. etc....)
First of all, whe you attach multiple VIs, please tell us what the name of the toplevel VI is to make our life easier. It's not obvious at first.
Back to your original question. You are feeding a plain 1D array to the FFT, so there is no dt information, this also means that the df of the transform will need to be calculated based on the correct dt that you need to obtain from elsewhere. Once you have df, you can set the x-axis of the transform accordingly (xo, dx). (more information)
LabVIEW Champion . Do more with less code and in less time . -
Hi !
I found quite a few topics about putting flash into pdf, but
my problem is that I want to embed PDF content inside a flash
application. My desires would be to embed 3D acrobat data, even
without acrobat frame/viewer into a flash app. I don't even dream
about such a thing possible in flash, but if there's everything
half as great, I would really appreciate if somebody would let me
know.
Thank you,
SubDisplaying a 3D viewport via Flash Player is not going to happen yet. Although FP10 is promoted as having "3D features" it's strictly a 2.5D kernel - there's no internal concept of Z-space, just perspective and rotation arrays to make it look like there is. Dropping a U3D or OBJ into a Flash timeline would be nice, but you'll have to wait.
Meanwhile, Acrobat 9 can do it perfectly happily, and R9 penetration is quite good - not as deep as FP, but it's a different demographic. People who use the Web for CAD-type business will almost certainly have it, but a kid surfing for games may not. It's also extremely simple to handle legacy visitors to a page with embedded 3D PDF content; we've been doing it since 8.5 launched and our server logs currently run at around 65% having R9 on arrival, and 15% installing it and coming back.
There are other 3D browser plugins and OS applets such as Right Hemisphere's Deep View, but in general visitors get the point of installing R9 as they've heard of Adobe. Pushing them to another install, however good and safe it may be, is far harder if they don't recognize the name. You also have the advantage that it's a lot more work to drag your original model out from a PDF, whereas some of the third-party viewers simply push the raw mesh file to the visitor. -
How to generate a PN sequence in LABVIEW. PN pseudorandom sequence generates a sequence of pseudorandom
binary numbers. A pseudonoise sequence can be used in a pseudorandom
scrambler and descrambler. It can also be used in
spread-spectrum system.PRNGs (aka PRBS) are usually based on Linear Feedback Shift Registers (LFSRs) so a search on LFSRs is a good idea to see the theory behind them.
One difference with LFSRs and the LabVIEW "dice" (which does output pseudorandom numbers) is that LFSRs can't output an all zero state. A seed value is used to start the sequence (and this can't be all zeros either).
Here is an 8 bit LSFR:
Note that the rotate array function is only there for aesthetic purposes.
The same output will always be returned for a given seed value and iteration count of the For loop.
steve
Help the forum when you get help. Click the "Solution?" icon on the reply that answers your
question. Give "Kudos" to replies that help. -
Convert the output sequence of complex FFT
I am using complex FFT to do IQ demodulation.
the input X of complex FFT is cos(x)+i*sin(x). abs(FFT(X)) is the frequency response of input X. I need to convert the output sequence the format
FROM: DC f....Nyquist Frequency...–f
TO: -Fre_nyquist ...DC... Fre_nyquist
Is there any function I can use to do this convertion? thanksJust use "rotate array" from the array palette (LabVIEW 7.1 or lower) and rotate by n/2.
If you have LabVIEW 8.0, simply wire a TRUE to the "shift?" input for a DC centered spectrum.
LabVIEW Champion . Do more with less code and in less time . -
Is there a way to rotate an array on the front panel?
Is there a way to rotate an array on the front panel? For example, I want element [0] to be at the bottom of an array that's expanded to show the elements vertically.
Thanks in advance.I do not think that there is any way to make an array control or indicator display that way.
You might be able to reverse the array, creating an upside down display. If you also need the user to index it, then it gets trickier. Hide the array index display. Create another numeric control to look like the index control. When the value of the new control is changed, subtract the value from the last index of the array and use the difference to index the array. You may need to adjust by +/-1, so try it to be sure.
Lynn -
Rotation animation using an array
Hi, I'm fairly new to using java and I've been trying to figure out a couple of things but I just can't find what im looking for by searching. The IDE i'm using is BlueJ and any help would be appreciated.
1. Take an array of N images (no X or Y movement) and get it to track the mouse so that as the mouse moves in a circle around the image the imageIndex changes so that the current image is facing the mouse
2. Setting up keybindings so that an array of images will "rotate" the same way as in number 1Add a MouseMotionListener.
Determine the position of the cursor relative to your image.
Determine the image that's to be shown.
Draw it. -
I Need an Array of Rotated String Indicators
Greetings,
I need to make an array containing verticle strings. The size of the array will very during runtime.
I know that for a single string indicator I can ignore the actual control, rotate the caption and change its text property and for a cluster there's an array of references to each member which can be used for accessing the caption text of each member but it appears that all members of an array share a caption.
Am I correct that there's no way (yet) to do that?
Peace
phroggieHello Phrog,
It seems like the solution proposed by Paul is sufficient for your application. But I would like to suggest an alternative solution (with its own trade offs) that may address some of your functionality concerns. The width of a string indicator and text wrapping can both be set in the properties menu. Because of these settings, each character would appear vertically stacked. An array of these string indicators could be sized dynamically and viewed using a scroll bar. Unfortunately the letter “m” is wider than combinations of other two letters such as “is”. If the width is set too low then the letter “m” gets cutoff. If the width is set too high then smaller letters like “is” appear on the same line. There is no magic width that prevents these two cases.
The example I have attached works around the letter “m” by appending a space between each non-m character and uses an indicator width of 23 pixels. This is enough space to display the letter “m” while the inserted spaces prevent smaller letters from appearing on the same line. Despite this inconvenience, you gain the use of built in dynamic array sizing and the horizontal scroll bar.
Otherwise, scroll bar functionality is not built into clusters. It is possible to implement a scroll bar for a cluster programmatically as shown in this community example: https://decibel.ni.com/content/docs/DOC-35704
This solution isn't necessarily easy to implement, so using stacked characters in an array may be a worthwhile trade off depending on your application.
Earl C
Applications Engineer
National Instruments
Attachments:
Vertical Strings.vi 14 KB -
Get rectangular array after Image rotated
I want to extract underlying data from a rectangle drawn on an image after it has been rotated.
The rectangle has been drawn with a mouse, and the mouse points are inverse-transformed
into original data coordinates.
The problem is the same as extracting data from a rectangular array that is not oriented on either
side along the coordinates (indices) of the original data.
I could apply an affine transform to the entire image and get the data that way, but the images
are quite large and I prefer to extract only the data I need.
Has anybody done this?I'm unclear what you're trying to do, but whenever I need precise rotations translated fast, I used the affineTransform.transform(float[] src,int offset,float[] dst,int offset2) method.
And if you need the inverse transformation, just say:
AffineTransform inverted = originalTransform.createInverse();
That will get you just the points, without messing with shapes or PathIterators or anything else. -
Pointer Manipulation: Wrap Around/Rollover/Rotation of LabVIEW Arrays and Waveforms???
I know we can't use pointers in LabVIEW, but I was wondering if there's any way we can do wrap-around [or "rollover," or "rotation"] of Array [or Waveform] values without having to make copies of the Array [or Waveform]?
For instance, suppose I'm reading one second's worth of data into a five second buffer. After the first five seconds, I've got
1st (1/5)th: 1st second's worth of data
2nd (1/5)th: 2nd second's worth of data
3rd (1/5)th: 3rd second's worth of data
4th (1/5)th: 4th second's worth of data
5th (1/5)th: 5th second's worth of data
Now I read the sixth second's worth of data, and overwrite the [original] first second, so that I have
1st (1/5)th: 6th second's worth of data
2nd (1/5)th: 2nd second's worth of data
3rd (1/5)th: 3rd second's worth of data
4th (1/5)th: 4th second's worth of data
5th (1/5)th: 5th second's worth of data
and in C, or C++, I'd just move the pointer up to the second (1/5)th of data, and start from there.
The LabVIEW Complex FFT is another place where this would be really useful. The Help File for the Complex FFT is in
Help | VI and Function Reference | Analyze VIs | Signal Processing VIs | Frequency Domain VIs | Complex FFT.
If you read the Help File, you see that LabVIEW returns an FFT with values in the range
[0, 2n - 1)
rather than the standard
[-n, n - 1)
i.e. LabVIEW takes the negative frequencies and tacks them on at the end, after the positive frequencies.
I'd like to be able to view my FFTs with the negative frequencies where they're supposed to be [i.e to the left of zero], and this would be SO easy if I could just move the underlying data pointer of the Waveform forward to the halfway point.
But, of course, in LabVIEW, I don't have pointers, so I was wondering: Are there any built-in VIs for Array [or Waveform] manipulation that will perform this sort of wrap-around [or "rollover," or "rotation"] of the data? If so, I couldn't find them. Ideally, such a VI would have two inputs: {old Array, new starting point}, and one output: {new Array}. Similarly with Waveforms, only you'd need to manipulate t0 as well.
Or do I have to copy the entire data set to a new Array [or Waveform] each time I reach the end of the buffer?
Thanks!> Ideally, such a VI would have two inputs: {old Array, new starting point}, and one output: {new Array}.
Have a look at "rotate 1D array" in the array palette (second row, fourth column).
(Sorry, I dont use waveform data).
LabVIEW Champion . Do more with less code and in less time .
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