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  • examples of good concurrent programs meant to scale

    - by vishr
    I am looking for seminal and excellent examples of libraries and projects that emulate the good practices of the Java Concurrency in Practice book. The book is marvelous. However, I think supplementing this book reading with code reviews of projects and libraries that make use of the concurrency APIs effectively is necessary to drive the concepts into the brain. One good example of what I am looking for is https://code.google.com/p/concurrentlinkedhashmap/ Can folks help me with finding exemplary, well written code that use the concurrency api well?

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  • How can I create tiles that scale to multiple resolutions?

    - by Darestium
    I am trying to create a multiplayer version of the popular Flash game N in Java. However, I'm not sure how to create a tileset that will scale up. Are the tiles for N pre-drawn or are they defined with mathamatical formulas in code? I do see how they would scale up in Flash if they were pre-rendered. So if anyone has any ideas how I should go about creating the tileset, or how they are created in the game please let me know. You can check out the game here.

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  • UIScrollView issue with autorotation and content scaling

    - by boliva
    Hi, I'm building a new (autorotating) iPad app that consists mainly of a screen sized UIScrollView that contains an UIImageView for an image which is 5 times the iPad screen resolution while in portrait mode (3840x1024). What I haven't been able to accomplish is that whenever the device rotates (to whichever orientation) the imageView bounds and the scrollView contentSize asjusts the image for the new height (maintaining its aspect ratio), making the height of the image to always fit the device height for the given orientation (so in the particular case of this image, it would get shown as 2880x768). I tried different combinations of autoresizingMask and contentMode for the imageView but the closer I've been able to get is to effectively display the image at the desired size but with a white padding around it and into the scrollView content (to make up for the original orientation contentSize). I also tried recalculating the scrollView contentSize in the didRotate.../viewWillAnimate... rotation-related methods in my viewController class, with no avail. Best regards and thanks for your time

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  • Android: ImageView scales up source image

    - by legr3c
    I can't seem to get my ImageView to display its source image in its original size. The ImageView looks like this: <ImageView android:id="@+id/Logo" android:src="@drawable/logo" android:layout_width="wrap_content" android:layout_height="wrap_content" > </ImageView> The source image is 140 pixels wide, yet on the Nexus One's screen, which is 480 pixels wide it uses up half of the width. Using absolute values in px or dp for the width and height changes nothing. The image also looks very antialiased from the upscaling. Why is this happening and how can I prevent it?

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  • How to make an Android UI with images from a designer delivered as layers

    - by Not Me
    I hired a designer to help me redesign the UI for my Android app. For each Activity he gave me an image for the background, which includes any static content like fancy frames for text content; plus images for the buttons, which must fit in to the background image in exact places, to fit into the frames in the background image. However, since Android devices have different screen sizes and aspect ratios, it's easy to fit the background image by itself with android:scaleType="centerInside", but how can I get all the other images to fit in with background exactly, to the pixel? If they didn't have to fit in with the background, I would just set the exact width and height for each ImageButton, but depending on how the background scales (based on the screen size and ratio) they might end up not aligned correctly. Thank you very much in advance.

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  • ActionScript applying rotation of sprite to startDrag()'s rectangle bounds

    - by TheDarkIn1978
    i've added a square sprite to the stage which, when dragged, is contained within set boundaries. private function swatchBounds():Rectangle { var stageBounds = new Rectangle ( 0 - defaultSwatchRect.x, 0 - defaultSwatchRect.y, stage.stageWidth - defaultSwatchRect.width, stage.stageHeight - defaultSwatchRect.height ); return stageBounds; } if the square sprite is scaled, the following returned rectangle boundary works private function swatchBounds():Rectangle { var stageBounds = new Rectangle ( 0 - defaultSwatchRect.x * swatchObject.scaleX, 0 - defaultSwatchRect.y * swatchObject.scaleY, stage.stageWidth - defaultSwatchRect.width * swatchObject.scaleX, stage.stageHeight - defaultSwatchRect.height * swatchObject.scaleY ); return stageBounds; } now i'm trying to include the square sprites rotation into the mix. math certainly isn't my forté, but i feel i'm on the write track. however, i just can't seem to wrap my head around it to get it right private function swatchBounds():Rectangle { var stageBounds = new Rectangle ( 0 - defaultSwatchRect.x * swatchObject.scaleX * Math.cos(defaultSwatchRect.x * swatchObject.rotation), 0 - defaultSwatchRect.y * swatchObject.scaleY * Math.sin(defaultSwatchRect.y * swatchObject.rotation), stage.stageWidth - defaultSwatchRect.width * swatchObject.scaleX * Math.cos(defaultSwatchRect.width * swatchObject.rotation), stage.stageHeight - defaultSwatchRect.height * swatchObject.scaleY * Math.sin(defaultSwatchRect.height * swatchObject.rotation) ); return stageBounds; }

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  • Scaled live iPhone Camera view in center, "CGAffineTransformTranslate" not working

    - by Gavin
    Hi, I have a little problem which I could not solve. I really hope someone can help me with that. I wanted to resize the live camera view and place it in the center, using the following code below: picker.cameraViewTransform = CGAffineTransformScale(picker.cameraViewTransform, 0.5, 0.56206); picker.cameraViewTransform = CGAffineTransformTranslate(picker.cameraViewTransform, 80, 120); But all I got was a scaled 1/2 sized view on the top left of the screen. It seems as though "CGAffineTransformTranslate" does nothing at all. The translation didn't work even when I used: picker.cameraViewTransform = CGAffineTransformMake(1, 0, 0, 1, 80, 120); The translation portion seems to have no effect on the live camera view. Hope someone can enlighten me. Thanks.

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  • Openfire scalability question XMPP Server

    - by candoyo
    Hello! Do you guys know how well openfire scales? My users will be using the application to do normal chatting like msn no file transfer for now. We will be using Amazon's EC2 server to run the chat server we would like to support over 1 Million users in total and around 30-50K active users during peak times. Since clustering is now opensource, I though Openfire might be the way to go, how much will it cost for the coherence license or can I bipass that somehow? Also, I wanted to develop plugin for Openfire if we go with it. Any pointers on how to set up a dev env and get going would be helpful too! Thanks ya'all! :)

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  • Smooth mousover images inside scaled Flex App?

    - by Josh Handel
    I have a flex app I am scaling using systemManager.stage.scaleMode=StageScaleMode.NO_BORDER; for the most part it works well except for my bitmap data (mostly png's from the designers). I can set the mx:image tags to smoothBitmapContent=true and that works great for everything except my mouseover objects. When I do a mouseover, the source is being changed from one embedded image to another embedded image. I have tried several (many) online "smoothimage" classes, and tried to write my own, I have tried to reset smoothBitmapContent every chance I get but still no dice. It seems to mee that because I am scaling at the app level, that the flopped out bitmap is not getting smoothed when it renders. Does anyone have any suggestions on how to keep things smooth (perhaps there is a flag to tell Flex to smooth stuff when it scales it?). Thanks Josh

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  • Scaling an image using the mouse in C#

    - by Gaax
    Hey guys... I'm trying to use the position of the mouse to calculate the scaling factor for scaling an image. Basically, the further you get away from the center of the image, the bigger it gets; and the closer to the center you get, the smaller it gets. I have some code so far but it's acting really strange and I have absolutely no more ideas. First I'll let you know, one thing I was trying to do is average out 5 distances to get a more smooth resize animation. Here's my code: private void pictureBoxScale_MouseMove(object sender, MouseEventArgs e) { if (rotateScaleMode && isDraggingToScale) { // For Scaling int sourceWidth = pictureBox1.Image.Width; int sourceHeight = pictureBox1.Image.Height; float dCurrCent = 0; // distance between the current mouse pos and the center of the image float dPrevCent = 0; // distance between the previous mouse pos and the center of the image System.Drawing.Point imgCenter = new System.Drawing.Point(); imgCenter.X = pictureBox1.Location.X + (sourceWidth / 2); imgCenter.Y = pictureBox1.Location.Y + (sourceHeight / 2); // Calculating the distance between the current mouse location and the center of the image dCurrCent = (float)Math.Sqrt(Math.Pow(e.X - imgCenter.X, 2) + Math.Pow(e.Y - imgCenter.Y, 2)); // Calculating the distance between the previous mouse location and the center of the image dPrevCent = (float)Math.Sqrt(Math.Pow(prevMouseLoc.X - imgCenter.X, 2) + Math.Pow(prevMouseLoc.Y - imgCenter.Y, 2)); if (smoothScaleCount < 5) { dCurrCentSmooth[smoothScaleCount] = dCurrCent; dPrevCentSmooth[smoothScaleCount] = dPrevCent; } if (smoothScaleCount == 4) { float currCentSum = 0; float prevCentSum = 0; for (int i = 0; i < 4; i++) { currCentSum += dCurrCentSmooth[i]; } for (int i = 0; i < 4; i++) { prevCentSum += dPrevCentSmooth[i]; } float scaleAvg = (currCentSum / 5) / (prevCentSum / 5); int destWidth = (int)(sourceWidth * scaleAvg); int destHeight = (int)(sourceHeight * scaleAvg); // If statement is for limiting the size of the image if (destWidth > (currentRotatedImage.Width / 2) && destWidth < (currentRotatedImage.Width * 3) && destHeight > (currentRotatedImage.Height / 2) && destWidth < (currentRotatedImage.Width * 3)) { AForge.Imaging.Filters.ResizeBilinear resizeFilter = new AForge.Imaging.Filters.ResizeBilinear(destWidth, destHeight); pictureBox1.Image = resizeFilter.Apply((Bitmap)currentRotatedImage); pictureBox1.Size = pictureBox1.Image.Size; pictureBox1.Refresh(); } smoothScaleCount = -1; } prevMouseLoc = e.Location; currentScaledImage = pictureBox1.Image; smoothScaleCount++; } }

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  • J2ME Reduce Image color-depth/ Compress Image size

    - by updateraj
    Hi, I need to transmit the image from the mobile phone to the server. I am able to reduce the image screen size but not the memory size. I understand i have to deal with the color depth. J2ME does not seem to offer any scaling method which is available in J2SE: image rescaled = image.getScaledInstance(thumbWidth, thumbHeight, Image.SCALE_AREA_AVERAGING); BufferedImage biRescaled = toBufferedImage(rescaled, thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB); How i would i tackle this ? I would like to reduce the image memory size before i transmit to the server. Thank you

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  • How come this image won't resize to fit the sprite?

    - by George Edison
    I have this snippet of ActionScript code that is supposed to resize an image to fit the sprite: package { import flash.display.Sprite; import flash.display.Bitmap; import flash.events.Event; public class Main extends Sprite { [Embed(source = 'img.png')] private var TheImage:Class; public static const TheImageWidth:Number = 1300; public static const TheImageHeight:Number = 1300; public function Main():void { if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE, init); } private function init(e:Event = null):void { removeEventListener(Event.ADDED_TO_STAGE, init); // entry point var image:Bitmap = new TheImage(); addChild(image); image.scaleX = width / TheImageWidth; image.scaleY = height / TheImageHeight; } } } Why isn't it working?

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  • Devision in c# not going the way i expect

    - by Younes
    Im trying to write something to get my images to show correctly. I have 2 numbers "breedtePlaatje" and "hoogtePlaatje". When i load those 2 vars with the values i get back "800" and "500" i expect "verH" to be (500 / 800) = 0,625. Tho the value of verH = 0.. This is the code: int breedtePlaatje = Convert.ToInt32(imagefield.Width); int hoogtePlaatje = Convert.ToInt32(imagefield.Height); //Uitgaan van breedte plaatje if (breedtePlaatje > hoogtePlaatje) { double verH = (hoogtePlaatje/breedtePlaatje); int vHeight = Convert.ToInt32(verH * 239); mOptsMedium.Height = vHeight; mOptsMedium.Width = 239; //Hij wordt te klein en je krijgt randen te zien, dus plaatje zelf instellen if (hoogtePlaatje < 179) { mOptsMedium.Height = 179; mOptsMedium.Width = 239; } } Any tips regarding my approach would be lovely aswell.

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  • Scaling an image using the mouse in a WinForms application?

    - by Gaax
    I'm trying to use the position of the mouse to calculate the scaling factor for scaling an image. Basically, the further you get away from the center of the image, the bigger it gets; and the closer to the center you get, the smaller it gets. I have some code so far but it's acting really strange and I have absolutely no more ideas. First I'll let you know, one thing I was trying to do is average out 5 distances to get a more smooth resize animation. Here's my code: private void pictureBoxScale_MouseMove(object sender, MouseEventArgs e) { if (rotateScaleMode && isDraggingToScale) { // For Scaling int sourceWidth = pictureBox1.Image.Width; int sourceHeight = pictureBox1.Image.Height; float dCurrCent = 0; // distance between the current mouse pos and the center of the image float dPrevCent = 0; // distance between the previous mouse pos and the center of the image System.Drawing.Point imgCenter = new System.Drawing.Point(); imgCenter.X = pictureBox1.Location.X + (sourceWidth / 2); imgCenter.Y = pictureBox1.Location.Y + (sourceHeight / 2); // Calculating the distance between the current mouse location and the center of the image dCurrCent = (float)Math.Sqrt(Math.Pow(e.X - imgCenter.X, 2) + Math.Pow(e.Y - imgCenter.Y, 2)); // Calculating the distance between the previous mouse location and the center of the image dPrevCent = (float)Math.Sqrt(Math.Pow(prevMouseLoc.X - imgCenter.X, 2) + Math.Pow(prevMouseLoc.Y - imgCenter.Y, 2)); if (smoothScaleCount < 5) { dCurrCentSmooth[smoothScaleCount] = dCurrCent; dPrevCentSmooth[smoothScaleCount] = dPrevCent; } if (smoothScaleCount == 4) { float currCentSum = 0; float prevCentSum = 0; for (int i = 0; i < 4; i++) { currCentSum += dCurrCentSmooth[i]; } for (int i = 0; i < 4; i++) { prevCentSum += dPrevCentSmooth[i]; } float scaleAvg = (currCentSum / 5) / (prevCentSum / 5); int destWidth = (int)(sourceWidth * scaleAvg); int destHeight = (int)(sourceHeight * scaleAvg); // If statement is for limiting the size of the image if (destWidth > (currentRotatedImage.Width / 2) && destWidth < (currentRotatedImage.Width * 3) && destHeight > (currentRotatedImage.Height / 2) && destWidth < (currentRotatedImage.Width * 3)) { AForge.Imaging.Filters.ResizeBilinear resizeFilter = new AForge.Imaging.Filters.ResizeBilinear(destWidth, destHeight); pictureBox1.Image = resizeFilter.Apply((Bitmap)currentRotatedImage); pictureBox1.Size = pictureBox1.Image.Size; pictureBox1.Refresh(); } smoothScaleCount = -1; } prevMouseLoc = e.Location; currentScaledImage = pictureBox1.Image; smoothScaleCount++; } }

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  • Set sprite width or height without scaling it's children

    - by Gabi Barrientos
    I am trying to dynamically change the width and height of a Sprite object, which is a container for other similar Sprite objects. The container object automatically changes it's size according to the size of it's children, but when I change the position of the children objects, the size of the container stays the same and it's children appear to be placed outside of the container. I tried to solve this problem by using something like this: if (container.width < (child.x + child.width)) { container.width = (child.x + child.width); } but when I use this code, the container object's children are scaled. Is there a way to change the container's size without scaling it's children?

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  • Why does FastCGI not work well with Ruby on Rails?

    - by Jian Lin
    It is said that FastCGI doesn't work well with Ruby on Rails deployment. Why is that? In previous experience, something either works quite well or it might be fundamentally wrong. So if FastCGI is a viable solution, why is it not reliable with RoR? Does FastCGI work well with most any language / frameworks?

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  • Isometric layer moving inside map

    - by gronzzz
    i'm created isometric map and now trying to limit layer moving. Main idea, that i have left bottom, right bottom, left top, right top points, that camera can not move outside, so player will not see map out of bounds. But i can not understand algorithm of how to do that. It's my layer scale/moving code. - (void)touchBegan:(UITouch *)touch withEvent:(UIEvent *)event { _isTouchBegin = YES; } - (void)touchMoved:(UITouch *)touch withEvent:(UIEvent *)event { NSArray *allTouches = [[event allTouches] allObjects]; UITouch *touchOne = [allTouches objectAtIndex:0]; CGPoint touchLocationOne = [touchOne locationInView: [touchOne view]]; CGPoint previousLocationOne = [touchOne previousLocationInView: [touchOne view]]; // Scaling if ([allTouches count] == 2) { _isDragging = NO; UITouch *touchTwo = [allTouches objectAtIndex:1]; CGPoint touchLocationTwo = [touchTwo locationInView: [touchTwo view]]; CGPoint previousLocationTwo = [touchTwo previousLocationInView: [touchTwo view]]; CGFloat currentDistance = sqrt( pow(touchLocationOne.x - touchLocationTwo.x, 2.0f) + pow(touchLocationOne.y - touchLocationTwo.y, 2.0f)); CGFloat previousDistance = sqrt( pow(previousLocationOne.x - previousLocationTwo.x, 2.0f) + pow(previousLocationOne.y - previousLocationTwo.y, 2.0f)); CGFloat distanceDelta = currentDistance - previousDistance; CGPoint pinchCenter = ccpMidpoint(touchLocationOne, touchLocationTwo); pinchCenter = [self convertToNodeSpace:pinchCenter]; CGFloat predictionScale = self.scale + (distanceDelta * PINCH_ZOOM_MULTIPLIER); if([self predictionScaleInBounds:predictionScale]) { [self scale:predictionScale scaleCenter:pinchCenter]; } } else { // Dragging _isDragging = YES; CGPoint previous = [[CCDirector sharedDirector] convertToGL:previousLocationOne]; CGPoint current = [[CCDirector sharedDirector] convertToGL:touchLocationOne]; CGPoint delta = ccpSub(current, previous); self.position = ccpAdd(self.position, delta); } } - (void)touchEnded:(UITouch *)touch withEvent:(UIEvent *)event { _isDragging = NO; _isTouchBegin = NO; // Check if i need to bounce _touchLoc = [touch locationInNode:self]; } #pragma mark - Update - (void)update:(CCTime)delta { CGPoint position = self.position; float scale = self.scale; static float friction = 0.92f; //0.96f; if(_isDragging && !_isScaleBounce) { _velocity = ccp((position.x - _lastPos.x)/2, (position.y - _lastPos.y)/2); _lastPos = position; } else { _velocity = ccp(_velocity.x * friction, _velocity.y *friction); position = ccpAdd(position, _velocity); self.position = position; } if (_isScaleBounce && !_isTouchBegin) { float min = fabsf(self.scale - MIN_SCALE); float max = fabsf(self.scale - MAX_SCALE); int dif = max > min ? 1 : -1; if ((scale > MAX_SCALE - SCALE_BOUNCE_AREA) || (scale < MIN_SCALE + SCALE_BOUNCE_AREA)) { CGFloat newSscale = scale + dif * (delta * friction); [self scale:newSscale scaleCenter:_touchLoc]; } else { _isScaleBounce = NO; } } }

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  • How can I make OpenGL textures scale without becoming blurry?

    - by adorablepuppy
    I'm using OpenGL through LWJGL. I have a 16x16 textured quad rendering at 16x16. When I change it's scale amount, the quad grows, then becomes blurrier as it gets larger. How can I make it scale without becoming blurry, like in Minecraft. Here is the code inside my RenderableEntity object: public void render(){ Color.white.bind(); this.spriteSheet.bind(); GL11.glBegin(GL11.GL_QUADS); GL11.glTexCoord2f(0,0); GL11.glVertex2f(this.x, this.y); GL11.glTexCoord2f(1,0); GL11.glVertex2f(getDrawingWidth(), this.y); GL11.glTexCoord2f(1,1); GL11.glVertex2f(getDrawingWidth(), getDrawingHeight()); GL11.glTexCoord2f(0,1); GL11.glVertex2f(this.x, getDrawingHeight()); GL11.glEnd(); } And here is code from my initGL method in my game class GL11.glEnable(GL11.GL_TEXTURE_2D); GL11.glClearColor(0.46f,0.46f,0.90f,1.0f); GL11.glViewport(0,0,width,height); GL11.glOrtho(0,width,height,0,1,-1); And here is the code that does the actual drawing public void start(){ initGL(800,600); init(); while(true){ GL11.glClear(GL11.GL_COLOR_BUFFER_BIT); for(int i=0;i<entities.size();i++){ ((RenderableEntity)entities.get(i)).render(); } Display.update(); Display.sync(100); if(Display.isCloseRequested()){ Display.destroy(); System.exit(0); } } }

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  • What should I do to scale out an high-traffic website?

    - by makerofthings7
    What Best Practices should be undertaken for a Website that needs to "scale out" to handle capacity? This is especially relevant now that people are considering the cloud, but may be missing out on the fundamentals. I'm interested in hearing about anything you consider a best practice from development-level tasks, to infrastructure, to management. Use your best judgement when posting multiple answers, since it may make sense to post them separately for voting purposes. (hint: you'll likely get more reputation points for many small answers than one large answer)

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