scaling | 易学教程

html5 canvas prevent linewidth scaling

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问题 If I draw a rectangle of say linewidth=2 and then scale it to double the size of the rectangle, I get a rectangle that has its border double the size of the initial linewidth. Is there a way to keep the linewidth to the perceived size of 2 or the original size. In short, I want to just scale the size of the rectangle but keep the linewidth visually of size 2. I tried setting the linewidth before and after the scale(2,2) command but the border width also increases. One option is to divide the

Kinect skeleton Scaling strange behaviour

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问题 I am trying to scale a skeleton to match to the sizes of another skeleton. My algoritm do the following: Find the distance between two joints of the origin skeleton and the destiny skeleton using phytagorean teorem divide this two distances to find a multiply factor. Multiply each joint by this factor. Here is my actual code: public static Skeleton ScaleToMatch(this Skeleton skToBeScaled, Skeleton skDestiny) { Joint newJoint = new Joint(); double distanciaOrigem = 0; double distanciaDestino =

Scale with CGAffineTransform and set the anchor

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If I understand correctly scaling a UIView with CGAffineTransform anchors the transformation to its center. In particular: self.frame = CGRectMake(0,0,100,100); self.transform = CGAffineTransformMakeScale(2, 2); NSLog(@"%f;%f;%f;%f", self.frame.origin.x, self.frame.origin.y, self.frame.size.width, self.frame.size.height); Prints: -50;-50;200;200 How do you create a CGAffineTransform scale that uses a specific anchor point (say 0;0)? (a) Scale and then translate? Something like : CGAffineTransform t = CGAffineTransformMakeScale(2, 2); t = CGAffineTransformTranslate(t, width/2, height/2); self

CSS scale down image to fit in containing div, without specifing original size

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I want to have a website where I can upload images of different sizes to be displayed in a jquery slider. I can't seem to fit (scaling down) the image in a containing div. Here's how I'm intending to do it <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org /TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Untitled Document</title> <link rel="stylesheet" type="text/css" href="Imtest.css"/> </head> <body> <div id="wrapper"> <div id="im"><img src=

Why feature scaling?

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I found that scaling in SVM (Support Vector Machine) problems really improve its performance... I have read this explanation: "The main advantage of scaling is to avoid attributes in greater numeric ranges dominating those in smaller numeric ranges." Unfortunately this didn't help me ... Can somebody provide me a better explanation? Thank you in advance! lejlot The true reason behind scaling features in SVM is the fact, that this classifier is not affine transformation invariant . In other words, if you multiply one feature by a 1000 than a solution given by SVM will be completely different.

Scaling AR pictures based on the distance from the camera

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I’m developing an augmented reality iPhone app. What it should basically do is display pictures assigned to geographical locations when you look at them by the camera. Each such picture may be understood as a billboard which has its geographical position and a heading (understood as an angle between its plane and the north direction axis). The goal is to make these billboards display more or less like they were physical objects. They should be larger if you are close to them and smaller when farther. They should as well appear in a proper perspective when you don’t stand directly in front of

UIImageView, setClipsToBounds and how my images are losing their head

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问题 I'm developing an iOS 4 application. I'm using this code on an UIImageView on an UITableViewCell : cell.photo.contentMode = UIViewContentModeScaleAspectFill; [cell.photo setClipsToBounds:YES]; My images are taller than wide, and when I set UIViewContentModeScaleAspectFill , images are scaled to fit width with UIImageView width. Doing this, the image gets bigger that UIImageView and I see it outside UIImageView . Then, I need to use setClipsToBounds:YES to don't allow this, but now all my

Scale measurement data

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I have some measured data, experiment.dat which goes like this: 1 2 2 3 Now I want to plot them via some command line plot "experiment.dat" using 1:2 title "experiment" with lines lw 3 Is there some way how to scale the different lines with some scaling factor like -1? Yes, you can do any kind of calculations inside the using statement. To scale the y -value (the second column) with -1 , use plot "experiment.dat" using 1:(-1*$2) 来源： https://stackoverflow.com/questions/19583526/scale-measurement-data

DPI Scaling in .Net 3.5 in Mixed WinForms and WPF Application

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In this post , CodeNaked discusses how to change the TextFormattingModeProperty of the application. This solves my problem (see below) perfectly in .Net 4. However my production application is in .Net 3.5 which doesn't have that property at all. How do I accomplish the same thing in .Net 3.5? My root problem: I have a winforms application based in .Net 3.5 that has some WPF controls on certain screens. When the Windows DPI setting is set to 150% (not 120%), scaling occurs as expected. However, as soon as a WPF control is created, the scaling is set back to 100% for all windows. I would like

Gnuplot minimum and maximum boundaries for autoscaling

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问题 How can I limit the autoscaling of gnuplot, so that, as example for the y-max, it is at least a certain value and it would autoscale up to fixed "limit"? From looking at the documentation, I only see how to fix min-, or max- end of the axis, while the other is being scaled automatically. About autoscaling on PDF page 93 回答1: Since version 4.6 gnuplot offers a new syntax to specify upper and lower limits for the autoscaling. For your case you could use set xrange [0:100 < * < 1000] Quoting