scale

问题 When calling Matrix.postScale( sx, sy, px, py ); the matrix gets scaled and also translated (depending on the given point x, y). That predestines this method to be used for zooming into images because I can easily focus one specific point. The android doc describes the method like this: Postconcats the matrix with the specified scale. M' = S(sx, sy, px, py) * M At a first glance this seems ridiculous because M is supposed to be a 3x3-Matrix. Digging around I've found out that android uses a

问题 Background I'm trying to have a video shown in center-crop manner (like on ImageView). I also hope I can find how to scale in other ways, as done on this library. The problem I use this for this purpose : player!!.videoScalingMode = C.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING But for some reason it doesn't do center-cropping. What I've tried Looking at the docs, I see this: "Note that the scaling mode only applies if a MediaCodec-based video Renderer is enabled and if the output surface

问题 I have an animated component where you can select one of seventeen circles. It looks like this so far: I would like to add an animation that scales the circle as it gets closer to the center. How do I do that? Until now I tried to calculate the x value of the circle as Math.sin(index*deltaTheta*Math.PI/180 + Math.PI)*Radius and use this value in a functions which maps to a scaling factor (e.g. a gaussian). This fails because the x value does not change, because I am using CSS transform rotate

问题 I have the following df: Date Event_Counts Category_A Category_B 20170401 982457 0 1 20170402 982754 1 0 20170402 875786 0 1 I am preparing the data for a regression analysis and want to standardize the column Event_Counts, so that it's on a similar scale like the categories. I use the following code: from sklearn import preprocessing df['scaled_event_counts'] = preprocessing.scale(df['Event_Counts']) While I do get this warning: DataConversionWarning: Data with input dtype int64 was

问题 Now I'm developing an Android-based 3D app with opengl-es 2.0, I made use of an OBJ file which consists of a 3D model and a texture image (like below): Currently, the apple can rotate freely on my Samsung Galaxy II with no problem. Next, I want to enlarge the apple while keeping the definition of its texture, but I didn't make it (see below). I need help to achieve that. Any suggestion or pointing would be highly appreciated. Thanks in advance. 来源： https://stackoverflow.com/questions/13006227

问题 I'm making an Android application which uses Google Maps API, and I want to scale a MapView to X_pixels:X_meters. For example, 5 pixels of the MapView in my screen, 20 meters on reality. Is that possible? Thx 回答1: Use the following code: int nPixles = 5; //number of pixels GeoPoint g0 = mapview.getProjection().fromPixels(0, mapview.getHeight()/2); GeoPoint g1 = mapview.getProjection().fromPixels(nPixles, mapview.getHeight()/2); float[] results = new float[1]; Location.distanceBetween(g0

问题 It's possible to set the axis scale values in jfreechart? For example, I'd want X-axis scale 10 and Y-Axis scale 1. 回答1: You set the TickUnit , if you are using an XYPlot try this XYPlot plot = chart.getXYPlot(); NumberAxis xAxis = (NumberAxis) plot.getDomainAxis(); xAxis.setTickUnit(new NumberTickUnit(10)); NumberAxis yAxis = (NumberAxis) plot.getRangeAxis(); yAxis.setTickUnit(new NumberTickUnit(1)); 来源： https://stackoverflow.com/questions/11306688/jfreechart-x-and-y-axis-scaling

问题 In PyQt, I have a QGraphicsScene to which I add a rectangle with one of the standard QBrush fill patterns, in this case Qt.Dense7Pattern. This shows up as expected when the scene is displayed at original 1:1 scale: the "dots" that make up the Dense7Pattern are some number of pixels apart from each other, let's say 5 pixels apart just to pick a number. Also, let's say the original rectangle is 50 pixels wide and 50 pixels tall. When I zoom in on that scene, let's say by a factor of 2, making

问题 This question already has answers here : group by and scale/normalize a column in r (2 answers) Closed 2 years ago . I have a dataframe similar to this one ID <- c(1,1,1,1,1,2,2,2,2,2,3,3,3,3,3) p1 <- c(21000, 23400, 26800, 2345, 23464, 34563, 456433, 56543, 34543,3524, 353, 3432, 4542, 6343, 4534 ) p2 <- c(234235, 2342342, 32, 23432, 23423, 2342342, 34, 2343, 23434, 23434, 34, 234, 2343, 34, 5) my.df <- data.frame(ID, p1, p2) Now I would like to scale the values in p1 and p2 depending on

问题 I am trying to make sidebar menu like in app Euro Sport! When the menu slides from left , the sourceviewcontroller slide to left and becomes smaller. var percentWidthOfContainer = containerView.frame.width * 0.2 // this is 20 percent of width var widthOfMenu = containerView.frame.width - percentWidthOfContainer bottomView.transform = self.offStage(widthOfMenu) bottomView.frame.origin.y = 60 bottomView.frame.size = CGSizeMake(widthOfMenu, 400) bottomView.updateConstraints() menucontroller.view