alpha | 易学教程

Popover and tableview transparent

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问题 In my Ipad application I use a popover but I'm not able to make it transparent. The popover has a tableview inside; my code is: UIViewController* popoverContent = [[UIViewController alloc] init]; UIView* popoverView = [[UIView alloc] initWithFrame:CGRectMake(600, 800, 100, 100)]; popoverView.backgroundColor = [UIColor greenColor]; popoverContent.view = zoneViewController.view; self.popoverController = [[UIPopoverController alloc] initWithContentViewController:popoverContent]; [self

JButton alpha background change with mouseover

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问题 I want to have 2 buttons on my application with a transparent background and I "almost" done it. This is what I've done : public class PanelMenu extends JPanel{ //VARIABLES private JButton buttonFightSimulator, buttonMatchUp; //CONSTRUCTORS public PanelMenu () { this.setBounds(0,0,240,768); this.setLayout(new FlowLayout(0, 0, 0)); //BUTTON CREATION buttonFightSimulator = new JButton("FIGHT SIMULATOR"); buttonMatchUp = new JButton("MATCH UP"); buttonFightSimulator.setBackground(new Color(255

Is there any way to fix the horrendous toolbar icons after the Juno update?

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问题 At least on Windows 7, it looks like the title bar color may have been changed to blue. However, the title bar icons were designed only to be used on a light gray bar rather than using alpha transparency for antialiasing. Note the white highlights around the edge of the green circle "run" icon. The icons look horrendous, like we're in 1995. Is this how it appears on other Windows 7 user's installations as well? I noticed there's theming, and the closest I can find to something that works is

区间估计

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求谁 σ 是否已知 \sigma是否已知 σ 是否已知置信区间置信区间求 μ \mu μ σ 未知 \sigma未知 σ 未知 1 − α 1-\alpha 1 − α ( X ‾ − σ ( n ) Z α 2 , X ‾ + σ ( n ) Z α 2 ) (\overline X- \frac{\sigma}{\sqrt(n)}Z_{\frac{\alpha}{2}},\overline X+\frac{\sigma}{\sqrt(n)}Z_{\frac{\alpha}{2}}) ( X − ( n ) σ Z 2 α , X + ( n ) σ Z 2 α ) 求 μ \mu μ σ 已知 \sigma已知 σ 已知 1 − α 1-\alpha 1 − α ( X ‾ − σ ( n ) t α 2 ( n − 1 ) , X ‾ + σ ( n ) t α 2 ( n − 1 ) ) (\overline X- \frac{\sigma}{\sqrt(n)}t_{\frac{\alpha}{2}}(n-1),\overline X+\frac{\sigma}{\sqrt(n)}t_{\frac{\alpha}{2}}(n-1)) ( X − ( n ) σ t 2 α ( n − 1 ) , X

Setting an alpha channel when constructing an ImagickPixel

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问题 I am new to using ImageMagick. I am using the latest imagick extension (3.1.0rc1) with PHP. However, the documentation for imagick seems to be somewhat sparse. I want to create an ImagickPixel object with an alpha channel. The documentation states that these are some valid color values to pass to the constructor: "blue", "#0000ff", "rgb(0,0,255)", "cmyk(100,100,100,10)", etc . I know that it is possible to retrive the alpha value of an ImagickPixel using getColorValue(imagick::COLOR_ALPHA); .

SpatialPolygonsDataFrame doesn't plot properly when I make the color transparent

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问题 I've been struggling with this problem for a few days. I have a shapefile that contains zip code polygons. I'm trying to plot a certain portion of it with a transparent color ( alpha=0.7 ), but some of the polygons at the edge of the plot end up with no color. If alpha=1.0 , all polygons are fine. The shapefile is stored as a Large SpatialPolygonsDataFrame . # Code that you can use (Thanks jbaums) library(rgdal); download.file('http://www.naturalearthdata.com/http//www.naturalearthdata.com/do

Flatten the alpha channel in ggplot2

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问题 Some objects (functions) of ggplot2 support an alpha channel. http://docs.ggplot2.org/current/geom_point.html This is a nice feature, but transparent colours in pdf and png files are often source of diversified trouble. How can I use the alpha option and get flattened pdf output files? 回答1: I had ongoing problems with a large Latex doc created with knitr + ggplot that was perfectly readable on my mac but was unopenable for Windows users. After numerous attempts at optimizing and flattening

ggplot2: Thresholds for scale_alpha()

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问题 Is it possible to specify thresholds for color-scales? Look at this example: xy <- expand.grid(x=1:20,y=1:20) xyd <- data.frame(xy,z=runif(400),a=rowSums(xy)/40) g <- ggplot(xyd, aes(x=x, y=y, fill=z, alpha=a)) + geom_tile() + scale_alpha(range=c(0,1), limits=c(0.5,1)) g What I want is that Values of a below 0.5 get an alpha value of 0 so that the lower left half will be invisible. Obviously I could transform the original data but that would destroy the legend. 回答1: The threshold is working

ggplot2: Thresholds for scale_alpha()

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UWP Composition - Apply opacity mask to top 30px of a ListView

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问题 How can I apply an effect to a ListView where the top 30px graduate from fully transparent to fully opaque? The idea is that as you scroll down, the top items gradually fade away. I am building a UWP application where the design calls for the top 30px of a ListView to start at opacity 0 and transition to opacity 1. Conceptually I am imagining an Opacity Mask that would be applied to the top part of a SpriteVisual but I cannot work out how to achieve this. I am attempting this using the the