opacity

问题 I'm trying to make a button that causes a green check image to fade in then fade out again. It mostly works, but how do I make the check start out in the faded out position when the page loads? I tried to put opacity: 0; in its css, assuming that the fadeIn function changes the opacity, but then it doesn't show up at all. function green_check(check) { //fade in half a sec, hold 2 sec, fade out in 3 sec $(check).fadeIn(500, function() { $(this).delay(2000).fadeOut(3000); }); } <script src=

问题 I made a little game in which i need a background pattern with lines. Because of a better performance I would like to draw the pattern in python instead of taking an image. The problem is that I can't find a way to draw the lines with transparency...there are solutions for surfaces, but not for lines. here is the pattern code: import pygame from math import pi pygame.init() size = [600, 600] screen = pygame.display.set_mode(size) while True: for i in range(0, 600, 20): pygame.draw.aaline

问题 I made a little game in which i need a background pattern with lines. Because of a better performance I would like to draw the pattern in python instead of taking an image. The problem is that I can't find a way to draw the lines with transparency...there are solutions for surfaces, but not for lines. here is the pattern code: import pygame from math import pi pygame.init() size = [600, 600] screen = pygame.display.set_mode(size) while True: for i in range(0, 600, 20): pygame.draw.aaline

问题 I made a little game in which i need a background pattern with lines. Because of a better performance I would like to draw the pattern in python instead of taking an image. The problem is that I can't find a way to draw the lines with transparency...there are solutions for surfaces, but not for lines. here is the pattern code: import pygame from math import pi pygame.init() size = [600, 600] screen = pygame.display.set_mode(size) while True: for i in range(0, 600, 20): pygame.draw.aaline

问题 I want to achieve the same linear gradient look defined by CSS on a canvas. Used a method that works great until no transparency setting is used. When there are rgba color values defined with the same linear gradient color settings the results doesn't look the same, please see the following link: JSFiddle: Example var canvas = document.getElementById("myCanvas"); var ctx = document.getElementById("myCanvas").getContext("2d"); var w = canvas.width; var h = canvas.height; var cssAng = Math.PI;

问题 Take a look at http://www.kickstarter.com. When you hover over their logo, the image lights up. Is this effect doable without using a different image on hover? My first idea was to use ::after:hover and add a white square with high transparency that covers the logo, but since my logo is placed on a blue background this would not work. Another idea is to set opacity to 0.9 and on hover set it to 1. But this makes the image look too dark by default. 回答1: As far as I am aware you can't do what

问题 Take a look at http://www.kickstarter.com. When you hover over their logo, the image lights up. Is this effect doable without using a different image on hover? My first idea was to use ::after:hover and add a white square with high transparency that covers the logo, but since my logo is placed on a blue background this would not work. Another idea is to set opacity to 0.9 and on hover set it to 1. But this makes the image look too dark by default. 回答1: As far as I am aware you can't do what

问题 Take a look at http://www.kickstarter.com. When you hover over their logo, the image lights up. Is this effect doable without using a different image on hover? My first idea was to use ::after:hover and add a white square with high transparency that covers the logo, but since my logo is placed on a blue background this would not work. Another idea is to set opacity to 0.9 and on hover set it to 1. But this makes the image look too dark by default. 回答1: As far as I am aware you can't do what

来源： https://stackoverflow.com/questions/40405278/swift-uiview-opacity-programmatically

来源： https://stackoverflow.com/questions/40405278/swift-uiview-opacity-programmatically