gradient

问题 I get gradient image with this method func gradient(size:CGSize,color:[UIColor]) -> UIImage?{ //turn color into cgcolor let colors = color.map{$0.cgColor} //begin graphics context UIGraphicsBeginImageContextWithOptions(size, true, 0.0) guard let context = UIGraphicsGetCurrentContext() else { return nil } // From now on, the context gets ended if any return happens defer {UIGraphicsEndImageContext()} //create core graphics context let locations:[CGFloat] = [0.0,1.0] guard let gredient =

问题 I attempted to replicate this component (at the bottom of the post), but I can't seem to get it to look nice. So I'm wondering, how do I replicate this gradient paint? Or if it isn't the gradient paint, what do I do to get similar results? My attempt turned out very flat black compared to this component. Also it had the JFrame options (close, minimize, etc) and it didn't have a 'rounded' look to the components. I'm looking for someone who can improve what I have and explain where I went wrong

问题 In CSS, this seems to be the easiest way to create solid looking gradients where colors end and start abruptly at color stops. Example - background-image:linear-gradient(to bottom, gray 100px, white 0); /*Let the browser decide*/ OR background-image:linear-gradient(to bottom, gray 100px, white 100px); /*Explicitly specify.*/ What happens is that a gradient is generated but it doesn't really have crisp edges where the colors meet. My assumption was that the code would result in gray stopping

问题 I'm trying to get a bottom to top white to transparent-white transition in my React Native screen using Expo Linear Gradients: https://docs.expo.io/versions/latest/sdk/linear-gradient.html I copied the second example and flipped it around, and made it white instead of black. But now the "transparent" the white is supposed to fade in to is darker that the white is, see below: The transparent actually is see through so that's good but is there a way to give it a white hue? Code here:

问题 I have changed icon tint in BottomNavigationView using selector and gradient color as tint when icon is pressed, but instead changing icon tint to gradient Android made all my icon purple. My question is if there is any possibility to change tint of icons in BottomNavigationView to be gradient color? BottomNavigationCode: <com.google.android.material.bottomnavigation.BottomNavigationView android:id="@+id/nav_bottom_main" android:layout_width="match_parent" app:itemIconTint="@color/bottom_menu

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . I have some experience making linear gradients in CSS but I would really like to make a radial gradient similar to this image http://i.stack.imgur.com/T85xO.png Basically a light grey radial positioned at the bottom of the element 回答1: Radial gradients are in an implementation

问题 I had an idea to programmatically generate matching color schemes however I need to be able to generate a linear gradient given a set of two colors (Hex or RGB values). Can anyone provide me the (pseudo-)code or point me in the right direction to accomplish this task? EDIT : I forgot to mention, but I also need to specify (or know) the number of steps the gradient takes from color A to color B. 回答1: Okay, so you know the steps, start color and end color. Assuming you have RGB values for each

问题 When I draw a gradient fill with OpenGL, the output looks striped, i.e. it's rendered with only about the a fourth of the possible colors. In the render buffer all the colors appear but not in the actual output. I'm developing on iPhone 3G running iOS4. Any ideas? Peter ========== ========== GLint redBits, greenBits, blueBits; glGetIntegerv (GL_RED_BITS, &redBits); // ==> 8 glGetIntegerv (GL_GREEN_BITS, &greenBits); // ==> 8 glGetIntegerv (GL_BLUE_BITS, &blueBits); // ==> 8 glDisable(GL_BLEND

问题 I have a curve and I want to find the normal vector at a given point on this curve, later I have to find the dot product of this normal vector with another vector. I tried the gradient function of MatLab, but I guess it doesnt work when we need to find the gradient at a specific point still I am not sure if I am wrong. Please guide me how can I achieve this in MatLab. Thanks in advance. 回答1: Using the explanation from this incredible SO question: if we define dx=x2-x1 and dy=y2-y1, then the

问题 I'm writing an interactive tutorial for a web app that is meant to highlight the various parts of the user interface. The tutorial is meant to spotlight one part at a time and tell the user how to interact with it. You've probably seen something similar on smartphone apps. For the specific CSS that could be used to spotlight an existing interface, the best solution I've found is using something like this, which is just a div on top of the existing interface that allows portions to be