image-clipping | 易学教程

How do I tell when an image is clipped?

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问题 If I have a LinearLayout containing ImageViews, how could I write code to tell which, if any, is clipped by the edge of the screen? <LinearLayout android:id="@+id/imagecontainer" android:orientation="horizontal" android:layoutHeight="wrap_content" android:layoutWidth="fill_parent"> <ImageView android:id="@+id/image1" .../> <ImageView android:id="@+id/image2" .../> ... <ImageView android:id="@+id/imageN" .../> </LinearLayout> I imagine something like, which would return an index or 0 if nobody

Canvas.clipPath(Path) not clipping as expected

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问题 I'm trying to clip a canvas drawing operation to an arc-shaped wedge. However, I'm not getting the intended result after setting the clipping path to the canvas. For illustration, here is what I'm doing: path.reset(); //Move to point #1 path.moveTo(rect.centerX(), rect.centerY()); //Per the documentation, this will draw a connecting line from the current //position to the starting position of the arc (at 0 degrees), add the arc //and my current position now lies at #2. path.arcTo(rect, 0, -30

Multiple clipping areas on Fabric.js canvas

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问题 For making Photo Collage Maker, I use fabric js which has an object-based clipping feature. This feature is great but the image inside that clipping region cannot be scaled, moved or rotated. I want a fixed position clipping region and the image can be positioned inside the fixed clipping area as the user want. I googled and find very near solution. var canvas = new fabric.Canvas('c'); var ctx = canvas.getContext("2d"); ctx.beginPath(); ctx.rect(10,10,150,150); ctx.rect(180,10,200,200); ctx

Clipping images in Webgl

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问题 The 2-D canvas provides an api called draw image : context.drawImage(img,sx,sy,swidth,sheight,x,y,width,height); where sx is the position from where the image clipping starts . http://www.w3schools.com/tags/canvas_drawimage.asp, I am trying to use webgl to render a 2D image using texImage2D . i wanted to check if there is a way to implement clipping with webgl . I am using the following tutorial to render 2d images with webgl. http://webglfundamentals.org/webgl/lessons/webgl-image-processing

Cross-browser clipping masks

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问题 My web site has navigation, presented as a list of rectengular buttons with round corners . Each button should have it's own custom background, which is a photo. Photo is bigger than button and should move in response to mouse movement over this button. We have an effect, like we are looking through the window. Navigation has following HTML structure: "ul > li > a > img". I think, each "ul > li" should be a rectangle with round corner and acting as clipping mask for image. Setting "overflow:

How to crop the image in iPhone

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问题 I want to do the same thing as asked in this question. In my App i want to crop the image like we do image cropping in FaceBook can any one guide me with the link of good tutorial or with any sample code. The Link which i have provided will completely describe my requirement. 回答1: You may create new image with any properties. Here is my function, witch do that. you just need to use your own parameters of new image. In my case, image is not cropped, I just making some effect, moving pixels

Clip div with SVG path

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I have two overlapping divs and I am trying to achieve the following effect: In order to do that my logic is to get the two divs to overlap, create that shape with SVG inside the second div and use that shape to clip the second div and show what’s below it (the top div). I’m not sure if this is the best logic to follow to achieve this and if it is I’m not sure how to use the SVG to clip the HTML element. This is my HTML so far: <div class="banner_1"> </div> <div class="banner_2"> <svg viewBox="0 0 500 500" preserveAspectRatio="xMinYMin meet"> <path d="M0,20 C100,80 350,0 500,30 L500,00 L0,0 Z"

Clip div with SVG path

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问题 I have two overlapping divs and I am trying to achieve the following effect: In order to do that my logic is to get the two divs to overlap, create that shape with SVG inside the second div and use that shape to clip the second div and show what’s below it (the top div). I’m not sure if this is the best logic to follow to achieve this and if it is I’m not sure how to use the SVG to clip the HTML element. This is my HTML so far: <div class="banner_1"> </div> <div class="banner_2"> <svg viewBox

Canvas.clipPath(Path) not clipping as expected

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I'm trying to clip a canvas drawing operation to an arc-shaped wedge. However, I'm not getting the intended result after setting the clipping path to the canvas. For illustration, here is what I'm doing: path.reset(); //Move to point #1 path.moveTo(rect.centerX(), rect.centerY()); //Per the documentation, this will draw a connecting line from the current //position to the starting position of the arc (at 0 degrees), add the arc //and my current position now lies at #2. path.arcTo(rect, 0, -30); //This should then close the path, finishing back at the center point (#3) path.close(); This works,

Can I draw outside the bounds of an Android Canvas

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I'm porting an app written in a graphics environment that allows drawing to happen outside the bounds of the clipping rectangle. Any way to do this in Android? numan salati To draw outside the bounds, you need to expand the clipRect of the canvas. Check out the overloaded clipRect methods on the Canvas class. Note - You will need to specify the Region operation because the default operation is INTERSECT. So something like this: Rect newRect = canvas.getClipBounds(); newRect.inset(-5, -5) //make the rect larger canvas.clipRect (newRect, Region.Op.REPLACE); //happily draw outside the bound now