porter-duff

Implementing different PorterDuff modes in android

由 大城市里の小女人 提交于 2019-11-27 18:48:47
问题 I am working on a picture editing tool in which I need to merge two images. Most of the image editing tools like gimp use PorterDuff modes for merging or blending images. I am also using the same approach in android. As android provides limited number of PorterDuff modes, I am not able to achieve the desired result. So, I am thinking of implementing PorterDuff modes(Overlapping, Hard-Light, Soft-Light, Color-burn, Color-dodge) which are not included in android. The problem is I don't know

Draw a transparent circle onto a filled android canvas

由 好久不见. 提交于 2019-11-27 16:57:11
问题 I am trying to do something very simple (see above). I want all of the pixels of a canvas to be a solid color, except for the the pixels that fill a centered circle. I have read hundreds stack overflow post on this subject and have tried hundreds of things including setting the PorterDuff.Mode. Here is my current onDraw() of MyView extends View: protected void onDraw(Canvas canvas) { int w = canvas.getWidth(); int h = canvas.getHeight(); Paint framePaint = new Paint(); framePaint.setStyle

Drawing on Canvas - PorterDuff.Mode.CLEAR draws black! Why?

由 荒凉一梦 提交于 2019-11-27 15:45:26
问题 I'm trying to create a custom View which works simple: there is a Bitmap which is revealed by arc path - from 0deg to 360deg. Degrees are changing with some FPS. So I made a custom View with overridden onDraw() method: @Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); arcPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC)); canvas.drawArc(arcRectF, -90, currentAngleSweep, true, arcPaint); arcPaint.setXfermode(new

Android Gauge Animation Question

由 一世执手 提交于 2019-11-27 05:34:17
问题 Okay so i've been trying to do this for a couple of days and i am getting no where. So i have the following two images: The First is a RPM Gauge The Second image is a full white graphic representing rpm gauge being full: I want to do the following: ask the user for an RPM input, if for example they enter 1.2 the gauge will fill up as follows: I have the user input working i need help with the animation. Here is what i have tried: I have tried using PorterDuff but it also clips the gauge in

How to create a 'transparent circle inside rectangle' shape in XML in Android?

由 岁酱吖の 提交于 2019-11-27 04:22:35
问题 I'm trying to create the following design in my app. Design Mockup Its an overlay on top of the main UI. Trying to create this using a layout on top of the main UI with its background as a translucent shape created in XML. However, even after reading multiple posts, I'm not able to figure it out. I tried the following approach, but it didn't work. Created a ring shape with 200dp stroke and set it as source for a imageview and then set the scaletype to centerCrop but the shape does not scale

What does PorterDuff.Mode mean in android graphics.What does it do?

由 陌路散爱 提交于 2019-11-26 12:37:23
I would like to know what PorterDuff.Mode means in android graphics. I know that it is a transfer mode . I also know, that it has attributes such as DST_IN, Multiply etc. Phasmal Here's an excellent article with illustrations by a Google engineer: http://ssp.impulsetrain.com/porterduff.html PorterDuff is described as a way of combining images as if they were "irregular shaped pieces of cardboard" overlayed on each other, as well as a scheme for blending the overlapping parts. The default Android way of composing images is PorterDuff.Mode.SRC_OVER , which equates to drawing the source image

What does PorterDuff.Mode mean in android graphics.What does it do?

由 孤街浪徒 提交于 2019-11-26 03:01:10
问题 I would like to know what PorterDuff.Mode means in android graphics. I know that it is a transfer mode . I also know, that it has attributes such as DST_IN, Multiply etc. 回答1: Here's an excellent article with illustrations by a Google engineer: http://ssp.impulsetrain.com/porterduff.html PorterDuff is described as a way of combining images as if they were "irregular shaped pieces of cardboard" overlayed on each other, as well as a scheme for blending the overlapping parts. The default Android

Masking(crop) image in frame

由 无人久伴 提交于 2019-11-26 00:45:45
问题 Having a rich UI application in which I want to show image with complex shape like this Now what I want is to crop my image as per Mask image, Actually image is coming dynamic and can be imported from Camera or Gallery(square or rectangle shape) and I want that image to fit in my layout frame like above So just wondering that how do I have achieve this? Any idea /hint welcome Background frame Mask Like this 回答1: Finally got the solution while changing mask image and using of Xfermode with
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