Android :: Way To Get Pixel Values From Droid Canvas
Jul 9, 2010
I'm currently writing an Android game using surfaceView. I've optimized the game as much as possible and it runs quite smoothly. However, I have collision detection incorporated which is a bit messy. I would like to do collision detection by reading pixels directly from the canvas. Is this possible to do? The closest to this that I have found was to attach a new bitmap to the canvas using setBitmap. Then when I drew to the canvas, the bitmap would be updated. Would this be the way to go?
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Jun 16, 2009
How can I get Pixel color of a coordinate? There is no method like canvas.getColor(x,y).
Actually, I am new to game developement. I am developing a Game which will restrict object if it comes to that boundary like in pac-man. How can I check that object has reached upto the boundary?
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Jul 21, 2010
I am working on a little side project (program for Android platform)and I don't exactly have a problem, but I don't really know where to start. The project I am working on has to do with getting the info and manipulating a pixel's RGB values inside an image. I know this is a very basic program (not going to disclose all the information about the project), but I am a beginning android programmer.
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May 22, 2009
Before I submit this I just wanted to check it's not a java nuiance.
The Color class can be used to extract rgb values from a pixel (32 bit int).
I implemented a lookup table filter and used a byte to store each individual r g & b value to save a bit of space.
Long story short;
CODE:...........
137 is the magic number causing the error in my case, there may be more.
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Aug 31, 2010
I might be completely off-base here, but I've spent the last two days trying to figure this out and, without success, you're my only hope.What I'm doing is simple:
* I have a canvas where I draw a circle with center on (10, 10), with radius = 5;
* Then, I obtain the canvas transformation matrix
* And then I create a new rectangle, I map it using the matrix and I use the canvas to draw it.
My problem: basically, the rectangle is being drawn in a different position along the Y-axis.I outputed the transformation matrix and, by default, it is translated by zero in the X-axis and by 25.0 in the Y-axis. Please note that I made NO transformations, either translate, scale or rotate. I am unable to understand why this is happening and how to avoid it.
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Nov 22, 2010
I have some png files that I am applying a color to. The color changes depending on a user selection. I change the color via 3 RGB values set from another method. The png files are a random shape with full transparency outside the shape. I don't want to modify the transparency, only the RGB value. Currently, I'm setting the RGB values pixel by pixel (see code below).I've come to realize this is incredibly slow and possibly just not efficient enough do in an application. Is there a better way I could do this? Here is what I am currently doing. You can see that the pixel array is enormous for an image that takes up a decent part of the screen
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Jul 7, 2010
My loadMap() method generate a canvas.throwIfRecycled exception when i try to load a new map.
When i start the game, the initial map loads and work fine though,
its only when i try to load a new map that i get the exception ..
How can i "reset" canvas and the bitmap i use to draw into, so i can startover fresh with them ?
here's what i use to create and draw my maps:
CODE:.........
So basicaly once i created and used picDest and canvas, i cannot figure how to reset it all for when i want to load a new map..
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Apr 9, 2014
I want to ask where does the defaults values of memory min-free values of a Rom reside? I mean what file I would have to edit to edit those values?
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Jul 16, 2010
This might be really nit picky but there's a dead pixel on my screen and it's very obvious when I surf the web with the white background. I'm coming from the iPhone apple would replace the phone..do you think verizon would or should I just suck it up?
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Aug 31, 2010
Do you have a dead pixel? Are you living with it?
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Nov 9, 2009
I got my new Moto Droid on the day of release, which so far I absolutely love. However, I just looked at it and noticed that there was a single dead pixel in the top left corner. I wouldn't have even noticed it had it not been on the gray background of the top status bar the rest of my wall paper is black so it would've been easy to miss.Has anyone else experience dead pixel(s) on their new phone? I'm going to try to get it swapped out this afternoon which I think they should do. It just makes me mad that I have too.
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Sep 16, 2010
I got a dead pixel, this will be #4. I am thinking about switching phones.
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Jul 22, 2010
note: this is an artist rendition because my digital camera is terrible and i couldn't figure out how to get the dust in the shot. but it looks just like this. it's a black speck under the screen that can only be seen on bright surfaces and only if you are looking at the screen head on. i'm not sure if it might be a dead pixel. i can certainly live with this problem although i'd prefer if it wasn't there.
1. is this a dead pixel or dust?
2. how do i fix this, can i just exchange it at the vzw store whenever they stop being sold out?
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Aug 7, 2010
I called up service just now and looks like I have a dead pixel that a battery pull didn't make go away. I am annoyed now because I will have to do what they called a master wipe or something and all the customizing I have done will be gone. I don't even know what I am doing but I will just go to the store by work to have them walk me through it.Is there anything I need to know about a master wipe and keeping all my stuff intact?
Is there something that wrapsol will do now that my nicely protected and wrapped phone is going back to the verizon God's?I also told them about the 2 times in the last week the phone went to sleep/blacked the screen while scrolling through the home pages without hitting a button or anything and they said neither the pixel or the phone going blank are known issues
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Mar 10, 2010
I have 3 images that I want to add one after other on a canvas.
This is my code...
but this is not working.
Can someone please tell me what I am doing wrong here.
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Mar 31, 2010
I'm just starting with Android development and I'm coming from JavaScript/HTML world so I'm currently investigating the possibilities of the Android SDK.
The HTML 5 canvas supports composite operations (See here).
Is this possible in an Android Canvas? I scanned the API of the Canvas class but couldn't find anything useful. I need at least the composite operation "source-in" or (if this isn't possible) "source-atop".
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Sep 16, 2010
Can anybody tell me or send me some links if there is any..which tells how Google map draw on canvas in android. what is the logic behind that.
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Nov 22, 2010
I am developing an android application based on web services. How can I run query (server using php and MySQL) based on the item clicked and get the result from the web. I also want to show some values as list (List layout). Is there anyway to accomplish this?
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Nov 11, 2010
How to move ball on particular angle in android canvas?
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Nov 18, 2010
How do i do an edit form functionality in android. I am a new bee to android. How do i pass on database values to XML and then submit it back..
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Nov 16, 2010
I'm developing an application which allows user to edit an image and save that edited image as new image on sd card I want to get the current state of the canvas object.
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Sep 27, 2010
I am trying to rotate a canvas with canvas.rotate and move an object on it at the same time. The problem is that with the rotation, the coordinate system of the canvas rotates as well, so I get cases when my object is supposed to be moving along the y axis, but the y axis is rotated on place of the x axis. It is a mess. Is there a way to go around this?
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Apr 24, 2010
Is it possible to define a ListPreference in Xml and retrieve the value from SharedPreferences using getInt? Here is my Xml code...
And I want to get the value with something like: int val = sharedPrefs.getInt(key, defaultValue).
At the moment I have to use getString and parse the result.
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Sep 2, 2010
From what I can incur out of the SharedPreferences documentation, I can update a preference, add one or clear all preference values in a shared preference file.
But I want to completely clear everything inside a shared preference file, not just the values, but the preferences they refer to as well.
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Jun 16, 2010
I need a small help on rotating one image around its center of axis among multiple images which are drawn to canvas in android.
I am loading images to canvas like below.
canvas.drawBitmap(mMachineBackground, 0, 0, null);
canvas.drawBitmap(mMachineRotator, 0, 0, null);
I want to rotate only the second bitmap around its center of axis instead of rotating the entire canvas(which includes first bitmap also).
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Jun 15, 2010
I currently have a game written using the Android canvas. It is completely 2D, and I draw bitmaps as sprites on the canvas, and it technically works, but I have a few features that I need to add that will require drawing many more bitmaps on the screen, and there will be a lot more movement.
The app needs more power.
What is the best way to go from this method of drawing Bitmaps on a canvas to using OpenGL so I can draw them faster?
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Jul 14, 2010
I'm not even concerned with the camera per se. I want at the closest thing to the display screen. Meaning: it could even be the desktop the user is looking at, completw w/ the background and the icons she moves back and forth.
Let's say, at time t=1 sec, the app goes to pixel (78, 300) on that display and obtains its value. What may be at (78, 300) could be a portion of the icon or some speck of tree leaf on the photo being used as desktop background.
I'm familiar with BitmapFactory.decodeFile() for getting at the pixel contents of a file. But what about the display?
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Aug 24, 2009
I am new to Android and OpenGL world. I've created a new ap using openGL ES. The package is attached with this mail. Android Simulator LCD size is 320 x 455 and i've set same size for OpenGL Viewport. But For creating visible rectangle i've to use vertices, which are of very high value.
E.g.
CODE:.....................
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Jun 28, 2010
I've created a radio button menu list ..
what I want to do is to catch the selected value from the above Char Sequence and to put to a variable .
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