Android :: Draw And Scale A Bitmap On A Canvas Using Bicubic Interpolation

Mar 25, 2010

I want to draw a bitmap on a canvas with bigger size than it is. I can use canvas.drawBitmap(bitmap, null, destRect, null); but that gives a poor quality, as the result is pixelated, if the source image is sightly smaller than the destination rectangle. How can i draw my bitmap using bilinear or bicubic resampling?

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Android :: Reset Canvas - Draw A New Bitmap Into The Canvas

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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Android :: Create Mutable Bitmap From Camera - Draw Another Bitmap On Top - And Save It

Apr 2, 2009

I am 1) taking a picture and 2) then draw another Bitmap on top of it 3) then I store it

I am doing it as follows and it works on the emulator.

On the device I get a OutOfMemoryError: bitmap size exceeds VM budget android.graphics.Bitmap.nativeCopy(Native Method) android.graphics.Bitmap.copy(Bitmap.java:199) in the line copy the Bitmap to get a mutable Bitmap.

CODE:...........

What I am asking:

a) Is there a better way to do what I am doing? 1) take a picture 2) draw another Bitmap on top of it 3) then I store it

b) What is the best way to create a mutable Bitmap from the picture I just took with the camera?

In my app, resolution is not an issue. If it works better for small photos that would be fine.

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Android :: Overlay Bitmap - Draw Over A Bitmap

Oct 8, 2009

I have two questions actually:

Is it better to draw an image on a bitmap or create a bitmap as resource and then draw it over a bitmap? Performance wise... which one is better?

If I want to draw something transparent over a bitmap, how would I go about doing it?

If I want to overlay one transparent bitmap over another, how would I do it?

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Android :: Draw A Bitmap Rotated Onto Another Bitmap

Mar 22, 2009

My goal is the draw a bitmap onto another bitmap but rotated 90 degress. whats the most efficient way to do that. My current method is as follows which is horribly bad because it creates a new bitmap every time.

CODE:.....................

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Android :: Best Way To Scale A Bitmap In A View?

Mar 24, 2010

I have a custom view which is drawing some bitmaps on screen. I want to scale the bitmaps depending on some sensor data. Can anyone suggest to me the best way (performance wise) to scale the bitmaps.

Right now I'm creating the bitmaps in the constructor of the view but if I start to scale it in the onDraw method I believe I'll just be re-drawing the bitmaps (Which will be a memory / cpu hog).

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Android : How To Scale A Bitmap Object In Java

Apr 14, 2009

I have constructed a Bitmap object in Java. Can you please tell me how can I scale it (x, y with a different ratio) on android?

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Android :: Native Sdk Function To Scale Bitmap?

Jan 27, 2010

Is there some native android SDK function which takes bitmap and desired new bitmap dimensions and then returns scaled bitmap?

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Android :: Draw From Old Canvas

Oct 28, 2010

I'm making an App that needs to be able to draw new graphics on top of the last set.

This is my current onDraw() method -
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
if(points.size() > 0) {
//do some stuff here - this is all working ok
canvas.drawLine(p1.x, p1.y, p2.x, p2.y, linePaint);
}
}

Basically, I need to draw the new graphics as a layer on top of the last, so what I'm looking for is a way to carry the image of the last canvas to the current. I have tried to figure it out myself using the canvas.setBitmap() method but it acts very funny.

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Android :: Draw Text On Canvas?

Oct 28, 2010

i'm trying to develop a simple pie chart class for android. For now, it can take a map of labels and values and draw the pie chart. I'm yet to add the legends for the pie, which is where i need to place the texts near small rectangles on the screen corner. Any help appreciated, since i'm new to Android dev.

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Android :: How To Repeatedly Draw On A Canvas?

Sep 7, 2010

My requirement is to draw a line on canvas for every second. I am able to draw the line but its clearing the previously drawn lines when I call myview.invalidate(). Now my question is how to draw a new line retaining all the previously drawn line on the same canvas.

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Android :: Drawable Cannot Draw Into Canvas / What To Do?

May 26, 2009

I want to load an icon from resource and draw over it. But I cannot get it into a canvas. Can anyone please help me with the code below. If I uncomment c.drawColor(), I get blue color as expected. So the problem is on icon.draw(). code...

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Android :: Can I Draw Views On Canvas

Sep 28, 2010

I want to load e.g. LinearLayout with some Buttons from XML and draw it on Canvas in a way that the Views behave normally (I can set onClick actions for the Buttons and when I press a Button, it changes it's background drawable). Can I do this?

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Android : Way To Draw Nine Patch Onto Canvas?

Jan 24, 2010

I'm trying to draw a nine patch onto a Canvas object on the Android. What seems strange is that although I generated my nine patch using the draw9patch tool, the constructor for NinePatch requires an additional byte array called the "chunk" to construct the nine patch. Why isn't this simpler? What is the "chunk"? And if you have done this yourself, how did you go about it?

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Android : Can I Draw Outside Bounds Of An Canvas

Oct 26, 2010

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?

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Android : Preventing Scale On Bitmap Created In Execution Time For ImageView

Sep 23, 2010

I have a ImageView acting as a top banner on top of a webview. The image of this banner is created in execution time dependending on the resolution of the device. The height of the banner is always the same for each resolution. The only thing that changes is the width, which changes according to the orientation. But, since the width changes and the height doesn't, I end up having sort of 2 images with different proportion. And this is way the scale down/up won't work out for me.

Another problem is that everytime the user rotates the screen, the banner image is created again but Android seems not to update the image and thus I have a banner missing part of it.

I thought about having a real big image that will fit for both landscape and portrait orientation. But this seems not to be a good idea since Android keeps resizing the image everytime so it will fit on the space of the ImageView.

I'm running out of ideas here. Can someone suggest something?

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Android :: Using StaticLayout With Canvas To Draw Text

Feb 4, 2010

I have figured out the static layout this far, but I have no idea how to make it display my text anywhere else but in the top left corner. StaticLayout layout = new StaticLayout(text, getTextPaint(), 140, android.text.Layout.Alignment.ALIGN_CENTER,(float)1.0, (float)0.0, true); layout.draw(canvas);

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Android :: How To Increase FPS When Draw On Canvas - Now 20 - Desired 40-50

Jan 18, 2010

First I want to say that I have read many articles on this subject in this forum and on some external resources(very helpful was Robert Green's diary at www.rbgrn.net and www.droidnova.com).

However, despite all of this I want to start topic regarding FPS, and ask for advice from experienced game developers on Android platform.

My main question is "How to improve FPS when draw on Canvas?"

I have implemented simple 2D arcade game skeleton for testing purpose. Now I have ~20 FPS and want to increase this value to 40-50 FPS, if this is possible of course. I know about Open GL ES, but so far I am interested in Canvas.

In every frame I draw following stuff on the screen: - Canvas.drawColor(Color.BLACK) - to clear the screen - 1 spaceship PNG 24x24 image 1.25 kb - 5 asteroids PNG 64x64 image ~8 kb each - from 1 to 30 bullets PNG 8x8 image 299 b - 4 30x30 Rectangles - to control objects on the screen

After running my app, in logcat I can see following output data: - Average FPS: 20 (Total frames drawn: 1945 in 97 seconds) - Average onDraw: 32 ms (clear canvas: 3, draw game stuff: 26, draw controls: 1) - Average updatePhysics: 1 ms

From this output I can assume, that my main problem here is "draw game stuff" wich includes: - draw 1 spaceship - draw 5 asteroids - draw from 1 to 30 bullets

Here is my code:........................

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Android :: Draw Canvas Using Blur Effect?

Dec 30, 2009

I need do draw on Android's Canvas using Blur effect, it is a very simple feature, I need to draw a circular area, which is blurred (the foreground) and the background transparent, I can do everything with manipulating the colour alpha to do it with custom transparency but I need it to be blurred instead of transparent..

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Android :: Code To Draw Hands On Canvas?

Jun 28, 2010

I want to draw hands on the canvas which is smooth and closed arc. How can I draw it? Any code regarding graphics or reference class to draw it will be helpful.

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Android :: How Google Map Draw On Canvas In Droid

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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Android :: Bitmap Image From File Does Not Scale On High Density Device / Display It?

Sep 24, 2010

I have problem with displaying bitmap image on imageview on high density screen (480x800). When the bitmap image loaded from file on sdcard, the image does not scale to fit hdpi screen. On medium density screen it works normal (320x480).code...

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Android : How To Blur A Canvas / Bitmap?

Feb 6, 2010

Can anyone point me to an example of how to blur a Canvas or Bitmap?

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Android :: Draw Shape Or Bitmap Into Another Bitmap - Java - Android

Jun 22, 2010

I want to draw a shape(many circles particularly) into a Specific Bitmap. I have never used canvas / 2D graphs etc. As i see it i create a Drawable put the bitmap in it then "canvas-it" to the shapes i want etc.

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Android :: How To Draw Canvas In Respect Of Phone Orientation?

Oct 11, 2010

There is no problem with portrait mode but when i try my app on landscape mode it doesn't look how it should.What is general approach to solve this problem.My first idea is replacing X and Y places.If i am on the right track how should i do this ? Should i use an if statement at the beginning of the onDraw() function and write entire same code twice (one for x,y and other is for y,x) ?

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Android :: Draw Multiple Shapes Using Loop - Canvas

Aug 7, 2010

I am very new to android development and have been trying to draw a square comprised of multiple smaller rectangles of different colours... Like a Mosaic essentially. Basically at the moment I am reading values from a file which assigns the colour to the smaller Rects. I am using a pair of nested for loops to try to draw the small Rects sequentially, line by line. However when the program finishes there is only one small Rect drawn which is the last one to be drawn and its colour corresponds to the first value read from the file. Here is some of my code to show you what I mean:

public SnapshotDraw(Context context) {
super(context);

for(int a = 0; a < 63; a++){
for(int b = 0; b < 63; b++){
fileName = PREFIX + "2" + EXTENSION;..............

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Android :: Draw A View On A Canvas By Giving X , Y Postion?

Sep 29, 2010

How can i draw a view on a canvas by giving the x,y position in the canvas.

For example,
I have custom view myView, which was created by inflating one of my layout.xml file.
Now i want to draw this myView on the canvas at position (x, y).

How can i do that? code...

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Android :: RuntimeException: Canvas: Trying To Use A Recycled Bitmap ..

Aug 22, 2009

I am getting the following logs when i am changing the wallpaper for Homescreen. Even i am recycling the bitmap is done when the wallpaper changes in OnWallpaperChanged(). Still i m getting the bellow error.

CODE:.........................

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Android :: Difference Between View's And Bitmap's Canvas?

Mar 6, 2009

Can anyone explain me the difference between View's Canvas and Bitmaps Canvas

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Android :: How To Obtain The Current Bitmap Of A Canvas

Nov 16, 2010

I want to get the current bitmap associated with my canvas so I can perform operations on it. I can't see how to do this though.

I've seen some examples where you create a bitmap and set the canvas to use this bitmap, so obviously you can then access it later, but I'm using the canvas returned from a SurfaceHolder so there's no constructor.

For instance, examples often show this kind of thing:

CODE:...........

So at this point I can see bmp.

In my case, the canvas is obtained by:

CODE:......

So how can I get the bitmap for c?

In short, my aim is to capture the current canvas contents where I have drawn "stuff", and make a copy of it, reversed, to put underneath. Like a reflection. The example of this that I found performed it all via bitmaps, so I assumed I needed to somehow capture the current canvas to a bitmap to then use it.

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Android :: Invert A Bitmap When Using Canvas.DrawBitmap?

May 14, 2010

I am starting to develop a game. Right now I got a sprite animation going when a player moves across using sprite sheet. In my sprite sheet the character is always facing the same way, left. Now if I want the character to move right, I want it to be facing right. So is there a quick way in android to invert the bitmap after it has been loaded in? Or do I have to create sprite sheet for character facing right?

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Android :: Draw Translucent Bitmaps Using Canvas Without Having To Resort To OpenGL?

Mar 17, 2010

I have a Bitmap object and want to render it to a Canvas object with varying levels of translucency (i.e. make the whole bitmap partially see through). For example, I have sprites in a game (that are drawn over the top of a bitmap background) that I want to fade out from being opaque to being invisible. Can I do this without having to resort to OpenGL?

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Android :: Method To Draw Bitmaps Faster On Droid Canvas / OpenGL?

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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Android :: Draw On Bitmap

Nov 11, 2010

I'm trying to figure out how to draw on a bitmap in android, and keep a copy of these changed bitmaps for an undo function.

Bitmap b = ...
Paint p = new Paint();
canvas.drawBitmap(b, new Matrix(), null);
canvas.drawCircle(0,0,20,20);
//does Bitmap b have the circle drawn on it next time?

Or how do I get the bitmap after its been drawn on with the canvas(I want to preserve a stack of bitmaps with the changes applied by canvas drawing)? Maybe I'm going about this entirely wrong.

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Android :: Detect When User Presses On A Bitmap Which Is Inside Canvas?

Mar 15, 2010

Does anyone how I go about detecting when a user presses on a bitmap which is inside a canvas?

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Android :: Draw Text On A Bitmap

Jun 14, 2009

Can i draw text on a bitmap? I cannot find any API support this.

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Android :: Draw GLSurfaceView To A Bitmap

Nov 4, 2009

I have an application that uses GLSurfaceView to draw OpenGL ES graphics. This is all working (mostly) how I would expect.

Now, I would like to implement a screenshot feature. For normal views, it seems that the standard practice is to create a new Canvas with a Bitmap and then draw to that Canvas using View.onDraw(Canvas).

I've tried using SurfaceView.draw(Canvas) in a similar fashion, but it always results in a blank (black) image.

I've also tried using the drawing cache with the exact same result.

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Android :: Draw A Bitmap Image?

Dec 2, 2009

Any one know about how to draw a bitmap image?...

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Android :: Draw Bitmap On Overlay

Nov 12, 2009

I've been trying almost everything and been searching and reading everywhere on the net. I just can't seem to find the correct way of doing this.

I have a MapActivity with a MapView and I want to draw something on an Overlay. I'm overwriting the draw-method, and I can easily draw straight on the canvas using a paint. My problem is I want to merge some circles and afterwards color them. Therefore I want to create a Bitmap and then draw on that. I just don't know what to use. Should I use a mutable Bitmap, a BitmapDrawable or am I simply going in the wrong direction.

The reason I want to do this is because I want to draw some kind of heatmap upon the Google Maps, and I need to merge and blend different circles, so they appear to be just one big blob.

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Android :: Draw A Piece Of Bitmap

Mar 9, 2009

I'm creating a simple game for Android and faced with a problem: Idea is to have a huge "map" image file and re-draw only small part of it (320*480) depending on user actions.

I didn't find a better solution than using "public static Bitmap createBitmap (Bitmap source, int x, int y, int width, int height)" method and decided to try it (expected huge performance degradation), but actually it's appeared that this method changes source bitmap and when i call it second time source size is significantly reduced. For instance this code:

CODE:.................

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Android :: Draw A Bitmap - Using OpenGL

Aug 30, 2010

I have a byte array of RGB values, just like the contents(without header) of a *.bmp file. What I want to do is, draw the corresponding bitmap on Android, using OpenGL.

It seems that OpenGL ES doesn't have a single API that will do, it true?

If true, how can I do this?

Actually, I can draw it in JAVA code, but it's too slow and costs too much CPU time. So I want to try drawing it with OpenGL. Is there any other advises? Or maybe OpenGL can't be the right answer?

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Android :: Draw Bitmap Fastest Mode

Dec 25, 2009

What 's the fastest way to display a bitmap? Now I am using Bitmap.setPixels and ImageView.setImageBitmap all time that this change. It has a refresh of 15 fps. It work good, but I am not sure that is the best method to get best performance. Is better use Canvas.drawBitmap with a SurfaceView ? or opengl ?

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Android :: Draw A Circular Region Of A Bitmap

Mar 26, 2009

In my Java code I am setting the content of an ImageView to a Bitmap. However, before doing so I want to clip the Bitmap to a circular region. How would I go about this? I've been looking for some API that would let me set the alpha channel of the Bitmap to fully transparent for all pixels outside the circular region.

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Android :: Draw A Bitmap By Specifying The X Y Locations Of Four Corners

Mar 1, 2010

I want to draw a bitmap on the screen by specifying the x,y locations of the four corners. I.e. I have a square bitmap and I would like to draw the:

CODE:.........

I have seen the Canvas method: public void drawBitmap (Bitmap bitmap, Rect src, RectF dst, Paint paint)

However I believe this takes the top, right, bottom and left coordinates to draw the Bitmap and not the corner coordinates. I need to specify the CORNER coordinates to draw the bitmap as I may need to stretch/distort the Bitmap (I am drawing the Bitmap on a 3D spherical model).

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Android :: Draw Inflated Layout Xml On An Bitmap

Aug 6, 2009

I created a layout xml file that contains an extended textview. What I want is to draw the textview in a bitmap. What do I have to do after inflating the view so that I can use the draw method on the my canvas?

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