I am drawing a gesture on the screen. Can we control the speed of drawing the gesture ?? It is being displayed but directly without showing how it was drawn.. I tried using sleep(), wait() methods but didn't work. I want it show the path how the gesture was drawn slowly.. Is it possible ?
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I have a custom view that allow me to draw lines on canvas and it works fine .
what I want is to see the drawing while its drawing in the foreground and make the user control the speed of drawing and can it be convert the drawing period to video ?
my code for drawing lines is
public ArrayList<BlockDraw> drawers = new ArrayList<>();
public void draw(Canvas canvas) {
for (BlockDraw blockDraw : drawers) {
canvas.drawLines(blockDraw.list.pointlist, 0, blockDraw.list.count, blockDraw.paint);
}}
If you have a custom view, onDraw gets called when the view needs to update, and you draw on the canvas to create the new image. It's just a single image, drawLines is just a convenient way of drawing a bunch of stuff.
You can call invalidate() at the end of onDraw to make it fire next frame, so you're constantly redrawing the canvas - that will let you create an animation by changing what you draw over time, e.g. gradually increasing the end value in drawLines from 0 to blockDraw.list.count (depending on the "draw speed" you let the user set).
That would just let you draw 1 line, then 2 lines, then 3 etc. If you want to animate each line actually extending from its start point, like you're watching it being drawn by a pen, that's a lot more complex, but you'd do it the same way! Each frame, calculate what needs to be drawn and draw it, depends on how complex you want to make it.
Video is a whole other thing, the emulator will let you record video of your app if that's what you want.
I'm creating a simple Breakout game and I've encountered a couple of problems.
First off, I need to render the bricks, the paddle, etc... I need to generally render everything on the screen that's needed. However, I don't want, for example, the bricks to continuously render; you can see where the render is occurring as it happens. There's a flash of white.
So, my question is: is it possible to render only certain objects, or more specifically, only render what needs to be rendered?
Every time I call repaint(); I don't want the whole screen to clear and repaint.
I am making a game in LibGDX, and I have noticed that when my game is launched a black screen is shown for a few moments before the white screen of my game is drawn.
I have set the background of my app's theme to be a different color with android:windowBackground in my app's style.xml, and the preview window shows that color. However, right before the main screen of my app loads, the screen goes black for a moment before displaying the main screen.
I've tried setting Gdx.gl.glClearColor(1,1,1,1) in the main activity and Game class of my game, but the black screen still shows for a moment before drawing the main screen.
The only way I've found to fix this is to set the android:windowDisablePreview to true, but that disables the preview window all together.
Is there any way to fix this without disabling the preview?
In addition to shifting objects creation to constructor, you also need to shift the ApplicationListener object creation in Activity class's constructor.
The black screen is probably because of the time delay between start of Activity.onCreate() call and end of ApplicationListener.show() call.Try to measure it using a timer or simply System.currentTimeMillis() so the difference would be visible.
This should improve the situation if not eliminate the problem.
I want to make a rectangle to move object insade rectangle to other position on canvas, if anyone has any suggestion I will be very happy.
Here is an example:
This must be a paint application, so you should already have some code and you'd better post it, so we could use as the starting point.
You need to write a custom widget and intercept touch events to build the selection. Whenever the selection changes, you have to repaint the UI to draw the selection rectangle. When you detect the end of the gesture, the widget listens to touch events to decide if the user wants to move the selected area (the touch gestures started inside the selection) or deselect it and maybe start a new selection. Again, if the user is dragging the selection, every new touch event causes an invalidate() on the component.
What exactly is it that you are displaying?
If it is a image you can dimply duplicate the pixels in a selected rectangle and temporary save it in a new image until the drag motion stop and then paint it back on the original image.
Here is my problem:
I currently have on Canvas in my main game activity that is constantly being drawn with OnDraw(). This is a board game with two players. When a player's turn begins, there are many options that the player can do, and I would like all of this to be put in a different class.
Also, this new class must draw NEW animations on top of the current canvas. These animations will came from attacks (I haven't even looked into animations yet). So basically I would like another canvas on top of the main one.
Furthermore, the OnDraw function in the main activity must PAUSE and wait for the other class with the canvas on top to complete.
Let me try and summarize this: I have a main game class with one canvas. This class handles the players' turns and setting up the game. It also draws the playing field. I need another class, when it is a player's turn, to draw animations and other things on top of the current canvas.
Can anybody help me with this?
NOTE : I looked into Fragments and FragmentManager, but it seems I can only use XML Views with that and not RenderViews.
Thank you!
You might want to consider using multiple bitmaps as buffers and then just add them on top of each other before rendering to the canvas.
There is a nice example in the "samples" pack that comes with the sdk that shows of how you can merge bitmaps on top of each other.
Let me know if you want to try this out and need some more pointers on how to do it :)