I am working with libgdx. I need to scale and position text. Let's say I want to draw X that is 30 pixels hight and I want it to be in the middle of the screen. I want to draw more of those in diffrent locations and with different scales.
Is there any way how could I achieve that? I can't find the solution anywhere. I dont want to create more BitmapFonts if possible.
If you want to handle all platforms (android, html, ios, desktop) you need to use several BitmapFonts in order to avoid ugly scaling. Otherwise, if you don't need to deploy to HTML, you can use the gdx-freetype extension (see here https://github.com/libgdx/libgdx/wiki/Gdx-freetype).
Assuming you go with BitmapFont, you can simply use code similar to this to center your text:
String text = "Your text here!";
TextBounds bounds = font.getBounds(text);
font.draw(batch, text, (width - bounds.width) / 2.0f, (height - bounds.height) / 2.0f);
For scaling, you can set the scale in font.draw, but you probably want several BitmapFont of various sizes to avoid ugly artifacts.
Related
Does it add to the image if too small or crop if too big or just stretch the image to the desired size?
When you set interpolation=2, then you are using Bilinear interpolation, ti can be either used for upsampling or down sampling. In the case of upsampling you are doing something like
There are several types of upsampling and down-sampling, but bilinear one uses a combination of the neighbouring pixels to cimpute the new pixel.
Look to this links for more informations: link1; link2
Resize stretches the image to span the new size. It samples from the original image using the provided interpolation method.
I am having some trouble specifying the size of text in ImageTextButton. I didn't found any method or property to define text size. I used the code below,but got very small text. I expect text to be bigger on higher resolution devices, since all my code is relative to the dimensions of screen. Is bitmap font the correct approach? How does one code text in ImageTextButton to be bigger on bigger devices?
font = new BitmapFont(Gdx.files.internal("font.fnt"));
ImageTextButton.ImageTextButtonStyle bts = new ImageTextButton.ImageTextButtonStyle();
bts.up = ninePatchDrawable;
bts.font=font;
bts.fontColor= Color.WHITE;
checkButton=new ImageTextButton("Text",bts);
checkButton.setBounds(Gdx.graphics.getWidth() * 0.2f, Gdx.graphics.getHeight() * 0.01f,Gdx.graphics.getWidth() * 0.24f,Gdx.graphics.getHeight()*0.08f);
stage.addActor(checkButton);
Turns out I had to choose different keywords for google search. This solves my problem How to draw smooth text in libgdx?
I've some problem for render Box2D Debug with Box2DDebugRenderer.
I've 2 OrthographicCamera, one for render the world (named Cam) and one for the HUD (healthBar, Armor, ...) (named hudCam).
I've tried to render :
b2dr.render(world, cam.combined); -> I can't see the Box2D
b2dr.render(world, cam.projection);
b2dr.render(world, hudCam.combined);
b2dr.render(world, hudCam.projection);
b2dr.render(world, new OrthographicCamera().combined); and b2dr.render(world, new OrthographicCamera().projection)
I can't find a way to render the Box2D exactly like cam, to see the edge of all bodies.
If somebody understand my problem, please help me !
Thx.
Unfortunately some tutorial out there suggest to use a meter-to-pixel-conversion when using Box2D. This is not neccessary (at least with Libgdx), as this conversion can be done by using a camera.
The problem in your case is, that you are using a meter-to-pixel-conversion when rendering the Sprites, while the Box2DDebugRenderer renders everything 1:1.
To solve this problem you have to get rid of the meter-to-pixel conversion and use the camera or the viewport to "scale" the things.
THis way, the Box2DDebugRenderer and your SpriteBatch can (and should) use the same camera to render.
For the camera/viewport:
The constructor has the params width and height. Those params are often set as Gdx.graphics.getWidth() and Gdx.graphics.getHeight(), which in my optinion is not right, the game should be resolution-independent.
You should instead select those values depending on how big your player (or any other visible entity) is in real life and how big it should be on screen.
Let's say you have a little characte, like in your game. It is 1m tall in real live and should take 1/13 of the screen height (more or less like in your first picture, where the screen is about 13 times as high as the character).
So your cameras height should be 13, your characters height (also it's Box2Ds Body height) should be 1m. Next you need to define the width. For that i like to think about my desired aspect ratio. Lets assume the game should focus on 16/9 devices, the width is then (13/9)*16=23.
Now your camera should be created like this:
camera = new OrthographicCamera(23, 13);
So I am super stoked to start using LibGDX for my first android title for OUYA and PC, but I am running into some snags with LibGDX. (All of my questions can be answered by looking at source, but I am really trying to understand the design choices as well).
To start with, the coordinate system. I created a project using the Project Setup jar, and it creates an OrthographicCamera like so
camera = new OrthographicCamera(1, h/w);
From my reading, I understand that LibGdx uses bottom left corner for 0,0 and yUp. Fine.
I see that it is pretty easy to change to y down if I want to, but I am not understanding the next bit of code that was created.
For the default sprite that gets created the position is set like so.
logoSprite.setOrigin(logoSprite.getWidth()/2, logoSprite.getHeight()/2);
logoSprite.setPosition(-logoSprite.getWidth()/2, -logoSprite.getHeight()/2);
When I run this basic program, I see the logo image I have added is centered on the screen. What I am trying to understand is why the values are negative in set position, and why is it using the sprite width and height instead of the graphics w and h of the view port? If I change to the screen width and height, then the image is drawn in some odd position in the lower right hand side of the screen.
My next question is sprite.setSize vs sprite.setScale. Why is the difference between the two? (They appear to do the same thing, except setScale leaves getWidth and getHeight unchanged).
Since my game will be using a 2D camera heavily for panning, zooming and rotation, I am trying to understand as much as I can about the libgdx framework before I start writing any code.
As a side note, I have a game development and math background and I have made several 2D and 3D games using XNA. I am finding LibGdx a bit frustrating as it does not abstract away OpenGL as much as I was expecting it to, and so far the 2D drawing I have been experimenting with seems to be more confusing than it should be!
I also wanted to note that I am planning to use spine for my animations. Should that change my choice to use y-up or y-down?
If you want to draw a sprite in center of screen, do this in your create method
logosprite.setposition(scrw/2-logosprite.getwidth()/2,scrh/2-logosprite.getheight/2);
here scrw is your viewport's width,
and scrh is your viewport's height,
this way your sprite will be in center of screen
sprite.setsize is used for setting size of the sprite and sprite.setscale is used when we scale a large/small texture so that its quality remains good in all devices(hdpi.mdpi,xhdpi,ldpi)..
no need to worry if you are using spine it works smoothly in libgdx..
You can use just this code if possible
logoSprite.setPosition(Gdx.graphics.getWidth()/2 - image.getWidth()/2,
Gdx.graphics.getHeight()/2 - image.getHeight()/2);
To center the sprite into the middle of the screen Where "image" is the Texture you have loaded/declared initially.
As for why it is coming in a odd position is due to the fact that you are using a camera.
Which changes the view a lot just go through the documentations of libgdx about camera here
In my case, I needed to set position of camera and then call update() method.
Then never forget camera's (0,0) is its center. Everything is being placed that way. My camera code:
private void cameralariUpdateEt() {
cameraGame.position.set(cameraGame.viewportWidth * 0.5f,
cameraGame.viewportHeight * 0.5f, 0);
cameraGame.update();
cameraScore.position.set(cameraScore.viewportWidth * 0.5f,
cameraScore.viewportHeight * 0.5f, 0);
cameraScore.update();
}
Call this method from inside render();
Step 1: Set the sprite origin to the position you would like it to rotate around.
// camera center point is (c.x, c.y)
logoSprite.setOrigin(c.x, c.y);
Step 2: make sure to set your sprite center to origin
logoSprite.setOriginCenter();
Step 3: Rotate your sprite
logoSprite.setRotation(Angle);
Step 4: Set the sprite position, [subtract half the sprites width and height to center the sprite]
logoSprite.setPosition(c.x - logoSprite.getWidth() / 2, c.y - logoSprite.getHeight() / 2)
I'm needing an actionscript solution that will allow dynamic text to drop into a text box with pre-determined dimensions (x, y, width, height), and then will scale the text up or down so that it is as large as it can be within those dimensions without scrolling. Wordwrap would be automatic, and there would not be any paragraph breaks.
I have a working model using Flash's Classic text, but I would like to be able to utilize the in-line styling that TLF provides. I just don't quite have my mind wrapped around all the TLF features yet.
Does anyone know if there is an already existing solution to this situation - or could perhaps steer me in the right direction?
#phil: This should help: http://aaronhardy.com/flex/size-text-to-container/
Online demo, right click for source code.
Hm - this should work, but I am not sure over how precise the TLF font size is... Anyways:
newFormat:TextFormat = new TextFormat();
newFormat.size *= myText.width / myText.textWidth;
myText.setTextFormat(newFormat);
Now - this basically creates a TextFormat object and sets it's font size to myText's (the TextField) container width (the maximal width) divided by the actual text width. Again - if the TLF font size is NOT so precise, the size line must be:
newFormat.size *= Math.round(myText.width / myText.textWidth * 100) / 100;
100 means it is rounded to hundredths.
edit: I really believe this method is not only much simpler, but also efficient... I mean - that is the point of TextField.textWidth...