libgdx - Wie zeichne ich ein Pixel

Question

Ich versuche, eine Pixmap zu ändern und zu rendern, aber modifizierte Pixel werden nicht auf dem Bildschirm angezeigt. Ich bin mir nicht sicher, ob eine Pixmap der beste Weg ist. Kann mir jemand erklären, wo meine Fehler in dem Code unten sind? danke

package com.me.mygdxgame; 
import com.badlogic.gdx.ApplicationListener; 
import com.badlogic.gdx.Gdx; 
import com.badlogic.gdx.graphics.Color; 
import com.badlogic.gdx.graphics.GL10; 
import com.badlogic.gdx.graphics.OrthographicCamera; 
import com.badlogic.gdx.graphics.Pixmap; 
import com.badlogic.gdx.graphics.Pixmap.Format; 
import com.badlogic.gdx.graphics.Texture; 
import com.badlogic.gdx.graphics.Texture.TextureFilter; 
import com.badlogic.gdx.graphics.g2d.Sprite; 
import com.badlogic.gdx.graphics.g2d.SpriteBatch; 
import com.badlogic.gdx.graphics.g2d.TextureRegion; 
import com.badlogic.gdx.utils.Array; 

public class MyGdxGame implements ApplicationListener { 

    private OrthographicCamera camera; 
    private SpriteBatch batch; 
    private Pixmap _pixmap; 
    private int _width; 
    private int _height; 
    private Texture _pixmapTexture; 
    private Sprite _pixmapSprite; 
    private int _x = 0; 
    private int _y = 0; 

    @Override 
    public void create() {  
     float w = Gdx.graphics.getWidth(); 
     float h = Gdx.graphics.getHeight(); 

     camera = new OrthographicCamera(1, h/w); 
     batch = new SpriteBatch(); 

     _width = (int)Math.round(w); 
     _height = (int)Math.round(h); 
     _pixmap = new Pixmap(_width, _height, Format.RGBA8888); 
     _pixmap.setColor(Color.RED); 
     _pixmap.fillRectangle(0, 0, _width, _height); 
     _pixmapTexture = new Texture(_pixmap, Format.RGB888, false); 
    } 

    @Override 
    public void dispose() { 
     batch.dispose(); 
     _pixmap.dispose(); 
     _pixmapTexture.dispose(); 
    } 

    @Override 
    public void render() { 
     updatePixMap(); 

     Gdx.gl.glClearColor(1, 1, 1, 1); 
     Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); 

     batch.setProjectionMatrix(camera.combined); 
     batch.begin(); 
     batch.draw(_pixmapTexture, -_width/2, -_height/2); 
     batch.end(); 
    } 

    private void updatePixMap() { 
     _x += 1; 
     if (_x >= _width) { 
      _x = 0; 
     } 

     _y += 1; 
     if (_y >= _height/2) { 
      return; 
     } 

     _pixmap = new Pixmap(_width, _height, Format.RGBA8888); 
     _pixmap.setColor(Color.CYAN); 
     _pixmap.drawPixel(_x, _y); 
     _pixmapTexture = new Texture(_pixmap, Format.RGB888, false); 
    } 

    @Override 
    public void resize(int width, int height) { 
    } 

    @Override 
    public void pause() { 
    } 

    @Override 
    public void resume() { 
    } 
} 

Answer 1

Sie erstellen ein neues Pixmap für jede Schleife und Sie zeichnen nicht die komplette Textur in Ihrer Ansicht.

import com.badlogic.gdx.ApplicationListener; 
import com.badlogic.gdx.Gdx; 
import com.badlogic.gdx.graphics.Color; 
import com.badlogic.gdx.graphics.GL10; 
import com.badlogic.gdx.graphics.OrthographicCamera; 
import com.badlogic.gdx.graphics.Pixmap; 
import com.badlogic.gdx.graphics.Pixmap.Format; 
import com.badlogic.gdx.graphics.Texture; 
import com.badlogic.gdx.graphics.g2d.SpriteBatch; 
import com.badlogic.gdx.math.MathUtils; 

public class MyGdxGame implements ApplicationListener { 

    private OrthographicCamera camera; 
    private SpriteBatch   batch; 
    private Pixmap    _pixmap; 
    private Texture    _pixmapTexture; 
    private int     _x = 0; 
    private int     _y = 0; 
    private float    _w; 
    private float    _h; 
    private int     _width; 
    private int     _height; 

    @Override 
    public void create() { 
     _w = Gdx.graphics.getWidth(); 
     _h = Gdx.graphics.getHeight(); 
     _width = MathUtils.round(_w); 
     _height = MathUtils.round(_h); 

     camera = new OrthographicCamera(1f, _h/_w); 
     camera.setToOrtho(false); 
     batch = new SpriteBatch(); 

     _pixmap = new Pixmap(_width, _height, Format.RGBA8888); 
     _pixmap.setColor(Color.RED); 
     _pixmap.fillRectangle(0, 0, _width, _height); 
     _pixmapTexture = new Texture(_pixmap, Format.RGB888, false); 
    } 

    @Override 
    public void dispose() { 
     batch.dispose(); 
     _pixmap.dispose(); 
     _pixmapTexture.dispose(); 
    } 

    @Override 
    public void pause() { 
    } 

    @Override 
    public void render() { 
     updatePixMap(); 

     Gdx.gl.glClearColor(1, 1, 1, 1); 
     Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); 

     batch.setProjectionMatrix(camera.combined); 

     batch.begin(); 
     batch.draw(_pixmapTexture, 1f/2f, _h/_w/2f); 
     batch.end(); 
    } 

    @Override 
    public void resize(final int width, final int height) { 
    } 

    @Override 
    public void resume() { 
    } 

    private void updatePixMap() { 
     _x += 1; 
     if (_x >= _width) _x = 0; 

     _y += 1; 
     if (_y >= _height/2) return; 

     _pixmap.setColor(Color.CYAN); 
     _pixmap.drawPixel(_x, _y); 
     _pixmapTexture = new Texture(_pixmap, Format.RGB888, false); 
    } 
} 

Aber das ist sehr langsam, also warum willst du es tun?