implement LoadingScreen

3 files changed, 194 insertions, 4 deletions

diff --git a/core/src/ch/asynk/zproject/Assets.java b/core/src/ch/asynk/zproject/Assets.java
index 3eadf9f..8584810 100644
--- a/core/src/ch/asynk/zproject/Assets.java
+++ b/core/src/ch/asynk/zproject/Assets.java
@@ -9,6 +9,7 @@ public class Assets extends AssetManager implements Disposable
 {
     public static final String CORNER = "data/corner.png";
     public static final String MAP_00 = "data/map_00.png";
+    public static final String LOADING = "data/loading.atlas";
 
     @Override public void dispose()
     {
@@ -27,6 +28,16 @@ public class Assets extends AssetManager implements Disposable
         return get(assetName, TextureAtlas.class);
     }
 
+    public void loadLoading()
+    {
+        load(LOADING, TextureAtlas.class);
+    }
+
+    public void unloadLoading()
+    {
+        unload(LOADING);
+    }
+
     public void loadGame()
     {
         load(MAP_00, Texture.class);
diff --git a/core/src/ch/asynk/zproject/ZProject.java b/core/src/ch/asynk/zproject/ZProject.java
index 12dc982..7afca28 100644
--- a/core/src/ch/asynk/zproject/ZProject.java
+++ b/core/src/ch/asynk/zproject/ZProject.java
@@ -5,6 +5,7 @@ import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Screen;
 
 import ch.asynk.zproject.screens.GameScreen;
+import ch.asynk.zproject.screens.LoadingScreen;
 
 public class ZProject extends Game
 {
@@ -13,7 +14,8 @@ public class ZProject extends Game
     private enum State
     {
         NONE,
-        GAME
+        LOADING,
+        GAME,
     }
     private State state;
 
@@ -24,7 +26,7 @@ public class ZProject extends Game
         this.state = State.NONE;
         Gdx.app.setLogLevel(Gdx.app.LOG_DEBUG);
         debug(String.format("create() [%d;%d] %f", Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), Gdx.graphics.getDensity()));
-        switchToGame();
+        switchToLoading();
     }
 
     @Override public void dispose()
@@ -55,6 +57,7 @@ public class ZProject extends Game
             return;
         }
         switch(state) {
+            case LOADING: assets.unloadLoading(); break;
             case GAME: assets.unloadGame(); break;
         }
         if (state != State.NONE) {
@@ -69,10 +72,15 @@ public class ZProject extends Game
         switchTo(null, State.NONE);
     }
 
-    public void switchToGame()
+    public void switchToLoading()
     {
-        assets.loadGame();
+        assets.loadLoading();
         assets.finishLoading();
+        switchTo(new LoadingScreen(this, () -> assets.loadGame(), () -> switchToGame()), State.LOADING);
+    }
+
+    public void switchToGame()
+    {
         switchTo(new GameScreen(this), State.GAME);
     }
 }
diff --git a/core/src/ch/asynk/zproject/screens/LoadingScreen.java b/core/src/ch/asynk/zproject/screens/LoadingScreen.java
new file mode 100644
index 0000000..154cc11
--- /dev/null
+++ b/core/src/ch/asynk/zproject/screens/LoadingScreen.java
@@ -0,0 +1,171 @@
+package ch.asynk.zproject.screens;
+
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.Screen;
+import com.badlogic.gdx.graphics.GL20;
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.OrthographicCamera;
+import com.badlogic.gdx.graphics.g2d.SpriteBatch;
+import com.badlogic.gdx.graphics.g2d.TextureAtlas;
+import com.badlogic.gdx.graphics.g2d.TextureAtlas.AtlasRegion;
+
+import ch.asynk.zproject.ZProject;
+
+public class LoadingScreen implements Screen
+{
+    private final ZProject zproject;
+    private final SpriteBatch batch;
+    private final Color c;
+    private final OrthographicCamera camera;
+
+    private final float DELAY_AFTER = 1f;
+    private final float ALPHA_FACTOR = 1.5f;
+
+    private boolean paused;
+    private  TextureAtlas atlas;
+    private  AtlasRegion bar;
+    private  AtlasRegion border;
+    private  AtlasRegion loading;
+    private  AtlasRegion loaded;
+
+    private int x, y;
+    private float acc;
+    private float percent;
+    private float alpha;
+    private boolean incr;
+    private boolean isLoaded;
+
+    public interface LoadAction {
+        void call();
+    }
+    private LoadAction onLoaded;
+
+    public LoadingScreen(final ZProject zproject, LoadAction startLoading, LoadAction onLoaded)
+    {
+        this.zproject = zproject;
+        this.onLoaded = onLoaded;
+        this.batch = new SpriteBatch();
+        this.c = batch.getColor();
+        this.camera = new OrthographicCamera();
+        int w = Gdx.graphics.getWidth();
+        int h = Gdx.graphics.getHeight();
+        this.camera.setToOrtho(false, w, h);
+        this.camera.update();
+        this.paused = false;
+        atlas = zproject.assets.getAtlas(zproject.assets.LOADING);
+        bar = atlas.findRegion("bar");
+        border = atlas.findRegion("border");
+        loading = atlas.findRegion("loading");
+        loaded = atlas.findRegion("loaded");
+        computeCoords(w, h);
+        percent = 0f;
+        alpha = 1f;
+        incr = false;
+        isLoaded = false;
+        startLoading.call();
+    }
+
+    private void computeCoords(int width, int height)
+    {
+        x = (width - border.getRegionWidth()) / 2;
+        y = (height - border.getRegionHeight()) / 2;
+    }
+
+    @Override public void render(float delta)
+    {
+        if (paused) return;
+
+        percent = zproject.assets.getProgress();
+        if (!isLoaded && percent >= 1f) {
+            acc = 0f;
+            alpha = 1f;
+            incr = false;
+        }
+
+        if (isLoaded) {
+            acc += delta;
+            if (acc >= DELAY_AFTER) {
+                // FIXME callback
+                // zproject.switchToGame();
+                onLoaded.call();
+                return;
+            }
+        }
+
+        delta *= ALPHA_FACTOR;
+        if (incr) {
+            alpha += delta;
+            if (alpha >= 1f ) {
+                alpha = 1f;
+                incr = false;
+            }
+        } else {
+            alpha -= delta;
+            if (alpha <= 0f ) {
+                alpha = 0f;
+                incr = true;
+            }
+        }
+
+        if (!isLoaded) {
+            if (zproject.assets.update()) {
+                ZProject.debug("LoadingScreen", "assets loaded");
+                isLoaded = true;
+            }
+        }
+
+        Gdx.gl.glClearColor(0, 0, 0, 1);
+        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
+
+        batch.setProjectionMatrix(camera.combined);
+        batch.begin();
+        batch.setColor(c.r, c.g, c.b, 1f);
+        batch.draw(border, x, y);
+        batch.draw(bar, x + 4, y + 4, percent * bar.getRegionWidth(), bar.getRegionHeight());
+        batch.setColor(c.r, c.g, c.b, alpha);
+        if (!isLoaded) {
+            batch.draw(loading, x, y + border.getRegionHeight() + 3);
+        } else {
+            batch.draw(loaded, x + border.getRegionWidth() - loaded.getRegionWidth(), y - loaded.getRegionHeight() - 3);
+        }
+        batch.end();
+    }
+
+    @Override public void resize(int width, int height)
+    {
+        if (paused) return;
+        ZProject.debug("LoadingScreen", String.format("resize (%d,%d)",width, height));
+        this.camera.setToOrtho(false, width, height);
+        this.camera.update();
+        computeCoords(width, height);
+    }
+
+    @Override public void dispose()
+    {
+        ZProject.debug("LoadingScreen", "dispose()");
+        batch.dispose();
+    }
+
+    @Override public void show()
+    {
+        ZProject.debug("LoadingScreen", "show()");
+    }
+
+    @Override public void hide()
+    {
+        ZProject.debug("LoadingScreen", "hide()");
+    }
+
+    @Override public void pause()
+    {
+        paused = true;
+        ZProject.debug("pause() ");
+    }
+
+    @Override public void resume()
+    {
+        ZProject.debug("resume() ");
+        resize(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
+        paused = false;
+    }
+}