Create an abstract class to challenge friends (#10)

core/src/io/github/lonamiwebs/klooni/ShareChallenge.java

@@ -0,0 +1,87 @@
+package io.github.lonamiwebs.klooni;
+
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.files.FileHandle;
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.GL20;
+import com.badlogic.gdx.graphics.Pixmap;
+import com.badlogic.gdx.graphics.PixmapIO;
+import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.graphics.g2d.BitmapFont;
+import com.badlogic.gdx.graphics.g2d.SpriteBatch;
+import com.badlogic.gdx.graphics.glutils.FrameBuffer;
+import com.badlogic.gdx.math.Matrix4;
+import com.badlogic.gdx.scenes.scene2d.ui.Label;
+import com.badlogic.gdx.utils.BufferUtils;
+import com.badlogic.gdx.utils.ScreenUtils;
+
+import java.io.File;
+
+public abstract class ShareChallenge {
+
+    // Meant to return the file path to which the image will be saved
+    // On some platforms it might be as simple as Gdx.files.local().file()
+    abstract File getShareImageFilePath();
+
+    // Meant to share the saved screenshot at getShareImageFilePath()
+    public abstract void shareScreenshot(final boolean saveResult);
+
+    // Saves the "Challenge me" shareable image to getShareImageFilePath()
+    public boolean saveChallengeImage(final int score) {
+        final File saveAt = getShareImageFilePath();
+        if (!saveAt.getParentFile().isDirectory())
+            if (!saveAt.mkdirs())
+                return false;
+
+        final FileHandle output = new FileHandle(saveAt);
+
+        final Texture shareBase = new Texture(Gdx.files.internal("share.png"));
+        final int width = shareBase.getWidth();
+        final int height = shareBase.getHeight();
+
+        final FrameBuffer frameBuffer = new FrameBuffer(Pixmap.Format.RGB888, width, height, false);
+        frameBuffer.begin();
+
+        // Render the base share texture
+        final SpriteBatch batch = new SpriteBatch();
+        final Matrix4 matrix = new Matrix4();
+        matrix.setToOrtho2D(0, 0, width, height);
+        batch.setProjectionMatrix(matrix);
+
+        Gdx.gl.glClearColor(Color.GOLD.r, Color.GOLD.g, Color.GOLD.b, 1);
+        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
+
+        batch.begin();
+        batch.draw(shareBase, 0, 0);
+
+        // Render the achieved score
+        final Label.LabelStyle style = new Label.LabelStyle();
+        style.font = new BitmapFont(Gdx.files.internal("font/x1.0/geosans-light64.fnt"));
+        Label label = new Label("just scored " + score + " on", style);
+        label.setColor(Color.BLACK);
+        label.setPosition(40, 500);
+        label.draw(batch, 1);
+
+        label.setText("try to beat me if you can");
+        label.setPosition(40, 40);
+        label.draw(batch, 1);
+
+        batch.end();
+
+        // Get the framebuffer pixels and write them to a local file
+        final byte[] pixels = ScreenUtils.getFrameBufferPixels(0, 0, width, height, true);
+
+        final Pixmap pixmap = new Pixmap(width, height, Pixmap.Format.RGBA8888);
+
+        BufferUtils.copy(pixels, 0, pixmap.getPixels(), pixels.length);
+        PixmapIO.writePNG(output, pixmap);
+
+        // Dispose everything
+        pixmap.dispose();
+        shareBase.dispose();
+        batch.dispose();
+        frameBuffer.end();
+
+        return true;
+    }
+}