Sample code for OpenGL Android training class

( Original Id: Ib1650025a3c4b018c60d70ede3f25113660f68d8 )

Change-Id: I1d760b75d1f2bfe1ec90c71471867577bd146241

1 files changed, 82 insertions, 0 deletions

diff --git a/samples/OpenGL/HelloOpenGLES10/src/com/example/android/opengl/MyGLSurfaceView.java b/samples/OpenGL/HelloOpenGLES10/src/com/example/android/opengl/MyGLSurfaceView.java
new file mode 100644
index 000000000..e9b2c8c93
--- /dev/null
+++ b/samples/OpenGL/HelloOpenGLES10/src/com/example/android/opengl/MyGLSurfaceView.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.example.android.opengl;
+
+import android.content.Context;
+import android.opengl.GLSurfaceView;
+import android.view.MotionEvent;
+
+/**
+ * A view container where OpenGL ES graphics can be drawn on screen.
+ * This view can also be used to capture touch events, such as a user
+ * interacting with drawn objects.
+ */
+public class MyGLSurfaceView extends GLSurfaceView {
+
+    private final MyGLRenderer mRenderer;
+
+    public MyGLSurfaceView(Context context) {
+        super(context);
+
+        // Set the Renderer for drawing on the GLSurfaceView
+        mRenderer = new MyGLRenderer();
+        setRenderer(mRenderer);
+
+        // Render the view only when there is a change in the drawing data
+        setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
+    }
+
+    private final float TOUCH_SCALE_FACTOR = 180.0f / 320;
+    private float mPreviousX;
+    private float mPreviousY;
+
+    @Override
+    public boolean onTouchEvent(MotionEvent e) {
+        // MotionEvent reports input details from the touch screen
+        // and other input controls. In this case, we are only
+        // interested in events where the touch position changed.
+
+        float x = e.getX();
+        float y = e.getY();
+
+        switch (e.getAction()) {
+            case MotionEvent.ACTION_MOVE:
+
+                float dx = x - mPreviousX;
+                float dy = y - mPreviousY;
+
+                // reverse direction of rotation above the mid-line
+                if (y > getHeight() / 2) {
+                    dx = dx * -1 ;
+                }
+
+                // reverse direction of rotation to left of the mid-line
+                if (x < getWidth() / 2) {
+                    dy = dy * -1 ;
+                }
+
+                mRenderer.setAngle(
+                        mRenderer.getAngle() +
+                        ((dx + dy) * TOUCH_SCALE_FACTOR));  // = 180.0f / 320
+                requestRender();
+        }
+
+        mPreviousX = x;
+        mPreviousY = y;
+        return true;
+    }
+
+}