| /* |
| * 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; |
| } |
| |
| } |