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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2016 Leszek Koltunski //
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// //
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// This file is part of Distorted. //
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// //
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// Distorted is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// Distorted is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with Distorted. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////////////////////
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package org.distorted.examples.flag;
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import android.content.Context;
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import android.opengl.GLSurfaceView;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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class FlagSurfaceView extends GLSurfaceView
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{
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private int mX, mY;
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private FlagRenderer mRenderer;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public FlagSurfaceView(Context c, AttributeSet attrs)
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{
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super(c,attrs);
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mX = -1;
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mY = -1;
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if(!isInEditMode())
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{
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setEGLContextClientVersion(2);
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mRenderer = new FlagRenderer(this);
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setRenderer(mRenderer);
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public FlagRenderer getRenderer()
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{
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return mRenderer;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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@Override public boolean onTouchEvent(MotionEvent event)
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{
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int action = event.getAction();
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int x = (int)event.getX();
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int y = (int)event.getY();
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switch(action)
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{
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case MotionEvent.ACTION_DOWN: mX = x;
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mY = y;
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break;
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case MotionEvent.ACTION_MOVE: if( mX>=0 && mY>= 0 )
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{
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float px = mY-y;
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float py = mX-x;
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float pz = 0;
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float plen = (float)Math.sqrt(px*px + py*py + pz*pz);
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if( plen>0 )
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{
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px /= plen;
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py /= plen;
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pz /= plen;
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float cosA = (float)Math.cos(plen*3.14f/mRenderer.mScreenMin);
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float sinA = (float)Math.sqrt(1-cosA*cosA);
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mRenderer.mQuat1.set(px*sinA, py*sinA, pz*sinA, cosA);
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}
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}
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break;
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case MotionEvent.ACTION_UP : mX = -1;
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mY = -1;
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float qx = mRenderer.mQuat1.getX();
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float qy = mRenderer.mQuat1.getY();
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float qz = mRenderer.mQuat1.getZ();
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float qw = mRenderer.mQuat1.getW();
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float rx = mRenderer.mQuat2.getX();
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float ry = mRenderer.mQuat2.getY();
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float rz = mRenderer.mQuat2.getZ();
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float rw = mRenderer.mQuat2.getW();
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// This is quaternion multiplication. (tx.ty.tz.tw)
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// is now equal to (qx,qy,qz,qw)*(rx,ry,rz,rw)
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float tx = rw*qx - rz*qy + ry*qz + rx*qw;
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float ty = rw*qy + rz*qx + ry*qw - rx*qz;
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float tz = rw*qz + rz*qw - ry*qx + rx*qy;
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float tw = rw*qw - rz*qz - ry*qy - rx*qx;
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// The point of this is so that there are always
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// exactly 2 quaternions: Quat1 representing the rotation
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// accumulating only since the last screen touch, and Quat2
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// which remembers the combined effect of all previous
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// swipes.
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// We cannot be accumulating an ever-growing list of quaternions
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// and add a new one every time user swipes the screen - there
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// is a limited number of slots in the EffectQueueMatrix!
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mRenderer.mQuat1.set(0f, 0f, 0f, 1f);
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mRenderer.mQuat2.set(tx, ty, tz, tw);
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break;
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}
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return true;
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}
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}
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