gpt4 book ai didi

android - 如何用手指移动 OpenGL 正方形?

转载 作者:塔克拉玛干 更新时间:2023-11-02 22:22:56 27 4
gpt4 key购买 nike

实际上,我有一个适用于 Android 1.5 的应用程序,其中包含一个 GLSurfaceView 类,它在屏幕上显示一个简单的方形多边形。

我想学习如何添加一个新功能,即移动用手指触摸的方 block 的功能。我的意思是当用户触摸方 block 并移动手指时,方 block 应该粘在手指上,直到手指松开屏幕。

我们将不胜感激任何教程/代码示例/帮助。

我的代码:

public class MySurfaceView extends GLSurfaceView implements Renderer {  
private Context context;
private Square square;
private float xrot; //X Rotation
private float yrot; //Y Rotation
private float zrot; //Z Rotation
private float xspeed; //X Rotation Speed
private float yspeed; //Y Rotation Speed
private float z = -1.15f; //Profundidad en el eje Z
private float oldX; //valor anterior de X, para rotación
private float oldY; //valor anterior de Y, para rotación
private final float TOUCH_SCALE = 0.2f; //necesario para la rotación

//create the matrix grabber object in your initialization code
private MatrixGrabber mg = new MatrixGrabber();

private boolean firstTimeDone=false; //true si la aplicación ya ha sido inicializada.

public MySurfaceView(Context context, Bitmap image) {
super(context);
this.context = context;
setEGLConfigChooser(8, 8, 8, 8, 16, 0); //fondo transparente
getHolder().setFormat(PixelFormat.TRANSLUCENT); //fondo transparente
//Transformamos esta clase en renderizadora
this.setRenderer(this);
//Request focus, para que los botones reaccionen
this.requestFocus();
this.setFocusableInTouchMode(true);
square = new Square(image);
}

public void onSurfaceCreated(GL10 gl, EGLConfig config) {
gl.glDisable(GL10.GL_DITHER); //dithering OFF
gl.glEnable(GL10.GL_TEXTURE_2D); //Texture Mapping ON
gl.glShadeModel(GL10.GL_SMOOTH); //Smooth Shading
gl.glClearDepthf(1.0f); //Depth Buffer Setup
gl.glEnable(GL10.GL_DEPTH_TEST); //Depth Testing ON
gl.glDepthFunc(GL10.GL_LEQUAL);
gl.glClearColor(0,0,0,0); //fondo transparente
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);
//Cargamos la textura del cubo.
square.loadGLTexture(gl, this.context);
}

public void onDrawFrame(GL10 gl) {
//Limpiamos pantalla y Depth Buffer
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();
//Dibujado
gl.glTranslatef(0.0f, 0.0f, z); //Move z units into the screen
gl.glScalef(0.8f, 0.8f, 0.8f); //Escalamos para que quepa en la pantalla
//Rotamos sobre los ejes.
gl.glRotatef(xrot, 1.0f, 0.0f, 0.0f); //X
gl.glRotatef(yrot, 0.0f, 1.0f, 0.0f); //Y
gl.glRotatef(zrot, 0.0f, 0.0f, 1.0f); //Z
//Dibujamos el cuadrado
square.draw(gl);
//Factores de rotación.
xrot += xspeed;
yrot += yspeed;


if (!firstTimeDone)
{
/////////////// NEW CODE FOR SCALING THE AR IMAGE TO THE DESIRED WIDTH /////////////////
mg.getCurrentProjection(gl);
mg.getCurrentModelView(gl);
float [] modelMatrix = new float[16];
float [] projMatrix = new float[16];
modelMatrix=mg.mModelView;
projMatrix=mg.mProjection;
int [] mView = new int[4];
mView[0] = 0;
mView[1] = 0;
mView[2] = 800; //width
mView[3] = 480; //height
float [] outputCoords = new float[3];
GLU.gluProject(-1.0f, -1.0f, z, modelMatrix, 0, projMatrix, 0, mView, 0, outputCoords, 0);

int i=0;
System.out.print(i);
// firstTimeDone=true;
}
}

//si el surface cambia, resetea la vista, imagino que esto pasa cuando cambias de modo portrait/landscape o sacas el teclado físico en móviles tipo Droid.
public void onSurfaceChanged(GL10 gl, int width, int height) {
if(height == 0) {
height = 1;
}
gl.glViewport(0, 0, width, height); //Reset Viewport
gl.glMatrixMode(GL10.GL_PROJECTION); //Select Projection Matrix
gl.glLoadIdentity(); //Reset Projection Matrix
//Aspect Ratio de la ventana
GLU.gluPerspective(gl, 45.0f, (float)width / (float)height, 0.1f, 100.0f);
gl.glMatrixMode(GL10.GL_MODELVIEW); //Select Modelview Matrix
gl.glLoadIdentity(); //Reset Modelview Matrix

}

public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction())
{
case MotionEvent.ACTION_MOVE:
//Calculamos el cambio
float dx = x - oldX;
float dy = y - oldY;
xrot += dy * TOUCH_SCALE;
yrot += dx * TOUCH_SCALE;
//Log.w("XXXXXX", "ACTION_MOVE_NO_ZOOM");
break;
}
oldX = x;
oldY = y;
return true; //El evento ha sido manejado
}

public void zoomIn(){
z=z+0.2f;
if (z>-1.0f)
z=-1.0f;
}
public void zoomOut(){
z=z-0.2f;
if (z<-20.0f)
z=-20.0f;
}
public void rotateL(){
zrot=zrot+3.0f;
}
public void rotateR(){
zrot=zrot-3.0f;
}
public void reset()
{
xrot=0;
yrot=0;
zrot=0;
xspeed=0;
yspeed=0;
z = -5.0f;
}
}

这是我的方形类:

public class Square {
//Buffer de vertices
private FloatBuffer vertexBuffer;
//Buffer de coordenadas de texturas
private FloatBuffer textureBuffer;
//Puntero de texturas
private int[] textures = new int[3];
//El item a representar
private Bitmap image;
//Definición de vertices

private float vertices[] =
{
-1.0f, -1.0f, 0.0f, //Bottom Left
1.0f, -1.0f, 0.0f, //Bottom Right
-1.0f, 1.0f, 0.0f, //Top Left
1.0f, 1.0f, 0.0f //Top Right
};
/*
private float vertices[] =
{
-0.8f, -0.8f, 0.0f, //Bottom Left
0.8f, -0.8f, 0.0f, //Bottom Right
-0.8f, 0.8f, 0.0f, //Top Left
0.8f, 0.8f, 0.0f
};
*/
//Coordenadas (u, v) de las texturas
/*
private float texture[] =
{
//Mapping coordinates for the vertices
0.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
1.0f, 1.0f
};
*/
private float texture[] =
{
//Mapping coordinates for the vertices
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f
};
//Inicializamos los buffers
public Square(Bitmap image) {
ByteBuffer byteBuf = ByteBuffer.allocateDirect(vertices.length * 4);
byteBuf.order(ByteOrder.nativeOrder());
vertexBuffer = byteBuf.asFloatBuffer();
vertexBuffer.put(vertices);
vertexBuffer.position(0);

byteBuf = ByteBuffer.allocateDirect(texture.length * 4);
byteBuf.order(ByteOrder.nativeOrder());
textureBuffer = byteBuf.asFloatBuffer();
textureBuffer.put(texture);
textureBuffer.position(0);

this.image=image;
}
//Funcion de dibujado
public void draw(GL10 gl) {
gl.glFrontFace(GL10.GL_CCW);
//gl.glEnable(GL10.GL_BLEND);
//Bind our only previously generated texture in this case
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
//Point to our vertex buffer
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, textureBuffer);
//Enable vertex buffer
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
//Draw the vertices as triangle strip
gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, vertices.length / 3);
//Disable the client state before leaving
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
//gl.glDisable(GL10.GL_BLEND);
}
//Carga de texturas
public void loadGLTexture(GL10 gl, Context context) {
//Generamos un puntero de texturas
gl.glGenTextures(1, textures, 0);
//y se lo asignamos a nuestro array
gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[0]);
//Creamos filtros de texturas
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
//Diferentes parametros de textura posibles GL10.GL_CLAMP_TO_EDGE
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_REPEAT);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_REPEAT);
/*
String imagePath = "radiocd5.png";
AssetManager mngr = context.getAssets();
InputStream is=null;
try {
is = mngr.open(imagePath);
} catch (IOException e1) { e1.printStackTrace(); }
*/
//Get the texture from the Android resource directory
InputStream is=null;
/*
if (item.equals("rim"))
is = context.getResources().openRawResource(R.drawable.rueda);
else if (item.equals("selector"))
is = context.getResources().openRawResource(R.drawable.selector);
*/
/*
is = context.getResources().openRawResource(resourceId);
Bitmap bitmap = null;
try {
bitmap = BitmapFactory.decodeStream(is);
} finally {
try {
is.close();
is = null;
} catch (IOException e) {
}
}
*/
Bitmap bitmap =image;
//con el siguiente código redimensionamos las imágenes que sean mas grandes de 256x256.
int newW=bitmap.getWidth();
int newH=bitmap.getHeight();
float fact;
if (newH>256 || newW>256)
{
if (newH>256)
{
fact=(float)255/(float)newH; //porcentaje por el que multiplicar para ser tamaño 256
newH=(int)(newH*fact); //altura reducida al porcentaje necesario
newW=(int)(newW*fact); //anchura reducida al porcentaje necesario
}
if (newW>256)
{
fact=(float)255/(float)newW; //porcentaje por el que multiplicar para ser tamaño 256
newH=(int)(newH*fact); //altura reducida al porcentaje necesario
newW=(int)(newW*fact); //anchura reducida al porcentaje necesario
}
bitmap=Bitmap.createScaledBitmap(bitmap, newW, newH, true);
}
//con el siguiente código transformamos imágenes no potencia de 2 en imágenes potencia de 2 (pot)
//meto el bitmap NOPOT en un bitmap POT para que no aparezcan texturas blancas.
int nextPot=256;
int h = bitmap.getHeight();
int w = bitmap.getWidth();
int offx=(nextPot-w)/2; //distancia respecto a la izquierda, para que la imagen quede centrada en la nueva imagen POT
int offy=(nextPot-h)/2; //distancia respecto a arriba, para que la imagen quede centrada en la nueva imagen POT
Bitmap bitmap2 = Bitmap.createBitmap(nextPot, nextPot, Bitmap.Config.ARGB_8888); //crea un bitmap transparente gracias al ARGB_8888
Canvas comboImage = new Canvas(bitmap2);
comboImage.drawBitmap(bitmap, offx, offy, null);
comboImage.save();

//Usamos Android GLUtils para espcificar una textura de 2 dimensiones para nuestro bitmap
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap2, 0);

//Checkeamos si el GL context es versión 1.1 y generamos los Mipmaps por Flag. Si no, llamamos a nuestra propia implementación
if(gl instanceof GL11) {
gl.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_GENERATE_MIPMAP, GL11.GL_TRUE);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap2, 0);
} else {
buildMipmap(gl, bitmap2);
}
//Limpiamos los bitmaps
bitmap.recycle();
bitmap2.recycle();
}
//Nuestra implementación de MipMap. Escalamos el bitmap original hacia abajo por factor de 2 y lo asignamos como nuevo nivel de mipmap
private void buildMipmap(GL10 gl, Bitmap bitmap) {
int level = 0;
int height = bitmap.getHeight();
int width = bitmap.getWidth();
while(height >= 1 || width >= 1) {
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, level, bitmap, 0);
if(height == 1 || width == 1) {
break;
}
level++;
height /= 2;
width /= 2;
Bitmap bitmap2 = Bitmap.createScaledBitmap(bitmap, width, height, true);
bitmap.recycle();
bitmap = bitmap2;
}
}
}

最佳答案

你看过Android教程代码了吗?他们在 OpenGL ES 1 和 2 中有一些与此非常相似的示例。

在 OpenGL ES 1 教程中,有一节专门用于处理触摸事件。 http://developer.android.com/resources/tutorials/opengl/opengl-es10.html#touch

所以你想将 AddMotion 部分从 glrotatef 命令修改为 gltranslatef;

编辑

看起来您对坐标转换比对象选择更感兴趣。因此,无论您在屏幕上触摸何处,图像都会到达那里(与触摸和拖动图像相反,这意味着选择)。你关于 winZ 的问题让我觉得你正在尝试 gluunproject。如果是这种情况,您已经知道您的 winZ,因为您通过“z”变量将相机从对象平移回来。既然你的 z 是负数,为什么不试试这个呢?

假设您已经在 Activity 中为 GLSurfaceView 设置了 GLWrapper:

    mGLView.setGLWrapper(new GLWrapper() {
public GL wrap(GL gl) {
return new MatrixTrackingGL(gl);
}

});

然后,在您的 GLSurfaceView/Renderer 子类中...

public float[] unproject(GL10 gl, float x, float y) {
mMatrixGrabber.getCurrentState(gl);
int[] view = {0,0,this.getWidth(), this.getHeight()};
float[] pos = new float[4];
float[] result = null;
int retval = GLU.gluUnProject(x, y, -z,
mMatrixGrabber.mModelView, 0,
mMatrixGrabber.mProjection, 0,
view, 0,
pos, 0);
if (retval != GL10.GL_TRUE) {
Log.e("unproject", GLU.gluErrorString(retval));
} else {
result = new float[3];
result[0] = pos[0] / pos[3];
result[1] = pos[1] / pos[3];
result[2] = pos[2] / pos[3];
result = pos;
}
return result;
}

然后您可以修改您的 TouchEvent 处理程序以包含

    switch (event.getAction()) 
{
case MotionEvent.ACTION_MOVE:
//Calculamos el cambio
float dx = x - oldX;
float dy = y - oldY;
xrot += dy * TOUCH_SCALE;
yrot += dx * TOUCH_SCALE;
//Log.w("XXXXXX", "ACTION_MOVE_NO_ZOOM");
touching = true;
break;
case MotionEvent.ACTION_UP:
xrot = 0;
yrot = 0;
zrot = 0;
touching = false;
break;
}

并在其他平移/缩放/旋转调用之前将下一部分放在绘制方法中:

    if (touching) {
float[] point = unproject(gl, oldX, (this.getHeight() - oldY));
if (point == null) {
Log.e("Draw", "No Point");
} else {
gl.glTranslatef(point[0], point[1], 0);
}
}

希望这能给您带来您想要的结果。

关于android - 如何用手指移动 OpenGL 正方形?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8010971/

27 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com