Android程序研发源码Android 旋转的地球源码.rar

package com.renzh.earthtest; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.FloatBuffer; import java.nio.ShortBuffer; import javax.microedition.khronos.opengles.GL10; import javax.microedition.khronos.opengles.GL11; import android.opengl.GLU; /** * A sphere object representation. * */ public class Sphere { /* buffer holding vertex data */ private FloatBuffer mVertexBuffer; /* buffer holding index data */ private ShortBuffer mIndexBuffer; /* buffer holding texture coordinate data */ private FloatBuffer mUVBuffer; /* VBO for vertex */ private GLVBO mVertexVBO; /* VBO for index */ private GLVBO mIdxVBO; /* VBO for texture coordinates*/ private GLVBO mTexVBO; /* rows of the sphere grids */ private int rows; /* columns of the sphere grids */ private int cols; /* radius of the sphere */ private float radius; /* total points */ private int mCount; private float roatX=0,roatY=0; public float getRoatX() { return roatX; } public void setRoatX(float roatX) { this.roatX = roatX; } public float getRoatY() { return roatY; } public void setRoatY(float roatY) { this.roatY = roatY; } public Sphere(float radiu, int row, int col) { this.radius = radiu; this.rows = row; this.cols = col; mCount = (row + 1) * (col + 1); initBuffer(); build(); mVertexBuffer.position(0); mIndexBuffer.position(0); mUVBuffer.position(0); mVertexVBO = new GLVBO(GLVBO.VBO_VERTEX, mVertexBuffer); mIdxVBO = new GLVBO(GLVBO.VBO_INDEX, mIndexBuffer); mTexVBO = new GLVBO(GLVBO.VBO_TEXTURE, mUVBuffer); } /* initialize the buffers */ private void initBuffer() { mVertexBuffer = BufferFactory.createFloatBuffer(mCount * 3); mIndexBuffer = BufferFactory.createShortBuffer(rows * cols * 6); mUVBuffer = BufferFactory.createFloatBuffer(mCount * 2); } /* build the sphere */ private void build() { int r, c; Number3d n = new Number3d(); Number3d pos = new Number3d(); //类似二重积分，外面一层循环相当于在Z轴上由0 到PI上积分。n 这个点会绕z轴由0到PI渐变。 for (r = 0; r <= rows; r++) { float v = (float) r / (float) rows; // [0,1] //把纹理图片也按这个行列分割，v相当于这个纹理图片的第几行。当然总行数被认定为是1。 float theta1 = v * (float) Math.PI; // [0,PI] n.setAll(0, 1, 0); n.rotateZ(theta1); //内部循环相当于是在Y轴上由0到2*PI上渐变。这样在外重积分的基础上n这个点就会绕着Y轴由0到2*PI渐变。 //通过这二重积分 那么n这个点就会隔相同的间距遍历球体上的所有点。 当这个间距越小，遍历点就越多，越近似一个圆。 for (c = 0; c <= cols; c++) {//第一次循环就可以确定一个不能的点，所有的循环结束，这些不同的点就均匀的覆盖了球体。 float u = (float) c / (float) cols; // [0,1] float theta2 = u * (float) (Math.PI * 2);// [0,2*PI];//u相当于纹理图片的列。 pos.setAllFrom(n); pos.rotateY(theta2); pos.multiply(radius); mVertexBuffer.put(pos.x); mVertexBuffer.put(pos.y); mVertexBuffer.put(pos.z); mUVBuffer.put(u); mUVBuffer.put(v); } } //上面是rows+1行和cols+1列，这是因为球体是封闭的，多出的一行一列相当于闭合处，闭合片的点可以认为都重合了 //下面遍历不是到rows+1行和cols+1列止，这是因为下面是确定正方形，当到了第rows行时，正方形的底面已经是第rows+1行了。cols+1也是相当于在 //第rows列是正方形的右边已经到了cols+1列。 下面的构造有序正方形可以在图纸上模拟出来，确定很有序列。 int colLength = cols + 1; for (r = 0; r < rows; r++) { int offset = r * colLength; for (c = 0; c < cols; c++) {//每次循环会在风格上确定一个有序的正方形面。 int ul = offset + c; int ur = offset + c + 1; int br = offset + c + 1 + colLength; int bl = offset + c + colLength; //四个顶点可以确定一个正方形，不过在opengl中这个正方形要分两个三角形画出。 mIndexBuffer.put((short) ul); mIndexBuffer.put((short) br); mIndexBuffer.put((short) ur); mIndexBuffer.put((short) ul); mIndexBuffer.put((short) bl); mIndexBuffer.put((short) br); } } } public void release(){ mVertexVBO.release(); mIdxVBO.release(); mTexVBO.release(); } public void draw(GL11 gl, GLTexture tex1, GLTexture tex2, float u, float v) { if (tex1 != null) { gl.glActiveTexture(GL10.GL_TEXTURE0); gl.glClientActiveTexture(GL10.GL_TEXTURE0); gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); gl.glEnable(GL10.GL_TEXTURE_2D); tex1.bind(gl); mTexVBO.bind(gl); gl.glTexCoordPointer(2, GL11.GL_FLOAT, 0, 0); gl.glTexEnvf(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE, GL10.GL_MODULATE); } if (tex2 != null) { gl.glActiveTexture(GL10.GL_TEXTURE1); gl.glClientActiveTexture(GL10.GL_TEXTURE1); gl.glEnable(GL10.GL_TEXTURE_2D); gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); tex2.bind(gl); mTexVBO.bind(gl); gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, 0); gl.glTexEnvf(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE, GL10.GL_DECAL); if (u != 0 || v != 0) { gl.glMatrixMode(GL10.GL_TEXTURE); gl.glLoadIdentity(); gl.glTranslatef(u, v, 0); gl.glMatrixMode(GL10.GL_MODELVIEW); } } mVertexVBO.bind(gl); gl.glVertexPointer(3, GL11.GL_FLOAT, 0, 0); mIdxVBO.bind(gl); // initMaterialWhite(gl); //设置缓冲区，球面上的顶点法线向量与顶点坐标相同 gl.glNormalPointer(GL10.GL_FLOAT, 0, mVertexBuffer); gl.glRotatef(roatX, 1, 0, 0); gl.glRotatef(roatY, 0, 1, 0); gl.glDrawElements(GL11.GL_TRIANGLES, mIndexBuffer.capacity(),// GL10.GL_UNSIGNED_SHORT, 0); mIdxVBO.unBind(); mVertexVBO.unBind(); mTexVBO.unBind(); if (tex2 != null) { tex2.unBind(); gl.glActiveTexture(GL10.GL_TEXTURE1); gl.glMatrixMode(GL10.GL_TEXTURE); gl.glLoadIdentity(); gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glClientActiveTexture(GL10.GL_TEXTURE1); gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY); gl.glDisable(GL10.GL_TEXTURE_2D); } if (tex1 != null) { tex1.unBind(); gl.glActiveTexture(GL10.GL_TEXTURE0); gl.glClientActiveTexture(GL10.GL_TEXTURE0); gl.glMatrixMode(GL10.GL_TEXTURE); gl.glLoadIdentity(); gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glDisable(GL10.GL_TEXTURE_2D); } } /* * * 设置材质对于环境光，散射光，镜面光的反射能力，白色材质能反射所有光，其他的对应于自己的颜色*/ private void initMaterialWhite(GL10 gl){ float [] ambientMaterial = {0.4f,0.4f,0.4f,1.0f};//环境光位白色材质 gl.glMaterialfv(GL10.GL_FRONT_AND_BACK, GL10.GL_AMBIENT, ambientMaterial, 0); float [] diffuseMaterial = {0.8f,0.8f,0.8f,1.0f};//散射光为白色材质 gl.glMaterialfv(GL10.GL_FRONT_AND_BACK, GL10.GL_DIFFUSE, diffuseMaterial, 0); float [] specularMaterial = {1.0f,1f,1f,1.0f};//高光材质为白色 gl.glMaterialfv(GL10.GL_FRONT_AND_BACK, GL10.GL_SPECULAR, specularMaterial, 0); float []shininessMaterial = {1.5f};//高光反射区域，数越大高亮区域越小，越暗 gl.glMaterialfv(GL10.GL_FRONT_AND_BACK, GL10.GL_SHININESS, shininessMaterial, 0); float []emission = {0.0f,0.0f,1f,1.0f};//蓝色自发光，开启这个后，球体会自身发出蓝色光 gl.glMaterialfv(GL10.GL_FRONT_AND_BACK, GL10.GL_EMISSION, emission, 0); float LightAmbient[]={0.5f,0.5f,0.5f,1.0f}; // 环境光的值。 float LighDiffuse[]={1.0f,1.0f,1.0f,1.0f}; //散射光的值。 float LightPosition[]={0.0f,0.0f,1.0f,1.0f}; //光照位置。 gl.glLightfv(GL10.GL_LIGHT0,GL10.GL_AMBIENT,LightAmbient,0);// 设置环境光源。 gl.glLightfv(GL10.GL_LIGHT0,GL10.GL_DIFFUSE,LighDiffuse,0);// 设置漫反射光源。 gl.glLightfv(GL10.GL_LIGHT0,GL10.GL_POSITION,LightPosition,0);// 设置光源位置。 gl.glEnable(GL10.GL_LIGHTING); // gl.glEnable(GL10.GL_LIGHT0); } }