195 lines
7.0 KiB
Java
195 lines
7.0 KiB
Java
package com.bn.planeModel;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.FloatBuffer;
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import java.util.ArrayList;
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import android.opengl.GLES20;
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import com.bn.core.MatrixState;
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/*
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* 创建椭球体类 顶点和纹理
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* 用于绘制机身,机头和机舱
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*/
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public class DrawSpheroid
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{
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int mProgram;//自定义渲染管线着色器程序id
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int muMVPMatrixHandle;//总变换矩阵引用id
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int maPositionHandle; //顶点位置属性引用id
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int maTexCoorHandle; //顶点纹理坐标属性引用id
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String mVertexShader;//顶点着色器代码脚本
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String mFragmentShader;//片元着色器代码脚本
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private FloatBuffer mVertexBuffer;//顶点坐标数据缓冲
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private FloatBuffer mTextureBuffer;//纹理缓冲
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public float mAngleX;//沿x轴旋转角度
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public float mAngleY;//沿y轴旋转角度
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public float mAngleZ;//沿z轴旋转角度
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int vCount=0;
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float a;
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float b; //三轴半径长
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float c;
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float angleSpan;//将球进行单位切分的角度
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float hAngleBegin;//经度绘制起始角度
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float hAngleOver;//经度绘制结束角度
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float vAngleBegin;//纬度绘制起始角度
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float vAngleOver;//纬度绘制结束角度
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//hAngle表示经度，vAngle表示纬度。
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public DrawSpheroid(float a,float b,float c,float angleSpan,
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float hAngleBegin,float hAngleOver,float vAngleBegin,float vAngleOver,int mProgram)
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{
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this.a=a;
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this.b=b;
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this.c=c;
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this.hAngleBegin=hAngleBegin;
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this.hAngleOver=hAngleOver;
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this.vAngleBegin=vAngleBegin;
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this.vAngleOver=vAngleOver;
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this.mProgram=mProgram;
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this.angleSpan=angleSpan;
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initVertexData();
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initShader();
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}
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//初始化顶点的信息
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public void initVertexData()
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{
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ArrayList<Float> alVertix=new ArrayList<Float>();//存放顶点坐标
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for(float vAngle=vAngleBegin;vAngle<vAngleOver;vAngle=vAngle+angleSpan)//垂直方向angleSpan度一份
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{
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for(float hAngle=hAngleBegin;hAngle<hAngleOver;hAngle=hAngle+angleSpan)//水平方向angleSpan度一份
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{//纵向横向各到一个角度后计算对应的此点在球面上的坐标
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float x1=(float)(a*Math.cos(Math.toRadians(vAngle))*Math.cos(Math.toRadians(hAngle)));
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float y1=(float)(b*Math.cos(Math.toRadians(vAngle))*Math.sin(Math.toRadians(hAngle)));
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float z1=(float)(c*Math.sin(Math.toRadians(vAngle)));
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float x2=(float)(a*Math.cos(Math.toRadians(vAngle+angleSpan))*Math.cos(Math.toRadians(hAngle)));
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float y2=(float)(b*Math.cos(Math.toRadians(vAngle+angleSpan))*Math.sin(Math.toRadians(hAngle)));
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float z2=(float)(c*Math.sin(Math.toRadians(vAngle+angleSpan)));
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float x3=(float)(a*Math.cos(Math.toRadians(vAngle+angleSpan))*Math.cos(Math.toRadians(hAngle+angleSpan)));
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float y3=(float)(b*Math.cos(Math.toRadians(vAngle+angleSpan))*Math.sin(Math.toRadians(hAngle+angleSpan)));
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float z3=(float)(c*Math.sin(Math.toRadians(vAngle+angleSpan)));
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float x4=(float)(a*Math.cos(Math.toRadians(vAngle))*Math.cos(Math.toRadians(hAngle+angleSpan)));
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float y4=(float)(b*Math.cos(Math.toRadians(vAngle))*Math.sin(Math.toRadians(hAngle+angleSpan)));
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float z4=(float)(c*Math.sin(Math.toRadians(vAngle)));
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//将计算出来的XYZ坐标加入存放顶点坐标的ArrayList
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alVertix.add(x1);alVertix.add(y1);alVertix.add(z1);
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alVertix.add(x2);alVertix.add(y2);alVertix.add(z2);
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alVertix.add(x4);alVertix.add(y4);alVertix.add(z4);
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alVertix.add(x4);alVertix.add(y4);alVertix.add(z4);
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alVertix.add(x2);alVertix.add(y2);alVertix.add(z2);
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alVertix.add(x3);alVertix.add(y3);alVertix.add(z3);
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}
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}
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vCount=alVertix.size()/3;//顶点的数量为坐标值数量的1/3，因为一个顶点有3个坐标
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//将alVertix中的坐标值转存到一个int数组中
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float[] vertices=new float[vCount*3];
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for(int i=0;i<alVertix.size();i++)
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{
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vertices[i]=alVertix.get(i);
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}
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ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length*4);
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vbb.order(ByteOrder.nativeOrder());//设置字节顺序为本地操作系统顺序
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mVertexBuffer = vbb.asFloatBuffer();//转换为int型缓冲
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mVertexBuffer.put(vertices);//向缓冲区中放入顶点坐标数据
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mVertexBuffer.position(0);//设置缓冲区起始位置
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//纹理
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//获取切分整图的纹理数组
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float[] texCoorArray=
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generateTexCoor
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(
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(int)(180/angleSpan), //纹理图切分的列数
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(int)(180/angleSpan) //纹理图切分的行数
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);
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ByteBuffer tbb=ByteBuffer.allocateDirect(texCoorArray.length*4);
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tbb.order(ByteOrder.nativeOrder());
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mTextureBuffer=tbb.asFloatBuffer();
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mTextureBuffer.put(texCoorArray);
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mTextureBuffer.position(0);
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}
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//初始化着色器的initShader方法
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public void initShader()
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{
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//获取程序中顶点位置属性引用id
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maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
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//获取程序中顶点纹理坐标属性引用id
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maTexCoorHandle= GLES20.glGetAttribLocation(mProgram, "aTexCoor");
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//获取程序中总变换矩阵引用id
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muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
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}
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public void drawSelf(int texId)
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{
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MatrixState.pushMatrix();
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MatrixState.rotate(mAngleX, 1, 0, 0);
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MatrixState.rotate(mAngleY, 0, 1, 0);
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MatrixState.rotate(mAngleZ, 0, 0, 1);
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//制定使用某套shader程序
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GLES20.glUseProgram(mProgram);
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//将最终变换矩阵传入shader程序
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GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, MatrixState.getFinalMatrix(), 0);
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//传入顶点位置数据
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GLES20.glVertexAttribPointer
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(
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maPositionHandle,
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3,
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GLES20.GL_FLOAT,
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false,
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3*4,
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mVertexBuffer
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);
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//传入顶点纹理坐标数据
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GLES20.glVertexAttribPointer
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(
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maTexCoorHandle,
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2,
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GLES20.GL_FLOAT,
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false,
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2*4,
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mTextureBuffer
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);
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//允许顶点位置数据数组
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GLES20.glEnableVertexAttribArray(maPositionHandle);
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GLES20.glEnableVertexAttribArray(maTexCoorHandle);
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//绑定纹理
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GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
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GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texId);
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//绘制纹理矩形
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GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, vCount);
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MatrixState.popMatrix();
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}
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//自动切分纹理产生纹理数组的方法
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public float[] generateTexCoor(int bw,int bh)
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{
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float[] result=new float[bw*bh*6*2];
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float sizew=1.0f/bw;//列数
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float sizeh=1.0f/bh;//行数
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int c=0;
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for(int i=0;i<bh;i++)
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{
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for(int j=0;j<bw;j++)
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{
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//每行列一个矩形，由两个三角形构成，共六个点，12个纹理坐标
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float s=j*sizew;
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float t=i*sizeh;
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result[c++]=s;
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result[c++]=t;
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result[c++]=s;
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result[c++]=t+sizeh;
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result[c++]=s+sizew;
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result[c++]=t;
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result[c++]=s+sizew;
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result[c++]=t;
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result[c++]=s;
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result[c++]=t+sizeh;
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result[c++]=s+sizew;
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result[c++]=t+sizeh;
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}
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}
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return result;
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}
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}
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