Android API开发之OpenGL开发之Android OpenGL显示STL模型文件

本文讲述用OpenGL显示STL模型文件。

STL模型文件：Android OpenGL STL详解

Android OpenGL初级开发：Android OpenGL之使用GLSurfaceView创建一个3D旋转的图形

1.Model.java

public class Model {
//三角面个数
private int facetCount;
//顶点坐标数组
private float[] verts;
//每个顶点对应的法向量数组
private float[] vnorms;
//每个三角面的属性信息
private short[] remarks;

//顶点数组转换而来的Buffer
private FloatBuffer vertBuffer;

//每个顶点对应的法向量转换而来的Buffer
private FloatBuffer vnormBuffer;
//以下分别保存所有点在x,y,z方向上的最大值、最小值
float maxX;
float minX;
float maxY;
float minY;
float maxZ;
float minZ;

//返回模型的中心点
public Point getCentrePoint() {
float cx = (maxX - minX) / 2;
float cy = (maxY - minY) / 2;
float cz = (maxZ - minZ) / 2;
return new Point(cx, cy, cz);
}

//包裹模型的最大半径
public float getR() {
float dx = (maxX - minX);
float dy = (maxY - minY);
float dz = (maxZ - minZ);
float max = dx;
if (dy > max)
max = dy;
if (dz > max)
max = dz;
return max;
}

public int getFacetCount() {
return facetCount;
}

public void setFacetCount(int facetCount) {
this.facetCount = facetCount;
}

public float[] getVerts() {
return verts;
}

public void setVerts(float[] verts) {
this.verts = verts;
vertBuffer = Util.floatToBuffer(verts);
}

public FloatBuffer getVertBuffer() {

return vertBuffer;
}

public FloatBuffer getVnormBuffer() {
return vnormBuffer;
}

public float[] getVnorms() {
return vnorms;
}

public void setVnorms(float[] vnorms) {
this.vnorms = vnorms;
vnormBuffer = Util.floatToBuffer(vnorms);
}

public short[] getRemarks() {
return remarks;
}

public void setRemarks(short[] remarks) {
this.remarks = remarks;
}

}

2.Point.java

public class Point {
public float x;
public float y;
public float z;

public Point(float x, float y, float z) {
this.x = x;
this.y = y;
this.z = z;

}

}

3.STLReader.java

public class STLReader {
private StlLoadListener stlLoadListener;

public Model parserBinStlInSDCard(String path)
throws IOException {

File file = new File(path);
FileInputStream fis = new FileInputStream(file);
return parserBinStl(fis);
}

public Model parserBinStlInAssets(Context context, String fileName)
throws IOException {

InputStream is = context.getAssets().open(fileName);
return parserBinStl(is);
}

public static interface StlLoadListener {
void onstart();

void onLoading(int cur, int total);

void onFinished();

void onFailure(Exception e);
}
}

4.OpenGLESActivity.java

public class OpenGLESActivity extends Activity {

private GLSurfaceView glView;
private float rotateDegreen = 0;
private GLRenderer glRenderer;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 如果本设备支持OpenGl ES 2.0
if (IsSupported()) {
glView = new GLSurfaceView(this);
glRenderer = new GLRenderer(this);
glView.setRenderer(glRenderer);
setContentView(glView);
}else{
Toast.makeText(OpenGLESActivity.this,"此设备不支持OpenGL ES 2.0！",Toast.LENGTH_LONG).show();
}
}

public void rotate(float degree) {
glRenderer.rotate(degree);
glView.invalidate();
}

private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
rotate(rotateDegreen);
}
};

/**
* 当前设备是否支持OpenGL ES 2.0
* */

private boolean IsSupported() {
ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();
boolean supportsEs2 = configurationInfo.reqGlEsVersion >= 0x20000
||(Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1 && (Build.FINGERPRINT.startsWith("generic")
|| Build.FINGERPRINT.startsWith("unknown")
|| Build.MODEL.contains("google_sdk")
|| Build.MODEL.contains("Emulator")
|| Build.MODEL.contains("Android SDK built for x86")));
return supportsEs2;
}

/**
* onPause方法 glSurfaceView.onPause
* */

@Override
protected void onPause() {
super.onPause();
if (glView != null) {
glView.onPause();
}
}

/**
* onResume方法 glSurfaceView.onResume
* */

@Override
protected void onResume() {
super.onResume();
if (glView != null) {
glView.onResume();

//不断改变rotateDegreen值，实现旋转
new Thread() {
@Override
public void run() {
while (true) {
try {
sleep(100);

rotateDegreen += 5;
handler.sendEmptyMessage(0x001);
} catch (Exception e) {
e.printStackTrace();
}

}
}
}.start();
}
}

}

5.结果

Demo下载：https://download.csdn.net/download/weixin_37730482/10449292

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