搜索
首页php教程php手册【Android】第3章（25）示例24--OpenGL绘制功能

【Android】第3章（25）示例24--OpenGL绘制功能

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
Jul 06, 2016 pm 01:30 PM
android功能示例绘制

分类：C#、Android、VS2015、百度地图应用； 创建日期：2016-02-04 一、简介 百度地图SDK为广大开发者开放了OpenGL绘制接口，帮助开发者在地图上实现更灵活的样式绘制，丰富地图使用效果体验。 二、运行截图 简介：介绍如何使用OpenGL在地图上实现自定义绘制

分类：C#、Android、VS2015、百度地图应用； 创建日期：2016-02-04

一、简介

百度地图SDK为广大开发者开放了OpenGL绘制接口，帮助开发者在地图上实现更灵活的样式绘制，丰富地图使用效果体验。

 

二、运行截图

简介：介绍如何使用OpenGL在地图上实现自定义绘制。

详述：

（1）利用OpenGL绘制基本折线；

（2）利用OpenGL在地图上进行纹理绘制；

本示例运行截图如下：

image

三、设计步骤

1、添加demo24_opengl.xml文件

在layout文件夹下添加该文件，然后将代码改为下面的内容：

<span style="color: #0000ff;"></span><span style="color: #ff00ff;">xml version="1.0" encoding="utf-8"</span><span style="color: #0000ff;">?></span>
<span style="color: #0000ff;"><span style="color: #800000;">RelativeLayout </span><span style="color: #ff0000;">xmlns:android</span><span style="color: #0000ff;">="http://schemas.android.com/apk/res/android"</span><span style="color: #ff0000;">
    android:layout_width</span><span style="color: #0000ff;">="fill_parent"</span><span style="color: #ff0000;">
    android:layout_height</span><span style="color: #0000ff;">="fill_parent"</span><span style="color: #ff0000;">
    android:orientation</span><span style="color: #0000ff;">="vertical"</span> <span style="color: #0000ff;">></span>
  <span style="color: #0000ff;"><span style="color: #800000;">com.baidu.mapapi.map.TextureMapView
      </span><span style="color: #ff0000;">android:id</span><span style="color: #0000ff;">="@+id/bmapView"</span><span style="color: #ff0000;">
      android:layout_width</span><span style="color: #0000ff;">="match_parent"</span><span style="color: #ff0000;">
      android:layout_height</span><span style="color: #0000ff;">="fill_parent"</span> <span style="color: #0000ff;">/></span>
<span style="color: #0000ff;"></span><span style="color: #800000;">RelativeLayout</span><span style="color: #0000ff;">></span></span></span>

2、添加Demo24OpenGL.cs文件

在SrcSdkDemos文件夹下添加该文件，然后将代码改为下面的内容：

<span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.App;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.OS;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Com.Baidu.Mapapi.Map;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Com.Baidu.Mapapi.Model;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.Graphics;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.Util;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> System.Collections.Generic;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> javax.Microedition.Khronos.Opengles;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Java.Nio;
</span><span style="color: #0000ff;">using</span><span style="color: #000000;"> Android.Opengl;

</span><span style="color: #0000ff;">namespace</span><span style="color: #000000;"> BdMapV371Demos.SrcSdkDemos
{
    </span><span style="color: #808080;">///</span> <span style="color: #808080;"><summary></summary></span>
    <span style="color: #808080;">///</span><span style="color: #008000;"> 此demo用来展示如何在地图绘制的每帧中再额外绘制一些用户自己的内容
    </span><span style="color: #808080;">///</span> <span style="color: #808080;"></span>
    [Activity(Label = <span style="color: #800000;">"</span><span style="color: #800000;">@string/demo_name_opengl</span><span style="color: #800000;">"</span><span style="color: #000000;">)]
    </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> Demo24OpenGL : Activity, BaiduMap.IOnMapDrawFrameCallback
    {
        </span><span style="color: #008000;">//</span><span style="color: #008000;"> 地图相关</span>
        <span style="color: #0000ff;">PRivate</span><span style="color: #000000;"> TextureMapView mMapView;
        </span><span style="color: #0000ff;">private</span><span style="color: #000000;"> BaiduMap mBaiduMap;
        </span><span style="color: #0000ff;">private</span><span style="color: #000000;"> Bitmap bitmap;
        </span><span style="color: #0000ff;">private</span> LatLng latlng1 = <span style="color: #0000ff;">new</span> LatLng(<span style="color: #800080;">39.97923</span>, <span style="color: #800080;">116.357428</span><span style="color: #000000;">);
        </span><span style="color: #0000ff;">private</span> LatLng latlng2 = <span style="color: #0000ff;">new</span> LatLng(<span style="color: #800080;">39.94923</span>, <span style="color: #800080;">116.397428</span><span style="color: #000000;">);
        </span><span style="color: #0000ff;">private</span> LatLng latlng3 = <span style="color: #0000ff;">new</span> LatLng(<span style="color: #800080;">39.96923</span>, <span style="color: #800080;">116.437428</span><span style="color: #000000;">);
        </span><span style="color: #0000ff;">private</span> IList<latlng><span style="color: #000000;"> latLngPolygon;
        </span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">float</span><span style="color: #000000;">[] vertexs;
        </span><span style="color: #0000ff;">private</span><span style="color: #000000;"> FloatBuffer vertexBuffer;
        </span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">int</span> textureId = -<span style="color: #800080;">1</span><span style="color: #000000;">;
        </span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">readonly</span> <span style="color: #0000ff;">string</span> LTAG = <span style="color: #800000;">"</span><span style="color: #800000;">Demo24OpenGL</span><span style="color: #800000;">"</span><span style="color: #000000;">;

        </span><span style="color: #0000ff;">protected</span> <span style="color: #0000ff;">override</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnCreate(Bundle savedInstanceState)
        {
            </span><span style="color: #0000ff;">base</span><span style="color: #000000;">.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.demo24_opengl);
            mMapView </span>= FindViewById<texturemapview><span style="color: #000000;">(Resource.Id.bmapView);
            mBaiduMap </span>=<span style="color: #000000;"> mMapView.Map;
            latLngPolygon </span>= <span style="color: #0000ff;">new</span> List<latlng><span style="color: #000000;">()
            {
                latlng1,latlng2,latlng3
            };
            mBaiduMap.SetOnMapDrawFrameCallback(</span><span style="color: #0000ff;">this</span><span style="color: #000000;">);
            bitmap </span>=<span style="color: #000000;"> BitmapFactory.DecodeResource(Resources,
                Resource.Drawable.ground_overlay);
        }

        </span><span style="color: #0000ff;">protected</span> <span style="color: #0000ff;">override</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnPause()
        {
            mMapView.OnPause();
            </span><span style="color: #0000ff;">base</span><span style="color: #000000;">.OnPause();
        }
        </span><span style="color: #0000ff;">protected</span> <span style="color: #0000ff;">override</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnResume()
        {
            mMapView.OnResume();
            textureId </span>= -<span style="color: #800080;">1</span><span style="color: #000000;">;
            </span><span style="color: #0000ff;">base</span><span style="color: #000000;">.OnResume();
        }

        </span><span style="color: #0000ff;">protected</span> <span style="color: #0000ff;">override</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnDestroy()
        {
            mMapView.OnDestroy();
            </span><span style="color: #0000ff;">base</span><span style="color: #000000;">.OnDestroy();
        }

        </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> OnMapDrawFrame(IGL10 gl, MapStatus drawingMapStatus)
        {
            </span><span style="color: #0000ff;">if</span> (mBaiduMap.Projection != <span style="color: #0000ff;">null</span><span style="color: #000000;">)
            {
                calPolylinePoint(drawingMapStatus);
                drawPolyline(gl, Color.Argb(</span><span style="color: #800080;">255</span>, <span style="color: #800080;">255</span>, <span style="color: #800080;">0</span>, <span style="color: #800080;">0</span>), vertexBuffer, <span style="color: #800080;">10</span>, <span style="color: #800080;">3</span><span style="color: #000000;">,
                        drawingMapStatus);
                drawTexture(gl, bitmap, drawingMapStatus);
            }
        }
        </span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> calPolylinePoint(MapStatus mspStatus)
        {
            PointF[] polyPoints </span>= <span style="color: #0000ff;">new</span><span style="color: #000000;"> PointF[latLngPolygon.Count];
            vertexs </span>= <span style="color: #0000ff;">new</span> <span style="color: #0000ff;">float</span>[<span style="color: #800080;">3</span> *<span style="color: #000000;"> latLngPolygon.Count];
            </span><span style="color: #0000ff;">int</span> i = <span style="color: #800080;">0</span><span style="color: #000000;">;
            </span><span style="color: #0000ff;">foreach</span> (LatLng xy <span style="color: #0000ff;">in</span><span style="color: #000000;"> latLngPolygon)
            {
                polyPoints[i] </span>=<span style="color: #000000;"> mBaiduMap.Projection.ToOpenGLLocation(xy, mspStatus);
                vertexs[i </span>* <span style="color: #800080;">3</span>] =<span style="color: #000000;"> polyPoints[i].X;
                vertexs[i </span>* <span style="color: #800080;">3</span> + <span style="color: #800080;">1</span>] =<span style="color: #000000;"> polyPoints[i].Y;
                vertexs[i </span>* <span style="color: #800080;">3</span> + <span style="color: #800080;">2</span>] = <span style="color: #800080;">0.0f</span><span style="color: #000000;">;
                i</span>++<span style="color: #000000;">;
            }
            </span><span style="color: #0000ff;">for</span> (<span style="color: #0000ff;">int</span> j = <span style="color: #800080;">0</span>; j )
            {
                Log.Debug(LTAG, <span style="color: #800000;">"</span><span style="color: #800000;">vertexs[</span><span style="color: #800000;">"</span> + j + <span style="color: #800000;">"</span><span style="color: #800000;">]: </span><span style="color: #800000;">"</span> +<span style="color: #000000;"> vertexs[j]);
            }
            vertexBuffer </span>=<span style="color: #000000;"> makeFloatBuffer(vertexs);
        }

        </span><span style="color: #0000ff;">private</span> FloatBuffer makeFloatBuffer(<span style="color: #0000ff;">float</span><span style="color: #000000;">[] fs)
        {
            ByteBuffer bb </span>= ByteBuffer.AllocateDirect(fs.Length * <span style="color: #800080;">4</span><span style="color: #000000;">);
            bb.Order(ByteOrder.NativeOrder());
            FloatBuffer fb </span>=<span style="color: #000000;"> bb.AsFloatBuffer();
            fb.Put(fs);
            fb.Position(</span><span style="color: #800080;">0</span><span style="color: #000000;">);
            </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> fb;
        }

        </span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">void</span> drawPolyline(IGL10 gl, <span style="color: #0000ff;">int</span><span style="color: #000000;"> color, FloatBuffer lineVertexBuffer,
                </span><span style="color: #0000ff;">float</span> lineWidth, <span style="color: #0000ff;">int</span><span style="color: #000000;"> pointSize, MapStatus drawingMapStatus)
        {

            gl.GlEnable(GL10.GlBlend);
            gl.GlEnableClientState(GL10.GlVertexArray);

            gl.GlBlendFunc(GL10.GlSrcAlpha, GL10.GlOneMinusSrcAlpha);

            </span><span style="color: #0000ff;">float</span> colorA = Color.GetAlphaComponent(color) /<span style="color: #000000;"> 255f;
            </span><span style="color: #0000ff;">float</span> colorR = Color.GetRedComponent(color) /<span style="color: #000000;"> 255f;
            </span><span style="color: #0000ff;">float</span> colorG = Color.GetGreenComponent(color) /<span style="color: #000000;"> 255f;
            </span><span style="color: #0000ff;">float</span> colorB = Color.GetBlueComponent(color) /<span style="color: #000000;"> 255f;

            gl.GlVertexPointer(</span><span style="color: #800080;">3</span>, GL10.GlFloat, <span style="color: #800080;">0</span><span style="color: #000000;">, lineVertexBuffer);
            gl.GlColor4f(colorR, colorG, colorB, colorA);
            gl.GlLineWidth(lineWidth);
            gl.GlDrawArrays(GL10.GlLineStrip, </span><span style="color: #800080;">0</span><span style="color: #000000;">, pointSize);

            gl.GlDisable(GL10.GlBlend);
            gl.GlDisableClientState(GL10.GlVertexArray);
        }

        </span><span style="color: #808080;">///</span> <span style="color: #808080;"><summary></summary></span>
        <span style="color: #808080;">///</span><span style="color: #008000;"> 使用opengl坐标绘制
        </span><span style="color: #808080;">///</span> <span style="color: #808080;"></span>
        <span style="color: #808080;">///</span> <span style="color: #808080;"><param name="gl"></span>
        <span style="color: #808080;">///</span> <span style="color: #808080;"><param name="bitmap"></span>
        <span style="color: #808080;">///</span> <span style="color: #808080;"><param name="drawingMapStatus"></span>
        <span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> drawTexture(IGL10 gl, Bitmap bitmap, MapStatus drawingMapStatus)
        {
            PointF p1 </span>=<span style="color: #000000;"> mBaiduMap.Projection.ToOpenGLLocation(latlng2,
                    drawingMapStatus);
            PointF p2 </span>=<span style="color: #000000;"> mBaiduMap.Projection.ToOpenGLLocation(latlng3,
                    drawingMapStatus);
            ByteBuffer byteBuffer </span>= ByteBuffer.AllocateDirect(<span style="color: #800080;">4</span> * <span style="color: #800080;">3</span> * <span style="color: #800080;">4</span><span style="color: #000000;">);
            byteBuffer.Order(ByteOrder.NativeOrder());
            FloatBuffer vertices </span>=<span style="color: #000000;"> byteBuffer.AsFloatBuffer();
            vertices.Put(</span><span style="color: #0000ff;">new</span> <span style="color: #0000ff;">float</span>[] { p1.X, p1.Y, <span style="color: #800080;">0.0f</span>, p2.X, p1.Y, <span style="color: #800080;">0.0f</span><span style="color: #000000;">, p1.X,
                p2.Y, </span><span style="color: #800080;">0.0f</span>, p2.X, p2.Y, <span style="color: #800080;">0.0f</span><span style="color: #000000;"> });

            ByteBuffer indicesBuffer </span>= ByteBuffer.AllocateDirect(<span style="color: #800080;">6</span> * <span style="color: #800080;">2</span><span style="color: #000000;">);
            indicesBuffer.Order(ByteOrder.NativeOrder());
            ShortBuffer indices </span>=<span style="color: #000000;"> indicesBuffer.AsShortBuffer();
            indices.Put(</span><span style="color: #0000ff;">new</span> <span style="color: #0000ff;">short</span>[] { <span style="color: #800080;">0</span>, <span style="color: #800080;">1</span>, <span style="color: #800080;">2</span>, <span style="color: #800080;">1</span>, <span style="color: #800080;">2</span>, <span style="color: #800080;">3</span><span style="color: #000000;"> });

            ByteBuffer textureBuffer </span>= ByteBuffer.AllocateDirect(<span style="color: #800080;">4</span> * <span style="color: #800080;">2</span> * <span style="color: #800080;">4</span><span style="color: #000000;">);
            textureBuffer.Order(ByteOrder.NativeOrder());
            FloatBuffer texture </span>=<span style="color: #000000;"> textureBuffer.AsFloatBuffer();
            texture.Put(</span><span style="color: #0000ff;">new</span> <span style="color: #0000ff;">float</span>[] { <span style="color: #800080;">0</span><span style="color: #000000;">, 1f, 1f, 1f, 0f, 0f, 1f, 0f });

            indices.Position(</span><span style="color: #800080;">0</span><span style="color: #000000;">);
            vertices.Position(</span><span style="color: #800080;">0</span><span style="color: #000000;">);
            texture.Position(</span><span style="color: #800080;">0</span><span style="color: #000000;">);

            </span><span style="color: #008000;">//</span><span style="color: #008000;"> 生成纹理</span>
            <span style="color: #0000ff;">if</span> (textureId == -<span style="color: #800080;">1</span><span style="color: #000000;">)
            {
                </span><span style="color: #0000ff;">int</span>[] textureIds = <span style="color: #0000ff;">new</span> <span style="color: #0000ff;">int</span>[<span style="color: #800080;">1</span><span style="color: #000000;">];
                gl.GlGenTextures(</span><span style="color: #800080;">1</span>, textureIds, <span style="color: #800080;">0</span><span style="color: #000000;">);
                textureId </span>= textureIds[<span style="color: #800080;">0</span><span style="color: #000000;">];
                Log.Debug(LTAG, </span><span style="color: #800000;">"</span><span style="color: #800000;">textureId: </span><span style="color: #800000;">"</span> +<span style="color: #000000;"> textureId);
                gl.GlBindTexture(GL10.GlTexture2d, textureId);
                GLUtils.TexImage2D(GL10.GlTexture2d, </span><span style="color: #800080;">0</span>, bitmap, <span style="color: #800080;">0</span><span style="color: #000000;">);
                gl.GlTexParameterf(GL10.GlTexture2d, GL10.GlTextureMinFilter, GL10.GlNearest);
                gl.GlTexParameterf(GL10.GlTexture2d, GL10.GlTextureMagFilter, GL10.GlNearest);
                gl.GlBindTexture(GL10.GlTexture2d, </span><span style="color: #800080;">0</span><span style="color: #000000;">);
            }

            gl.GlEnable(GL10.GlTexture2d);
            gl.GlEnableClientState(GL10.GlVertexArray);
            gl.GlEnableClientState(GL10.GlTextureCoordArray);
            gl.GlEnable(GL10.GlBlend);
            gl.GlBlendFunc(GL10.GlSrcAlpha, GL10.GlOneMinusSrcAlpha);
            gl.GlColor4f(</span><span style="color: #800080;">1.0f</span>, <span style="color: #800080;">1.0f</span>, <span style="color: #800080;">1.0f</span>, <span style="color: #800080;">1.0f</span><span style="color: #000000;">);

            </span><span style="color: #008000;">//</span><span style="color: #008000;"> 绑定纹理ID</span>
<span style="color: #000000;">            gl.GlBindTexture(GL10.GlTexture2d, textureId);
            gl.GlVertexPointer(</span><span style="color: #800080;">3</span>, GL10.GlFloat, <span style="color: #800080;">0</span><span style="color: #000000;">, vertices);
            gl.GlTexCoordPointer(</span><span style="color: #800080;">2</span>, GL10.GlFloat, <span style="color: #800080;">0</span><span style="color: #000000;">, texture);
            gl.GlDrawElements(GL10.GlTriangleStrip, </span><span style="color: #800080;">6</span><span style="color: #000000;">, GL10.GlUnsignedShort, indices);
            gl.GlDisable(GL10.GlTexture2d);
            gl.GlDisableClientState(GL10.GlVertexArray);
            gl.GlDisableClientState(GL10.GlTextureCoordArray);
            gl.GlDisable(GL10.GlBlend);
        }
    }
}</span></latlng></texturemapview></latlng>

3、修改MainActivity.cs文件

在MainActivity.cs文件的demos字段定义中，去掉【示例24】下面的注释。

运行观察效果。


声明
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn

热AI工具

Undresser.AI Undress

Undresser.AI Undress

人工智能驱动的应用程序，用于创建逼真的裸体照片

AI Clothes Remover

AI Clothes Remover

用于从照片中去除衣服的在线人工智能工具。

Undress AI Tool

Undress AI Tool

免费脱衣服图片

Clothoff.io

Clothoff.io

AI脱衣机

AI Hentai Generator

AI Hentai Generator

免费生成ai无尽的。

显示更多

热门文章

R.E.P.O.能量晶体解释及其做什么（黄色晶体）
3 周前By尊渡假赌尊渡假赌尊渡假赌
R.E.P.O.最佳图形设置
3 周前By尊渡假赌尊渡假赌尊渡假赌
刺客信条阴影：贝壳谜语解决方案
2 周前ByDDD
R.E.P.O.如果您听不到任何人，如何修复音频
3 周前By尊渡假赌尊渡假赌尊渡假赌
WWE 2K25：如何解锁Myrise中的所有内容
4 周前By尊渡假赌尊渡假赌尊渡假赌
显示更多

热工具

禅工作室 13.0.1

禅工作室 13.0.1

功能强大的PHP集成开发环境

Dreamweaver Mac版

Dreamweaver Mac版

视觉化网页开发工具

WebStorm Mac版

WebStorm Mac版

好用的JavaScript开发工具

SublimeText3 Mac版

SublimeText3 Mac版

神级代码编辑软件(SublimeText3)

mPDF

mPDF

mPDF是一个PHP库，可以从UTF-8编码的HTML生成PDF文件。原作者Ian Back编写mPDF以从他的网站上“即时”输出PDF文件，并处理不同的语言。与原始脚本如HTML2FPDF相比，它的速度较慢，并且在使用Unicode字体时生成的文件较大，但支持CSS样式等，并进行了大量增强。支持几乎所有语言，包括RTL（阿拉伯语和希伯来语）和CJK（中日韩）。支持嵌套的块级元素（如P、DIV），

显示更多

热门话题

gmail邮箱登陆入口在哪里
7478
15
CakePHP 教程
1377
52
steam的账户名称是什么格式
77
11
win11激活密钥永久
50
19
NYT连接提示和答案
19
33
显示更多