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前面已經(jīng)介紹雷達地圖的類聲明，現(xiàn)在就來仔細分析一下雷達地圖是怎么樣顯示出來的。雷達地圖顯示函數(shù) LLNetMap::draw代碼如下：

#001?void LLNetMap::draw()

#002?{

#003 ?? ?static LLFrameTimer map_timer;

#004?

判斷是否顯示雷達地圖。

#005? ?? if (!getVisible() || !gWorldPointer)

#006? ?? {

#007? ?????? return;

#008? ?? }

創(chuàng)建對象圖片。

#009? ?? if (mObjectImagep.isNull())

#010? ?? {

#011? ?????? createObjectImage();

#012? ?? }

#013? ??

#014? ?? mCurPanX = lerp(mCurPanX, mTargetPanX, LLCriticalDamp::getInterpolant(0.1f));

#015? ?? mCurPanY = lerp(mCurPanY, mTargetPanY, LLCriticalDamp::getInterpolant(0.1f));

#016 ?

#017? ?? // Prepare a scissor region

#018 ? ?? F32 rotation = 0;

#019?

#020? ?? {

#021? ?????? LLGLEnable scissor(GL_SCISSOR_TEST);

#022? ??????

#023? ?????? {

#024? ?????????? LLGLSNoTexture no_texture;

取得窗口顯示的大小。

#025? ?????????? LLLocalClipRect clip(getLocalRect());

#026?

設置 GL顯示的模式。

#027? ?????????? glMatrixMode(GL_MODELVIEW);

#028?

顯示背景方框。

#029? ?????????? // Draw background rectangle

#030? ?????????? gGL.color4fv( mBackgroundColor.mV );

#031? ?????????? gl_rect_2d(0, getRect().getHeight(), getRect().getWidth(), 0);

#032? ?????? }

#033?

計算中心位置。

#034? ?????? // region 0,0 is in the middle

#035? ?????? S32 center_sw_left = getRect().getWidth() / 2 + llfloor(mCurPanX);

#036? ?????? S32 center_sw_bottom = getRect().getHeight() / 2 + llfloor(mCurPanY);

#037?

#038? ?????? gGL.pushMatrix();

#039?

#040? ?????? gGL.translatef( (F32) center_sw_left, (F32) center_sw_bottom, 0.f);

#041?

判斷是否旋轉顯示地圖。

#042? ?????? if( LLNetMap::sRotateMap )

#043? ?????? {

#044? ?????????? // rotate subsequent draws to agent rotation

#045? ?????????? rotation = atan2( gCamera->getAtAxis().mV[VX], gCamera->getAtAxis().mV[VY] );

#046? ?????????? glRotatef( rotation * RAD_TO_DEG, 0.f, 0.f, 1.f);

#047? ?????? }

#048 ?

#049? ?????? // figure out where agent is

#050? ?????? S32 region_width = llround(gWorldPointer->getRegionWidthInMeters());

#051?

#052? ?????? for (LLWorld::region_list_t::iterator iter = gWorldp->mActiveRegionList.begin();

#053? ?????????? ?iter != gWorldp->mActiveRegionList.end(); ++iter)

#054? ?????? {

計算以當前攝像機為中心的地圖位置。

#055? ?????????? LLViewerRegion* regionp = *iter;

#056? ?????????? // Find x and y position relative to camera's center.

#057? ?????????? LLVector3 origin_agent = regionp->getOriginAgent();

#058? ?????????? LLVector3 rel_region_pos = origin_agent - gAgent.getCameraPositionAgent();

#059 ? ?????????? F32 relative_x = (rel_region_pos.mV[0] / region_width) * gMiniMapScale;

#060 ? ?????????? F32 relative_y = (rel_region_pos.mV[1] / region_width) * gMiniMapScale;

#061?

#062? ?????????? // background region rectangle

#063 ? ?????????? F32 bottom =??? relative_y;

#064 ? ?????????? F32 left =????? relative_x;

#065 ? ?????????? F32 top =?????? bottom + gMiniMapScale ;

#066 ? ?????????? F32 right =???? left + gMiniMapScale ;

#067?

#068? ?????????? if (regionp == gAgent.getRegion())

#069? ?????????? {

#070? ?????????????? gGL.color4f(1.f, 1.f, 1.f, 1.f);

#071? ?????????? }

#072? ?????????? else

#073? ?????????? {

#074? ?????????????? gGL.color4f(0.8f, 0.8f, 0.8f, 1.f);

#075? ?????????? }

#076?

#077? ?????????? if (!regionp->mAlive)

#078? ?????????? {

#079? ?????????????? gGL.color4f(1.f, 0.5f, 0.5f, 1.f);

#080? ?????????? }

#081?

#082?

顯示背景邊框。

#083? ?????????? // Draw using texture.

#084? ?????????? LLViewerImage::bindTexture(regionp->getLand().getSTexture());

#085? ?????????? gGL.begin(GL_QUADS);

#086? ?????????????? gGL.texCoord2f(0.f, 1.f);

#087? ?????????????? gGL.vertex2f(left, top);

#088? ?????????????? gGL.texCoord2f(0.f, 0.f);

#089? ?????????????? gGL.vertex2f(left, bottom);

#090? ?????????????? gGL.texCoord2f(1.f, 0.f);

#091? ?? ??????????? gGL.vertex2f(right, bottom);

#092? ?????????????? gGL.texCoord2f(1.f, 1.f);

#093? ?????????????? gGL.vertex2f(right, top);

#094? ?????????? gGL.end();

#095?

顯示水所在的區(qū)域。

#096? ?????????? // Draw water

#097? ?????????? glAlphaFunc(GL_GREATER, ABOVE_WATERLINE_ALPHA / 255.f );

#098? ?????????? {

#099? ?????????????? if (regionp->getLand().getWaterTexture())

#100? ?????????????? {

#101? ?????????????????? LLViewerImage::bindTexture(regionp->getLand().getWaterTexture());

#102? ?????????????????? gGL.begin(GL_QUADS);

#103? ?????????????????????? gGL.texCoord2f(0.f, 1.f);

#104? ?????????????????????? gGL.vertex2f(left, top);

#105? ?????????????????????? gGL.texCoord2f(0.f, 0.f);

#106? ?????????????????????? gGL.vertex2f(left, bottom);

#107? ?????????????????????? gGL.texCoord2f(1.f, 0.f);

#108? ?????????????????????? gGL.vertex2f(right, bottom);

#109? ?????????????????????? gGL.texCoord2f(1.f, 1.f);

#110? ?????????????????????? gGL.vertex2f(right, top);

#111? ?????????????????? gGL.end();

#112? ?????????????? }

#113? ?????????? }

#114? ?????????? glAlphaFunc(GL_GREATER,0.01f);

#115? ?????? }

#116? ??????

#117?

#118? ?????? LLVector3d old_center = mObjectImageCenterGlobal;

#119? ?????? LLVector3d new_center = gAgent.getCameraPositionGlobal();

#120?

#121? ?????? new_center.mdV[0] = (5.f/mObjectMapTPM)*floor(0.2f*mObjectMapTPM*new_center.mdV[0]);

#122? ?????? new_center.mdV[1] = (5.f/mObjectMapTPM)*floor(0.2f*mObjectMapTPM*new_center.mdV[1]);

#123? ?????? new_center.mdV[2] = 0.f;

#124?

#125? ?????? if (mUpdateNow || (map_timer.getElapsedTimeF32() > 0.5f))

#126? ?????? {

#127? ?????????? mUpdateNow = FALSE;

#128? ?????????? mObjectImageCenterGlobal = new_center;

#129?

#130? ?????????? // Center moved enough.

#131? ?????????? // Create the base texture.

#132? ?????????? U8 *default_texture = mObjectRawImagep->getData();

#133? ?????????? memset( default_texture, 0, mObjectImagep->getWidth() * mObjectImagep->getHeight() * mObjectImagep->getComponents() );

#134?

顯示建筑物，根據(jù)水平面的高度來顯示不同的顏色。

#135? ?????????? // Draw buildings

#136? ?????????? gObjectList.renderObjectsForMap(*this);

#137?

#138? ?????????? mObjectImagep->setSubImage(mObjectRawImagep, 0, 0, mObjectImagep->getWidth(), mObjectImagep->getHeight());

#139? ??????????

#140? ?????????? map_timer.reset();

#141? ?????? }

#142?

#143? ?????? LLVector3 map_center_agent = gAgent.getPosAgentFromGlobal(mObjectImageCenterGlobal);

#144? ?????? map_center_agent -= gAgent.getCameraPositionAgent();

#145? ?????? map_center_agent.mV[VX] *= gMiniMapScale/region_width;

#146? ?????? map_center_agent.mV[VY] *= gMiniMapScale/region_width;

#147?

#148? ?????? LLViewerImage::bindTexture(mObjectImagep);

#149 ? ?????? F32 image_half_width = 0.5f*mObjectMapPixels;

#150 ? ?????? F32 image_half_height = 0.5f*mObjectMapPixels;

#151?

#152? ?????? gGL.begin(GL_QUADS);

#153? ?????????? gGL.texCoord2f(0.f, 1.f);

#154? ?????????? gGL.vertex2f(map_center_agent.mV[VX] - image_half_width, image_half_height + map_center_agent.mV[VY]);

#155? ?????????? gGL.texCoord2f(0.f, 0.f);

#156? ?????????? gGL.vertex2f(map_center_agent.mV[VX] - image_half_width, map_center_agent.mV[VY] - image_half_height);

#157? ?????????? gGL.texCoord2f(1.f, 0.f);

#158? ?????????? gGL.vertex2f(image_half_width + map_center_agent.mV[VX], map_center_agent.mV[VY] - image_half_height);

#159? ?????????? gGL.texCoord2f(1.f, 1.f);

#160? ?????????? gGL.vertex2f(image_half_width + map_center_agent.mV[VX], image_half_height + map_center_agent.mV[VY]);

#161? ?????? gGL.end();

#162?

#163? ?????? gGL.popMatrix();

#164?

#165? ?????? LLVector3d pos_global;

#166? ?????? LLVector3 pos_map;

#167?

下面開始顯示整個地圖上所有玩家。

#168? ?????? // Draw avatars

#169? ?????? for (LLWorld::region_list_t::iterator iter = gWorldp->mActiveRegionList.begin();

#170? ?????????? ?iter != gWorldp->mActiveRegionList.end(); ++iter)

#171? ?????? {

獲取所在區(qū)域。

#172? ?????????? LLViewerRegion* regionp = *iter;

#173? ?????????? const LLVector3d& origin_global = regionp->getOriginGlobal();

#174?

獲取當前玩家的人數(shù)。

#175? ?????????? S32 count = regionp->mMapAvatars.count();

#176? ?????????? S32 i;

#177? ?????????? LLVector3 pos_local;

#178? ?????????? U32 compact_local;

#179? ?????????? U8 bits;

#180? ?????????? // TODO: it'd be very cool to draw these in sorted order from lowest Z to highest.

#181? ?????????? // just be careful to sort the avatar IDs along with the positions. –MG

開始在地圖上顯示所有玩家。

#182? ?????????? for (i = 0; i < count; i++)

#183? ?????????? {

#184? ?????????????? compact_local = regionp->mMapAvatars.get(i);

#185?

#186? ?????????????? bits = compact_local & 0xFF;

#187? ?????????????? pos_local.mV[VZ] = F32(bits) * 4.f;

#188? ?????????????? compact_local >>= 8;

#189?

#190? ?????????????? bits = compact_local & 0xFF;

#191? ?????????????? pos_local.mV[VY] = (F32)bits;

#192? ?????????????? compact_local >>= 8;

#193?

#194? ?????????????? bits = compact_local & 0xFF;

#195? ?????????????? pos_local.mV[VX] = (F32)bits;

#196?

#197? ?????????????? pos_global.setVec( pos_local );

#198? ?????????????? pos_global += origin_global;

#199?

從全局坐標轉換為地圖坐標。

#200? ?????????????? pos_map = globalPosToView(pos_global);

#201?

#202? ?????????????? BOOL show_as_friend = FALSE;

#203? ?????????????? if( i < regionp->mMapAvatarIDs.count())

#204? ?????????????? {

#205? ?????????????????? show_as_friend = is_agent_friend(regionp->mMapAvatarIDs.get(i));

#206? ?????????????? }

在地圖坐標上顯示玩家。

#207? ?????????????? LLWorldMapView::drawAvatar(

#208? ?????????????????? pos_map.mV[VX], pos_map.mV[VY],

#209? ?????????????????? show_as_friend ? gFriendMapColor : gAvatarMapColor,

#210? ?????????????????? pos_map.mV[VZ]);

#211? ?????????? }

#212? ?????? }

#213?

#214? ?????? // Draw dot for autopilot target

#215? ?????? if (gAgent.getAutoPilot())

#216? ?????? {

#217? ?????????? drawTracking( gAgent.getAutoPilotTargetGlobal(), gTrackColor );

#218? ?????? }

#219? ?????? else

#220? ?????? {

#221? ?????????? LLTracker::ETrackingStatus tracking_status = LLTracker::getTrackingStatus();

#222? ?????????? if (?LLTracker::TRACKING_AVATAR == tracking_status )

#223? ?????????? {

#224? ?????????????? drawTracking( LLAvatarTracker::instance().getGlobalPos(), gTrackColor );

#225? ?????????? }

#226? ?????????? else if ( LLTracker::TRACKING_LANDMARK == tracking_status

#227? ?????????????????? || LLTracker::TRACKING_LOCATION == tracking_status )

#228? ?????????? {

#229? ?????????????? drawTracking( LLTracker::getTrackedPositionGlobal(), gTrackColor );

#230? ?????????? }

#231? ?????? }

#232?

#233? ?????? // Draw dot for self avatar position

#234? ?????? //drawTracking( gAgent.getPosGlobalFromAgent(gAgent.getFrameAgent().getCenter()), gSelfMapColor );

#235? ?????? pos_global = gAgent.getPositionGlobal();

#236? ?????? pos_map = globalPosToView(pos_global);

#237? ?????? gl_draw_image(llround(pos_map.mV[VX]) - 4,

#238? ?????????????????? llround(pos_map.mV[VY]) - 4,

#239? ?????????????????? LLWorldMapView::sAvatarYouSmallImage,

#240? ?????????????????? LLColor4::white);

#241?

計算當前攝像機觀看的視角。

#242? ?????? // Draw frustum

#243 ? ?????? F32 meters_to_pixels = gMiniMapScale/ gWorldPointer->getRegionWidthInMeters();

#244?

#245 ? ?? ??? F32 horiz_fov = gCamera->getView() * gCamera->getAspect();

#246 ? ?????? F32 far_clip_meters = gCamera->getFar();

#247 ? ?????? F32 far_clip_pixels = far_clip_meters * meters_to_pixels;

#248?

#249 ? ?????? F32 half_width_meters = far_clip_meters * tan( horiz_fov / 2 );

#250 ? ?????? F32 half_width_pixels = half_width_meters * meters_to_pixels;

#251? ??????

#252 ? ?????? F32 ctr_x = (F32)center_sw_left;

#253 ? ?????? F32 ctr_y = (F32)center_sw_bottom;

#254?

#255?

#256? ?????? LLGLSNoTexture no_texture;

#257?

旋轉地圖的顯示。

#258? ?????? if( LLNetMap::sRotateMap )

#259? ?????? {

#260? ?????????? gGL.color4fv(gFrustumMapColor.mV);

#261?

#262? ?????????? gGL.begin( GL_TRIANGLES?);

#263? ?????????????? gGL.vertex2f( ctr_x, ctr_y );

#264? ?????????????? gGL.vertex2f( ctr_x - half_width_pixels, ctr_y + far_clip_pixels );

#265? ?????????????? gGL.vertex2f( ctr_x + half_width_pixels, ctr_y + far_clip_pixels );

#266? ?????????? gGL.end();

#267? ?????? }

#268? ?????? else

#269? ?????? {

#270? ?????????? gGL.color4fv(gRotatingFrustumMapColor.mV);

#271? ??????????

#272? ?????????? // If we don't rotate the map, we have to rotate the frustum.

#273? ?????????? gGL.pushMatrix();

#274? ?????????? ??? gGL.translatef( ctr_x, ctr_y, 0 );

#275? ?????????????? glRotatef( atan2( gCamera->getAtAxis().mV[VX], gCamera->getAtAxis().mV[VY] ) * RAD_TO_DEG, 0.f, 0.f, -1.f);

#276? ?????????????? gGL.begin( GL_TRIANGLES?);

#277? ?????????????????? gGL.vertex2f( 0, 0 );

#278? ?????????????????? gGL.vertex2f( -half_width_pixels, far_clip_pixels );

#279? ?????????????????? gGL.vertex2f(?half_width_pixels, far_clip_pixels );

#280? ?????????????? gGL.end();

#281? ?????????? gGL.popMatrix();

#282? ?????? }

#283? ?? }

#284? ??

下面顯示 8個方向的文字提示。

#285? ?? // Rotation of 0 means that North is up

#286? ?? setDirectionPos( mTextBoxEast, ?rotation );

#287? ?? setDirectionPos( mTextBoxNorth, rotation + F_PI_BY_TWO );

#288? ?? setDirectionPos( mTextBoxWest,?rotation + F_PI );

#289? ?? setDirectionPos( mTextBoxSouth, rotation + F_PI + F_PI_BY_TWO );

#290?

#291? ?? setDirectionPos( mTextBoxNorthEast, rotation +????????????????????? F_PI_BY_TWO / 2);

#292? ?? setDirectionPos( mTextBoxNorthWest, rotation + F_PI_BY_TWO +??????? F_PI_BY_TWO / 2);

#293? ?? setDirectionPos( mTextBoxSouthWest, rotation + F_PI +?????????????? F_PI_BY_TWO / 2);

#294? ?? setDirectionPos( mTextBoxSouthEast, rotation + F_PI + F_PI_BY_TWO + F_PI_BY_TWO / 2);

#295?

#296? ?? LLUICtrl::draw();

#297?}

從上面的函數(shù)可以看到，先顯示底層的邊框，然后在上面顯示水區(qū)域，接著顯示建筑物層，最后在上面顯示玩家所在的地方。當然還顯示當前玩家所能看到的視角平面，顯示地圖八個方向的文字顯示。

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第二人生的源碼分析(100)雷達地圖詳細顯示

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