F32 angle_between(const LLVector2& a, const LLVector2& b) { LLVector2 an = a; LLVector2 bn = b; an.normVec(); bn.normVec(); F32 cosine = an * bn; F32 angle = (cosine >= 1.0f) ? 0.0f : (cosine <= -1.0f) ? F_PI : acos(cosine); return angle; }
BOOL are_parallel(const LLVector2 &a, const LLVector2 &b, float epsilon) { LLVector2 an = a; LLVector2 bn = b; an.normVec(); bn.normVec(); F32 dot = an * bn; if ( (1.0f - fabs(dot)) < epsilon) { return TRUE; } return FALSE; }
void LLHUDNameTag::updateAll() { // iterate over all text objects, calculate their restoration forces, // and add them to the visible set if they are on screen and close enough sVisibleTextObjects.clear(); TextObjectIterator text_it; for (text_it = sTextObjects.begin(); text_it != sTextObjects.end(); ++text_it) { LLHUDNameTag* textp = (*text_it); textp->mTargetPositionOffset.clearVec(); textp->updateSize(); textp->updateVisibility(); } // sort back to front for rendering purposes std::sort(sVisibleTextObjects.begin(), sVisibleTextObjects.end(), llhudnametag_further_away()); // iterate from front to back, and set LOD based on current screen coverage F32 screen_area = (F32)(gViewerWindow->getWindowWidthScaled() * gViewerWindow->getWindowHeightScaled()); F32 current_screen_area = 0.f; std::vector<LLPointer<LLHUDNameTag> >::reverse_iterator r_it; for (r_it = sVisibleTextObjects.rbegin(); r_it != sVisibleTextObjects.rend(); ++r_it) { LLHUDNameTag* textp = (*r_it); if (current_screen_area / screen_area > LOD_2_SCREEN_COVERAGE) { textp->setLOD(3); } else if (current_screen_area / screen_area > LOD_1_SCREEN_COVERAGE) { textp->setLOD(2); } else if (current_screen_area / screen_area > LOD_0_SCREEN_COVERAGE) { textp->setLOD(1); } else { textp->setLOD(0); } textp->updateSize(); // find on-screen position and initialize collision rectangle textp->mTargetPositionOffset = textp->updateScreenPos(LLVector2::zero); current_screen_area += (F32)(textp->mSoftScreenRect.getWidth() * textp->mSoftScreenRect.getHeight()); } LLTrace::CountStatHandle<>* camera_vel_stat = LLViewerCamera::getVelocityStat(); F32 camera_vel = LLTrace::get_frame_recording().getLastRecording().getPerSec(*camera_vel_stat); if (camera_vel > MAX_STABLE_CAMERA_VELOCITY) { return; } VisibleTextObjectIterator src_it; for (S32 i = 0; i < NUM_OVERLAP_ITERATIONS; i++) { for (src_it = sVisibleTextObjects.begin(); src_it != sVisibleTextObjects.end(); ++src_it) { LLHUDNameTag* src_textp = (*src_it); VisibleTextObjectIterator dst_it = src_it; ++dst_it; for (; dst_it != sVisibleTextObjects.end(); ++dst_it) { LLHUDNameTag* dst_textp = (*dst_it); if (src_textp->mSoftScreenRect.overlaps(dst_textp->mSoftScreenRect)) { LLRectf intersect_rect = src_textp->mSoftScreenRect; intersect_rect.intersectWith(dst_textp->mSoftScreenRect); intersect_rect.stretch(-BUFFER_SIZE * 0.5f); F32 src_center_x = src_textp->mSoftScreenRect.getCenterX(); F32 src_center_y = src_textp->mSoftScreenRect.getCenterY(); F32 dst_center_x = dst_textp->mSoftScreenRect.getCenterX(); F32 dst_center_y = dst_textp->mSoftScreenRect.getCenterY(); F32 intersect_center_x = intersect_rect.getCenterX(); F32 intersect_center_y = intersect_rect.getCenterY(); LLVector2 force = lerp(LLVector2(dst_center_x - intersect_center_x, dst_center_y - intersect_center_y), LLVector2(intersect_center_x - src_center_x, intersect_center_y - src_center_y), 0.5f); force.setVec(dst_center_x - src_center_x, dst_center_y - src_center_y); force.normVec(); LLVector2 src_force = -1.f * force; LLVector2 dst_force = force; LLVector2 force_strength; F32 src_mult = dst_textp->mMass / (dst_textp->mMass + src_textp->mMass); F32 dst_mult = 1.f - src_mult; F32 src_aspect_ratio = src_textp->mSoftScreenRect.getWidth() / src_textp->mSoftScreenRect.getHeight(); F32 dst_aspect_ratio = dst_textp->mSoftScreenRect.getWidth() / dst_textp->mSoftScreenRect.getHeight(); src_force.mV[VY] *= src_aspect_ratio; src_force.normVec(); dst_force.mV[VY] *= dst_aspect_ratio; dst_force.normVec(); src_force.mV[VX] *= llmin(intersect_rect.getWidth() * src_mult, intersect_rect.getHeight() * SPRING_STRENGTH); src_force.mV[VY] *= llmin(intersect_rect.getHeight() * src_mult, intersect_rect.getWidth() * SPRING_STRENGTH); dst_force.mV[VX] *= llmin(intersect_rect.getWidth() * dst_mult, intersect_rect.getHeight() * SPRING_STRENGTH); dst_force.mV[VY] *= llmin(intersect_rect.getHeight() * dst_mult, intersect_rect.getWidth() * SPRING_STRENGTH); src_textp->mTargetPositionOffset += src_force; dst_textp->mTargetPositionOffset += dst_force; src_textp->mTargetPositionOffset = src_textp->updateScreenPos(src_textp->mTargetPositionOffset); dst_textp->mTargetPositionOffset = dst_textp->updateScreenPos(dst_textp->mTargetPositionOffset); } } } } VisibleTextObjectIterator this_object_it; for (this_object_it = sVisibleTextObjects.begin(); this_object_it != sVisibleTextObjects.end(); ++this_object_it) { (*this_object_it)->mPositionOffset = lerp((*this_object_it)->mPositionOffset, (*this_object_it)->mTargetPositionOffset, LLSmoothInterpolation::getInterpolant(POSITION_DAMPING_TC)); } }