2021-11-30 17:49:41 +08:00
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import math
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from SelfBuiltModul.func import degrees_to_radians
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2021-12-03 16:42:37 +08:00
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def calculate_los_angle(qgc_previous, qgc_current, qgc_next, los_distance=1.5):
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2021-11-30 17:49:41 +08:00
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# 直线方向 degrees
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previous_2_next_angle = qgc_previous.azimuthTo(qgc_next)
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# 计算垂点
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angle_between = degrees_to_radians(previous_2_next_angle - qgc_previous.azimuthTo(qgc_current))
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# 距离
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previous_2_current_distance = qgc_previous.distanceTo(qgc_current)
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current_2_line_distance = abs(previous_2_current_distance * math.sin(angle_between))
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# GPS
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previous_2_perpendicular_distance = previous_2_current_distance * math.cos(angle_between)
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qgc_perpendicular = qgc_previous.atDistanceAndAzimuth(previous_2_perpendicular_distance, previous_2_next_angle)
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# 计算交点 修正
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if los_distance < current_2_line_distance:
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los_distance = current_2_line_distance
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distance_added = math.sqrt(los_distance * los_distance - current_2_line_distance * current_2_line_distance)
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# 交点
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qgc_cross = qgc_perpendicular.atDistanceAndAzimuth(distance_added, previous_2_next_angle)
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# 计算los
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previous_2_next_latitude = qgc_next.latitude() - qgc_previous.latitude()
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previous_2_cross_latitude = qgc_cross.latitude() - qgc_previous.latitude()
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next_2_cross_latitude = qgc_cross.latitude() - qgc_next.latitude()
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# 后向
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if previous_2_next_latitude * previous_2_cross_latitude < 0:
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return degrees_to_radians(qgc_current.azimuthTo(qgc_previous))
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# 前向
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if previous_2_next_latitude * next_2_cross_latitude > 0:
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return degrees_to_radians(qgc_current.azimuthTo(qgc_next))
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# 中间
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return degrees_to_radians(qgc_current.azimuthTo(qgc_cross))
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