| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef ASH_LASER_LASER_SEGMENT_UTILS_H_ |
| #define ASH_LASER_LASER_SEGMENT_UTILS_H_ |
| |
| #include <vector> |
| |
| #include "ash/ash_export.h" |
| |
| namespace gfx { |
| class PointF; |
| class Vector2dF; |
| } |
| |
| namespace ash { |
| |
| // Compute the angle in radians of |point|, with |origin| as the origin and |
| // |direction| as the x-axis. In other words, computes the angle in radians |
| // between |direction| and |point| - |origin|. |
| float ASH_EXPORT AngleOfPointInNewCoordinates(const gfx::PointF& origin, |
| const gfx::Vector2dF& direction, |
| const gfx::PointF& point); |
| |
| // Compute the variables for the equation of the lines normal to the line |
| // segment formed by |start_point| and |end_point|, and which run through the |
| // endpoints of that line segment. The outputs will be returned as NaN if the |
| // line segment is parallel to the x-axis (undefined normal lines). |
| void ASH_EXPORT ComputeNormalLineVariables(const gfx::PointF& start_point, |
| const gfx::PointF& end_point, |
| float* normal_slope, |
| float* start_y_intercept, |
| float* end_y_intercept); |
| |
| // Compute the two the projections of |point| along the line defined by |
| // |line_slope| and |line_y_intercept|. The distance of each projection is |
| // |projection_distance| from |point|. |
| void ASH_EXPORT ComputeProjectedPoints(const gfx::PointF& point, |
| float line_slope, |
| float line_y_intercept, |
| float projection_distance, |
| gfx::PointF* first_projection, |
| gfx::PointF* second_projection); |
| |
| // Checks if the angle of |first_point| is smaller than the angle of |
| // |second_point|. These angles are computed relative to the coordinate system |
| // defined by the midpoint of |start_point| and |end_point|, with the x-axis |
| // as |end_point| - |start_point|. |
| bool ASH_EXPORT IsFirstPointSmallerAngle(const gfx::PointF& start_point, |
| const gfx::PointF& end_point, |
| const gfx::PointF& first_point, |
| const gfx::PointF& second_point); |
| |
| } // namespace ash |
| |
| #endif // ASH_LASER_LASER_SEGMENT_UTILS_H_ |