| // Copyright 2020 The Fuchsia 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 SRC_GRAPHICS_LIB_COMPUTE_SPINEL_EXT_GEOMETRY_ARC_H_ |
| #define SRC_GRAPHICS_LIB_COMPUTE_SPINEL_EXT_GEOMETRY_ARC_H_ |
| |
| // |
| // |
| // |
| |
| #include "spinel/spinel.h" |
| |
| // |
| // |
| // |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| // |
| // |
| // |
| |
| typedef struct spn_arc_params |
| { |
| float x0; // start point |
| float y0; // |
| float x1; // end point |
| float y1; // |
| float rx; // arc radii |
| float ry; // |
| float cx; // center of arc |
| float cy; // |
| float phi; // relative rotation of arc |
| float theta; // start angle of arc |
| float theta_delta; // sweep of arc |
| } spn_arc_params_t; |
| |
| // |
| // Create an arc from a valid center parameterization by emitting zero |
| // or more rational quads of fixed sweep and one final arc of the |
| // remaining sweep. |
| // |
| // A degenerate arc results in a line segment joining the start and end |
| // points. |
| // |
| // Arc parameters must satisfy: |
| // |
| // * radii must be positive |
| // * phi and theta are within a valid implementation defined range |
| // * (2 * M_PI) < theta_delta < (2 * M_PI) |
| // |
| |
| spn_result_t |
| spn_path_builder_arc(spn_path_builder_t path_builder, spn_arc_params_t const * arc_params); |
| |
| // |
| // |
| // |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| // |
| // |
| // |
| |
| #endif // SRC_GRAPHICS_LIB_COMPUTE_SPINEL_EXT_GEOMETRY_ARC_H_ |
