You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
2.5 KiB
64 lines
2.5 KiB
/****************************************************************************
|
|
Copyright (c) 2021-2023 Xiamen Yaji Software Co., Ltd.
|
|
|
|
http://www.cocos.com
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files (the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights to
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is furnished to do so,
|
|
subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in
|
|
all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
THE SOFTWARE.
|
|
****************************************************************************/
|
|
|
|
#include "primitive/Circle.h"
|
|
#include "gfx-base/GFXDef-common.h"
|
|
|
|
namespace cc {
|
|
IGeometry circle(ccstd::optional<ICircleOptions> &options) {
|
|
if (!options.has_value()) options = ICircleOptions();
|
|
const uint32_t segments = options->segments;
|
|
ccstd::vector<float> positions(3 * (segments + 1));
|
|
positions[0] = 0;
|
|
positions[1] = 0;
|
|
positions[2] = 0;
|
|
ccstd::vector<uint32_t> indices(1 + segments * 2);
|
|
indices[0] = 0;
|
|
const float step = math::PI * 2 / static_cast<float>(segments);
|
|
for (uint32_t iSegment = 0; iSegment < segments; ++iSegment) {
|
|
const float angle = step * static_cast<float>(iSegment);
|
|
const float x = cos(angle);
|
|
const float y = sin(angle);
|
|
const uint32_t p = (iSegment + 1) * 3;
|
|
positions[p + 0] = x;
|
|
positions[p + 1] = y;
|
|
positions[p + 2] = 0;
|
|
const uint32_t i = iSegment * 2;
|
|
indices[1 + (i)] = iSegment + 1;
|
|
indices[1 + (i + 1)] = iSegment + 2;
|
|
}
|
|
if (segments > 0) {
|
|
indices[indices.size() - 1] = 1;
|
|
}
|
|
|
|
IGeometry info;
|
|
info.positions = positions;
|
|
info.boundingRadius = 1;
|
|
info.minPos = Vec3(1, 1, 0);
|
|
info.maxPos = Vec3(-1, -1, 0);
|
|
info.indices = indices;
|
|
info.primitiveMode = gfx::PrimitiveMode::TRIANGLE_FAN;
|
|
return info;
|
|
}
|
|
} // namespace cc
|
|
|