X-lanni
37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
/*
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* Copyright 2014 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "tango-gl/circle.h"
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namespace tango_gl {
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Circle::Circle(float radius, int resolution) : Mesh(GL_TRIANGLE_FAN){
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SetShader();
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std::vector<GLfloat> vertices;
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vertices.reserve(3 * (resolution + 2));
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vertices.push_back(0);
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vertices.push_back(0);
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vertices.push_back(0);
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float delta_theta = M_PI * 2.0f / static_cast<float>(resolution);
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for (int i = resolution; i >= 0; i--) {
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float theta = delta_theta * static_cast<float>(i);
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vertices.push_back(cos(theta) * radius);
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vertices.push_back(sin(theta) * radius);
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vertices.push_back(0);
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}
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SetVertices(vertices);
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}
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} // namespace tango_gl
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