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Refactor to use Color class and Triangle structure for better clarity in drawing functions

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This commit is contained in:
Saikari
2026-02-20 03:01:34 +03:00
parent b8323d3bc0
commit 66debb46fa
1 changed files with 24 additions and 15 deletions
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39
examples/example_barycentric.cpp
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@@ -3,11 +3,11 @@
#include <iostream>
#include <vector>
#include <cmath>
#include "omath/linear_algebra/vector3.hpp"
#include "omath/linear_algebra/triangle.hpp"
#include <omath/omath.hpp>
using omath::Vector3;
using omath::Triangle;
using omath::Color;
static const char* vertexShaderSource = R"(
#version 330 core
@@ -59,7 +59,7 @@ GLuint compileShader(GLenum type, const char* src) {
return shader;
}
void drawChar(char c, float x, float y, float scale, const Vector3<float>& color, std::vector<float>& lines) {
void drawChar(char c, float x, float y, float scale, const Color& color, std::vector<float>& lines) {
float w = 0.5f * scale;
float h = 1.0f * scale;
@@ -90,7 +90,7 @@ void drawChar(char c, float x, float y, float scale, const Vector3<float>& color
}
}
void drawText(const std::string& text, float x, float y, float scale, const Vector3<float>& color, std::vector<float>& lines) {
void drawText(const std::string& text, float x, float y, float scale, const Color& color, std::vector<float>& lines) {
float cursor = x;
for (char c : text) {
drawChar(c, cursor, y, scale, color, lines);
@@ -151,7 +151,10 @@ GLuint createShaderProgram() {
return shaderProgram;
}
void generatePointCloud(std::vector<float>& pointCloud, const Vector3<float>& A, const Vector3<float>& B, const Vector3<float>& C) {
void generatePointCloud(std::vector<float>& pointCloud, const Triangle<Vector3<float>>& triangle) {
const auto& A = triangle.m_vertex1;
const auto& B = triangle.m_vertex2;
const auto& C = triangle.m_vertex3;
// Iterating over barycentric coordinates (u, v, w) from 0.0 to 1.0
for (float u = 0.0f; u <= 1.0f; u += 0.015f) {
for (float v = 0.0f; v <= 1.0f - u; v += 0.015f) {
@@ -197,7 +200,11 @@ void setupBuffers(GLuint& VAO_cloud, GLuint& VBO_cloud, const std::vector<float>
glEnableVertexAttribArray(3);
}
void updateDynamicData(std::vector<float>& dynData, float u, float v, float w, const Vector3<float>& P, const Vector3<float>& A, const Vector3<float>& B, const Vector3<float>& C) {
void updateDynamicData(std::vector<float>& dynData, float u, float v, float w, const Vector3<float>& P, const Triangle<Vector3<float>>& triangle) {
const auto& A = triangle.m_vertex1;
const auto& B = triangle.m_vertex2;
const auto& C = triangle.m_vertex3;
float sizeA = 10.0f + u * 30.0f;
float sizeB = 10.0f + v * 30.0f;
float sizeC = 10.0f + w * 30.0f;
@@ -233,9 +240,9 @@ void updateDynamicData(std::vector<float>& dynData, float u, float v, float w, c
float distB = 0.13f;
float distC = 0.13f;
drawText(bufA, A.x - 0.05f, A.y + distA, 0.1f, Vector3<float>(1,0,0), dynData);
drawText(bufB, B.x - 0.15f - distB, B.y - 0.05f - distB, 0.1f, Vector3<float>(0,1,0), dynData);
drawText(bufC, C.x + 0.05f + distC, C.y - 0.05f - distC, 0.1f, Vector3<float>(0,0,1), dynData);
drawText(bufA, A.x - 0.05f, A.y + distA, 0.1f, Color(1,0,0,1), dynData);
drawText(bufB, B.x - 0.15f - distB, B.y - 0.05f - distB, 0.1f, Color(0,1,0,1), dynData);
drawText(bufC, C.x + 0.05f + distC, C.y - 0.05f - distC, 0.1f, Color(0,0,1,1), dynData);
}
int main() {
@@ -246,12 +253,14 @@ int main() {
// Triangle vertices as shown in the picture (Red, Green, Blue)
// Scaled down slightly to leave room for text
Vector3<float> A(0.0f, 0.6f, 0.0f); // Red dot (top)
Vector3<float> B(-0.6f, -0.6f, 0.0f); // Green dot (bottom left)
Vector3<float> C(0.6f, -0.6f, 0.0f); // Blue dot (bottom right)
Triangle<Vector3<float>> triangle(
Vector3<float>(0.0f, 0.6f, 0.0f), // Red dot (top)
Vector3<float>(-0.6f, -0.6f, 0.0f), // Green dot (bottom left)
Vector3<float>(0.6f, -0.6f, 0.0f) // Blue dot (bottom right)
);
std::vector<float> pointCloud;
generatePointCloud(pointCloud, A, B, C);
generatePointCloud(pointCloud, triangle);
GLuint VAO_cloud, VBO_cloud, VAO_dyn, VBO_dyn;
setupBuffers(VAO_cloud, VBO_cloud, pointCloud, VAO_dyn, VBO_dyn);
@@ -293,10 +302,10 @@ int main() {
v -= diff / 2.0f;
}
Vector3<float> P = A * u + B * v + C * w;
Vector3<float> P = triangle.m_vertex1 * u + triangle.m_vertex2 * v + triangle.m_vertex3 * w;
std::vector<float> dynData;
updateDynamicData(dynData, u, v, w, P, A, B, C);
updateDynamicData(dynData, u, v, w, P, triangle);
glBindVertexArray(VAO_dyn);
glBindBuffer(GL_ARRAY_BUFFER, VBO_dyn);