59 lines
1.6 KiB
C++
59 lines
1.6 KiB
C++
#include "polygons.h"
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#include "matrix.h"
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#include "polygon_generator.h"
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#include <cmath>
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#include <iostream>
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polygon* polygons = nullptr;
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uint n_polygons = 3;
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void polygons_init_state() {
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polygons = new polygon[n_polygons];
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polygons[0] = poly_generate::triangle(150, 150, 30)
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.set_center({400, 300})
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.set_angle(90);
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polygons[1] = poly_generate::square(200).set_center({200, 600});
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polygons[2] = poly_generate::rectangle(200, 100).set_center({600, 600});
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}
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static double to_rad(double angle_in_deg) {
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static double PI_180 = M_PI / 180;
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return angle_in_deg * PI_180;
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}
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void polygons_update_state() {
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static double angle = 0;
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for (polygon* p = polygons; p != polygons + n_polygons; ++p) {
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p->rotate(1);
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p->translate({2 * std::cos(angle), 0});
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}
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angle -= .03;
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}
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void polygon::draw(cairo_t* cr) const {
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const vec2d& center = this->center;
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cairo_set_source_rgb(cr, 1, 1, 1);
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double cos_theta = std::cos(to_rad(this->angle));
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double sin_theta = std::sin(to_rad(this->angle));
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matrix rotation = matrix{{cos_theta, sin_theta}, {-sin_theta, cos_theta}};
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vec2d final_point;
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for (auto& point : this->points) {
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final_point = rotation * point;
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cairo_line_to(cr, center.x + final_point.x, center.y + final_point.y);
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}
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final_point = rotation * this->points[0];
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cairo_line_to(cr, center.x + final_point.x, center.y + final_point.y);
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cairo_stroke(cr);
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}
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void polygons_draw(cairo_t* cr) {
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for (const polygon* p = polygons; p != polygons + n_polygons; ++p)
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p->draw(cr);
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}
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