56 lines
No EOL
1.7 KiB
C++
56 lines
No EOL
1.7 KiB
C++
#include "color.h"
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#include "ray.h"
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#include "vec3.h"
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#include <iostream>
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int main()
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{
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// Image
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auto aspect_ratio = 16.0 / 9.0;
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int image_width = 400;
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// Calculate the image height, and ensure that it's at least 1.
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int image_height = int(image_width / aspect_ratio);
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image_height = (image_height < 1) ? 1 : image_height;
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// Camera
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auto focal_length = 1.0;
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auto viewport_height = 2.0;
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auto viewport_width = viewport_height * (double(image_width) / image_height);
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auto camera_center = point3(0, 0, 0);
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// Calculate the vectors across the horizontal and down the vertical viewport edges.
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auto viewport_u = vec3(viewport_width, 0, 0);
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auto viewport_v = vec3(0, -viewport_height, 0);
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// Calculate the horizontal and vertical delta vectors from pixel to pixel.
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auto pixel_delta_u = viewport_u / image_width;
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auto pixel_delta_v = viewport_v / image_height;
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// Calculate the location of the upper left pixel.
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auto viewport_upper_left = camera_center - vec3(0, 0, focal_length) - viewport_u / 2 - viewport_v / 2;
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auto pixel00_loc = viewport_upper_left + 0.5 * (pixel_delta_u + pixel_delta_v);
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// Render
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std::cout << "P3\n"
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<< image_width << " " << image_height << "\n255\n";
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for (int j = 0; j < image_height; j++)
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{
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for (int i = 0; i < image_width; i++)
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{
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auto pixel_center = pixel00_loc + (i * pixel_delta_u) + (j * pixel_delta_v);
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auto ray_direction = pixel_center - camera_center;
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ray r(camera_center, ray_direction);
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color pixel_color = ray_color(r);
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write_color(std::cout, pixel_color);
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}
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}
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} |