84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
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#include "map_horizon.h"
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#include "map_height.h"
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MapHorizon::MapHorizon(PNM* img) :
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Transformation(img)
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{
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}
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MapHorizon::MapHorizon(PNM* img, ImageViewer* iv) :
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Transformation(img, iv)
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{
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}
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PNM* MapHorizon::transform()
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{
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int width = image->width(),
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height = image->height();
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double scale = getParameter("scale").toDouble();
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int sun_alpha = getParameter("alpha").toInt();
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int dx, dy;
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switch (getParameter("direction").toInt())
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{
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case NORTH: dx = 0; dy = -1; break;
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case SOUTH: dx = 0; dy = 1; break;
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case EAST: dx = 1; dy = 0; break;
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case WEST: dx = -1; dy = 0; break;
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default:
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qWarning() << "Unknown direction!";
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dx = 0;
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dy = -1;
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}
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PNM* newImage = new PNM(width, height, image->format());
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MapHeight* mapHeight = new MapHeight(image);
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image = mapHeight->transform();
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for (int i = 0; i < width; i++)
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{
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for (int j = 0; j < height; j++)
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{
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double alpha = 0;
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int current_h = qGray(image->pixel(i, j));
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for (int k = i + dx, l = j + dy; k < width && l < height && k >= 0 && l >= 0; k = k + dx, l = l + dy)
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{
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int ray_h = qGray(image->pixel(k, l));
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if (current_h < ray_h)
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{
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double dist = sqrt(pow(k - i, 2) + pow(l - j, 2)) * scale;
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double ray_alpha = atan((ray_h - current_h) / dist);
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if (ray_alpha > alpha)
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{
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alpha = ray_alpha;
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}
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}
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}
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double delta = alpha - sun_alpha * M_PI / 180;
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if (delta > 0)
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{
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double val = cos(delta) * 255;
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QColor color = QColor(val, val, val);
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newImage->setPixel(i, j, color.rgb());
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}
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else
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{
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QColor color = QColor(255, 255, 255);
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newImage->setPixel(i, j, color.rgb());
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}
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}
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}
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return newImage;
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}
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