49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
#include "RenderTarget.hpp"
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namespace frame::render
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{
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RenderTarget::RenderTarget(Size size)
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: image(size)
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{
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}
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void RenderTarget::DrawPixel(Vector const& position, Color color)
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{
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image.at(position.x, position.y) = color;
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}
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void RenderTarget::DrawLine(Vector const& start,
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Vector const& end,
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Color color)
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{
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auto const deltaX = std::abs(start.x - end.x);
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auto const deltaY = std::abs(start.y - end.y);
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auto const rX = start.x < end.x ? 1 : -1;
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auto const rY = start.y < end.y ? 1 : -1;
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auto pos = start;
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auto E = 2 * deltaY - deltaX;
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DrawPixel(pos, color);
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while(pos != end)
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{
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if(E <= 0)
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{
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pos.x += rX;
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E += 2 * deltaY;
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} else
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{
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pos.x += rX;
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pos.y += rY;
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E += 2 * deltaY - 2 * deltaX;
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}
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DrawPixel(pos, color);
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}
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}
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} // namespace frame::render
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