hyperion.ng/libsrc/hyperion/ImageToLedsMap.cpp
johan d50b46bda2 Fix integration area = 0 for a led
Former-commit-id: b365c4c9605a84ea6b7f88043f6f9c70b7122931
2014-05-06 22:02:40 +02:00

84 lines
2.2 KiB
C++

// STL includes
#include <algorithm>
#include <cmath>
#include <cassert>
// hyperion includes
#include <hyperion/ImageToLedsMap.h>
using namespace hyperion;
ImageToLedsMap::ImageToLedsMap(
const unsigned width,
const unsigned height,
const unsigned horizontalBorder,
const unsigned verticalBorder,
const std::vector<Led>& leds) :
_width(width),
_height(height),
mColorsMap()
{
// Sanity check of the size of the borders (and width and height)
assert(width > 2*verticalBorder);
assert(height > 2*horizontalBorder);
// Reserve enough space in the map for the leds
mColorsMap.reserve(leds.size());
const unsigned xOffset = verticalBorder;
const unsigned actualWidth = width - 2 * verticalBorder;
const unsigned yOffset = horizontalBorder;
const unsigned actualHeight = height - 2 * horizontalBorder;
for (const Led& led : leds)
{
// skip leds without area
if ((led.maxX_frac-led.minX_frac) < 1e-6 || (led.maxY_frac-led.minY_frac) < 1e-6)
{
mColorsMap.emplace_back();
continue;
}
// Compute the index boundaries for this led
unsigned minX_idx = xOffset + unsigned(std::round(actualWidth * led.minX_frac));
unsigned maxX_idx = xOffset + unsigned(std::round(actualWidth * led.maxX_frac));
unsigned minY_idx = yOffset + unsigned(std::round(actualHeight * led.minY_frac));
unsigned maxY_idx = yOffset + unsigned(std::round(actualHeight * led.maxY_frac));
// make sure that the area is at least a single led large
minX_idx = std::min(minX_idx, xOffset + actualWidth - 1);
if (minX_idx == maxX_idx)
{
maxX_idx = minX_idx + 1;
}
minY_idx = std::min(minY_idx, yOffset + actualHeight - 1);
if (minY_idx == maxY_idx)
{
maxY_idx = minY_idx + 1;
}
// Add all the indices in the above defined rectangle to the indices for this led
std::vector<unsigned> ledColors;
for (unsigned y = minY_idx; y<maxY_idx && y<(yOffset+actualHeight); ++y)
{
for (unsigned x = minX_idx; x<maxX_idx && x<(xOffset+actualWidth); ++x)
{
ledColors.push_back(y*width + x);
}
}
// Add the constructed vector to the map
mColorsMap.push_back(ledColors);
}
}
unsigned ImageToLedsMap::width() const
{
return _width;
}
unsigned ImageToLedsMap::height() const
{
return _height;
}