histogram_view.cpp
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#include "histogram_view.h"
#include "histogram_controller.h"
#include <assert.h>
#include <cmath>
using namespace Shared;
namespace Statistics {
HistogramView::HistogramView(HistogramController * controller, Store * store, int series, Shared::BannerView * bannerView, KDColor selectedHistogramColor, KDColor notSelectedHistogramColor, KDColor selectedBarColor) :
CurveView(store, nullptr, bannerView, nullptr),
m_controller(controller),
m_store(store),
m_labels{},
m_highlightedBarStart(NAN),
m_highlightedBarEnd(NAN),
m_series(series),
m_selectedHistogramColor(selectedHistogramColor),
m_notSelectedHistogramColor(notSelectedHistogramColor),
m_selectedBarColor(selectedBarColor),
m_displayLabels(true)
{
}
void HistogramView::reload() {
CurveView::reload();
markRectAsDirty(bounds());
}
void HistogramView::reloadSelectedBar() {
CurveView::reload();
float pixelLowerBound = floatToPixel(Axis::Horizontal, m_highlightedBarStart)-2;
float pixelUpperBound = floatToPixel(Axis::Horizontal, m_highlightedBarEnd)+2;
/* We deliberately do not mark as dirty the frame of the banner view to avoid
*unpleasant blinking of the drawing of the banner view. */
KDRect dirtyZone(KDRect(pixelLowerBound, 0, pixelUpperBound-pixelLowerBound,
bounds().height()));
markRectAsDirty(dirtyZone);
}
void HistogramView::drawRect(KDContext * ctx, KDRect rect) const {
m_controller->setCurrentDrawnSeries(m_series);
ctx->fillRect(rect, KDColorWhite);
drawAxes(ctx, rect, Axis::Horizontal);
drawLabels(ctx, rect, Axis::Horizontal, false, !m_displayLabels);
/* We memoize the total size to avoid recomputing it in double precision at
* every call to EvaluateHistogramAtAbscissa() */
float totalSize = m_store->sumOfOccurrences(m_series);
float context[] = {totalSize, static_cast<float>(m_series)};
if (isMainViewSelected()) {
drawHistogram(ctx, rect, EvaluateHistogramAtAbscissa, m_store, context, m_store->firstDrawnBarAbscissa(), m_store->barWidth(), true, m_selectedHistogramColor, m_selectedBarColor, m_highlightedBarStart, m_highlightedBarEnd);
} else {
drawHistogram(ctx, rect, EvaluateHistogramAtAbscissa, m_store, context, m_store->firstDrawnBarAbscissa(), m_store->barWidth(), true, m_notSelectedHistogramColor, m_selectedBarColor);
}
}
void HistogramView::setHighlight(float start, float end) {
if (m_highlightedBarStart != start || m_highlightedBarEnd != end) {
reloadSelectedBar();
m_highlightedBarStart = start;
m_highlightedBarEnd = end;
reloadSelectedBar();
}
}
char * HistogramView::label(Axis axis, int index) const {
return axis == Axis::Vertical ? nullptr : (char *)m_labels[index];
}
float HistogramView::EvaluateHistogramAtAbscissa(float abscissa, void * model, void * context) {
Store * store = (Store *)model;
float totalSize = ((float *)context)[0];
int series = ((float *)context)[1];
return store->heightOfBarAtValue(series, abscissa)/(totalSize);
}
}