46 lines
1.1 KiB
C++
46 lines
1.1 KiB
C++
#include "widgetterrainbasenoisepreview.h"
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#include <QPainter>
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#include <QPaintEvent>
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#include "tools.h"
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WidgetTerrainBaseNoisePreview::WidgetTerrainBaseNoisePreview(QWidget* parent) :
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QWidget(parent)
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{
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_noise = NULL;
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}
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void WidgetTerrainBaseNoisePreview::setNoise(NoiseGenerator* noise)
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{
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_noise = noise;
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update();
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}
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void WidgetTerrainBaseNoisePreview::paintEvent(QPaintEvent* event)
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{
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QPainter painter(this);
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painter.setBrush(Qt::SolidPattern);
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painter.drawRect(rect());
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int height = this->height();
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if (_noise)
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{
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QRect boundaries = event->region().boundingRect();
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double value, factor;
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double minvalue, maxvalue;
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noiseGetRange(_noise, &minvalue, &maxvalue);
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factor = ((double)height) / (maxvalue - minvalue);
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for (int x = boundaries.left(); x <= boundaries.right(); x++)
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{
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value = noiseGet1DTotal(_noise, 100.0 * ((double)x) / factor);
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painter.setPen(Qt::white);
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painter.drawLine(x, height - 1 - (value - minvalue) * factor, x, height - 1);
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}
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}
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}
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