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#include "qcontour.h"
#include <float.h>
#include <math.h>
#include <QLabel>
#include <QDebug>
QContour::QContour(double *values, int w, int h)
: valueMap(ValueMap(values,w,h)), plotColor(Qt::green), plotThickness(2), style(Qt::SolidLine)
{
vmin = DBL_MAX;
vmax = -DBL_MAX;
if(values)
{
for(int i=0; i<w; i++)
{
for(int j=0; j<h; j++)
{
double v = values[j*w+i];
if(vmin > v) vmin = v;
if(vmax < v) vmax = v;
}
}
}
if(vmax==vmin)
{
vmax += 0.1f;
vmin -= 0.1f;
}
if(vmax-vmin < 1e-10)
{
double vdiff = 1e-10;
double vcenter = (vmax-vmin)*0.5f;
vmax = vcenter + vdiff*0.5f;
vmin = vcenter - vdiff*0.5f;
}
}
double QContour::meanValue(int xStart, int xEnd, int yStart, int yEnd)
{
int w = valueMap.w, h = valueMap.h;
if(xStart>=w) xStart = w-1;
if(yStart>=h) yStart = h-1;
if(xEnd>w) xEnd = w;
if(yEnd>h) yEnd = h;
if(xStart<0) xStart = 0;
if(yStart<0) yStart = 0;
if(xEnd==xStart) xEnd = xStart+1;
if(yEnd==yStart) yEnd = yStart+1;
double accumulator = 0;
int cnt=0;
for(int i=xStart; i<xEnd; i++)
{
for(int j=yStart; j<yEnd; j++)
{
accumulator += valueMap.value(i,j);
cnt++;
}
}
accumulator /= cnt;
return accumulator;
}
double QContour::meanValue(QRect rect)
{
return meanValue(rect.x(), rect.x()+rect.width(), rect.y(), rect.y()+rect.height());
}
void QContour::ShowValueImage()
{
int w = valueMap.w, h = valueMap.h;
QImage image(w,h,QImage::Format_RGB32);
double vdiff = vmax - vmin;
for(int i=0; i<w; i++)
{
for(int j=0; j<h; j++)
{
int value = (int)((valueMap.value(i, j)-vmin)/vdiff*255);
value = max(0,min(255,value));
image.setPixel(i,j, qRgb((int)value,value,value));
}
}
QPixmap contourPixmap = QPixmap::fromImage(image).scaled(512,512, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
QLabel *lab = new QLabel();
lab->setPixmap(contourPixmap);
lab->show();
}
void QContour::Paint(QPainter &painter, int levels, int zoom)
{
if(vmin == vmax) return;
CContourMap map;
levels = (int)(levels*sqrt(zoom));
map.generate_levels(vmin,vmax,levels);
map.contour(&valueMap);
//map.dump();
map.consolidate(); // connect all the lines
//map.dump();
int w = valueMap.w, h = valueMap.h;
int hmo = h-1;// we take out the last line as it will mess up the computations
int wmo = w-1;// we take out the last line as it will mess up the computations
int W = painter.viewport().width();
int H = painter.viewport().height();
QList<QPainterPath> paths;
QList<double> altitudes;
for(int i=0; i<levels; i++)
{
CContourLevel *level = map.level(i);
if(!level || !level->contour_lines) continue;
for(int j=0; j<level->contour_lines->size(); j++)
{
CContour *line = level->contour_lines->at(j);
vector<SPoint> points = line->contourPoints();
QPointF oldPoint;
int emptyCount = 0;
QPainterPath path;
for(int p=0; p<points.size(); p++)
{
QPointF point(points[p].x*W/wmo, points[p].y*H/hmo);
if(p)
{
path.lineTo(point);
// painter.drawLine(point, oldPoint);
QPointF diff = point - oldPoint;
if(diff.x() == 0 || diff.y() == 0) emptyCount++;
}
else path.moveTo(point);
if(emptyCount > points.size()*0.2f) break;
oldPoint = point;
}
if(emptyCount / (float) points.size() > 0.2) continue; // we dont want stuff that has loads of empty segments
paths.push_back(path);
}
altitudes.push_back(map.alt(i));
}
painter.setRenderHint(QPainter::Antialiasing);
painter.setBrush(Qt::NoBrush);
for(int i=0; i<min(paths.size(),300); i++)
{
painter.setPen(QPen(plotColor, 0.25 + i/(double)paths.size()*plotThickness, style));
painter.drawPath(paths.at(i));
//qDebug() << "path length:" << paths.at(i).length();
}
if(bDrawColorbar)
{
// we draw the colorbar
painter.setRenderHint(QPainter::Antialiasing, false);
painter.setOpacity(0.8);
int barW = 20;
QRect rect(W - barW - 16, 16, barW, H-32);
painter.setBrush(Qt::NoBrush);
for(int i=0; i<rect.height(); i++)
{
double v = (1. - i/(double)rect.height())*255.;
v = max(0.,min(255.,v));
painter.setPen(QColor(v,v,v));
painter.drawLine(rect.x(), rect.y() + i, rect.x() + rect.width(), rect.y() + i);
}
// we draw the altitude lines
for(int i=0; i<altitudes.size(); i++)
{
double v = altitudes[i];
v = (v-vmin)/(vmax-vmin);
int y = (int)(v*rect.height()) + 16;
painter.setPen(QPen(Qt::green, 3.25 - i/(double)altitudes.size()*3));
painter.drawLine(rect.x(), y, rect.x()+rect.width(), y);
}
const double multiplier = 1000.; // this is to avoid numerical instabilities
// we draw the values on the colorbar
QFontMetrics fm = painter.fontMetrics();
QFont font = painter.font();
font.setPointSize(9);
painter.setFont(font);
painter.setOpacity(1);
int steps = 10;
bool bShortFormat = true;
if(fabs(vmax/multiplier) < 1e-6 && fabs(vmin/multiplier) < 1e-6) bShortFormat = false;
for(int i=0; i<steps+1; i++)
{
double v = (1.f - i/(double)steps);
double value = (v*(vmax-vmin) + vmin)/multiplier;
QString text;
if(bShortFormat) text = QString("%1").arg(value, 0, 'g', 4);
else text = QString("%1").arg(value, 0, 'f', 4);
int y = rect.y() + i*rect.height()/steps;
QRect boundingRect = fm.boundingRect(text);
QRect textRect = QRect(rect.x()-boundingRect.width()-6, y - boundingRect.height()/2, boundingRect.width(), boundingRect.height());
// to decide if we write stuff in white or black
QRect testRect = QRect(textRect.x()*w/W, textRect.y()*h/H, textRect.width()*w/W, textRect.height()*h/H);
double mean = meanValue(testRect);
mean = (mean-vmin)/(vmax-vmin);
painter.setPen((mean>0.5)? Qt::black : Qt::white);
painter.drawText(textRect, Qt::AlignRight + Qt::AlignVCenter, text);
painter.drawLine(rect.x(), y, rect.x()-4, y);
}
// we decide if we write stuff in white or black
double mean = meanValue(QRect((rect.x()-40)*w/W, rect.y()*h/H, (40-6)*w/W, rect.height()*h/H));
painter.setPen(QPen(mean>0.5?Qt::black:Qt::white, 1));
painter.drawRect(rect);
}
}
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