// -------------------------------------------------------------
void Graph::drawLines(int x0, int y0, ViewPainter *p) const
{
float DX_, DY_;
float x1, x2, y1, y2;
auto Scale = p->Scale;
auto Painter = p->Painter;
auto pp = begin();
if(pp->Scr < 0)
pp++;
DX_ = p->DX + float(x0)*Scale;
DY_ = p->DY + float(y0)*Scale;
while(!pp->isGraphEnd()) {
if(pp->Scr >= 0) {
x1 = DX_ + (pp)->Scr*Scale;
y1 = DY_ - (pp+1)->Scr*Scale;
Painter->drawPoint(QPointF(x1, y1));
}
while(!pp->isBranchEnd()) {
x1 = DX_ + (pp)->Scr*Scale;
y1 = DY_ - (pp+1)->Scr*Scale;
pp += 2;
while(!pp->isStrokeEnd()) {
x2 = DX_ + (pp)->Scr*Scale;
y2 = DY_ - (pp+1)->Scr*Scale;
Painter->drawLine(QLineF(x1, y1, x2, y2));
pp += 2;
if(pp->isStrokeEnd()) break;
x1 = DX_ + pp->Scr*Scale;
y1 = DY_ - (pp+1)->Scr*Scale;
Painter->drawLine(QLineF(x2, y2, x1, y1));
pp += 2;
}
if(pp->isBranchEnd()) break;
pp++;
}
pp++;
}
}
int Graph::getSelectedP(int x, int y)
{
float f1,f2,f3,f4;
float xn,yn;
float d1,b1;
auto pp = ScrPoints.begin();
if(pp == ScrPoints.end()) return -1;
if(pp->isStrokeEnd())
pp++;
while(!pp->isGraphEnd()) {
if(!pp->isBranchEnd())
{
f1 = pp->getScrX();
f2 = (pp++)->getScrY();
f3 = pp->getScrX();
f4 = (pp++)->getScrY();
if((f1 > f3 - 5) && (f1 < f3 + 5))
{
xn = f1;
yn = y;
}
else
{
if((f2 > f4 - 5) && (f2 < f4 + 5))
{
xn = x;
yn = f2;
}
else
{
d1 = (f4 - f2) / (f3 - f1);
b1 = f4 - d1 * f3 ;
xn = (float(y) - b1) / d1;
yn = d1 * float(x) + b1;
}
}
if(((f1 >= f3) && (xn >= f3) && (xn <= f1)) || ((f3 >= f1) && (xn >= f1) && (xn <= f3)))
if(((f2 >= f4) && (yn >= f4) && (yn <= f2)) || ((f4 >= f2) && (yn >= f2) && (yn <= f4)))
if((y >= int(yn) - 5) && (y <= int(yn) + 5) && (x >= int(xn) - 5) && (x <= int(xn) + 5))
return 1;
}
else
pp++;
}
return -1;
}
/*!
* Checks if the coordinates x/y point to the graph. returns the number of the
* branch of the graph, -1 upon a miss.
*
* x/y are relative to diagram cx/cy. 5 is the precision the user must point
* onto the graph.
*
* FIXME: should return reference to hit sample point or some context.
*/
int Graph::getSelected(int x, int y)
{
auto pp = ScrPoints.begin();
if(pp == ScrPoints.end()) return -1;
int A, z=0;
int dx, dx2, x1;
int dy, dy2, y1;
int countX = cPointsX.at(0)->count;
if(pp->isStrokeEnd()) {
if(pp->isBranchEnd()) z++;
pp++;
if(pp->isBranchEnd()) {
if(pp->isGraphEnd()) return -1; // not even one point ?
z++;
pp++;
if(pp->isGraphEnd()) return -1; // not even one point ?
}
}
if(Style >= GRAPHSTYLE_STAR || gy!=NULL) {
// for graph symbols
while(!pp->isGraphEnd()) {
if(!pp->isStrokeEnd()) {
dx = x - int((pp)->getScrX());
dy = y - int((pp++)->getScrY());
if(dx < -5) continue;
if(dx > 5) continue;
if(dy < -5) continue;
if(dy > 5) continue;
return z*countX; // points on graph symbol
}
else {
z++; // next branch
pp++;
}
}
return -1;
}
// for graph lines
while(!pp->isGraphEnd()) {
while(!pp->isBranchEnd()) {
x1 = int(pp->getScrX());
y1 = int((pp++)->getScrY());
dx = x - x1;
dy = y - y1;
if(pp->isPt()){
dx2 = int(pp->getScrX());
}else if(pp->isBranchEnd()) {
break;
}else if(pp->isStrokeEnd()) {
pp++;
dx2 = int(pp->getScrX()); // go on as graph can also be selected between strokes
if(pp->isBranchEnd()) break;
}
if(dx < -5) { if(x < dx2-5) continue; } // point between x coordinates ?
else { if(x > 5) if(x > dx2+5) continue; }
dy2 = int(pp->getScrY());
if(dy < -5) { if(y < dy2-5) continue; } // point between y coordinates ?
else { if(y > 5) if(y > dy2+5) continue; }
dx2 -= x1;
dy2 -= y1;
A = dx2*dy - dx*dy2; // calculate the rectangle area spanned
A *= A; // avoid the need for square root
A -= 25*(dx2*dx2 + dy2*dy2); // substract selectable area
if(A <= 0) return z*countX; // lies x/y onto the graph line ?
}
pp++;
z++;
}
return -1;
}
/*!
* draw a (line) graph from screen coord pairs
*/
void Graph::drawLines(int x0, int y0, QPainter *p) const
{
float DX_, DY_;
float x1, y1;
auto Scale = 1; /// \todo p->Scale;
auto Painter = p;
QVector<qreal> dashes;
double Stroke=10., Space=0.;
switch(Style) {
case GRAPHSTYLE_DASH:
Stroke = 10.; Space = 6.;
break;
case GRAPHSTYLE_DOT:
Stroke = 2.; Space = 4.;
break;
case GRAPHSTYLE_LONGDASH:
Stroke = 24.; Space = 8.;
break;
default:
break;
}
QPen pen = Painter->pen();
switch(Style) {
case GRAPHSTYLE_DASH:
case GRAPHSTYLE_DOT:
case GRAPHSTYLE_LONGDASH:
dashes << Stroke << Space;
pen.setDashPattern(dashes);
Painter->setPen(pen);
break;
default:
pen.setStyle(Qt::SolidLine);
break;
}
Painter->setPen(pen);
auto pp = begin();
if(!pp->isPt())
pp++;
/// \todo DX DY
DX_ = /*p->DX*/ + float(x0)*Scale;
DY_ = /*p->DY*/ + float(y0)*Scale;
while(!pp->isGraphEnd()) {
if(pp->isStrokeEnd()) ++pp; // ??
QPainterPath path;
if(pp->isPt()) {
x1 = DX_ + pp->getScrX()*Scale;
y1 = DY_ - pp->getScrY()*Scale;
path.moveTo(x1,y1);
++pp;
}else{
break;
}
while(!pp->isStrokeEnd()) {
x1 = DX_ + pp->getScrX()*Scale;
y1 = DY_ - pp->getScrY()*Scale;
path.lineTo(x1,y1);
++pp;
}
Painter->drawPath(path);
}
}