double MapWindow::LimitMapScale(double value) {
double minreasonable=5.0; // give minreasonable values in system units, in meters! (what you would like to see on the mapscale)
if (mode.Is(Mode::MODE_CIRCLING)) {
// during circling
minreasonable = 50.0;
if ( ISPARAGLIDER ) minreasonable = 10.0;
} else {
// if not circling
minreasonable = 100.0;
if ( ISPARAGLIDER || ISCAR ) minreasonable = 10.0;
if (zoom.AutoZoom()) {
if (AATEnabled && (ActiveWayPoint>0)) {
if ( ISPARAGLIDER ) minreasonable = 10.0; else minreasonable = 1200.0;
} else {
if ( ISPARAGLIDER ) minreasonable = 10.0; else minreasonable = 600.0;
}
}
}
minreasonable = Units::ToUserDistance(minreasonable / 1.4); // 1.4 for mapscale symbol
// return value in user distance units!!!
if (ScaleListCount>0) {
return FindMapScale(max(minreasonable,min(160.0,value))); //maximum limit in user distance units!
} else {
return max(minreasonable,min(160.0,value)); //maximum limit in user distance units!
}
}
fixed
MapWindowProjection::StepMapScale(const fixed scale, int Step) const
{
int i = FindMapScale(scale) + Step;
i = max(0, min((int)ScaleListCount - 1, i));
return CalculateMapScale(i);
}
/**
* @brief Modifies current zoom ratio
*
* @param vswitch Modifier value:
*/
void MapWindow::Zoom::EventScaleZoom(int vswitch)
{
if (IsMultiMapNoMain() && !INPAN) {
if (vswitch>0)
LKevent=LKEVENT_UP;
else
LKevent=LKEVENT_DOWN;
return;
}
// disable AutoZoom if possible
if(_autoZoom &&
mode.Special() == Mode::MODE_SPECIAL_NONE &&
!(_circleZoom && mode.Is(Mode::MODE_CIRCLING))) {
// Disable Auto Zoom only if not in Special or Circling Zoom
DoStatusMessage(gettext(TEXT("_@M857_"))); // AutoZoom OFF
_autoZoom = false;
}
// For best results, zooms should be multiples or roots of 2
double value = *_requestedScale;
if(ScaleListCount > 0) {
value = FindMapScale(*_requestedScale);
value = StepMapScale(-vswitch);
}
else {
if (abs(vswitch)>=4) {
if (vswitch==4)
vswitch = 1;
if (vswitch==-4)
vswitch = -1;
}
if (vswitch==1) { // zoom in a little
value /= 1.414;
}
if (vswitch== -1) { // zoom out a little
value *= 1.414;
}
if (vswitch==2) { // zoom in a lot
value /= 2.0;
}
if (vswitch== -2) { // zoom out a lot
value *= 2.0;
}
}
double _lastRequestedScale = *_requestedScale;
*_requestedScale = LimitMapScale(value);
if(*_requestedScale != _lastRequestedScale) {
RefreshMap();
}
}
fixed
MapWindowProjection::LimitMapScale(const fixed value) const
{
return HaveScaleList() ? CalculateMapScale(FindMapScale(value)) : value;
}
