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Trim: GraphPixelsPerPoint mush remain a power of zoom_offset

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This commit is contained in:
Philippe Teuwen 2020-10-05 10:07:16 +02:00
commit 4eef1f1bff
1 changed files with 7 additions and 1 deletions
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8
client/src/proxguiqt.cpp
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@ -689,13 +689,19 @@ void Plot::Move(int offset) {
void Plot::Trim(void) {
uint32_t lref, rref;
const double zoom_offset = 1.148698354997035; // 2**(1/5)
if ((CursorAPos == 0) || (CursorBPos == 0)) { // if we don't have both cursors set
lref = GraphStart;
rref = GraphStop;
} else {
lref = CursorAPos < CursorBPos ? CursorAPos : CursorBPos;
rref = CursorAPos < CursorBPos ? CursorBPos : CursorAPos;
GraphPixelsPerPoint = GraphPixelsPerPoint * (GraphStop - GraphStart) / (rref - lref);
// GraphPixelsPerPoint mush remain a power of zoom_offset
double GPPPtarget = GraphPixelsPerPoint * (GraphStop - GraphStart) / (rref - lref);
while (GraphPixelsPerPoint < GPPPtarget) {
GraphPixelsPerPoint *= zoom_offset;
}
GraphPixelsPerPoint /= zoom_offset;
CursorAPos -= lref;
CursorBPos -= lref;
}