Now

Now

• Chart QScrollView ⇒ QCP zoom/range
• Try Qwt
• QGriLayout or + splitters
• Google:
  • QTableWidget: scroll column content
    • setWigetCell(QScrollArea)
  • QGridLayoyt + splitter
  • QGridLayout + frozen top/bottom/left:
    • QGraphicsAnchorLayout

Zoom

reSize

• ChartArea: QScrollArea
• ChartSizes: fixed
• Axis ranges: fixed, full
• ⊕ Simple
• ⊖ Memory leak:
  • x5 + x5 = +30MB RAM
  • x10 + x10 = +50MB RAM

Y:

• ca.resize: c.resize
• zoom: c.resize, scroller update
• scroll: auto

X:

• ca.resize: scroller update
• zoom: c.resize, scroller update
• scroll: auto

X-Scroller:

• Range + PageStep = QCP width
• Page = Col1
• Range = 0..(QCP-Col1)

reRange:

• ChartArea: QWidget + QHBox (QCP + V-scroller)
• Chart sizes: undefined, auto
• Axis ranges: dynamic, in natural units
• ⊕: Memory unassuming
• ⊖: complex

Y:

• c.resize: scroller update
  • range: nothing to do
  • scroller:
    • page: height()
    • size: page × zoom
    • ptr: recalc
• zoom: [range scale,] scroller update
  • range:
    • size: Ymin..Ymax
    • current: size / zoom
    • start: by scroller.ptr
  • scroller:
    • page: height() (no changes)
    • size: page × zoom
    • ptr: recalc
• scroll: range move

Main idea: 1 scroller step == 1 px

• scroller исчисляется в px

X:

• c.resize: range update + scroller update
• zoom: range scale, scroller update
  • range:
    • size: Xmin..Xmax
    • current: width() / (size × xppu × zoom)
    • ptr: on scroller
  • scroller:
    • size: Xsize * xppu * zoom
    • page:
    • ptr:
• scroll: range move

Main idea: fixed px/sample