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3: Zoom in/out should try its best to keep cursor at the same position 

Task-Url: https://github.com/eyck/txviewer/issues/issue/3
This commit is contained in:
Eyck Jentzsch 2015-11-22 12:07:50 +01:00
parent 6ff48cac7a
commit 929cf21ff8
1 changed files with 18 additions and 2 deletions
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16
com.minres.scviewer.database.ui.swt/src/com/minres/scviewer/database/swt/internal/WaveformCanvas.java
View File

@ -222,12 +222,28 @@ public class WaveformCanvas extends Canvas {
}
public void setZoomLevel(int level) {
long oldScaleFactor=scaleFactor;
if(level<unitMultiplier.length*unitString.length){
this.level = level;
this.scaleFactor = (long) Math.pow(10, level/2);
if(level%2==1) this.scaleFactor*=3;
ITx tx = arrowPainter.getTx();
arrowPainter.setTx(null);
/*
* xc = tc/oldScaleFactor
* xoffs = xc+origin.x
* xcn = tc/newScaleFactor
* t0n = (xcn-xoffs)*scaleFactor
*/
long tc=cursorPainters.get(0).getTime(); // cursor time
long xc=tc/oldScaleFactor; // cursor total x-offset
long xoffs=xc+origin.x; // cursor offset relative to left border
long xcn=tc/scaleFactor; // new total x-offset
long originX=xcn-xoffs;
if(originX>0)
origin.x=(int) -originX; // new cursor time offset relative to left border
else
origin.x=0;
syncScrollBars();
arrowPainter.setTx(tx);
redraw();