private void begin(WebPlotView pv, ScreenPt spt) {
WebPlot plot = pv.getPrimaryPlot();
pv.fixScrollPosition();
_mouseInfo.setEnableAllPersistent(true);
_mouseInfo.setEnableAllExclusive(false);
switch (_mode) {
case SELECT:
_firstPt = plot.getImageWorkSpaceCoords(spt);
_currentPt = _firstPt;
break;
case EDIT:
LineSelection sel = (LineSelection) pv.getAttribute(WebPlot.ACTIVE_DISTANCE);
if (sel == null) {
WebAssert.tst(false, "no RecSelection found in plot");
}
ImageWorkSpacePt ptAry[] = new ImageWorkSpacePt[] {sel.getPt1(), sel.getPt2()};
int idx = findClosestPtIdx(plot, ptAry, spt);
if (idx < 0) return;
ScreenPt testPt = plot.getScreenCoords(ptAry[idx]);
double dist = distance(testPt, spt);
if (dist < EDIT_DISTANCE && dist > -1) {
int oppoIdx = idx == 0 ? 1 : 0;
_firstPt = ptAry[oppoIdx];
_currentPt = ptAry[idx];
} else {
_firstPt = plot.getImageWorkSpaceCoords(spt);
_currentPt = _firstPt;
}
break;
case OFF:
releaseMouse();
break;
default:
WebAssert.argTst(false, "only support for SelectType of SELECT EDIT, OFF");
break;
}
}
private int findClosestPtIdx(WebPlot plot, Pt inPtAry[], ScreenPt spt) {
int idx = -1;
ScreenPt ptAry[] = new ScreenPt[inPtAry.length];
for (int i = 0; (i < ptAry.length); i++) {
ptAry[i] = plot.getScreenCoords(inPtAry[i]);
}
double dist = Double.MAX_VALUE;
double testDist;
for (int i = 0; (i < ptAry.length); i++) {
if (ptAry[i] != null) {
testDist = distance(ptAry[i], spt);
if (testDist < dist && testDist > -1) {
dist = testDist;
idx = i;
}
}
}
return idx;
}
