private void DoZoom(double deltaZoom, int mod, Point origoPosition, Point startHandlePosition, Point targetHandlePosition, bool setDelta = false)
{
var startZoom = Zoom;
var currentZoom = setDelta ? deltaZoom : (mod == -1 ? (startZoom / deltaZoom) : (startZoom * deltaZoom));
currentZoom = Math.Max(MinZoom, Math.Min(MaxZoom, currentZoom));
var startTranslate = new Point(TranslateX, TranslateY);
var v = startHandlePosition.Subtract(origoPosition);
var vTarget = targetHandlePosition.Subtract(origoPosition);
var targetPoint = v.Subtract(startTranslate).Div(startZoom);
var zoomedTargetPointPos = targetPoint.Mul(currentZoom).Sum(startTranslate);
var endTranslate = vTarget.Subtract(zoomedTargetPointPos);
if (setDelta)
{
var transformX = GetCoercedTranslate(endTranslate.X);
var transformY = GetCoercedTranslate(endTranslate.Y);
DoZoomAnimation(currentZoom, transformX, transformY);
}
else
{
var transformX = GetCoercedTranslate(TranslateX + endTranslate.X);
var transformY = GetCoercedTranslate(TranslateY + endTranslate.Y);
DoZoomAnimation(currentZoom, transformX, transformY);
}
Mode = ZoomControlModes.Custom;
}
private void DoZoom(double deltaZoom, int mod, Point origoPosition, Point startHandlePosition, Point targetHandlePosition, bool setDelta = false)
{
var startZoom = Zoom;
var currentZoom = setDelta ? deltaZoom : (mod == -1 ? (startZoom / deltaZoom) : (startZoom * deltaZoom));
currentZoom = Math.Max(MinZoom, Math.Min(MaxZoom, currentZoom));
var startTranslate = new Point(TranslateX, TranslateY);
var v = startHandlePosition.Subtract(origoPosition);
var vTarget = targetHandlePosition.Subtract(origoPosition);
var targetPoint = v.Subtract(startTranslate).Div(startZoom);
var zoomedTargetPointPos = targetPoint.Mul(currentZoom).Sum(startTranslate);
var endTranslate = vTarget.Subtract(zoomedTargetPointPos);
if (setDelta)
{
var transformX = GetCoercedTranslate(endTranslate.X);
var transformY = GetCoercedTranslate(endTranslate.Y);
DoZoomAnimation(currentZoom, transformX, transformY);
}
else
{
var transformX = GetCoercedTranslate(TranslateX + endTranslate.X);
var transformY = GetCoercedTranslate(TranslateY + endTranslate.Y);
DoZoomAnimation(currentZoom, transformX, transformY);
}
Mode = ZoomControlModes.Custom;
}
