Golang Scale.GetValue Examples

Example #1

File: scaledview.go Project: axel-freesp/sge

func scalerValueCallback(r *gtk.Scale, v *ScaledView) {
	oldScale := v.scale
	oldX := v.scene.hadj.GetValue()
	oldY := v.scene.vadj.GetValue()
	visMx := float64(v.layoutBox.GetAllocatedWidth()) / 2.0
	visMy := float64(v.layoutBox.GetAllocatedHeight()) / 2.0
	v.scale = math.Exp2(r.GetValue())
	newW, newH := v.guest.Update()
	v.scene.hadj.SetUpper(float64(newW))
	v.scene.vadj.SetUpper(float64(newH))
	v.scene.hadj.SetValue((oldX+visMx)*v.scale/oldScale - visMx)
	v.scene.vadj.SetValue((oldY+visMy)*v.scale/oldScale - visMy)
}