Arrows in a display

When you create an arrow you draw a rectangle that defines the length and orientation (vertical or horizontal) of the arrow's path. This is not displayed at runtime. The arrow's position within the rectangle is determined by the expression and is proportional to the expression's minimum and maximum values. For example, if a tank with a thousand gallon capacity is being monitored, the expression's minimum and maximum values would be 0 and 1000. If the tank is 50% full, the arrow will be halfway between the bottom and top of the rectangle.

You can use an arrow with simple graphic objects to create a gauge or indicator. For example, you could create an arrow that moves vertically, pointing to the right, and beside it draw a vertical scale representing the capacity of a tank that is being monitored. As the tag's value changes the arrow will move so that it points to the current fill level of the tank.

An arrow with a vertical path moves from the bottom of the rectangle, representing the minimum value, to the top, representing the maximum value. The default is for it to point to the right. Use Flip Horizontal on the Arrange menu to change the direction in which the arrow points.

An arrow with a horizontal path arrow moves from the left, representing the minimum value, to the right. The default is for it to point up. Use Flip Vertical on the Arrange menu to change the direction in which the arrow points.

If the expression evaluates to less than or equal to the minimum value, the arrow is at the bottom of the rectangle if it is vertical, or left side if the rectangle is horizontal. If the value is equal to or greater than the maximum value the arrow is at the top or right side.