Difference between revisions of "Conditional Visibility"
m |
m |
||
Line 1: | Line 1: | ||
<noinclude>{{Manual Page|version=5.0}}</noinclude> | <noinclude>{{Manual Page|version=5.0}}</noinclude> | ||
{{objects|advanced}} | {{objects|advanced}} | ||
− | Apart from just showing or hiding certain objects you can also have their visibility status depend on a certain condition. For example, you would like an object to appear on screen if you check a checkbox positioned in the [[Graphics View]] or if a [[Slider Tool|slider]] is changed to a certain value. | + | Apart from just showing or hiding certain objects you can also have their visibility status depend on a certain condition. For example, you would like an object to appear on screen if you check a checkbox positioned in the [[File:Menu view graphics.svg|link=|16px]] [[Graphics View]] or if a [[File:Mode slider.svg|link=|24px]] [[Slider Tool|slider]] is changed to a certain value. |
==Conditionally Show or Hide Existing Objects== | ==Conditionally Show or Hide Existing Objects== | ||
− | You can use the [[ | + | You can use the [[File:Mode showcheckbox.svg|link=|24px]] [[Check Box Tool]] in order to create a checkbox that controls the visibility of one or more existing objects on screen. |
− | Alternatively, you could also create a [[Boolean values|Boolean variable]] (e. g. | + | Alternatively, you could also create a [[Boolean values|Boolean variable]] (e.g. <code>b = true</code>) using the [[Input Bar]] and make it visible as a checkbox in the [[Graphics View]] by changing its visibility status (e.g. use [[File:Mode showhideobject.svg|link=|24px]] [[Show / Hide Object Tool]] or the [[Context Menu]]). In order to use this Boolean variable as a condition for the visibility of certain objects, you need to follow the steps described below. |
==Changing the Visibility of Newly Created Objects== | ==Changing the Visibility of Newly Created Objects== | ||
In the [[Properties Dialog]], you can enter a condition for the visibility of an object on tab Advanced. | In the [[Properties Dialog]], you can enter a condition for the visibility of an object on tab Advanced. | ||
− | {{note|You can select the logic operators (e. g. | + | {{note|You can select the logic operators (e.g. ≠, ≥, ˄, ‖) from the drop down list in order to create your conditional statements.}} |
{{example| | {{example| | ||
* If a is a slider, then the conditional statement a < 2 means that the corresponding object is only shown in the Graphics View if the slider value is less than 2. | * If a is a slider, then the conditional statement a < 2 means that the corresponding object is only shown in the Graphics View if the slider value is less than 2. |
Revision as of 09:47, 4 August 2015
Apart from just showing or hiding certain objects you can also have their visibility status depend on a certain condition. For example, you would like an object to appear on screen if you check a checkbox positioned in the Graphics View or if a slider is changed to a certain value.
Conditionally Show or Hide Existing Objects
You can use the Check Box Tool in order to create a checkbox that controls the visibility of one or more existing objects on screen.
Alternatively, you could also create a Boolean variable (e.g. b = true
) using the Input Bar and make it visible as a checkbox in the Graphics View by changing its visibility status (e.g. use Show / Hide Object Tool or the Context Menu). In order to use this Boolean variable as a condition for the visibility of certain objects, you need to follow the steps described below.
Changing the Visibility of Newly Created Objects
In the Properties Dialog, you can enter a condition for the visibility of an object on tab Advanced.
- If a is a slider, then the conditional statement a < 2 means that the corresponding object is only shown in the Graphics View if the slider value is less than 2.
- If b is a Boolean variable, you can use b as a conditional statement. The corresponding object is shown whenever the value of b is true and is hidden when the value of b is false.
- If g and h are two lines and you would like a text to be shown whenever these lines are parallel, then you could use g ‖ h as a conditional statement for the text.