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Guys and welcome to this new lecture about expressions we will focus on simple expressions in After



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Effects how to link properties how to link properties with two or three values that we a rate and how



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to link rotation was position scale with rotation.



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And stories like this.



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So let me demonstrate for you here how you can use the expressions in after just a demonstration.



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So the animation itself might not be very meaningful but the expressions will be very meaningful to



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you.



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I want to draw as a rectangle just here a simple rectangle I press control of the net and to put the



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anchor point just in the middle.



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Now I will draw another one another circle just here just for demonstration purpose.



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Could I press control alt and whom to put the anchor point of the letter in the middle.



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Now let's create animation for the circle so this is our circle fine.



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And this is our square.



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We created an image for the circle I placed before position keyframe the position here and go after



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one second for example and move it to the side.



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That's pretty good.



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I can put a couple of frames in between this one up with keyframe it here and moved down from it down



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and something like that so we have a nice butt that you can walk.



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Yes.



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Now we have one set of keyframes for its single path and is doing well.



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Now what I want to do is to take the square here and rotate it while the circle is moving.



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So if the circle goes fast I wanted to go the rotation to go fast and if the circle go slow the rotation



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will go slow.



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Now I cannot use parenting here because parenting would not link a rotation to a position that's not



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possible at reading position to position.



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So I'll come to square and open the rotation.



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I press R and R the rotation here that has a single value.



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You notice the revolutions here the 0 is a cumulative value of the rotation so it has only one value



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and any one value trotted to start writing expressions.



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I will point on the stopwatch press and then it and click it will open the transformation working space.



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If you want it that's a few meters.



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The first one is to enable the expression if you want it on and off.



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This is also for the graph to see your expression before and after the expression in the graph.



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And they have the pick me up and that's the main element we are going to use and have a smaller row



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here like all other small arrows we have seen that will enable you to pick some expressions from the



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expression menu.



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Of course there is a huge number of expressions here.



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And each one of them has its own you know uses but there is no need for you to know all of them just



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know the practical ones and not the concept.



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And then you can really choose what you want to do.



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So to be able to put a value here instead of having transform rotation which is exactly this value I



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will use the pick I would highlight everything inside here which is already highlighted.



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Click on the big trip and drag.



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So now I can choose the whole layer the position and value of the position.



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So most probably I want to use one value which is the x value for example of the position of the circle.



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That's the horizontal one.



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And just release.



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Now if you look at the expression here it is not something very difficult it's actually plain English.



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If you read this comp.



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So it means take from this camp and take from this layer layer called a circle from the transformed



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property.



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They position zero.



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So position is 0 1 not one to remember that in programming it always starts from 0 and then goes 1 to



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3 so position 0 is this position for the circle.



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So from this comp from this layer from the transform take positions.



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And that's it.



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You have now linked the rotation to the present position of the circle.



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If I run it and if you hear you are your square is rotating with the movement of the circle the position



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of the suit.



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Now that's pretty cool.



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That's not exactly what I want you know the animation just stops and is not pretty cool what I want



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to do is force a circle to keep on moving when he comes here at the end.



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I wanted to go back.



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There is a simple expression I can use.



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Now I will come to a position point on the stopwatch press al-Thani and click on the stopwatch.



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It will open the expression for position for the circle.



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I really don't want to write an expression here.



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I want to write a function.



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This is a function I Our write loop out and close brackets.



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Functions always have brackets.



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Now if I click outside it commits and it's OK it has no mistakes.



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Otherwise it just showed me a message here where they got the loop out from.



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That's very easy I could have come to property because loop out is a function that works on property



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and there is loop out here with some parameters that we will see how they work.



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Now if foreign Manumission you notice the loop out has made the circle go back what's happening Zackery



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that loop out will loop all these keyframes as long as it passes the last frame so when it passes the



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Laski frame goes back to the first keyframe and so on.



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OK so that is loop out.



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Now is it not is that loop out of the other Palamedes I can use.



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Now this is not exactly what I want when it comes here it is coming back to the I don't want.



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I wanted to come over here and then go back on the same path you know.



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If I were to do this with keyframes I am really in trouble I have to duplicate this keyframes I don't



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know do a lot of work here.



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Sync them.



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I'm going to use the parameters of loop out one parameter that is very nice and the name is really funny



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is being Ponk.



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That makes sense if you ever played ping pong you know the ball goes on one side goes to the next side



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and so on.



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Let's see how it works now if I play a review here you are going to the left or to the right and then



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coming back on the same path you notice the path here is going.



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That's pretty cool.



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There is another Palamedes I can use here.



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I'll show you just for fun.



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I will come and try to continue



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that's pretty nice.



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Now not what happened at the end of last the last keyframe or at the last keyframe is going to take



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another path to show you nicely I'm going to put this path just overdye.



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OK.



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And I will play.



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Now it goes and then it continues.



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Notice how it's continued when it exited the Laski frame and exit the path it continue in a straight



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line.



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That's pretty cool by the way.



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Let's change our path a bit.



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Let's play with it and see what we can do.



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So we have it here and we take this one up for example and this one up here which will.



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So I'm going to remove continue and write a ping pong again I will open quotes.



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Right.



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Bing bong close and then I can add another Paromita is which keyframe I would write keyframe number



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one.



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OK.



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Actually it's not the first keyframe but you will see.



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Let's take the path so we can see what is going and run a play.



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Notice now it is looping just before the Lossky flip.



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So the one is 1 keyframe before.



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That's pretty cool.



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Look at your animation now.



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After the Laski frame is this looping between the last keyframe and the keyframe before for the rest



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of the composition.



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If you write two and we choose our circle now not as it's looping for the last two keyframes and that's



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pretty interesting let's remove it.



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It's pretty nice.



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Pretty interesting and you can have a path and then you can loop it for the keyframes that you want



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good.



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So I really do that with keyframes.



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I don't think I want to go through it.



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It's pretty difficult because I have to replicate the path to replicate the keyframes and if there is



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any change I have to be very careful about how I'm changing my path here is almost instant.



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I can come and play with my path the way I want and the animation will still be pumping and looping



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the way I designed it.



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That's very cool.



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Now this is nice but not so nice.



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Let's add a few things.



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For example I'm going to add text here.



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That's right.



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One two three and put the anchor point in the middle of the la control and each one.



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And just take the text and use the selection tool and put it under.



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Now what I want is the text to be moving with my small circle here.



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Fine if I use printing look what's going to happen.



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It's going to move with the circle everywhere the circle goes.



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That's pretty nice but that's not what I want.



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What I want is for the text there to move only horizontally while the ball is going up and down.



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So if the ball is moving horizontally the text will move horizontally but it would not move up and down.



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How would I do that.



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First of all let us remove the parenting and we go to a position of course.



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Click on the stopwatch while holding it.



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It will open the expression again I'm going to use the clip.



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Not I didn't write any code until now.



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So I'll take the big leap and go to my circle I say OK I want to go on horizontally.



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So I would link it only to horizontal.



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Now I want you to draw your attention.



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What we have done here is take it to perimeter property and link it to a single parameter not just what



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after effects have done let's play first for now is going you know juggling.



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Why is that.



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Because we require here two parameters to fulfill the position we require.



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The horizontal and vertical Yes I don't want to use the vertical one but it took Temperley time.



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That's a variable.



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It's located the position 0.



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Remember we said 0 1.



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So it took from this camp this player it took transform and from transformed position 0 but now it needs



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to by the balls it duplicate this one.



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So this one really we don't want it.



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So I have several choices here.



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I need to delete this one.



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I can just whip it to original and it will work fine.



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Not just here you are just going horizontal.



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That's pretty cool.



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So while the circle is going up and down and horizontal The text is just going left and right.



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Or isn't.



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If I want to use the transform here and the big whip I could have written value.



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1.



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So value 1 will beat the value 1 from this property value 0 is the X-axis or the horizontal value 1



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is the vertical one.



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And I could replace this with the one.



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It's good to know.



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I prefer that use the equip it's easier the writing value 1 acyclic outside.



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Here we are.



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Everything is working very fine.



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That is called balance.



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You know there is only 1 2 3 and is moving it doesn't make any sense.



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Let's change this.



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Let's go to the text.



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Open source text.



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We're best alternate and click on the stopwatch when enable the expression.



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Not this here because there is nothing to display it give me this red ribbon here with an error message.



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This is not working.



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Don't worry about this as soon as you write a good expression.



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Correct one and then you click outside it will remove all this.



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Now what do I want to put in this text.



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I'm going to use the whip and take it and put the go to circle.



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This is my circle.



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I want to put the value of the Oriental coordinate.



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That is the X and click simply out.



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Here you are.



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Now it's moving left or right is giving me the value.



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If you can see it nicely.



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I don't think so.



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Let's make it a bit slower.



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So we take all this one plus al-Thani and move it for example three seconds.



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Good.



201

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You know this this is a very big figure.



202

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It has so many decimals under it and this is not exactly what you want to display.



203

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So how do we fix that.



204

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That's pretty easy by the way we are going to use another function.



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I will come to the beginning of the lay of this game player and so on.



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I want to round this one so I'll go to the small row here and go to javascript math.



207

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Don't be scared from javascript math.



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Give it big names.



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But really it's nothing.



210

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And I'm going to take the math notrump.



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So the round function has been existing since the 80s with and it appears in the basic language at this



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time.



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So we are going to round the value here but not this hard math that.



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It got me you know the syntax of the function here.



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I need to remove value and close the brackets at the end.



216

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Remember always to close your brackets when you use certain functions or certain Javascript functions.



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If I click out look now it is only around that there is no decimal.



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That's pretty nice.



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OK.



220

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Mine is bigger is big.



221

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It's an example.



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What can I do.



223

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Maybe I want to reduce the value.



224

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This is a lot of value here.



225

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Maybe I want to make it half.



226

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If I come at the end here and say divide by half.



227

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Now I'm doing some arithmetic.



228

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I don't call it math.



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I call it simple arithmetic in the French system divided by two and click out.



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Then it will be divided by two.



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And of course there is the point five that is appearing.



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That is because after I did the math around I divide it by two.



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So it really displayed that value.



234

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But if I wanted to round after division I would put the divided by two inside the math round.



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Pretty simple.



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Just be careful about the it is at the end.



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I click here you are cool now.



238

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So now you have all this and not this we have very few keyframes let's do something else.



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Let's take a rectangle for example and just put the rectangle here.



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Simple and put the anchor point in the middle of the creek think what I want is when this is moving



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the circle is moving left and right or up and down and left and right.



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I want the bat the pad here to move up and down only so I come back to the beginning.



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Of course I cannot parent if I do parent is going to move all over the place with the circle will come



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to my pod.



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So we call this path for example.



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So were writing a game and I will come of course to the transform and position press and then click



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on the stopwatch.



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I have the position now what I want to change here is just the y value you know before we change the



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X-Files.



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So I will use the quip.



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I will go down to the circle and now I will choose the y value of course I'm just repeating it but it's



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important.



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It has taken the y value that position one and replicated so this one we don't want it.



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What we can do is write either value 0 or just click on the whip and just choose the x value or value



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0.



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Now not as what I have done here.



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I've just highlighted the text that I don't want or the whatever variable that is here use the pick



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up and drop it over the ex-buddy.



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And here you are.



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It has replaced the value.



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I click out and let's see what's happening.



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Cool.



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So now the pad here is moving up and down with the circle and the numbers are leaving moving up and



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right now.



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What does all this work is very nice.



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Let's take the circle and if I change the path of the circle right then my whole animation will change



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and I'm not really using any keyframes.



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If I play it here it goes up and down the path the numbers are moving you know left and right.



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And it's really following the motion of the path or the speed of the path.



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So this is about expressions and this is how helpful they can be.



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Of course this is silly example I'm giving you but it's very meaningful if you just understand this



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what have we done.



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If I choose all my layers turn them up and press you for keyframes I have only one set of keyframes



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if I want the whole animation to become slower I press and then it move.



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This for example and everything has become so to speak here or even slowly and I can play in between



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the keyframes that is loop out one two three four whatever I want.



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So if there is changes to be done here it's extremely easy I can just come here and show the path.



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Read this keyframe for example.



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And now you have something totally different yet the rectangle is still turning according to the speed



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of the circle.



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Now I didn't lose the parenting abilities.



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I can come to elipse and put just an ellipse here put down a point in the middle.



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It's not necessary.



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And the ellipse to the square but the square is using the expression to move.



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Still you can pattern to it and you can also get it if you want.



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It would make a lot of trouble but still printing is working.



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I want to draw your attention something very important if you choose all your layers and press the relatively



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fast it will display all your expressions.



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That this is almost English.



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And there is nothing you know difficult about it just to get around it to learn how to use the whip



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to relink the properties together or link one property to another property and be able to understand



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how these things work in the next lecture we will develop on this concept and I will take them one by



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one and I will explain.



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Thanks for listening.



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See you in the next lecture.