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In this lecture guys I'm gonna show you how to free your animation from these key frames and we are

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going to use the linear interpolation of expression that we have seen in the previous lecture.

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What is gonna be very easy and very simple so let's look a bit at our animation.

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It start at one second and ends at let's make it three seconds here okay.

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In our original one it was less.

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I'm going to make it three seconds for simplicity here and the value is gonna go from zero to 100 percent.

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Let's replace all this with the linear expression.

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I have to click on the stopwatch.

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It's okay if you keep the key frames.

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The expression will override the key frames.

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Now I'm gonna write a linear open brackets the interpolation is gonna be on time of course.

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And the minimum time is 1 as the key frames maximum time is 3 as in the key frames here.

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Minimum value is 0 as in the pie chart to start at 0 a maximum value is at 75 percent or 75 only.

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And let's play the animation here you are cool.

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It's working 100 percent.

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Now we could remove Of course the key frames.

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So actually you have a key frame less animation driven for this slice now.

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Also I can add more than that.

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You're not to see it.

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I hardcoded the minimum time maximum time the minimum value and the maximum value instead of having

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them hardcoded.

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How about if you create a new values control layer and set these values inside the value control layer

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and then pick with them or link them into this expression.

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Here let me show you how it works.

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It's very easy by the way.

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So I'm gonna right click and send you.

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I prefer you use a solid layer which will do.

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Again looking only at the color and make it invisible and rename it a values control.

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By the way guys we could have used the controls layer but this is for clarity now.

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Let's come over to the effect empty set and search for control.

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Of course you have the slider control.

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I click and drag and drop it on the values control.

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So the first one is gonna be the start time or ti minimum if you like.

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If you want to visualize it it's gonna be zero then I'm gonna take another one for t maximum.

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So this is t Mark's.

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I can name them whenever I like by the way and my maximum time according to this animation is three

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seconds.

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Now I have the zero and seventy five.

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I'm not gonna take care of the zero here because it's too obvious.

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I'm gonna take care to the maximum value here.

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So I'm gonna drop in another slider and call this slider by value or by percent.

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We are by percent we do better.

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So this is the percentage for the pie now coming over here.

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I could simply select one from here and pick whippet to the team minimum slider.

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Here you are.

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But not this is going to be a very long expression and it's not cool at all is very hard to read.

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So instead of doing that I'm going to enter certain variables meaning store the value of t me moment

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t maximum inside separate variables and then put these variables over here.

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It's way easy come to the beginning and press Enter or Return on the main keyboard not on the numeric

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pad.

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And I'm gonna say start time that will be s.t. will be equal to and then I will pick up to the minimum

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here.

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Here you are simple at the end of the line I have to put the semicolon just to make sure that we are

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ending the line here.

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Press turn.

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Now I'm gonna take care of the end time.

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I'm gonna put equal and pick whippet to t maximum all the time.

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Here you are.

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In this case it's the three seconds.

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Let's put the semicolon.

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Now I have to take care of the percent which is seventy five which is by percent so I'm gonna write

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a B P that will be by percent equal.

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Of course you can give any kind of letters and numbers here just to create variables name.

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Then I'm gonna pick a bit to the PI percent slider and put the semicolon at the end.

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So now here the expression will be starting time that will be s t.

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Make sure that you have the same spelling for uppercase and lowercase as big d small as Big D small.

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Okay.

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It's very case sensitive here.

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Then ITI that's a nice one.

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I'm gonna leave the zero and write b be as simple as this.

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This click blood come to the beginning.

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But first let's add a value here let's put it at 65 percent and play our animation.

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What is going from 0 to 3 seconds.

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Gonna make it speedier from 1 to 3 seconds.

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Here you are not this is going to start at 1 notice here at 1 and finish as 3 seconds.

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You can change that the spigot.

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Two seconds only.

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Here you are.

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And you know this your animation is running without any key frames.

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If you will up everything with this select roll out everything.

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The only layer now that you need to fill is to change the PI Value is the values control and of course

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now you can change the starting time.

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I'll make a zero point five seconds ending time one second value 50 percent and play

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I need now to work a bit.

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The other layers if you want to push them over his for example and here you are cool guys.

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So actually we are really now in control now.

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It has also become very easy to create more pies here and I show that in the next lecture.