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>> SPEAKER: Thus far, Scratch has pretty
much been on autopilot.

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Let's make this program a little more
interactive, such that Scratch will

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only meow when I pet him, as by moving
my mouse cursor over the cat.

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>> Let's begin.

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When green flag clicked, forever,
let's do the following.

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If I detect that the mouse pointer is
over the cat, I need to sense that.

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So let's grab the touching
Boolean expression.

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Change it to mouse pointer.

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So if while doing this forever, the
sprite is touching the mouse pointer,

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I want to go and meow
like a happy cat.

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>> Let's give Scratch a moment to catch
his breath as usual, upping the

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default one second to two seconds.

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Now let's click that green flag.

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Hmm.

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Nothing's happening.

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But that's because nothing's
touching the cat yet.

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So let's move my mouse
pointer over him.

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>> SCRATCH: [MEOWING].

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>> SPEAKER: Hmm.

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>> SCRATCH: [MEOWING].

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>> SPEAKER: Hmm.

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>> SCRATCH: [MEOWING].

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That's a happy cat.

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