Page 55 - 2501_KVS_C-5

Now come back to our game project again.
Step 5: In the figure 5.4, in “go to…” block

“spaceship” option is to be chosen to move
the sprite “missile” to the position of the
sprite “spaceship”. Then “point towards
“spaceship” block is used and after that

“move 40 Steps” block is used to move
the sprite “missile” till edge of the sprite
“spaceship”. So that it looks, as missiles
are coming out of the spaceship nozzle.

Step 6: Now, choose the sprite “spaceship” and
do the following code on it (see figure

5.12). First Set the position of the sprite
“spaceship” at left side with position value
as -200 and y position value as 0 using “go
to x… y…” block. Also set the size of the

spaceship to the 50% of its actual size.
Now do coding in “forever” block, to move
the sprite “spaceship” left, right, up and
down as per the arrow keys pressed. If

the left arrow key press, the sprite will Fig. 5.12
move horizontally in backward direction (left side) by the block “change
x to -10”. The sprite will move horizontally in forward direction (right
side) by the block “change x to 10” block. The sprite will move vertically in

upward direction by the block “change y to 10” block. The sprite will move
vertically in downward direction by the block “change y to -10” block.

Aryan: OK! I understood now how to move the sprite horizontally and vertically
and how the missile will move towards the spaceship, when its clone appears on the
stage. Ok! then what is this “point in direction” block and “key pressed?” block.

Gowri: Aryan, “point in direction” block turns the direction of the sprite
towards left, right, up, down (according to the given value) or towards any
other sprite. And “key pressed?” block is used to check which key is pressed
by us. Lets see “point in direction” block first.

Scratch 53