Flash Game Study Notes: move the mouse

1. Package
2. {
5. Public class mousegame extends Sprite
6. {
7. Private VaR _ sprite: SPRITE;
8. Private var posion: point;
9. Public Function mousegame ()
10. {
12. _ Sprite = new sprite ();
13. Addchild (_ sprite );
14. VaR _ shape: Shape = new shape ();
15. Addchild (_ shape );
17. _ Shape. Graphics. beginfill (0 x, 1 );
18. _ Shape. Graphics. linestyle (1, 0, 1 );
19. _ Shape. Graphics. drawcircle (250,250, 50 );
20. _ Shape. Graphics. endfill ();
22. _ Sprite. addchild (_ shape );
23. _ Sprite. addeventlistener (mouseevent. mouse_down, startmascotdrag );
24. Stage. addeventlistener (mouseevent. mouse_up, stopmascotdrag );
25. _ Sprite. addeventlistener (event. enter_frame, dragmascot );
26. }
27. Private function startmascotdrag (E: mouseevent): void
28. {
29. Posion = new point (E. localx, E. localy); // save a vertex in this object
32. }
33. Private function stopmascotdrag (E: mouseevent): void
34. {
35. Posion = NULL;
37. }
38. Private function dragmascot (E: Event): void
39. {
40. If (posion! = NULL)
41. {
42. _ Sprite. x = mousex-posion. X;
43. _ Sprite. Y = mousey-posion. Y;
44. }
45. }
46. }
47. }

 

Code parsing:

First, we create a class to continue Sprite, and draw a circle in the constructor. we can listen to the mouse and drag the circle.

1. Here we mainly use
2. Import flash. display. Sprite;
3. Import flash. Events .*;
4. Import flash. Geom. Point;
5. Import flash. display. shape;
6. Four packages. Have you noticed import flash. Geom. Point; which can be recorded?
7. In fact, it is very useful to discover this carefully. This function saves the coordinates of a vertex.

How to Create a circle:

1. VaR _ shape: Shape =NewSHAPE ();

2. Addchild (_ shape );
3. _ Shape. Graphics. beginfill (0 x, 1); // fill in the black color with a transparency of 1
5. _ Shape. Graphics. linestyle (, 1); // you can specify the line thickness and transparency.
6. _ Shape. Graphics. drawcircle (250,250, 50); // circle
7. _ Shape. Graphics. endfill (); // end Filling

2. Can I drag the circle?

 

First, we perform some listeners.

2. _ Sprite. addeventlistener (mouseevent. mouse_down, startmascotdrag );
4. Stage. addeventlistener (mouseevent. mouse_up, stopmascotdrag );
5. _ Sprite. addeventlistener (event. enter_frame, dragmascot );

Two mouse events, one being pressed, the other being not pressed, and the other being a function for dragging.

 

Iii. Computing location

Subtraction

New coordinates = current mouse value-original coordinates

In this way, you can complete a simple mouse drag

 

Iv. Expansion

 

Try some games that interact with the mouse

Well, I am exhausted.