Made to Order Software Corporation - pointer

Start Drag

Alexis Wilke — Wed, 06 Jan 2010 06:29:56 +0000

SWF Action

Action Category:

Movie

Action Details:

Action Identifier:

Action Structure:

<n.a.>

Action Length:

0 byte(s)

Action Stack:

pop 1 (s), pop 2 (b), if (b3) { pop 4 (n) }

Action Operation:

s₁ := pop();
b₂ := pop();
b₃ := pop();
if(b₃) {
    n₄ := pop();
    n₅ := pop();
    n₆ := pop();
    n₇ := pop();
    s₁.start_drag(b₂, n₄, n₅, n₆, n₇);
}
else {
    s₁.start_drag(b₂);
}

Action Flash Version:

See Also:

Stop Drag

Pop a target (sprite, movie, thread) name s₁.

Pop a first Boolean b₂, which, when true, means that the mouse pointer is locked to the center of the object being dragged.

Push Data

Alexis Wilke — Sun, 03 Jan 2010 04:45:16 +0000

SWF Action

Action Category:

Stack

Action Details:

Action Identifier:

150

Action Structure:

struct {
	unsigned char   f_type
	<type>          f_data
} f_push_data[<variable>];

Action Length:

-1 byte(s)

Action Stack:

push <variable> (a)

Action Operation:

a₁ = f_data[0];1
push(a₁);
a₂ = f_data[1];
push(a₂);
a₃ = f_data[2];
push(a₃);
...
a_n = f_data[n];
push(a_n);

1. Notice that the first data in the action is the last accessible on your stack.

Action Flash Version:

See Also:

Duplicate

Pop

Swap

Push some immediate data on the stack. This action was introduced in V4.0. The supported data types vary depending on the version of the player you have. As many values as necessary can be pushed at once. The f_push_data structure will be repeated multiple times as required. For instance, to push two strings on the stack at once, you would use the following code:

Sprite Properties

Alexis Wilke — Wed, 30 Dec 2009 02:34:07 +0000

The following is the list of currently accepted properties or fields for the Get Property and the Set Property actions. Note that the properties can be specified with either an integer (type 7, requires V5.0+) or a single precision floating point (type 1, V4.0 compatible). And since strings are automatically transformed in a value when required, one can use a string to represent the property number (type 0).

Branch If True

Alexis Wilke — Wed, 23 Dec 2009 03:53:36 +0000

SWF Action

Action Category:

Control

Action Details:

Action Identifier:

157

Action Structure:

signed short f_offset;

Action Length:

2 byte(s)

Action Stack:

pop 1 (b)

Action Operation:

b₁ := pop();
if(b₁) {
ip += f_offset; // ip past the branch action
}

Action Flash Version:

See Also:

Branch Always

Return

Pop a Boolean value; if true then jump to the specified action; otherwise continue with the following actions.

There is no Branch If False action. Instead, first use the Logical Not, then Branch If True.

IMPORTANT NOTES

Branch Always

Alexis Wilke — Fri, 18 Dec 2009 10:22:40 +0000

SWF Action

Action Category:

Control

Action Details:

Action Identifier:

153

Action Structure:

signed short f_offset;

Action Length:

2 byte(s)

Action Stack:

n.a.

Action Operation:

ip += f_offset; // ip past the branch action

Action Flash Version:

See Also:

Branch If True

Return

Jump to the specified action. The offset is added to the current execution pointer as it is after reading the branch instruction.

IMPORTANT NOTES

The offset must be such that when added to the current execution pointer it points to a valid action (i.e. you cannot jump in the middle of a Push Data or any other multi-byte action.)

Pointers and proper exception handling...

Alexis Wilke — Tue, 03 Jun 2008 04:57:00 +0000

Many C++ programmers have been C programmers first. Therefore, a lot of times, you find statements written this way:

ptr = new type;

if(ptr == 0) // handle error...

This is a C programmer that does not yet know that the new operator will throw an error if the allocation cannot happen. This makes a lot of sense, but what does that mean to the C++ programmer?