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Thore Böckelmann edited this page Oct 11, 2021 · 4 revisions

Dtpic.mui

Super class

Area.mui

Background

The Dtpic class allows including arbitrary images loadable using datatypes.library in MUI applications. One just as to provide the file name of an image. Everything else is handled by the Dtpic class. Full transparency and alpha channel is supported.

Attributes

Attribute Version ISG Type
MUIA_Dtpic_Alpha V20 ISG LONG
MUIA_Dtpic_DarkenSelState V20 I.G BOOL
MUIA_Dtpic_Fade V20 ISG LONG
MUIA_Dtpic_LightenOnMouse V20 I.G BOOL
MUIA_Dtpic_Name V18 ISG STRPTR

MUIA_Dtpic_Alpha

NAME

MUIA_Dtpic_Alpha -- V20 [ISG], LONG, 0x8042b4db

FUNCTION

Specify an additional alpha value to be applied when blitting the loaded image onto the screen. The value of MUIA_Dtpic_Alpha is an 8bit value specifying the intensity of the alpha blitting. You usually want to specify 0xff. Alpha blitting won't work on CLUT (i.e. depth <= 8 bit) screens.

MUIA_Dtpic_DarkenSelState

NAME

MUIA_Dtpic_DarkenSelState -- V20 [I.G], BOOL, 0x80423247

FUNCTION

If set to TRUE the image's brightness will decreased by 50% whenever the left mouse button is pressed on the object.

SEE ALSO

MUIA_Dtpic_LightenOnMouse

MUIA_Dtpic_Fade

NAME

MUIA_Dtpic_Fade -- V20 [ISG], LONG, 0x80420429

FUNCTION

Setting this attribute to a positive value while also changing the image's alpha value will let Dtpic class do a fade between the previous and the new alpha value. This allows images to be faded in our out. Depending on the fading direction between the current and the final alpha value the specified value will be repeatedly added or subtracted respectively to the current alpha value with a delay of 20ms until the final alpha value has been reached.

For negative values the fading process will be stopped and the final alpha value will be set immediately.

EXAMPLE

// fade out the image within approx. half a second
SetAttrs(obj,
  MUIA_Dtpic_Fade, 255/20,
  MUIA_Dtpic_Alpha, 0x00,
  TAG_DONE);

SEE ALSO

MUIA_Dtpic_Alpha

MUIA_Dtpic_LightenOnMouse

NAME

MUIA_Dtpic_LightenOnMouse -- V20 [I.G], BOOL, 0x8042966a

FUNCTION

If set to TRUE the image's brightness will increased by 20% whenever the mouse is moved over the object.

SEE ALSO

MUIA_Dtpic_DarkenSelState

MUIA_Dtpic_Name

NAME

MUIA_Dtpic_Name -- V18 [ISG], STRPTR, 0x80423d72

FUNCTION

Specify the name of the image file to be loaded using datatypes.library. This attribute is absolutely required.

Dtpic class will remember the passed string pointer during OM_NEW and OM_SET, but the string will NOT be copied. Thus the pointer must stay valid as long as the object lives. To change the image later you MUST use a different string buffer as Dtpic class will refuse to accept the old string buffer a second time. Finally, NULL is NO valid value for this attribute.

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