LBitmap::Tunnel
#include "ltwrappr.h"
virtual L_INT LBitmap::Tunnel( ptCenterPoint, uZValue, nDistance, uRad, nRepeat, nRotationOffset, uStretch, uStartBright, uEndBright, uBrightLength, crBright, crFill, uFlags)
POINT ptCenterPoint; |
/* point at which the viewer is looking */ |
L_UINT uZValue; |
/* viewing screen offset on the Z-axis */ |
L_INT nDistance; |
/* camera distance from the viewing screen */ |
L_UINT uRad; |
/* tunnel radius */ |
L_INT nRepeat; |
/* number of times the bitmaps are repeated */ |
L_INT nRotationOffset; |
/* rotation offset */ |
L_UINT uStretch; |
/* compression factor */ |
L_UINT uStartBright; |
/* brightness of an external light source on the first bitmap displayed */ |
L_UINT uEndBright; |
/* brightness of an external light source on the last bitmap displayed */ |
L_UINT uBrightLength; |
/* changes in brightness along the Z axis */ |
COLORREF crBright; |
/* color of an external light source that is shined on the bitmaps */ |
COLORREF crFill; |
/* background color */ |
L_UINT uFlags; |
/* flags */ |
Places the bitmap inside a tunnel along the Z-axis. This function is available in the Raster Pro and above toolkits.
Parameter |
Description |
|
ptCenterPoint |
POINT structure that contains the point at which the camera or viewer is looking. It may be outside the bitmap borders. |
|
uZValue |
Viewing screen offset on the Z-axis, in pixels. |
|
nDistance |
Camera distance from the viewing screen, in pixels. |
|
uRad |
Tunnel radius. |
|
nRepeat |
Number of times the bitmap repeats along the Z-axis. If nRepeat equals –1 the bitmap will be infinitely repeated. Its range starts from –1. |
|
nRotationOffset |
Rotates tunnel around the Z-axis in pixel steps. If TUN_AXIS_WIDTH option is selected then the bitmap width is along the Z-axis and nRotationOffset set to the bitmap height is equivalent to a complete cycle. If TUN_AXIS_HEIGHT option is set, then the bitmap height is along the Z-axis and nRotationOffset set to the bitmap width is equivalent to a complete cycle. |
|
uStretch |
Value that indicates whether to expand or compress the bitmap, and by how much. If uStretch < 100 bitmap will be expanded. If uStretch > 100 the bitmap will be compressed. Use 100 to maintain the bitmap's dimensions. The value of this parameter is internally divided by 100. |
|
uStartBright |
Value that indicates the brightness of an external light source at the beginning of the tunnel. Possible values range from 0 to 100. A value of 0 indicates no external light is displayed at the beginning of the tunnel. A value of 100 indicates an external light source with full brightness is displayed. |
|
uEndBright |
Value that indicates the brightness of an external light source at the end of the tunnel. Possible values range from 0 to 100. A value of 0 indicates no external light displayed at the end of the tunnel. A value of 100 indicates an external light source with full brightness is displayed on the bitmap. |
|
uBrightLength |
Value that indicates how much the brightness changes as you move along the Z axis. This parameter is internally multiplied by 50. |
|
crBright |
The COLORREF value that specifies the color of an external light source that shines in the tunnel. |
|
crFill |
The COLORREF value that specifies the background color. |
|
uFlags |
Flags that indicate the background color and which bitmap dimension extends along the Z-axis. You can use a bit wise OR (|) to specify one flag from each group. |
|
|
The following are the flags that indicate the background color: |
|
|
Value |
Meaning |
|
PLANE_FILL_CLR |
[0x0001] Use the crFill as a background color. |
|
PLANE_NO_CHG |
[0x0002] Use the image itself as a background. |
|
The following are the flags that indicate which bitmap dimension is along the Z-axis: |
|
|
Value |
Meaning |
|
TUN_AXIS_WIDTH |
[0x0010] Bitmap width will be along the Z-axis. |
|
TUN_AXIS_HEIGHT |
[0x0010] Bitmap height will be along the Z-axis. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
This function shows the effect of placing a bitmap inside a tunnel along the Z-axis. An external light source of the specified color and brightness may be shined on the bitmaps. The brightness may vary along the z-axis according to the uBrightLength value.
Changing the camera center point, the rotation angle and the viewing screen Z-offset will simulate moving along the axis.
If the bitmap has a region, the effect will be applied on the region dimensions only.
This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
To update a status bar or detect a user interrupt during execution of this function, refer to LBase::EnableStatusCallback.
For an example, see the following figure:
The following figure shows the same bitmap, after the effect has been applied:
To obtain this effect, the following settings were used with the function:
CenterPoint(x,y) = (200,200)
uZValue= 0
nDistance= 200
uRad= 200
nRepeat= -1
nRotationOffset= 75
uStretch= 25
uStartBright= 0
uEndBright= 100
uBrightLength= 45
crBright= RGB(255,255,255)
crFill= RGB(255,255,255)
uFlags= PLANE_FILL_CLR|TUN_AXIS_WIDTH
This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.
Required DLLs and Libraries
LTIMG For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
Example
void TestFunction(LAnimationWindow *BitmapWindow)
{
POINT CenterPt;
CenterPt.x = BitmapWindow->GetWidth()/2;
CenterPt.y = BitmapWindow->GetHeight()/2;
BitmapWindow->Tunnel(CenterPt, 0, BitmapWindow->GetHeight(), BitmapWindow->GetWidth()/2, -1,0, 25,100,0, 2000, RGB(255,0,0), RGB(0,0,0),TUN_AXIS_WIDTH | PLANE_FILL_CLR);
}