gbSpriteDemo provides a demonstration of displaying, move, resizing and rotating sprite images. Multiple image file formats (bmp/png/gif/jpg) are supported. The capability is provided by a single function which may be easily dropped into other PowerBASIC applicatons.

gbSpriteDemo makes use of two Win32 API, PlgBlt and TransparentBlt. These API allow rotation and the designation of a specific transparency color.

The technique demonstarted by gbSpriteDemo is

gbSpriteDemo is NOT a sprite engine. The technique of generating, animating, and controlling many sprites is very different than the approach used in gbSpriteDemo. Also, gbSpriteDemo does not use/require the alpha channel found in some file formats.

Download (v1.0, 295KB)

To install, just unzip the contents of the distribution file into a folder of its own!

gbSpriteDemo uses a single window, consisting of a toolbar and a graphic control which displays the track and rider.

Feature List

• Select sprite (any user image)
• Multiple file formats - bmp/gif/jpg/png
• Display one or more sprites
• Place center of sprite at cursor
• Place upper left corner of sprite at cursor
• Set sprite zoom factor
• Drag last sprite to new location
• Use MouseWheel to rotate sprite
• Use MouseWheel to set rotation angle for next sprite
• Display center, image, and rotation outlines
• Select transparency color
• Remove all sprites
• Remove all but last sprite
• Set display background color
• Save display image betwen sessions
• Online Help

You can put as many icons on the screen as you want ...

And you apply a zoom factor to each sprite ...

And you can show the center, image, and rotation boundaries of a sprite as well ...

Toolbar

• Select - Select a sprite to display
• Clear - Clear all sprites
• Last Only - Clear all but the last sprite
• Sprite - Reset the last sprite to zero rotation
• Theta - Change the rotation angle (for the next sprite) to zero
• Zoom - Set sprite zoom factor (25% to 400%)
• T-Color - Set transparency color
• BGColor - Set display background color
• Outlines - Display sprite center, image and rotation outlines
• Centered - When displaying sprites, center sprite at cursor
• AutoClear - When a sprite is displayed, all other sprites are removed
• Help - Open this online Help page

Keyboard Shortcuts

• F1 - Help
• Ctrl+A - Clear all previous sprites when a new sprite is drawn
• Ctrl+B - Set background color
• Ctrl+H - Local Help
• Ctrl+N - Clear all sprites
• Ctrl+O - Open dialog to select sprite
• Ctrl+S - Display sprite outlines
• Ctrl+T - Set transparency color
• Ctrl+Z - Set last sprite rotation angle to zero

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