Title:
Queens_ImageControl_VS2005
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Description: I recently wrote an article showing a simple method for panning an image. The code worked very well for small to moderate sized images. However, when using very large images, the performance degraded significantly.
That article used a picture box within a panel, and used the auto scroll functionality of the panel to perform scrolling. I received quite a bit of feedback indicating the need for a version that could handle very large images and still pan very smoothly. I also received requests for ideas on how to zoom the image in and out. So, I got to work.
What I came up with is a control that could smoothly pan super-sized images, and also provided zoom functionality. My tests were with a 49MB GIF (7000 x 7000). The performance was very smooth. Of course, the control works equally as well with small images. The control is demonstrated in the included sample project.
This custom control does not use a picture box, nor does it inherit from one. Neither is there a panel or any "a
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File list (Check if you may need any files):
Queens_ImageControl_VS2005\Queens_ImageControl.sln
..........................\Queens_ImageControl.suo
..........................\Queens_ImageControl
..........................\...................\bin
..........................\...................\...\Debug
..........................\...................\...\.....\Queens_ImageControl.dll
..........................\...................\...\.....\Queens_ImageControl.xml
..........................\...................\DrawingBoard.Designer.vb
..........................\...................\DrawingBoard.resx
..........................\...................\DrawingBoard.vb
..........................\...................\ImageControl.Designer.vb
..........................\...................\ImageControl.resx
..........................\...................\ImageControl.vb
..........................\...................\My Project
..........................\...................\..........\Application.Designer.vb
..........................\...................\..........\Application.myapp
..........................\...................\..........\AssemblyInfo.vb
..........................\...................\..........\Resources.Designer.vb
..........................\...................\..........\Resources.resx
..........................\...................\..........\Settings.Designer.vb
..........................\...................\..........\Settings.settings
..........................\...................\Queens_ImageControl.vbproj
..........................\...................\Queens_ImageControl.vbproj.user
..........................\Test Harness
..........................\............\bin
..........................\............\...\Debug
..........................\............\...\.....\Queens_ImageControl.dll
..........................\............\...\.....\Queens_ImageControl.xml
..........................\............\...\.....\Test Harness.exe
..........................\............\...\.....\Test Harness.xml
..........................\............\Form1.Designer.vb
..........................\............\Form1.resx
..........................\............\Form1.vb
..........................\............\My Project
..........................\............\..........\Application.Designer.vb
..........................\............\..........\Application.myapp
..........................\............\..........\AssemblyInfo.vb
..........................\............\..........\Resources.Designer.vb
..........................\............\..........\Resources.resx
..........................\............\..........\Settings.Designer.vb
..........................\............\..........\Settings.settings
..........................\............\Resources
..........................\............\Test Harness.vbproj
..........................\............\Test Harness.vbproj.user
