Rather than have to figure out which hand you are dragging on, I just used two different buttons of the mouse. Since the hands are mostly black on a white background, we can just bitblt that onto the clock face with a srcAnd Raster OP without needing a mask to support transparency. I just loaded up a clock face as the backgorund image, and an hour hand and minute hand to be drawn from the pictureboxes up top.
#Drawit xamarin code
I added code to determine angle of the mouse and setup the matrix and draw accordingly.
Second attachment, I copied the previous example to a new directory, removed a bunch of the code. To create the dynamically transparent rotating image, drag the mouse in the pictureboxes at the top of the form. It also draws a grid of lines using regular VB6 drawing commands to show that the regular VB6 drawing is also subject to the rotation matrix currently in effect. It sets up the matrix and constantly rotates and bitblts a pair of picturebox images to do a transparent drawing overlay on a picturebox with an image in the background. I'll attach the original example code, which is interesting in its own right. Net).īut I did have an example I did a while ago on another forum that used the GDI rotation, so I thought that could be modified to give you clock hand dragging capability without too much work.
Good old GDI also supported a rotation matrix to transform drawing, but it is not as easy as GDI+ (at least in. Most recently LaVolpe has a codebank submission that you may want to take a look at. I haven't done GDI+ in VB6, although I know of a few people who have. Dragging on and rotating the hands would be easier in VB.Net because of the use of GDI+.
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