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What determines the center of a footprint?

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IBNobody 8 years ago

I have two similar footprints, both with a center hole at 0,0 on the PCB lib editor. On one, the center hole is treated as the component center. On another, another non-centered pad is treated as the component center. Is it something to do with how the component parts appear in the EasyEDA text-based model?

Comments

support 8 years ago

Any images to help us to find the diffirence? Thanks

IBNobody 8 years ago

Actually, I figured it out. The centerpoint is picked when the component is placed based on the snap. If I have a large snap (375mil), the placement centerpoint cannot be predicted. If I choose a smaller snap, the origin of the component is used as a centerpoint.

IBNobody 8 years ago

Yes, I can confirm that this is the behavior I am seeing. The only way I can consistently get an accurate centerpoint is by reducing the grid to 1 and then dropping the component onto the PCB.

dillon 8 years ago

We try to make the pads on the grid when drag. If the set the grid to small, it is easy to center .

IBNobody 8 years ago

@dillon I see now. That makes sense, even though it is not intuitive. For large components that are not square, you would want to snap to the pad to make routing easier. I agree with this decision. But which pad is chosen to be aligned? If I put a dummy pad in the center of my hole at 0,0, would that trick the system into making the center hole the placement point? Maybe there needs to be a feature to set the local origin of a component once placed?

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