CODEWITHSUNDEEP
copengl
user2099155
user2099155

Reputation: 25

OpenGL: How to drag image and move it to the line by using the mouse

I want to drag an image to one line by using the mouse and when the image is close to the line, the image will automatically move on to the line, like some "floor planner" program ------------you create wall and drag the door to this wall and when the door is close to the wall, the door will automatically show up on the wall.

Can OpenGL do it?

if it can, can anyone tell me how? If it can not, can anyone tell me how I can do it?
Show me an example.

Upvotes: 0

Views: 344

Answers (1)

unwind
unwind

Reputation: 399703

OpenGL is a rendering API, it's purpose is to generate rasterized images based on descriptions provided to it by an application.

It knows nothing about user input, and even less about the application's "domain objects" such as doors, walls, and so on. All it deals with is abstract coordinates and matrices that describe the transforms and projections to take those 3D coordinates into 2D for rasterization, as well as shading for surfaces and so on.

So, it's up to you to implement that, so that the coordinates you eventually pass to OpenGL end up being what you want them to be.

Snapping is typically a combination of measuring the distance to some guiding object, and the following quantization of the input coordinates to correspond to the the guide.

Upvotes: 5

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