DrawRectProjected and DrawRectFilledProjected

[Former user]

This is a feature request. Would you be willing to implement DrawRectProjected and DrawRectFilledProjected? I suspect it is not only possible but pretty straightforward considering there is already projected versions for circles and lines.

This is for https://github.com/snakelayer/gw2-raid-assist

Thanks for considering!

[Snake Layer]

More specifically, it would take the same parameters as the existing DrawRect* methods, but with an additional rotation input.

[hairys]

I'm probably not the best person to ask, haha. I'm, by no means, a DirectX expert. If you, or anyone else, can copy the DrawCircleProjected and make the necessary adjustments, I suggest you submit a PR.

[rafzi]

No time time implement and test, but this should help:

You would first create a vertexbuffer like vbCircle in EspDraw.cpp:InitEsp() with 5 verticies resembling a quare on the xy plane with edge length 1. It should go around once with the last vertex equal to the first. This way the impementations for non-filled and filled can be made with linestrip and trianglefan like in the circle functions. The clockwise order should not matter, because vertex culling is disabled I believe.

Then add the proper API functions and add rotation capabilities with these as needed: D3DXMatrixRotationAxis D3DXMatrixRotationQuaternion D3DXMatrixRotationX D3DXMatrixRotationY D3DXMatrixRotationYawPitchRoll D3DXMatrixRotationZ

To make rectangles you just provide D3DXMAtrixScaling with two different values for x and y scaling.

[hairys]

Here's what I have so far:

[hairys]

Apparently, ctrl+enter posts a comment...

void GW2LIB::DrawRectFilledProjected(Vector3 pos, float x, float y, float rot, DWORD color)
{
    const auto pDrawer = GetMain()->GetDrawer(true);
    if (pDrawer) {
        D3DXMATRIX scale, translate, rotation;
        D3DXMatrixScaling(&scale, x, y, 1);
        D3DXMatrixTranslation(&translate, pos.x, pos.y, pos.z);
        pDrawer->DrawPrimitive(vbRect, nullptr, D3DPT_TRIANGLEFAN, scale*translate, color);
    }
}

rot would be the rotation angle from ag->GetRot();

here's the VertexBuffer:

    std::vector<hl::VERTEX_3D_COL> rectVerts = {
        {-1, -1, 0},
        {1, -1, 0},
        {1, 1, 0},
        {-1, 1, 0},
        {-1, -1, 0}
    };

This all works as expected, except for rotation on the origin. Not sure what to do there.

[rafzi]

This depends on how much customization is required for rotation.

A simple one would be:

D3DXMatrixRotationZ(&rotation, angle);

The order of matrix multiplications should be:

scale*rotation*translate

D3DX does matrix multiplication with inverted operators to normal mathematical notation. Means you can apply transformations sequentially: "First scale, then rotate, then translate".

[hairys]

Ah, didn't realize order was important. That was it, thanks rafzi.

[hairys]

@@snakelayer wish granted: 900d2d1

[Snake Layer]

Thank you!