PShape does not provide getters for rectMode / ellipseMode

从 PShape 类开始，检查受保护的 ellipseMode 和 rectMode 字段以及其现有的公共 API。添加一种让调用方能够查询这两种模式的方式，然后验证基本图形转换代码能够区分每种模式下参数的含义。

Most relevant area for this enhancement?

Core/Environment/Rendering

Feature to enhance

The PShape class

Enhancement details

Enhancement description

I was half way developing some classes to convert between PShapes and OPENRNDR Shapes but got stuck.

When dealing with PShape.PRIMITIVE types, PShape.getKind() returns what kind of shape is it (rect, ellipse, ...) and the PShape.getParams() returns an array of float values (x, y, width...) One needs to know the kind to know what the float values mean. But it's not sufficient, because if one called ellipseMode before, the values may mean center x and y, or corner x and y, either width or radius.

I didn't find a way to query ellipseMode or rectMode.

Benefits

Adding a way to query this information would help cross framework use of the PShape data structures.

Challenges

I think adding two getters to PShape shouldn't have any negative impact, but I'm not very familiar with the code base to be sure.

Additional context

Here a wip function where I try to convert an ELLIPSE PShape to an OPENRNDR Shape. This is incomplete, because the meaning of params 0, 1, 2 and 3 depend on the ellipseMode used, and there's no way to figure this out (I think).

        PShape.PRIMITIVE -> {
            listOf( // 101
                when (kind) {
                    PShape.RECT -> Rectangle( // 30
                        params[0] * 1.0, params[1] * 1.0,
                        params[2] * 1.0, params[3] * 1.0
                    ).contour

                    PShape.ELLIPSE -> Ellipse( // 31
                        params[0] * 1.0, params[1] * 1.0,
                        params[2] * 0.5, params[3] * 0.5
                    ).contour

                    PShape.LINE -> LineSegment(
                        params[0] * 1.0, params[1] * 1.0,
                        params[2] * 1.0, params[3] * 1.0
                    ).contour

                    // ARC, TRIANGLE, QUAD, SPHERE, BOX
                    else -> error("unsupported primitive kind: $kind")
                }
            )

PShape holds ellipseMode and rectMode variables, but they are protected and without getters.

Would you like to help implement this enhancement?

I’m not sure yet