SaintsDraw

SaintsDraw allow you to draw arrow, circle, and arc in Unity, using Gizmos or LineRenderer

Developed by: TylerTemp, 墨瞳

Unity: 2019.1 or above

Installation

• Using OpenUPM

  openupm add today.comes.saintsdraw
  

• Using git upm:

  add this line to manifest.json in your project

  {
      "dependencies": {
          "today.comes.saintsdraw": "https://github.com/TylerTemp/SaintsDraw.git",
          // your other dependencies...
      }
  }
  

• Using a unitypackage:

  Go to the Release Page to download a desired version of unitypackage and import it to your project

• Using a git submodule:

  git submodule add https://github.com/TylerTemp/SaintsDraw.git Assets/SaintsDraw
  

Change Log

1.0.4

Make the arrow drawing helper public

See the full change log.

Draw

Arrow

Using Arrow.Draw to draw an arrow, which has parameters:

• Vector3 from point where the arrow starts (tail)
• Vector3 to points where the arrow ends (head)
• float arrowHeadLength = 0.5f
• float arrowHeadAngle = 20.0f
• Vector3? up = null up direction of the arrow, default is Vector3.up. This is useful when you have some rotation on the arrow. The arrow is always perpendicular to this up direction.

Append a LineRenderer as the first parameter to draw the arrow using LineRenderer

using SaintsDraw;
Arrow.Draw(Vector3.zero, Vector3.one);

Circle (Disk)

Using Circle.Draw to draw an circle (disk), which has parameters:

• Vector3 center center of the circle
• float radius radius of the circle
• Vector3 upward up direction of the circle. The circle is always perpendicular to this value. Usually Vector3.up is used
• int numSegments how many segments to draw for the arc. The bigger it is, the smoother the arc is

Using Circle.DrawBySegCount to draw an circle with fixed segment steps, which means each segment will have the same angle. It has the same parameters as Circle.Draw except int numSegments is replaced by float segAngle.

Append a LineRenderer as the first parameter to draw the arc using LineRenderer

using SaintsDraw;
Circle.Draw(Vector3.zero, 5f, Vector3.up, 40);

Arc

Using Arc.Draw to draw an arc, which has parameters:

• Vector3 center center of the arc

• float radius radius of the arc

• float fromArc angle to start

• float toArc angle to end

• Vector3 upward up direction of the arc. The arc is always perpendicular to this value. Usually Vector3.up is used

• Vector3 plate as the arc no has a plate which is perpendicular to the arc, this parameter is used to determine the plate's start point. It'll be automatically put on the plate defined by the upward direction.

  Usually Vector3.left or Vector3.forward is used

• int numSegments how many segments to draw for the arc. The bigger it is, the smoother the arc is

Using Arc.DrawBySegCount to draw an with fixed segment steps, which means each segment will have the same angle. It has the same parameters as Arc.Draw except int numSegments is replaced by float segAngle.

Append a LineRenderer as the first parameter to draw the arc using LineRenderer

using SaintsDraw;
Arc.Draw(Vector3.zero, 5f, 60f, 120f, Vector3.up, Vector3.left, 40);

DrawWireRectTransform

UIGizmos.DrawWireRectTransform(RectTransform rectTransform, Camera camera=null, float distance=5f)

Draw a wireframe of a RectTransform in the scene view. This works even the RectTransform has rotation and scale.

Parameters:

• RectTransform rectTransform the RectTransform to draw
• Camera camera the camera of the canvas. null for Overlay type.
• float distance the distance from the camera to the wireframe. This only works if you pass the camera parameter which is the target camera of the canvas, and ensure your rectTransform is under this canvas too.

UIGizmos.DrawWireRectTransform(GetComponent<RectTransform>());

Some Tools

Gizmos Color

using (new ColorScoop(Color.green))
{
    Arrow.Draw(Vector2.zero, Vector2.up);
}

Gizmos Matrix

Useful if you want to draw gizmos in local space inheriting parent's scale and rotation

using (new MatrixScoop(transform.localToWorldMatrix))
{
    Arrow.Draw(Vector2.zero, Vector2.up);
}

Arc Tools

this will normalized your angle, which allow over 360 but will has no overlap

(float normFromArc, float normToArc) = Arc.NormalAngleRange(_fromArc, _toArc);

this will display an arrow from arc center to the angle you want to check, helpful when testing upward and plate

Vector3 startPos = Arc.GetDirection(_upward, _plate, angle).normalized * _arcRadis;
Arrow.Draw(Vector3.zero, startPos);