public static UICircleVO Arc(this UICanvas canvas, Vector2 center, float radius, bool stroke, Color32 strokeColor, float thickness, bool fill, Color32 fillColor, float fillStart = 0, float fillAmount = 100, int segments = 360)
{
var vo = new UICircleVO();
vo.center = center;
vo.radius = radius;
vo.fillAmount = fillAmount;
vo.fill = fill;
vo.fillColor = fillColor;
vo.stroke = stroke;
vo.color = strokeColor;
vo.thickness = thickness;
vo.segments = segments;
vo.fillStart = fillStart;
canvas.DrawingGraphics.Add(vo);
return(vo);
}
public static void DrawCircle(this UICanvas canvas, List <UIVertex> vertices, List <int> indices, UICircleVO circle)
{
float f = (circle.fillAmount / 100f);
float fs = (circle.fillStart / 100f);
float degrees = 360f / circle.segments;
float fa = (circle.segments) * f;
float start = (circle.segments) * fs;
List <Vector2> allV = new List <Vector2>();
float i = start * degrees;
float end = (fa + start) * degrees;
while (i <= end)
{
float rad = Mathf.Deg2Rad * i;
float c = Mathf.Cos(rad);
float s = Mathf.Sin(rad);
Vector2 p0 = new Vector2(circle.center.x + circle.radius * c, circle.center.y + circle.radius * s); // 外边框 顶点0
allV.Add(p0);
if (i == end)
{
break;
}
i = Mathf.Min(i + degrees, end);
}
List <Vector2> polygonVertices = allV.ToArray().ToList();
if (circle.fillAmount < 100)
{
polygonVertices.Add(circle.center);
}
else
{
polygonVertices = polygonVertices.GetRange(0, polygonVertices.Count - 1);
}
if (circle.fill)
{
canvas.FillPolygon(vertices, indices, polygonVertices, circle.fillColor);
}
if (circle.stroke)
{
canvas.StrokePolygon(vertices, indices, allV, circle.thickness, circle.color);
}
}