// Rectangle draws a rectangle using a path between (x1,y1) and (x2,y2) func Rectangle(path draw2d.PathBuilder, x1, y1, x2, y2 float64) { path.MoveTo(x1, y1) path.LineTo(x2, y1) path.LineTo(x2, y2) path.LineTo(x1, y2) path.Close() }
// RoundedRectangle draws a rectangle using a path between (x1,y1) and (x2,y2) func RoundedRectangle(path draw2d.PathBuilder, x1, y1, x2, y2, arcWidth, arcHeight float64) { arcWidth = arcWidth / 2 arcHeight = arcHeight / 2 path.MoveTo(x1, y1+arcHeight) path.QuadCurveTo(x1, y1, x1+arcWidth, y1) path.LineTo(x2-arcWidth, y1) path.QuadCurveTo(x2, y1, x2, y1+arcHeight) path.LineTo(x2, y2-arcHeight) path.QuadCurveTo(x2, y2, x2-arcWidth, y2) path.LineTo(x1+arcWidth, y2) path.QuadCurveTo(x1, y2, x1, y2-arcHeight) path.Close() }
// Circle draws a circle using a path with center (cx,cy) and radius func Circle(path draw2d.PathBuilder, cx, cy, radius float64) { path.ArcTo(cx, cy, radius, radius, 0, -math.Pi*2) path.Close() }
// Ellipse draws an ellipse using a path with center (cx,cy) and radius (rx,ry) func Ellipse(path draw2d.PathBuilder, cx, cy, rx, ry float64) { path.ArcTo(cx, cy, rx, ry, 0, -math.Pi*2) path.Close() }