-
-
Notifications
You must be signed in to change notification settings - Fork 72
/
Renderer.scala
40 lines (35 loc) · 1.28 KB
/
Renderer.scala
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/*
* Copyright 2015 Creative Scala
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package doodle
package effect
import cats.effect.IO
import doodle.algebra.Algebra
import doodle.algebra.Picture
/** The `Renderer` typeclass describes a data type that can create an area to
* render a picture (a Canvas) from a description (a Frame) and render a
* picture to that Canvas.
*/
trait Renderer[+Alg <: Algebra, Frame, Canvas] {
/** Construct a Canvas from a description. */
def canvas(description: Frame): IO[Canvas]
/** Render a picture to a Canvas. */
def render[A](canvas: Canvas)(picture: Picture[Alg, A]): IO[A]
}
object Renderer {
def apply[Alg <: Algebra, Frame, Canvas](implicit
renderer: Renderer[Alg, Frame, Canvas]
): Renderer[Alg, Frame, Canvas] = renderer
}