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MouseMove.scala
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MouseMove.scala
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/*
* 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 interact
package algebra
import cats.effect.IO
import doodle.core.Point
import fs2.Stream
/** Algebra for generating a stream of events giving the current mouse location.
* Whenever the mouse moves a new event is generated. The algebra applies to a
* Renderer's Canvas data type instead of the F data type, and hence gives the
* mouse location in the canvas rather than relative to any Picture rendered on
* the canvas.
*/
trait MouseMove[Canvas] {
/** Return a stream that has an event every time the mouse moves across the
* canvas. The coordinate system used is the global coordinate system used by
* the Canvas, which usually means the origin is centered on the canvas.
*/
def mouseMove(canvas: Canvas): Stream[IO, Point]
}