1 /*
<lambda>null2  * Copyright 2017 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *     https://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package traceviewer.ui
18 
19 import java.awt.event.ActionListener
20 import javax.swing.Timer
21 
22 class RenderState(minX: Double, maxX: Double, viewWidth: Int) {
23     var scale: Double
24         private set
25     var panX: Double
26         private set
27 
28     val listeners = mutableListOf<() -> Unit>()
29 
30     init {
31         panX = minX
32         scale = viewWidth / (maxX - minX)
33     }
34 
35     private fun notifyListeners() {
36         listeners.forEach { it() }
37     }
38 
39     fun xViewToWorld(x: Int) = (x / scale) + panX
40 
41     fun zoomBy(amount: Double, viewX: Int) {
42         val worldX = xViewToWorld(viewX)
43         val endScale = scale * amount
44         animate(scale, endScale) {
45             scale = it
46             panX = worldX - (viewX / scale)
47             notifyListeners()
48         }
49     }
50 
51     fun pan(deltaX: Int) {
52         val endPanX = panX + (deltaX / scale)
53         animate(panX, endPanX) { value ->
54             panX = value
55             notifyListeners()
56         }
57     }
58 }