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1/*
2 * Copyright (c) 2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16import router from '@ohos.router';
17
18@Entry
19@Component
20struct GradientExample {
21  private settings: RenderingContextSettings = new RenderingContextSettings(true)
22  private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings)
23
24  build() {
25    Column() {
26      Canvas(this.context)
27        .width(600)
28        .height('40%')
29        .backgroundColor('#00ffff')
30      Row() {
31        Button('createRadialGradient').width(130).height(45)
32	  .key('createRadialGradient')
33          .onClick(() => {
34            var grad = this.context.createRadialGradient(130, 130, 30, 130, 130, 60)
35            grad.addColorStop(0.0, 'red');
36            grad.addColorStop(0.5, 'white');
37            grad.addColorStop(1.0, 'green');
38            this.context.fillStyle = grad;
39            this.context.fillRect(50, 30, 150, 200);
40          })
41        Button('createLinearGradient').width(130).height(45)
42	  .key('createLinearGradient')
43          .onClick(() => {
44            var grad = this.context.createLinearGradient(150, 0, 250, 300)
45            grad.addColorStop(0.0, 'red');
46            grad.addColorStop(0.5, 'white');
47            grad.addColorStop(1.0, 'green');
48            this.context.fillStyle = grad;
49            this.context.fillRect(250, 30, 150, 200);
50          })
51      }.margin({ top: 20 })
52      .width('100%')
53      .justifyContent(FlexAlign.SpaceAround)
54
55      Button('back')
56        .width(130)
57        .height(45)
58        .key('back')
59        .backgroundColor(Color.Orange)
60        .onClick(() => {
61          router.back()
62        })
63        .margin({ top: 10 })
64    }
65    .width('100%')
66    .height('100%')
67    .alignItems(HorizontalAlign.Center)
68    .justifyContent(FlexAlign.Center)
69  }
70}