放大和缩小角度对ngx-image-cropper不起作用

Question

我正在尝试从ngx图像裁剪放大和缩小。我没有得到任何错误，但当我点击按钮zoomOut或ZoomIn它不工作。

我在这里做错了什么？

我的TS代码

  zoomOut() {
    this.scale -= .1;
    this.transform = {
        ...this.transform,
        scale: this.scale
    };
}

zoomIn() {
    this.scale += .1;
    this.transform = {
        ...this.transform,
        scale: this.scale
    };
}

我的HTML代码

       <button class="btn zoomIn" (click)="zoomIn()" tooltip="Zoom In" data-toggle="tooltip" data-placement="top" title="Zoom In"></button>
       <button class="btn zoomOut" (click)="zoomOut()" tooltip="Zoom Out" data-toggle="tooltip" data-placement="top" title="Zoom Out"></button>

Answer 1

它类似于这个another SO。实际上角度总是一样的，把.ts (模型)和.html (视图)中的变量联系起来。嗯，在文档中，about binding是非常差的。就我个人而言，我讨厌示例{{variable}} :)

您可以声明一个变量scale

scale:number=1;

<!--see that you can use the .html to makes "simple code"
     (equal a variable to another an so on)
-->
<button class="btn zoomIn" (click)="scale=scale+.1"></button>
<button class="btn zoomIn" (click)="scale=scale-.1"></button>

<img [style.transform]="'scale('+scale+')'" ...>

Answer 2

​

export class AppComponent {  
  zoom:boolean=false;
  zoomOut(){
    this.zoom=false;
  }
  zoomIn(){
    
    this.zoom=true;
  }
  getheight(){
    if(this.zoom==true){
      return '500px';
      //return your desiderd value in pixel or in percentage
    }
    else{
      return '200px';
      }
  }

}

button{
    padding: 8px;
}
#test-zoom{
    height: 500px;
    width: 100%;
    position: relative;
    background: red;
}
.zoom-card{
    height: 500px;
    width: 90%;
    position: relative;
    margin: auto;
    background: lime;
}

.test-image{
    width: auto;
}

<section id="test-zoom">
  <div class="zoom-card">
    <img [ngStyle]="{'height':getheight()}" width="auto" class="test-image" src="https://www.netcetra.com/images/howto_images/photoshop-logo.jpg">
    <br>
    <button (click)="zoomIn()" >Zoom In</button>
    <button (click)="zoomOut()" >Zoom Out</button>

  </div>
</section>

​

使用此代码并将其粘贴到app.component.ts、CSS和HTML文件中。