📘

Source code

Please see the UgBitmapDemo project for the source code created in this chapter. See Installing examples for information on how to download the examples. The URL is here for direct access is https://github.com/scadedoc/UgExamples/tree/master/UgSqlLiteSwift

Introduction

Using the bitmap control, you can display images sourced from within the app or dynamically downloaded from the internet.

As with all of our controls, the controls represent a wrapper around the native controls and expose a subset of its functionality to user:

• We support the following formats : PNG, SVG, JPG
• We support SVG based scaling of the bitmap

Control attributes

Static image references

In order to put an image stored on the app, please put the image/bitmap into the Assets folder (or a subfolder). You can then use the image control to add a new image to your app:

Scade mode and alignment

The scale mode describes how the bitmap fits into the current area. You can combine the scale mode and the alignment for best fit.

• Scale mode: none, Fit into Parent (Meet), Fill Parent (slice)
• Alignment (9 different positions)

📘

Scaling Factor Articles

These articles explain scaling factor in detail. In case its needed

• http://unmatchedstyle.com/news/svg-and-the-preserveaspectratio-property.php
• https://sarasoueidan.com/demos/interactive-svg-coordinate-system/#CheatSheet

Setting bitmaps using code

You always have to make TWO settings

• make sure you specify the path in the url field correctly. It's /<image.png|jpg|svg>
• make sure you set the isContentPriority to false

import ScadeKit
  
class BindingAndScalePagePageAdapter: SCDLatticePageAdapter {
  
  // page adapter initialization
  override func load(_ path: String) {
    super.load(path)
    
    self.image1.url = "Assets/dog2.jpg"
    self.image1.contentPriority = false
    
    self.main.onClick.append(SCDWidgetsEventHandler{_ in self.navigation!.go(page: "main.page")})
  }
}

Setting images using raw data from download

To use images that don't exist on the app yet, we use the SCDNetworkRequest and SCDNetworkResponse objects to download the data:

• set the content field with the raw image data received from the network call
• make sure you set the isContentPriority to true

import ScadeKit

class MainPageAdapter: SCDLatticePageAdapter {
    
    // page adapter initialization
    override func load(_ path: String) {        
        super.load(path)
        
        // adding 2nd page btn 
        self.itmBinding.onClick{_ in self.navigation!.go(page: "BindingAndScalePage.page")}
        
        
        // get reference to second bitmap and set bitmap
        self.image2.url = "Assets/dog2.jpg"
        self.image2.contentPriority = false
        
        let externalurl = "https://s3.amazonaws.com/scade.io/demo/documentation/dog3.jpg"
        let request = SCDNetworkRequest()
        request.url = externalurl
        if let response = request.call() {
            self.image3.content = response.body
            self.image3.contentPriority = true
        }
        
    }
}