I need a square block of 20% of the screen,
If i get a width of 100 DP then i also need height of 100 DP.
How to achieve this in android with the use of weight?
You can do like this
public void setImageSize(byte[] imageThumbnail)
{
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
Bitmap bitmapOrg = new BitmapDrawable(getResources(), new ByteArrayInputStream(imageThumbnail)).getBitmap();
int width = bitmapOrg.getWidth();
int height = bitmapOrg.getHeight();
float scaleWidth = metrics.scaledDensity/5;
//set image in imageView
imageView.setImageBitmap(bitmapOrg);
//set imageView dynamic width and height
imageView.getLayoutParam().width = scaleWidth;
imageView.getLayoutParam().height= scaleWidth;
}
Or
Maybe try a different approach...you can create SquareImageView to scaling of images to screen density of width and height.
Related
FFor the sake of simplicity it is better to show you the problem and then describe it
I plan to set the minimum width of the window to the minimum size possible before the pane (groupPane in this example) starts being clipped
how can i calculate that width beforehand.
the fxml section :
the current calculation method:
public void setupMinStageSizeInStandardMode(Stage primaryStage, Scene scene)
{
// the thickness of the border of the window
ObjectBinding<Insets> insets = Bindings.createObjectBinding(() ->
new Insets(scene.getY(),
primaryStage.getWidth()-scene.getWidth() - scene.getX(),
primaryStage.getHeight()-scene.getHeight() - scene.getY(),
scene.getX()),
scene.xProperty(),
scene.yProperty(),
scene.widthProperty(),
scene.heightProperty(),
primaryStage.widthProperty(),
primaryStage.heightProperty()
);
//i am trying to get the grid to the smallest size here
controlsGrid.setMaxWidth(0);
controlsGrid.setPrefWidth(0);
// then i am trying to calculate the wanted size
double minStageWidth = controlsGrid.getWidth() +insets.get().getLeft() + insets.get().getRight();
double minStageHeight = controlsGrid.getHeight() +insets.get().getTop() + insets.get().getBottom();
System.out.println(minStageWidth);
System.out.println(minStageHeight);
//then return the grid to it's intended size
controlsGrid.setMaxWidth(Region.USE_PREF_SIZE);
controlsGrid.setPrefWidth(Region.USE_PREF_SIZE);
primaryStage.setMinHeight(minStageHeight);
primaryStage.setMinWidth(minStageWidth);
}
Please help. i am losing sleep over this...
This may sound like a duplicate of Set maximum size for JavaFX ImageView but it's different.
I'd like to restrict the maximum size of an ImageView. Unfortunately, the only way to set the ImageView's size seems to be fitWidth and fitHeight which however enlarges the image if it's smaller than the fit values.
I tried setting fitWidth/fitHeight to 0/0 and wrap the ImageView into a pane with maxWidth set - no success (image is displayed in original size).
To me it seems as this is not achievable by JavaFX, however I can't believe it. But I couldn't find anything online. Are there any tricks/bugs/workarounds on this?
If you dont want the image to stretch, you can use:
setPreserveRatio(true);
Then you are able to fit width and height as you want
ImageView setPreserveRatio javadoc
In javadoc in this method there are the rules of scaling too
You just needed to add in if statement to set those larger than maxsize to a fixed size. The rest would remain their original size.
ImageView im = new ImageView();
im.setImage(image);
im.maxHeight(690 - 10);
int yoursize = 690;
if(im.maxHeight(690 - 10)> yoursize ){
im.setFitHeight(690- 10);
System.out.println("Fix Size : 690 ");
}
im.setPreserveRatio(true);
im.setSmooth(true);
im.setCache(true);
You can get the actual Image resource and query its width/height to use for the fit values:
Image image = imageView.getImage();
double nativeWidth = image.getWidth();
double nativeHeight = image.getHeight();
I want to use an ImageView to resize an image, however the image is not being resized:
ImageView imageView = new ImageView(image);
imageView.setPreserveRatio(true);
imageView.setFitHeight(40);
System.out.println("imageview image width = " + imageView.getImage().getWidth());
System.out.println("imageview image height = " + imageView.getImage().getHeight());
The output is
imageview image width = 674.0
imageview image height = 888.0
However, the width should be 40. My ImageView is not attached to any scene and I also don't want to attach it, it shall only be used for image resizing. Is there any way to force the ImageView to resize its image, even though the ImageView is not attached to any scene? The reason I am using an ImageView for resizing is, that I want to resize an Image in RAM, without reading it again from the disk, please see this question for more details.
Thanks for any hint!
Using an ImageView for resizing seems to be very hacky.
A better approach is to convert your Image into a BufferedImage and do the resizing the old way. (JavaFx does not (yet) provide an internal way to resize memory images)
int width = 500; // desired size
int height = 400;
Image original = ...; // fx image
BufferedImage img = new BufferedImage(
(int)original.getWidth(),
(int)original.getHeight(),
BufferedImage.TYPE_INT_ARGB);
SwingFXUtils.fromFXImage(original, img);
BufferedImage rescaled = Scalr.rescaleImage(img, width, heigth); // the actual rescale
// convert back to FX image
WritableImage rescaledFX = new WritableImage(width, heigth);
SwingFXUtils.toFXImage(rescaled, rescaledFX);
Where as Scalr is a nice library for resizing images in native java. Obviously, you can use other/simpler methods of rescaling, but the image quality won't be that nice.
I've a GtkToolBar which has say 3 GtkToolButtons with each of these having a stock icon value, and hence they all appear in the same size; now I added a 4th GtkToolButton with a custom image (.png), which was of an arbitrary dimension and only this button ended up looking huge (since the image was of higher resolution). What do I do to scale this GtkToolButton to match the other 3 buttons?
Here's the code which does what I briefed about:
GtkWidget *custom_icon = gtk_image_new_from_file(path);
GtkToolItem *toolbar_item = gtk_toggle_tool_button_new();
gtk_tool_button_set_icon_widget(GTK_TOOL_BUTTON(toolbar_item), custom_icon);
gtk_tool_button_set_label(GTK_TOOL_BUTTON(toolbar_item), "Custom Item");
gtk_toolbar_insert(toolbar, toolbar_item, -1);
Here is another solution.
GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(icon_file_path, NULL);
int width, height;
gdk_pixbuf_get_file_info (icon_file_path, &width, &height);
gtk_icon_theme_add_builtin_icon ("custom_icon", width, pixbuf);
g_object_unref (G_OBJECT (pixbuf));
GtkToolItem *toolbar_item = gtk_toggle_tool_button_new();
gtk_tool_button_set_icon_name (GTK_TOOL_BUTTON(toolbar_item), "custom_icon");
If you have the image in different sizes, you can add them all and let Gtk choose the one of the correct size (or resize if not found): Just repeat the first five lines for each of the image files.
You can use your icon anywhere else and its size will also be adjusted automatically.
For example, to use it for your main window:
gtk_window_set_icon_name(GTK_WINDOW(main_window), "custom_icon");
Found it out myself! Here's the trick so that it helps someone like me. Query the icon size from the stock menu item, which is a enum (standard values like GTK_ICON_SIZE_BUTTON, GTK_ICON_SIZE_LARGE_TOOLBAR, etc.). Now get the pixel size using gtk_icon_size_lookup. Create a pixbuf from the custom icon/image file with the right dimensions. Create a GtkImage from that and set it to the new menu item and you're done!
GtkToolItem *stock_menu_item = gtk_toggle_tool_button_new_from_stock(GTK_STOCK_NEW);
GtkIconSize toolbar_icon_size = gtk_tool_item_get_icon_size(stock_menu_item);
gint width = 0, height = 0;
gtk_icon_size_lookup(toolbar_icon_size, &width, &height);
GdkPixbuf *app_icon = gdk_pixbuf_new_from_file_at_size(icon_file_path, width, height, NULL);
GtkImage *tray_icon = gtk_image_new_from_pixbuf(app_icon);
g_object_unref(app_icon);
app_icon = NULL;
GtkToolItem *toolbar_item = gtk_toggle_tool_button_new();
gtk_tool_button_set_icon_widget(GTK_TOOL_BUTTON(toolbar_item), tray_icon);
I am trying to display a bytearray as a resized image. The Image is displaying correctly, but the sizing is off. Let me explain.
First I have the image data encoded so I need to decode the image data
// Instantiate decoder
var decoder:Base64Decoder = new Base64Decoder();
// Decode image data
decoded.decode(picture.data);
// Export data as a byteArray
var byteArray:ByteArray = decoder.toByteArray();
// Display image
var img:Image = new Image();
img.load(byteArray);
This works. The image is displayed correctly. However, if I hardcode the image (img) height the resized image is shown correctly, but within a box with the original image's dimensions.
For example, if the original image has a height of 300px and a width of 200px and the img.height property is set to 75; the resized image with height of 75 is shown correctly. But the resized image is shown in the upper left corner of the img container that is still set to a height of 300px and a width of 200px. Why does it do that? And what is the fix?
The best way to illustrate the problem is by placing the image inside a VBox and show the borders of the VBox. From the code block above, if I change the image height and set the image to maintain aspect ratio (which by default is set to true but I add it here for completeness). the problem becomes clear.
// Display image
var img:Image = new Image();
img.height = 75; // Hardcode image height (thumbnail)
img.maintainAspectRatio = true;
img.load(byteArray);
// Encapsulate the image inside a VBox to illustrate the problem
var vb:VBox = new VBox();
vb.setStyle('borderStyle', 'solid');
vb.setStyle('borderColor', 'red');
vb.setStyle('borderThickness', 2);
vb.addChild(img);
I have been working on this problem for days and cannot come up with a solution. Any ideas? What am I missing?
The workaround I used is as follows:
I created an event listener for the img display object. Then after the img has loaded, I manually set the height and width of the image. I know what I want the height (preHeight) to be so that is hardcoded. I then calculate the width and set that as the image width. For some reason I had to use the explicitHeight and explicitWidth properties to finally get the sizing right.
I hope this helps someone.
img.addEventListener(FlexEvent.CREATION_COMPLETE, onCreationComplete);
private function onCreationComplete(event:FlexEvent) : void
{
img.addEventListener(Event.COMPLETE, onImageLoadComplete);
}
private function onImageLoadComplete(event:Event) : void
{
var image:Image = event.currentTarget as Image;
var preHeight:Number = 0;
var h:uint = Bitmap(image.content).bitmapData.height;
var w:uint = Bitmap(image.content).bitmapData.width;
// Check height
preHeight = h > 170 ? 170 : h;
// Set the width
img.explicitWidth = (preHeight * w)/h;
img.explicitHeight = preHeight;
}