I'm wondering about the behavior of {Shape}.attr("fill","url({image.path})").
when applying a fill image to a shape:
public class AppMapCanvas extends Raphael {
public AppMapCanvas(int width, int height) {
super(width, height);
this.hCenter = width / 2;
this.vCenter = height / 2;
...
Rect rect = this.new Rect(hCenter, vCenter, 144, 40, 4);
rect.attr("fill", "url('../images/app-module-1-bg.png')"); // <--
...
}
}
The background image seem to teal accross the canvas behind the shape, thus gets weird positioning (an illustration snapshot is enclosed - i marked the original image borders in red).
This seem to resolve itself in the presence of an animation along a path (a mere path.M(0,0) is sufficiant).
How can i position the fill-image properly in the first place?
The proper way to do this from what I can understand would be to use an SVG pattern declaration to specify the portion and position of the image you would want to use. Then you would use that pattern to fill the rectangle element. Unfortunately, the Raphael javascript library doesn't have support for patterns... so there's no direct way to use an image to fill a rectangle.
Related
I am trying to use de Image Button on LIBGDX to create a button based on two images.
Using add to second image, works fine, but have one problem.
The images are of different sizes.
Note: I am testing with the same picture to see the result
Is there a way to correct this? Using some scale to the images?
levelsTexture = new Texture(Gdx.files.internal("level1.png"));
levels = new TextureRegion(levelsTexture).split(TILE_WIDTH, TILE_HEIGHT);
ImageButton levels_image = new ImageButton(new TextureRegionDrawable(new
TextureRegion(levels[0][0])));
levels_image.add(new Image (levels[0][0]));
stage.addActor(levels_image);
levels_image.setScale(2f);
The problem:
ImageButton is an extension of the Table class and typically the ImageButton images are set as the background. Using the "add" method for the second image like you did might work kind of, but it behaves differently than setting the background and it also might not be what you want if you want the the second image to also change when you click the button.
The easiest way to add two images to a single ImageButton would be to simply combine the two images in Photoshop (or equivalent) and use that single image on the ImageButton.
The more advanced (and more flexible) method would be to combine the two images programmatically and use this as the background for your ImageButton. This can be done by creating a custom class which extends BaseDrawable and have it take two Images in the constructor. If you want your images stacked on top of each other, set the minHeight of your custom drawable class to be the combined height of your two images. Then override the draw method and draw your two images on top of each other like this:
#Override
public void draw(Batch batch, float x, float y, float width, float height){
img1.getDrawable().draw(batch, x, y, img1.getWidth(), img1.getHeight());
img2.getDrawable().draw(batch, x, y+img1.getHeight(), img2.getWidth(), img2.getHeight());
}
}
The ImageButton takes a Drawable in its constructor, so you can pass this object right into the button when you create it and both of your Images should appear in the button and they will be treated as one.
I've done something similar to make a background for a table using multiple Images and this method works great.
I wrote my own SpriteButton class in which I implement this method for scaling my textures.
private Dimension getScaledDimension(Dimension imgSize, Dimension boundary) {
int original_width = imgSize.width;
int original_height = imgSize.height;
int bound_width = boundary.width;
int bound_height = boundary.height;
int new_width = original_width;
int new_height = original_height;
// first check if we need to scale width
if (original_width > bound_width) {
//scale width to fit
new_width = bound_width;
//scale height to maintain aspect ratio
new_height = (new_width * original_height) / original_width;
}
// then check if we need to scale even with the new height
if (new_height > bound_height) {
//scale height to fit instead
new_height = bound_height;
//scale width to maintain aspect ratio
new_width = (new_height * original_width) / original_height;
}
return new Dimension(new_width, new_height);
}
Then finally you draw the texture with the output dimension as as size to draw.
sb.begin();
sb.draw(this.texture2, this.x, this.y, dim_size_new.width, dim_size_new.height);
sb.end();
So you could technically draw the second image to the size of the the first image, if the first image size is correct.
Your implementation will look different from mine but you should be able to figure it out form here on out.
Does anyone have any ideas on how to set the background color on the PdfSignatureAppearance rectangle in iTextSharp? I create the PdfSignatureAppearance object and can set its positioning on the page, but the rectangle only has a transparent background. I'm trying to apply a color (any really).
I've tried creating a new iTextSharp.text.Rectangle then setting the rect.BackgroundColor = new BaseColor(System.Drawing.Color.Yellow); That doesn't work. I saw someone else trying to something similar by applying the styles to the layer2 of the signature appearance object. I've tried these with no luck.
PdfTemplate sigAppLayer2 = appearance.GetLayer(2);
sigAppLayer2.SetRGBColorFill(255, 0, 0);
sigAppLayer2.SetGrayFill(2);
sigAppLayer2.BoundingBox.BackgroundColor = new BaseColor(System.Drawing.Color.Yellow);
Anytime I try one of the above styling changes to the layer2 the visible signature disappears on the PDF. If I try applying it to layer 0 or layer 1 then nothing happens. I'm assuming then I'm touching the correct layer (2).
Any ideas? The goal is to just get a background on the signature box vs having it be transparent.
See comment below. I tried this as well setting against layer 2 and layer 0. Both result in a red box, but the signature text is missing.
PdfTemplate sigAppLayer2 = appearance.GetLayer(2);
Rectangle rect = sigAppLayer2.BoundingBox;
PdfTemplate sigAppLayer0 = appearance.GetLayer(0);
sigAppLayer0.SetRGBColorFill(255, 0, 0);
sigAppLayer0.Rectangle(rect.Left, rect.Bottom, rect.Width, rect.Height);
sigAppLayer0.Fill();
You need to draw the rectangle and fill that rectangle with the fill color.
From memory (untested), you need something like this:
PdfTemplate sigAppLayer2 = appearance.GetLayer(2);
Rectangle rect = sigAppLayer2.BoundingBox;
sigAppLayer2.SetRGBColorFill(255, 0, 0);
sigAppLayer2.Rectangle(rect.Left, rect.Bottom, rect.Width, rect.Height);
sigAppLayer2.Fill();
This is the way:
PdfTemplate sigAppLayer2 = appearance.GetLayer(2);
Rectangle rect = sigAppLayer2.BoundingBox;
sigAppLayer2.SetRGBColorFill(255, 0, 0);
sigAppLayer2.Rectangle(rect.Left, rect.Bottom, rect.Width, rect.Height);
sigAppLayer2.Fill();
sigAppLayer2.ResetRGBColorFill();// <--------- you needs this
sigAppLayer2.BeginText() ...etc
I'm trying to create a label decorator to add an icon to the top left of my file icons. I see that the little red X can be drawn off of the edge of the icon, but my radiation symbol is cut off at the edge.
l
#Override
public Image decorateImage(Image image, Object element) {
Image failureImg = Activator.imageDescriptorFromPlugin(IMAGE PATH).createImage();
GC gc = new GC(image);
gc.drawImage(failureImg, 0, 0, failureImg.getImageData().width, failureImg.getImageData().height,
0, 0, 11, 11);
gc.dispose();
return image;
}
Any ideas on how to draw outside of the bounds of the file icon?
It is easier to use a lightweight label decorator (implement ILightweightLabelDecorator and specify lightweight="true" in the extension point).
You can then add the decoration image with:
#Override
public void decorate(final Object element, final IDecoration decoration)
{
ImageDescriptor imageDescriptor = Activator.imageDescriptorFromPlugin(IMAGE PATH);
decoration.addOverlay(imageDescriptor, IDecoration.TOP_LEFT);
}
Since lightweight decorators are run in a background thread they also make the UI more responsive.
Note: Your code is creating Image objects and not arranging for them to be disposed - this leaks resource handles. The lightweight decorator does not have this issue.
I'd like to have a canvas on my html page, with width = 100%. I'd like to then get the width in pixels of the canvas at runtime. Something like:
Canvas c = Canvas.createIfSupported();
c.setWidth("100%");
c.setHeight("100%");
// let's draw a rectangle to fill the whole canvas:
c.getContext2d().rect(0, 0, ?, ?); // <-- what's its actual width/height?
Thanks
It's (surprisingly)
c.getContext2d().rect(0, 0, 299, 149);
... no matter what the actual pixel size of the canvas is. The reason is, that 300x150 is the default coordinate space size, see http://www.whatwg.org/specs/web-apps/current-work/multipage/the-canvas-element.html#the-canvas-element
You can change this by using canvas.setCoordinateSpaceWidth() and canvas.setCoordinateSpaceHeight() to anything you want.
Often, people want to draw independently of the actual size of the canvas, so they just set the coordinate space to something like 100x100, and the drawn image gets scaled automatically.
However, you may want to find out about the actual canvas pixel size:
Scheduler.get().scheduleDeferred(new ScheduledCommand() {
#Override
public void execute() {
final int clientWidth = canvas.getElement().getClientWidth();
final int clientHeight = canvas.getElement().getClientHeight();
setupCoordinateSpace(canvas, clientWidth, clientHeight);
drawMyImage(canvas);
}
});
Note, that this must be done in scheduleDeferred, because the client size will only be known after the browser had a chance to perform the layout.
You can use this information to adjust the aspect ratio to match the canvas (which I would recommend, because otherwise you get distorted images)
void setupCoordinateSpace(Canvas canvas, int clientWidth, int clientHeight) {
final double aspect = (double) clientWidth / (double) clientHeight;
canvas.setCoordinateSpaceHeight(
(int) (myCoordinateSpaceWidth / aspect));
}
Or, alternatively, you can also set the coordinate space to match the pixel size, so you can perform pixel-exact drawing on an HTML5 canvas:
void setupCoordinateSpace(Canvas canvas, int clientWidth, int clientHeight) {
canvas.setCoordinateSpaceWidth(clientWidth);
canvas.setCoordinateSpaceHeight(clientHeight);
}
After the coordinate space has been set up, you can call drawMyImage()
use canvas width and height methods
var width = c.width;
var height = c.height;
I am in the process of adding drag and drop support to an existing Mono/C#/GTK# application. I was wondering whether it was possible to use RGBA transparency on the icons that appear under the mouse pointer when I start dragging an object.
So far, I realized the following:
I can set the bitmap in question by calling the Gtk.Drag.SourceSetIconPixbuf() method. However, no luck with alpha transparency: pixels that are not fully opaque would get 100% transparent this way.
I also tried calling RenderPixmapAndMask() on the GdkPixbuf so that I could use Gtk.Drag.SourceSetIcon() with an RGBA colormap of my Screen. It didn't work either: whenever I started dragging, I got the following error:
[Gdk] IA__gdk_window_set_back_pixmap: assertion 'pixmap == NULL || gdk_drawable_get_depth (window) == gdk_drawable_get_depth (pixmap)' failed.
This way, the pixmap doesn't even get copied, only a white shape (presumably set by the mask argument of SetSourceIcon()) shows up on dragging.
I'd like to ask if there's a way to make these icons have alpha transparency, despite the fact that I failed to do so. In case it's impossible, answers discussing the reasons of the lack of this feature would also be helpful. Thank you.
(Compositing is - of course - enabled on my desktop (Ubuntu/10.10, Compiz/0.8.6-0ubuntu9).)
Ok, finally I solved it. You should create a new Gtk.Window of POPUP type, set its Colormap to your screen's RGBA colormap, have the background erased by Cairo to a transparent color, draw whatever you'd like on it and finally pass it on to Gtk.Drag.SetIconWidget().
Sample code (presumably you'll want to use this inside OnDragBegin, or at a point where you have a valid drag context to be passed to SetIconWidget()):
Gtk.Window window = new Gtk.Window (Gtk.WindowType.Popup);
window.Colormap = window.Screen.RgbaColormap;
window.AppPaintable = true;
window.Decorated = false;
window.Resize (/* specify width, height */);
/* The cairo context can only be created when the window is being drawn by the
* window manager, so wrap drawing code into an ExposeEvent delegate. */
window.ExposeEvent += delegate {
Context ctx = Gdk.CairoHelper.Create (window.GdkWindow);
/* Erase the background */
ctx.SetSourceRGBA (0, 0, 0, 0);
ctx.Operator = Operator.Source;
ctx.Paint ();
/* Draw whatever you'd like to here, and then clean up by calling
Dispose() on the context's target. */
(ctx.Target as IDisposable).Dispose ();
};
Gtk.Drag.SetIconWidget(drag_context, window, 10, 10);