Using Java JDK 1.8.0_45 on Windows 8.1, I’m attempting to obtain good quality text printing using JavaFx 8, but cannot get a print quality equal to that obtained using the free Adobe reader with a PDF file. The Adobe quality appears identical to that from a test print from ControlPanel>Devices and Printers>Epson Nx230>Print Test Page, both of which are good quality.
The print quality using a JavaFx Canvas is reasonable quality but fuzzy. It is certainly not a suitable standard for corporate reports.
The code I am using to create the JavaFx printout is basically as follows although I have tried a number of variations which have not improved the quality :
Canvas canvas = new Canvas(pageWidth, pageHeight);
GraphicsContext gc = canvas.getGraphicsContext2D();
gc.setFont(Font.font("Arial", FontWeight.BOLD, 12));
gc.setFill(Color.BLACK);
gc.fillText(pHed + pageNr, 20, 20); // Page Heading
PrinterJob printerJob = PrinterJob.createPrinterJob();
printerJob.printPage(canvas);
The default printer is the same as used by the Adobe Reader. The resulting print-quality from JavaFx is fuzzy. Comparable print-quality produced by the Adobe PDF Reader is far superior and the test print using the Epson driver is of equal good quality to Adobe. Using other fonts including the default font appear to make little difference.
Is there a way to achieve better quality printing in JavaFx?
Related
We are looking at using the Forge Viewer for a project to display and markup plans, etc. (for now just 2D, 3D may be added in the future). For some of these items we will have DWG Files that we can convert using model derivative API so no problem there. However, the client also has quite a few existing drawings saved in svg format from their legacy system.
The question is if there is a good way to convert those base svg files into svf that we can display as the 'main' drawing/view in Forge Viewer. I have found things about creating a markup layer from an svg file, but that's not really what we want. We would be using markups to have the user draw on top of the plan with their own tools and place markers, etc. but the main drawing should be from the svg file that they have.
Forgive me if this is simple but I'm fairly new to the viewer and model derivative API so I'm not figuring out how to make this work.
There is no translation support for SVG, to generate an SVF model out of it.
You could either
a) use the SVG inside a format that we support (e.g. DWG - perhaps place the SVG in it using Design Automation API) and translate that to SVF
b) load a dummy model as shown here, and then add the SVG as e.g. markup
Our project uses images with bit depths higher than 8 bits, typically 10 bit. These are stored with 16bit PNGs, with P3 colorspace (so 1024 colors per channel).
I am trying to show these images in a browser using WebGL2. So far having no luck. I know Chrome can do it as I have some test images which reveal an extended colour range on my Macbook's retina screen (but not on an 8bit, external monitor).
Here's the test image: https://webkit.org/blog-files/color-gamut/Webkit-logo-P3.png (Source: https://webkit.org/blog/6682/improving-color-on-the-web/)
If you're using an 8 bit screen and hardware, the test image will look entirely red. If you have a high bit depth monitor, you'll see a faint webkit logo. Despite my high bit depth monitor showing the logo detail in Chrome, a WebGL quad with this texture applied looks flat red.
My research has shown that WebGL/OpenGL does offer support for floating point textures and high bit depth, at least when drawing to a render target.
What I want to achieve is simple, use a high bit depth texture in WebGL, applied to an on-screen quad. Here's how I am loading the texture:
var texture = gl.createTexture();
gl.activeTexture(gl.TEXTURE0 + 0);
gl.bindTexture(gl.TEXTURE_2D, texture);
// Store as a 16 bit float
var texInternalFormat = gl.RGBA16F;
var texFormat = gl.RGBA16F;
var texType = gl.FLOAT;
var image = new Image();
image.src = "10bitTest.png";
image.addEventListener('load', function() {
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(
gl.TEXTURE_2D,
0,
texInternalFormat,
texFormat,
texType,
image
);
gl.generateMipmap(gl.TEXTURE_2D);
});
This fails with
WebGL: INVALID_ENUM: texImage2D: invalid format
If I change texFormat to gl.RBGA, it renders the quad, but plain red, without the extended colours.
I'm wondering if its possible at all, although Chrome can do it so I am still holding out hope.
AFAIK
You can not (as of June 2020) create a canvas that is more than 8bits per channel in any browser. There are proposals but none have shipped
You can not load > 8bit per channel images into WebGL via img or ImageBitmap. There are no tests that data > 8bits makes in into the textures.
You can load a > 8bit per channel image into a texture if you parse and load the image yourself in JavaScript but then you fall back to problem #1 which is you can not display it except to draw it into an 8bit per channel canvas. You coud pull the data back out into JavaScript, generate a 16bit image blob, get a URL for the blob, add an img tag using that URL and pray the browser supports drawing it with > 8bits per channel.
For the record, this is not currently possible. Recent activity looks promising:
https://bugs.chromium.org/p/chromium/issues/detail?id=1083693&can=2&q=component%3ABlink%3ECanvas%20colorspace
I have developed an LWUIT app. I have two types of images dispayed in the app. One coming from server side that need to displayed (like a photo posted and saved to server side) and one packaged in my jar and displayed mainly as icons (like a music icon, loading animation gif etc). I need to display all images according to the sreen size and resolution. The first kind is displayed by taking the screen display height and width and then use scale method and show a scaled version of the image. But however I have no idea how to show the second kind. i.e. icons. Example, my loading image looks good in most of the phones but for some phones like samsung, it looks blurred and over-sized. How to do this. My basic idea is to keep 3 types of images of icons like icon_width_lowXheight_low.png, icon_width_mediumXheight_medium.png and image_width_highXheight_high.png and show it based on the screen size. Please let me know the bets way to achieve this?
Thanks,
Parvathy
You should use MultiImages which were added in LWUIT 1.5. I don't have a link for this in LWUIT but our work in Codename One is pretty close to this so check out the How Do I? on multi images (and I suggest migration to Codename One regardless).
I think that you will need to use this
Image i = Image.createImage("your image path here");
i = i.scaled(widthValue, heightValue);
And put this values in relation to the Display.getInstance().getDisplayHeight() and Display.getInstance().getDisplayWidth()
Right?
I want to build a website that looks exactly the same across all screen width's, which means the whole website will scale according to the screen's, or more accurately, the viewport's width.
This is relatively easy to do for SVG images and I have all images correctly scaling according to the viewport's width. The viewport's width is the point of reference, from which all images scale. However, the point of reference for the text is different between any desktop browser and the iPhone's Safari (and I assume any mobile browser).
According to my research there seem to be two possible reasons for different sized text: a difference in the default CSS's or a difference in the rendering engines. Since I can't find any reference to pixel sized text on Chrome's default CSS or Firefox's default CSS, I assume this setting comes from the rendering engine.
My IP is dynamic so I can't provide a live example, but here are the screens comparing the same site in iPhone's Safari and Chrome on the desktop. Notice the huge difference in the size of the text.
Is there any way I can make the text have the same relative size in both these browsers?
I found the answer in JavaScript:
onresize=onload=function(){
document.body.style.fontSize=window.innerWidth/20+"px"
}
which sets the text size according to the viewport's width on the body element. Since all the text set in em's is sized in relation to their parents, all the text is sized correctly from the body element.
Furthermore, if you want to avoid the cascading hell by using rems and respect the original layout design from a let's say 1024px width you can stick with this:
onresize = onload = function(){
document.querySelector("html").style.fontSize = ( innerWidth * 100 ) / 1024 + "%";
}
You should try CSS Unit vw, like this:
body { font-size: 1.5vw; }
However, i am not sure it is supported by mobile browsers...
EDIT
Check for browser compatibility here.
On my website lukewattchow.zzl.org/ I have made it so that when the browser window scales down the website also scales down. However the text inside the divs need to scale down with the background, and images at the same time. Can anyone help?
i assume you will require some Javascript to adjust font size of the BODY based on some fraction of the browser's width:
(untested pseudo-code; since i never write anything HTML, CSS, or ECMAScript)
var body = document.getElementById("theBody");
var fontSizeInPixels = (16*1680)/document.documentElement.clientHeight;
//nominal font size of 12pt (16px) with a 1650px wide browser window
body.style.font-size = fontSizeInPixels+"px";
Edit:
Microsoft had a good article on handling dpi changes:
Making the Web Bigger: DPI Scaling and Internet Explorer 8
Maybe this answer that I just wrote in other question about the same problem can help you