I have several fonts that I would like to use that are basically outlines of letters, but the insides are transparent. How would I go about filling only the inside areas of these fonts with with a color? I suspect it would be using the special blitting RGBA_BLEND modes, but I am not familiar with their functionality.
Here is an example of the font I am using:
https://www.dafont.com/fipps.font?back=bitmap
Right now, I am simply rendering the font onto a surface, and I've written a helper function for that. Ideally I would be able to integrate this into my function.
def renderText(surface, text, font, color, position):
x, y = position[0], position[1]
width, height = font.size(text)
position = x-width//2, y-height//2
render = font.render(text, 1, color)
surface.blit(render, position)
Thank you so much for any help you can give me!
An option is to define a surface the size of the text, fill that with the color you want, and blit the text on that. For example you could do this:
text = font.render('Hello World!', True, (255, 255, 255)
temp_surface = pygame.Surface(text.get_size())
temp_surface.fill((192, 192, 192))
temp_surface.blit(text, (0, 0))
screen.blit(temp_surface, (0, 0))
This will create a temporary surface that should fill in the transparent pixels of a text surface. There is another option of using set_at() but its too expensive in processing power for what you are doing and is best used for pre-processing surfaces.
Im certain that a better option using BLEND_RGBA_MULT will come from a more experienced user. Im not too good at blending modes either.
Adding camera functionality to my app is killing me! Started with the basic UWP camera sample, but I have to add zooming capability which added a ScrollViewer around the preview control and complicated my life. Found the cropping code in a different sample. Everything works in landscape, but when you rotate the tablet to portrait the cropped image (even without any actual cropping) is rotated 90.
The cropping logic takes originX/Y, ScrollViewer.ViewportWidth/Height & ScrollViewer.ExtentWidth/Height. I don't understand how these values change with the rotation! In Landscape I use topLeft for the X/Y. What would I do for Portrait? I'm setting the width to 400 and in both views it's STILL 400 so I don't believe width/height should be flipped.
Here's the cropping code. Can anyone comment on what should be different for the 2 (actually 4) orientations?
async public static Task<WriteableBitmap> GetCroppedBitmapAsync(StorageFile originalImageFile,
Point startPoint, Size cropSize, Size previewSize)
{
using (IRandomAccessStream stream = await originalImageFile.OpenReadAsync())
{
// Create a decoder from the stream. With the decoder, we can get the properties of the image.
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(stream);
// Adjust the start x/y to the stream size
uint scaledStartPointX = (uint)Math.Round((decoder.PixelWidth * (startPoint.X / previewSize.Width)));
uint scaledStartPointY = (uint)Math.Round((decoder.PixelHeight * (startPoint.Y / previewSize.Height)));
// Now get the scaled size of the viewport (ie the cropped area)
uint selectedAreaWidth = (uint)Math.Round(decoder.PixelWidth * (cropSize.Width / previewSize.Width));
uint selectedAreaHeight = (uint)Math.Round(decoder.PixelHeight * (cropSize.Height / previewSize.Height));
// Get the cropped pixels.
byte[] pixels = await GetPixelData(decoder, scaledStartPointX, scaledStartPointY, selectedAreaWidth, selectedAreaHeight,
decoder.PixelWidth, decoder.PixelHeight);
// Stream the bytes into a WriteableBitmap
WriteableBitmap cropBmp = new WriteableBitmap((int)selectedAreaWidth, (int)selectedAreaHeight);
Stream pixStream = cropBmp.PixelBuffer.AsStream();
pixStream.Write(pixels, 0, (int)(selectedAreaWidth * selectedAreaHeight * 4));
return cropBmp;
}
}
I'm trying to set the size of the font using this code:
func setupText(){
let text = SCNText(string: "textString", extrusionDepth: 4)
textNode.geometry = text
textNode.position = SCNVector3Make(0, -200, 5)
scene.rootNode.addChildNode(textNode)
text.alignmentMode = kCAAlignmentCenter
text.font = UIFont(name: "Helvatica", size: 30)
}
I'm changing the size argument but my text doesn't get any bigger or smaller. What am I doing wrong?
It doesn't work because the font isn't being set. The font isn't being set because you misspelled "Helvetica" as "Helvatica".
Changing the font size should work but maybe not as much as you would expect. This depends of the size of your 3d world.
Another way to scale up a 3d text is to scale its node:
textNode.scale = SCNVector3Make( scaleValue, scaleValue, scaleValue); //todo: make me swift
I need to 'scale' text to fill an antire HTML5 canvas. It appears that the scale() method does not affect text. I've seen approximation methods with iterative loops on the measureText() method but this doesn't get me exactly what I need. Ideally I'd like to fill both horizontally and vertically without conserving the aspect ratio. Would SVG possibly be able to help with this?
My bad - Scale DOES apply to text. I've come up with a solution:
context.font = "20px 'Segoe UI'";
var metrics = context.measureText("Testing!");
var textWidth = metrics.width;
var scalex = (canvas.width / textWidth);
var scaley = (canvas.height / 23);
var ypos = (canvas.height / (scaley * 1.25));
context.scale(scalex, scaley);
context.fillText("Testing!", 0, ypos);
Scale does affect text. Try this:
var can = document.getElementById('test');
var ctx = can.getContext('2d');
ctx.fillText("test", 10, 10); // not scaled text
ctx.scale(3,3);
ctx.fillText("test", 10, 10); // scaled text
See it in action here:
http://jsfiddle.net/3zeBk/8/
How can I display vertical text (90 degree rotated) in all browsers?
(source: sun.com)
The problem is independent from the server side language. If it's not a problem when the vertically rendered text isn't text anymore but an image, choose the solution provided by tharkun. Otherwise, there are ways to do it in the presentation layer.
First, there's (at the moment) an IE-only solution, which is part of the CSS3 standard. You can check it live.
p {
writing-mode: tb-rl;
}
The CSS3 text module also specify some properties for text orientation.
Other guys do it with SVG.
I don't think you can rotate text with PHP/HTML/CSS. But you can create an image with GD containing vertical text.
Example:
header ("Content-type: image/png");
// imagecreate (x width, y width)
$img_handle = #imagecreatetruecolor (15, 220) or die ("Cannot Create image");
// ImageColorAllocate (image, red, green, blue)
$back_color = ImageColorAllocate ($img_handle, 0, 0, 0);
$txt_color = ImageColorAllocate ($img_handle, 255, 255, 255);
ImageStringUp ($img_handle, 2, 1, 215, $_GET['text'], $txt_color);
ImagePng ($img_handle);
ImageDestroy($img_handle);
function verticletext($string)
{
$tlen = strlen($string);
for($i=0;$i<$tlen;$i++)
{
$vtext .= substr($string,$i,1)."<br />";
}
return $vtext;
}
there you go no echo
Text rotation is also possible with other browsers.
CSS:
/*Safari*/
-webkit-transform: rotate(-90deg);
/*Firefox*/
-moz-transform: rotate(-90deg);
/*Opera*/
-o-transform: rotate(-90deg);
/*IE*/
writing-mode: tb-rl;
filter: flipV flipH;
I use the function below if table header rows are too long. It's quite useful because it's easy to use, fast and you don't have to calculate text height & width. Those css-gimmicks just don't work.
#######################################################
# convert text to image and embed it to html
# uses /tmp as a cache to make it faster
# usage: print imagetext("Hello my friend");
# Created by Ville Jungman, GPL-licenced, donated by www.varuste.net
function imagetext($text,$size = 10,$color = array(253,128,46)){
$dir = "/tmp/tekstit";
$filename = "$dir/" . base64_encode($text);
if(!file_exists($filename)){
$font = "/usr/share/fonts/truetype/freefont/FreeSans.ttf";
$box = imagettfbbox($size,90,$font,$text);
$w = -$box[4] - 1;
$h = -$box[3];
$im = imagecreatetruecolor($w,$h);
$white = imagecolorallocate($im,$color[1],$color[2],$color[3]);
$black = imagecolorallocate($im, 0x00, 0x00, 0x00);
imagecolortransparent($im,$white);
imagefilledrectangle($im, 0, 0, $size, 99, $white);
imagettftext($im,$size,90,$size,$h,$black,$font,$text);
#mkdir($dir);
imagepng($im,$filename);
imagedestroy($im);
}
$data = base64_encode(file_get_contents($filename));
return "<img src='data:image/png;base64,$data'>";
}
This thread suggests that you can write text to an image and then rotate the image.
It appears to be possible with IE but not with other browsers so it might be one of those little win for IE6 =)
imagettftext oughta do the trick.
As far as I know it's not possible to get vertical text with CSS, so that means that the rotated text has to be in an image. It's very straightforward to generate with PHP's' libgd interface to output an image file.
Note however that this means using one script to produce the image, and another to produce the surrounding web page. You can't generally (inline data: URI's notwithstanding) have one script produce more than one page component.
Use raphaeljs
It works on IE 6 also
http://raphaeljs.com/text-rotation.html
function verticletext($string)
{
$tlen = strlen($string);
for($i=0;$i<$tlen;$i++)
{
echo substr($string,$i,1)."<br />";
}
}