Is there an easy way to grey out a sprite? I'm disabling a button, and I know how to do that, but wants to convey that in the GUI.
You can apply the ColorMatrixFilter to your Sprite with the approximate values that makes color greyscaled.
sprite.filters = [ new ColorMatrixFilter([0.3086, 0.6094, 0.0820, 0, 0, 0.3086, 0.6094, 0.0820, 0, 0, 0.3086, 0.6094, 0.0820, 0, 0, 0, 0, 0, 1, 0]) ];
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Is it possible to set value of alpha channel when providing fill and stroke colors in PDFlib?
$p->setlinewidth(20);
$p->setcolor('fill', 'rgb', 1, 0, 0, null);
$p->setcolor('stroke', 'rgb', 0, 1, 0, null);
$p->rect(0, 0, 100, 100);
$p->fill_stroke();
Is it possible to make rectangle's red fill and thick green border to be semi-transparent?
Is it possible to make rectangle's red fill and thick green border to be semi-transparent?
sure, please use GState for this task. You find a complete sample code within the PDFlib cookbook: Transparent Graphics
/* Save the current graphics state. The save/restore of the current
* state is not necessarily required, but it will help you get back to
* a graphics state without any transparency.
*/
$gstate = $p->create_gstate("opacityfill=.5 opacitystroke=.5");
$p->save();
$p->set_gstate($gstate);
$p->setlinewidth(20);
$p->setcolor('fill', 'rgb', 1, 0, 0, null);
$p->setcolor('stroke', 'rgb', 0, 1, 0, null);
$p->rect(0, 0, 100, 100);
$p->fill_stroke();
$p->restore();
For a powerful path generation, you might use the Path object. See PDFlib 9.2 Documentation as well the samples within PDFlib Cookbook - path objects.
page.drawText(WATERMARK.LABEL, {
x: 180,
y: 400,
size: 30,
font: helveticaFont,
color: rgb(220 / 255, 220 / 255, 220 / 255),
rotate: degrees(-315),
opacity: 0.6
})
// add opacity field only
After adding intersection box for sectional viewing of model using sectional analysis tool, is it possible to get its bounding box information?
original model
intersect box view whose bounding box needs to be extracted
You can access the geometry info of the section box via sectionExtension.tool:
const sb = viewer.getExtension('Autodesk.Section')
sb.tool.getSectionBoxValues()
//sectionBox: (6) [-2.8294310569763184, -6.648449420928955, -9.332106590270996, -0.0652092695236206, -1.3873761892318726, -3.4865833520889282]
//sectionBoxTransform: (16) [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1]
I am trying to create an overlay that can highlight certain portions of the page. The best way I've figured out to do this is to use a canvas fit to the page, draw the shapes I need, and draw a rectangle using this trick:
ctx.rect(canvas.width, 0, 0 - canvas.width, canvas.height);
I'm not sure I can explain this well, so it might be best to look at the jsFiddle example here to get an idea of what I am trying to do.
This works perfectly in every browser except Safari. Is there any way to achieve this effect in Safari?
You can try filling the whole canvas first, then use composite mode to knock out the shapes.
Example:
ctx.fillStyle = "rgba(0, 0, 0, 0.5)";
ctx.fillRect(canvas.width, 0, 0 - canvas.width, canvas.height);
// next shape will punch hole in the draw rectangle above
ctx.globalCompositeOperation = 'destination-out';
ctx.fillStyle = "rgba(0, 0, 0, 1)"; // make sure alpha is 100%
ctx.beginPath();
ctx.moveTo(300, 60);
ctx.arc(300, 60, 50, 0, 2 * Math.PI);
ctx.moveTo(500, 160);
ctx.arc(500, 160, 50, 0, 2 * Math.PI);
drawEllipse(ctx, 103, 23, 100, 30)
drawEllipse(ctx, 503, 23, 100, 30)
ctx.fill();
ctx.globalCompositeOperation = 'source-over'; // reset comp. mode
Modifed fiddle here
Alpha (not the color) will determine how much visible the hole will be.
Hope this helps.
I would like to do some standard color transformation on a Loader object (Which is used to display a picture) like Sepia, Black & White etc...
I'm currently using methods like this one :
var colorTransformer:ColorTransform = selectedItm.transform.colorTransform;
colorTransformer.redMultiplier = 1/6;
colorTransformer.greenMultiplier = 1/5;
colorTransformer.blueMultiplier = 1/3;
selectedItm.transform.colorTransform = colorTransformer;
But I dont know how obtain a Sepia or a Black and White effect. Is there a function to do this ? If not is there some kind of database which contains "multiplier" to obtains effect ?
You'll have to explore to fine tune a sepia filter:
var sepia = new flash.filters.ColorMatrixFilter();
sepia.matrix = [0.3930000066757202, 0.7689999938011169,
0.1889999955892563, 0, 0, 0.3490000069141388,
0.6859999895095825, 0.1679999977350235, 0, 0,
0.2720000147819519, 0.5339999794960022,
0.1309999972581863, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1];
Online color transform generators can help for real time tuning:
Online matrix generator:
http://www.onebyonedesign.com/flash/matrixGenerator/
I'm drawing stuff on a bitmapData and I need to continuously fade every pixel to 0x808080 while still drawing (its for a DisplacementMapFilter)...
I think this illustrates my problem:
http://www.ventdaval.com/lab/grey.swf
The simpler approach I tried was drawing a semi-transparent grey box on it, but it never reaches a single color (i.e. 0x808081 will never be turned to 0x808080)... The same kind of thing happens with a ColorMatrixFilter trying to progressively reduce the saturation and/or contrast. (the example above is applying a filter with -10 contrast every frame).
I'm trying paletteMap now, and I'm sensing this could be the way to go, but I haven't been able to get it... any ideas?
You can try to fade it slightly more than you are fading it now, so color will go to 0x808080, you just need to do some calculations.
Yes, you can do this with paletteMap.
The third way will be to write PixelBender shader for it.
You can also use your normal fading and do paletteMap or PixelBender one once in a few frames, to speed-up all this.
I think the easiest way to do this would be with two successive color filters. That is:
var n:Number = 0.9;
var off:Number = 0x80;
var filter:ColorMatrixFilter = new ColorMatrixFilter( [
1, 0, 0, 0, -off,
0, 1, 0, 0, -off,
0, 0, 1, 0, -off,
0, 0, 0, 1, -off ] );
var filter2:ColorMatrixFilter = new ColorMatrixFilter( [
n, 0, 0, 0, off,
0, n, 0, 0, off,
0, 0, n, 0, off,
0, 0, 0, n, off ] );
function onFrame( e:Event ) {
myBMD.applyFilter( myBMD, myBMD.rect, new Point(), filter );
myBMD.applyFilter( myBMD, myBMD.rect, new Point(), filter2 );
}
The first filter offsets each channel value downwards by 128 - turning your gray-based image into a black-based image. The second filter multiplies each channel value by the modulator (0.9 in my example), and then offsets the values back up by 128.
I wound up solving this by filling the texture with 0xFF808080 every frame, then drawing my dynamic stuff to a second, transparent bitmap, doing a colortransform on it with a lower alpha multiplier (say 0.98), and then copypixeling that bitmap to the main bitmap with mergealpha on. Works a treat:
public function update():void
{
lock();
fillRect(rect, 0xFF808080);
drawTarget.lock();
drawTarget.colorTransform(rect, fadeTransform);
drawTarget.applyFilter(drawTarget, rect, pt, blurFilter);
drawTarget.unlock();
copyPixels(drawTarget, rect, pt, null, null, true);
unlock();
}