How to apply KineticJS filter ? -


i find kineticjs filters documentation extremely frustrating , not find examples online, considering brightness.

the kinetic.filters docs link mention kinetic.filters.brighten(imagedata) there's no info on how pass parameters or how use it.

all need working example of image on layer on stage, , 2 buttons - 1 make image brighter , 1 make darker. can please me ?

thank !

realy, documentation filters poor.

example brighten filter: (kineticjs 4.5.0)

    darth = new kinetic.image({       x: 10,       y: 10,       image: imageobj,       draggable: true,       filter: kinetic.filters.brighten,       filterbrightness: -50     });

for animate can use tutorial: http://www.html5canvastutorials.com/kineticjs/html5-canvas-tween-blur-filter-with-kineticjs/ 

    var tween = tweenlite.to(darth, 0.6, {       paused: true,       setfilterbrightness: 50,       onupdate: function() {         layer.batchdraw();        }     });

Comments

Post a Comment

Popular posts from this blog

linux - xterm copying to CLIPBOARD using copy-selection causes automatic updating of CLIPBOARD upon mouse selection -

i've tried various ways coerce xterm (versions 285 , 292) copy selection clipboard clipboard whenever press ctrl-shift-c. promising way far has been, in ~/.xresources, put this: xterm*vt100.translations: #override \ ctrl shift <keypress> c: copy-selection(clipboard) \n\ ctrl shift <keypress> v: insert-selection(clipboard) ctrl-shift-v works perfectly, copying has nuance... if restart xterm, highlighting text puts things in primary clipboard; expected, proper, default behavior. if hit ctrl-shift-c, copies current selection clipboard clipboard. the bug, however, if highlight text after first time pressed ctrl-shift-c, you'll see highlighting copies both primary and clipboard. cannot figure out how stop xterm updating clipboard upon selection... , doesn't make sense me in first place. i said, @ specific point in time, copy selection clipboard... yet starts updating automatically upon selection after doing once... anyone have workaround...
Read more

c++ - qgraphicsview horizontal scrolling always has a vertical delta -

Image
i've subclassed qgraphicsview custom canvas used in cad application. i've reimplemented qgraphicsview::wheelevent check keyboard modifiers control key and, if control key pressed, zoom. i'm trying implement horizontal scroll when user holds shift , uses wheel. the problem i'm having horizontal scrolling always scrolls 0.279. not huge problem, hugely annoying , points else being wrong. so, here questions: is right way implement horizontal scrolling? if not, is? how eliminate delta of 0.279? thanks in advance. code , sample output below void myview::zoom(int delta) { double factor = pow(1.2, delta/abs(delta)); this->scale(factor, factor); } void myview::scrollhorizontal(int level) { qpointf center = maptoscene(viewport()->rect().center()); qdebug() << "center: " << center.x() << ", " << center.y(); centeron(qpointf(center.x() - level, center.y())); } void myview::wheelevent(qwheeleve...
Read more