With this filter, you can play with complex color operations, such as saturation, brightness, or inversion. This filter uses the ColorMatrix
class to perform the action.
The following code snippet defines this class:
ColorMatrixFilter (matrix)
The parameters present in this code snippet are as follows:
matrix– Array
: A 4x5 matrix describing the color operation to perform using the ColorMatrix
class.Here is an example of using this filter:
/* Add canvas and stage */ var canvas = document.getElementById("canvas"); var stage = new createjs.Stage(canvas); var shape = new createjs.Shape().set({x:100,y:100}); shape.graphics.beginFill("#ff0000").drawCircle(0,0,50); var matrix = new createjs.ColorMatrix().adjustHue(180).adjustSaturation(100); shape.filters = [ new createjs.ColorMatrixFilter(matrix) ]; shape.cache(-50, -50, 100, 100); /* add shape to stage and update */ stage.addChild(shape); stage.update();
In the preceeding example, we created a red circle and then inverted the hue and changed the saturation to 100. We started by creating the stage
class in the first line. Then, we created a circle using the drawCircle
function. To place the circle in the viewport of the canvas
element, we used the set
function to change the x
and y
values.
Then, we initiated the matrix
variable using the ColorMatrix
class. We used the adjustHue
and adjustSaturation
functions to change the hue and saturation of the circle. An acceptable value for adjustHue
is between -180 to 180. This value for adjustSaturation
is between -100 and 100. We set the hue value to 180 and saturation value to 100 in our example to see the difference better.
We applied all using the filter
property of the shape
variable. Finally, we cached the shape using the cache
method and updated the stage using update
method to apply the changes.
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