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/* <copyright>
This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
(c) Copyright 2011 Motorola Mobility, Inc. All Rights Reserved.
</copyright> */
////////////////////////////////////////////////////////////////////////
//
var Montage = require("montage/core/core").Montage,
Component = require("montage/ui/component").Component;
////////////////////////////////////////////////////////////////////////
//Exporting as ColorBar
exports.ColorBar = Montage.create(Component, {
////////////////////////////////////////////////////////////////////
//No reel needed since it's just a bar component
hasTemplate: {
value: true
},
////////////////////////////////////////////////////////////////////
//Width of spectrum (not including b/w buttons)
_colorBarSpectrumWidth: {
value: null
},
////////////////////////////////////////////////////////////////////
//Width of spectrum steps (used to calculate size of B/W buttons)
_colorBarSpectrumWidthSteps: {
value: 10
},
////////////////////////////////////////////////////////////////////
//Default value
_value: {
value: {h: 0, s: 0, v: 0}
},
////////////////////////////////////////////////////////////////////
//HSV Value selected from bar
value: {
get: function() {return this._value;},
set: function(value) {
if (value) {
//Checking for limits (Max and Min HSV values)
if (value.h > Math.PI*2) {
value.h = Math.PI*2;
} else if (value.h < 0) {
value.h = 0;
}
//
if (value.s > 1) {
value.s = 1;
} else if (value.s < 0) {
value.s = 0;
}
//
if (value.v > 1) {
value.v = 1;
} else if (value.v < 0) {
value.v = 0;
}
//Setting value
this._value = value;
//
if (!this._isMouseDown) {
this._dispatchActionEvent('change', true);
}
}
}
},
////////////////////////////////////////////////////////////////////
//
prepareForDraw: {
value: function() {
//Nothing
}
},
////////////////////////////////////////////////////////////////////
//Setting up and drawing canvas to object
willDraw: {
value: function() {
//Setting the width and height of the canvas to match container
this.element.width = parseInt(window.getComputedStyle(this.element, null).width);
this.element.height = parseInt(window.getComputedStyle(this.element, null).height);
}
},
////////////////////////////////////////////////////////////////////
//
draw: {
value: function () {
//Local variables
var cb_canvas = this.element, cb_ctx, cb_grdnt, cb_slc, cb_gwidth, PI = Math.PI, i;
//calculating width of spectrum (remainder is used for B/W buttons)
cb_gwidth = Math.round(cb_canvas.width - cb_canvas.width/this._colorBarSpectrumWidthSteps);
//Context and Gradient
cb_ctx = cb_canvas.getContext('2d');
cb_grdnt = cb_ctx.createLinearGradient(0, cb_canvas.height, cb_gwidth, cb_canvas.height);
////////////////////////////////////////////////////////
//Looping through set intervals (Creating spectrum)
for (i=0; i<60; i++) {
//Calculating slice number
cb_slc = Math.round(255*i/60);
//Creating gradient slices (6 colors in color theory)
cb_grdnt.addColorStop(i/360, 'rgb(255, '+cb_slc+', 0)');
cb_grdnt.addColorStop((i+60)/360, 'rgb('+(255-cb_slc)+', 255, 0)');
cb_grdnt.addColorStop((i+120)/360, 'rgb(0, 255, '+cb_slc+')');
cb_grdnt.addColorStop((i+180)/360, 'rgb(0, '+(255-cb_slc)+', 255)');
cb_grdnt.addColorStop((i+240)/360, 'rgb('+cb_slc+', 0, 255)');
cb_grdnt.addColorStop((i+300)/360, 'rgb(255, 0,'+(255-cb_slc)+')');
}
//Adding Color Bar to the canvas (Gradients)
cb_ctx.fillStyle = cb_grdnt;
cb_ctx.fillRect(0, 0, cb_gwidth, cb_canvas.height);
////////////////////////////////////////////////////////
//White Gradient overlay to simulate L
cb_grdnt = cb_ctx.createLinearGradient(0, 0, 0, cb_canvas.height);
cb_grdnt.addColorStop(0.0, 'rgba(255, 255, 255, 1)');
cb_grdnt.addColorStop(0.5, 'rgba(255, 255, 255, 0)');
cb_ctx.fillStyle = cb_grdnt;
cb_ctx.fillRect(0, 0, cb_gwidth, cb_canvas.height);
//Black Gradient overlay to simulate S
cb_grdnt = cb_ctx.createLinearGradient(0,0,0,cb_canvas.height);
cb_grdnt.addColorStop(0.5, 'rgba(0, 0, 0, 0)');
cb_grdnt.addColorStop(1.0, 'rgba(0, 0, 0, 1)');
cb_ctx.fillStyle = cb_grdnt;
cb_ctx.fillRect(0, 0, cb_gwidth, cb_canvas.height);
//Black "button"
cb_ctx.fillStyle = "#000";
cb_ctx.fillRect(cb_gwidth, cb_canvas.height/2, cb_gwidth, cb_canvas.height/2);
//Black line divider
cb_ctx.fillStyle = "#000";
cb_ctx.fillRect(cb_gwidth-1, 0, cb_gwidth+1, cb_canvas.height);
//White "button"
cb_ctx.fillStyle = "#FFF";
cb_ctx.fillRect(cb_gwidth, 0, cb_gwidth, cb_canvas.height/2);
//Saving
cb_ctx.restore();
cb_ctx.save();
//Cleaning up
cb_canvas = cb_ctx = cb_grdnt = cb_slc = cb_gwidth = PI = i = null;
}
},
////////////////////////////////////////////////////////////////////
//Adding ColorBar to the element
didDraw: {
value: function() {
//Adding functionality via events
this.element.addEventListener("mousedown", this, false);
this.element.addEventListener("mouseover", this, false);
this.element.addEventListener("mousemove", this, false);
}
},
////////////////////////////////////////////////////////////////////
//Mouse Down (adds other events and updates HSV)
handleMousedown: {
value: function (e) {
if (!this._colorBarSpectrumWidth)
this._colorBarSpectrumWidth = (this.element.width - this.element.width/this._colorBarSpectrumWidthSteps)-1;
this._isMouseDown = true;
document.addEventListener("mouseup", this, false);
this._updateHsv(e);
}
},
////////////////////////////////////////////////////////////////////
//Used to check mouse mode and display cursor
_isMouseDown: {
value: false
},
////////////////////////////////////////////////////////////////////
//Mouse Move (updates HSV)
handleMousemove: {
value: function (e) {
//Changing cursors style for appropiate user feedback
if (e.offsetX > this._colorBarSpectrumWidth) {this.element.style.cursor = 'pointer';}
else {this.element.style.cursor = 'crosshair';}
//Checking for mouse down to scan for color
if (this._isMouseDown) {this._updateHsv(e);}
}
},
////////////////////////////////////////////////////////////////////
//Mouse Up (Removes events)
handleMouseup: {
value: function (e) {
this._isMouseDown = false;
document.removeEventListener("mouseup", this, false);
this._dispatchActionEvent('change', false);
}
},
////////////////////////////////////////////////////////////////////
//Updating HSV values
_updateHsv: {
value: function (e) {
if (e.offsetX > this._colorBarSpectrumWidth) {
//Faking button functionality - Simple B/W selection
if (e.offsetY >= this.element.offsetHeight/2) { this.value = {h: this.value.h, s: 1, v: 0};} // White
else { this.value = {h: this.value.h, s: 0, v: 1};} // Black
} else {
//Checking for S or V to be applied (no mixing on bar)
if (e.offsetY >= this.element.offsetHeight/2) { //Saturation
this.value = {h: e.offsetX/this._colorBarSpectrumWidth*Math.PI*2, v: 1-(e.offsetY-this.element.offsetHeight/2)/((this.element.offsetHeight/2-1)), s: 1};
} else { //Vibrance
this.value = {h: e.offsetX/this._colorBarSpectrumWidth*Math.PI*2, v: 1, s: (e.offsetY)/((this.element.offsetHeight/2))};
}
}
//
this._dispatchActionEvent('changing', false);
}
},
////////////////////////////////////////////////////////////////////
//Dispatching "Change" event
_dispatchActionEvent: {
value: function(type, userInitiated) {
var actionEvent = document.createEvent("CustomEvent");
actionEvent.initEvent(type, true, true);
actionEvent.type = type;
actionEvent.wasSetByCode = userInitiated;
actionEvent.hsv = this.value;
this.dispatchEvent(actionEvent);
}
}
////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////
});
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