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adrianvic 2023-12-21 14:33:34 -03:00
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Controls/Paint/Tools/Brush.js Normal file
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////////////////////////////////////////////////////////////
//// © Microsoft. All rights reserved. ////
////////////////////////////////////////////////////////////
(function (AppNS) {
'use strict';
// The Brush tool simulates a PaintBrush, with color blending and paint loss over distance.
var Brush = WinJS.Class.define(
// Constructor
function () {
this.blends = false; // Sets whether or not this brush blends with underlying color
this.fade = 1000; // How quickly the brush fades, in pixels (0 = no fade)
this.numBristles = 0; // Number of bristles on each side of the brush.
this.bristles = []; // All of the Brush Bristles
this.pxPerBristle = 3; // The width of each bristle
this.maxA = 1.0; // Maximum beginning opacity
this.minA = 0.8; // Minimum beginning opacity
this.autoWidth = false; // Whether or not width is based on path touch-box data or manual width value
this._width = 0;
this.width = 20;
},
// Variables and Methods
{
// The width of the brush, to be approximated using bristles
width: {
get: function () {
return this._width;
},
set: function (w) {
this.numBristles = Math.floor(0.3 * w / this.pxPerBristle);
if (this.numBristles <= 0) {
this.numBristles = 0;
}
this._width = (2 * this.numBristles + 1) * this.pxPerBristle;
}
},
// Begins rendering the beginning of the path
renderStart: function (path, painter) {
var ctx = painter.canvas.context;
ctx.shadowOffsetX = 0;
ctx.shadowOffsetY = 0;
ctx.shadowBlur = 0;
ctx.globalCompositeOperation = "source-over";
ctx.globalAlpha = 1.0;
var startColor = painter.color.copy();
startColor.alpha = this.maxA;
ctx.fillStyle = startColor.toString();
for (var i = -this.numBristles; i <= this.numBristles; i++) {
this.bristles[i] = new AppNS.Painter.Tools.Bristle();
this.bristles[i].color.fromColor(startColor);
this.bristles[i].width = this.pxPerBristle + 0.5;
}
},
// Renders the given path using the current Marker style
render: function (path, painter) {
var ctx = painter.canvas.context;
// If just starting the path, draw semicircle
if (path.starting) {
path.calculateStartCurve(this.width / 2, this.width / 2, 3, this.width);
ctx.beginPath();
ctx.moveTo(path.pStart.x, path.pStart.y);
ctx.bezierCurveTo(path.cpStart.x, path.cpStart.y, path.cpEnd.x, path.cpEnd.y, path.pEnd.x, path.pEnd.y);
ctx.closePath();
ctx.fill();
}
if (path.drawable) {
// Colors
var blendColor = new AppNS.Painter.Graphics.Color();
var oldColor = new AppNS.Painter.Graphics.Color();
// Draw each simulated bristle as a bezier curve
for (var i = -this.numBristles; i <= this.numBristles; i++) {
// The color at the beginning of the stroke segment
oldColor.fromColor(this.bristles[i].color);
var offsetStart = i * this.pxPerBristle;
var offsetEnd = i * this.pxPerBristle;
path.calculateBezier(offsetStart, offsetEnd, Math.pow(oldColor.alpha, 2) * 0.25);
// Blend bristle's color with canvas color
if (this.blends) {
painter.canvas.getColorAt(blendColor, path.cpStart.x, path.cpStart.y);
this.bristles[i].color.blendWith(blendColor);
}
// Update opacity
var currA = this.bristles[i].color.alpha;
var perturb = 0;
if (this.fade) { // Cause the brush to lose ink over distance
perturb = Math.random() * -(Math.pow(0.2 * i / (this.numBristles + 1), 4) + path.dist / this.fade);
currA = currA + perturb;
} else { // Cause the brush to randomly gain or lose ink per bristle, within minA and maxA
currA = Math.random() * (this.maxA - this.minA) + this.minA;
}
this.bristles[i].color.alpha = this.bristles[i].color.clipAlpha(currA);
this.bristles[i].width = this.pxPerBristle + Math.pow(oldColor.alpha, 2) * 0.5;
// Create a linear gradient from the start of the stoke segment to the end,
// giving a smooth transition of color.
var gradient = ctx.createLinearGradient(path.pStart.x, path.pStart.y, path.pEnd.x, path.pEnd.y);
gradient.addColorStop(0, oldColor.toString());
gradient.addColorStop(1, this.bristles[i].color.toString());
ctx.beginPath();
ctx.moveTo(path.pStart.x, path.pStart.y);
ctx.bezierCurveTo(path.cpStart.x, path.cpStart.y, path.cpEnd.x, path.cpEnd.y, path.pEnd.x, path.pEnd.y);
ctx.lineWidth = this.bristles[i].width;
ctx.strokeStyle = gradient;
ctx.stroke();
}
}
},
// Stops the path with the current style
renderStop: function (path, painter) {
var ctx = painter.canvas.context;
if (path.created || path.starting) {
painter.canvas.drawCircle(path.p3.x, path.p3.y, this.width / 2);
} else {
// Colors
var blendColor = new AppNS.Painter.Graphics.Color();
var oldColor = new AppNS.Painter.Graphics.Color();
// Draw each simulated bristle as a bezier curve
for (var i = -this.numBristles; i <= this.numBristles; i++) {
var offsetStart = i * this.pxPerBristle;
var offsetEnd = i * this.pxPerBristle;
path.calculateEndBezier(offsetStart, offsetEnd, 20);
// The color at the beginning of the stroke segment
oldColor.fromColor(this.bristles[i].color);
// Blend bristle's color with canvas color
if (this.blends) {
painter.canvas.getColorAt(blendColor, path.cpStart.x, path.cpStart.y);
this.bristles[i].color.blendWith(blendColor);
}
// Update opacity
this.bristles[i].color.alpha = 0;
// Create a linear gradient from the start of the stoke segment to the end,
// giving a smooth transition of color.
var gradient = ctx.createLinearGradient(path.pStart.x, path.pStart.y, path.pEnd.x, path.pEnd.y);
gradient.addColorStop(0, oldColor.toString());
gradient.addColorStop(1, this.bristles[i].color.toString());
ctx.beginPath();
ctx.moveTo(path.pStart.x, path.pStart.y);
ctx.bezierCurveTo(path.cpStart.x, path.cpStart.y, path.cpEnd.x, path.cpEnd.y, path.pEnd.x, path.pEnd.y);
ctx.lineWidth = this.bristles[i].width;
ctx.strokeStyle = gradient;
ctx.stroke();
}
}
}
}
);
WinJS.Namespace.defineWithParent(AppNS, "Painter.Tools", {
Brush: Brush
});
})(Microsoft.Paint);