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adrianvic 2023-12-21 14:33:34 -03:00
commit 59426d62fb
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Controls/Paint/Tools/Crayon.js Normal file
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////////////////////////////////////////////////////////////
//// © Microsoft. All rights reserved. ////
////////////////////////////////////////////////////////////
(function (AppNS) {
'use strict';
// The crayon tool uses textures to generate a crayon/pencil/chalk like effect
var Crayon = WinJS.Class.define(
// Constructor
function () {
this._density = 0.5; // The default density is 50% color
this._color = new AppNS.Painter.Graphics.Color(0,0,0,255);
this.autoWidth = false; // Whether or not width is based on path touch-box data or manual width value
this.width = 30; // The default line manual width
this.texture = null;
},
// Variables and Methods
{
density: {
get: function () {
return this._density;
},
set: function (d) {
this._density = d;
if (this.texture) {
this.texture.update(this._color, this._density);
}
}
},
// Starts rendering the given path using the current style
renderStart: function (path, painter) {
var ctx = painter.canvas.context;
ctx.fillStyle = this.texture.texturePattern;
ctx.shadowOffsetX = 0;
ctx.shadowOffsetY = 0;
ctx.shadowBlur = 0;
ctx.globalCompositeOperation = "source-over";
ctx.globalAlpha = 1.0;
},
// Renders the given path using the current style
render: function (path, painter) {
var ctx = painter.canvas.context;
// Get start and end widths for the stroke part
var wStart = this.width;
var wEnd = this.width;
if (this.autoWidth){
path.calculateWidth();
wStart = path.wStart;
wEnd = path.wEnd;
}
// If just starting the path, draw semicircle
if (path.starting) {
path.calculateStartCurve(wEnd / 2, wEnd / 2, 3, wEnd);
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();
this.fillCrayon(ctx);
}
if (path.drawable) {
// Start at first point of shape, then bezier to second
ctx.beginPath();
path.calculateBezier(wStart / 2, wEnd / 2);
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);
// Line to third point of shape, then bezier to fourth, then close the path
path.calculateBezier(-1 * wStart / 2, -1 * wEnd / 2);
ctx.lineTo(path.pEnd.x, path.pEnd.y);
ctx.bezierCurveTo(path.cpEnd.x, path.cpEnd.y, path.cpStart.x, path.cpStart.y, path.pStart.x, path.pStart.y);
ctx.closePath();
// Set fill Style and fill shape
this.fillCrayon(ctx);
}
},
// Renders the end of the path with the current style
renderStop: function (path, painter) {
var ctx = painter.canvas.context;
// Get start and end widths for the stroke part
var wStart = this.width;
var wEnd = this.width;
if (this.autoWidth){
path.calculateWidth();
wStart = path.wStart;
wEnd = path.wEnd;
}
// If haven't drawn starting effect yet
if (path.created || path.starting) {
ctx.beginPath();
ctx.arc(path.p3.x, path.p3.y, wEnd / 2, 0, Math.PI * 2, true);
ctx.closePath();
this.fillCrayon(ctx);
} else { // Otherwise, draw a curve to end the path
path.calculateStopCurve(wEnd / 2, wEnd / 2, 3, wEnd);
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();
this.fillCrayon(ctx);
}
},
fillCrayon: function (ctx) {
// Set fill Style and fill shape
ctx.fillStyle = this.texturePattern;
ctx.save();
var rand = Math.random();
ctx.rotate(rand * 2 * Math.PI);
ctx.translate(rand * 10, rand * 10);
ctx.fill();
ctx.restore();
},
update: function (painter) {
this._color = painter.color.copy();
if (this.texture) {
this.texture.update(this._color, this._density);
}
},
setTexture: function (textureImage) {
this.texture = new AppNS.Painter.Graphics.Texture(textureImage);
this.texture.update(this._color, this._density);
}
}
);
WinJS.Namespace.defineWithParent(AppNS, "Painter.Tools", {
Crayon: Crayon
});
})(Microsoft.Paint);