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adrianvic 2023-12-21 14:33:34 -03:00
commit 59426d62fb
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Controls/Paint/Tools/Eraser.js Normal file
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////////////////////////////////////////////////////////////
//// © Microsoft. All rights reserved. ////
////////////////////////////////////////////////////////////
(function (AppNS) {
'use strict';
// The Marker tool is the simplest tool.
// It simply connect users points smoothly with a solid color, usually slightly transparent.
var Eraser = WinJS.Class.define(
// Constructor
function () {
this.autoWidth = false; // Whether or not width is based on path touch-box data or manual width value
this.width = 20; // The default line manual width
},
// Variables and Methods
{
// 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 = "destination-out";
ctx.globalAlpha = 1;
ctx.fillStyle = "rgba(0,0,0,1)";
// Start effect
var x = path.p3.x;
var y = path.p3.y;
painter.canvas.drawCircle(x, y, this.width / 2);
},
// Renders the given path using the current Marker style
render: function (path, painter) {
if (path.drawable) {
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;
}
// Start at first point of shape, then bezier to second
ctx.beginPath();
path.calculateBezier(wStart / 2, wEnd / 2, 0.5);
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, 0.5);
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();
ctx.fill();
}
},
// Begins rendering the beginning of the path
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;
}
// Start at first point of shape, then bezier to second
ctx.beginPath();
path.calculateEndBezier(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.calculateEndBezier(-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();
ctx.fill();
painter.canvas.drawCircle(path.p3.x, path.p3.y, this.width / 2);
},
}
);
WinJS.Namespace.defineWithParent(AppNS, "Painter.Tools", {
Eraser: Eraser
});
})(Microsoft.Paint);