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225 lines
6.9 KiB
225 lines
6.9 KiB
/**
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* Canvas shapes used by Network
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*/
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if (typeof CanvasRenderingContext2D !== 'undefined') {
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/**
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* Draw a circle shape
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*/
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CanvasRenderingContext2D.prototype.circle = function(x, y, r) {
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this.beginPath();
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this.arc(x, y, r, 0, 2*Math.PI, false);
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};
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/**
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* Draw a square shape
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* @param {Number} x horizontal center
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* @param {Number} y vertical center
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* @param {Number} r size, width and height of the square
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*/
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CanvasRenderingContext2D.prototype.square = function(x, y, r) {
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this.beginPath();
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this.rect(x - r, y - r, r * 2, r * 2);
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};
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/**
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* Draw a triangle shape
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* @param {Number} x horizontal center
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* @param {Number} y vertical center
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* @param {Number} r radius, half the length of the sides of the triangle
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*/
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CanvasRenderingContext2D.prototype.triangle = function(x, y, r) {
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// http://en.wikipedia.org/wiki/Equilateral_triangle
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this.beginPath();
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var s = r * 2;
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var s2 = s / 2;
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var ir = Math.sqrt(3) / 6 * s; // radius of inner circle
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var h = Math.sqrt(s * s - s2 * s2); // height
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this.moveTo(x, y - (h - ir));
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this.lineTo(x + s2, y + ir);
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this.lineTo(x - s2, y + ir);
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this.lineTo(x, y - (h - ir));
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this.closePath();
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};
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/**
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* Draw a triangle shape in downward orientation
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* @param {Number} x horizontal center
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* @param {Number} y vertical center
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* @param {Number} r radius
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*/
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CanvasRenderingContext2D.prototype.triangleDown = function(x, y, r) {
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// http://en.wikipedia.org/wiki/Equilateral_triangle
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this.beginPath();
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var s = r * 2;
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var s2 = s / 2;
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var ir = Math.sqrt(3) / 6 * s; // radius of inner circle
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var h = Math.sqrt(s * s - s2 * s2); // height
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this.moveTo(x, y + (h - ir));
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this.lineTo(x + s2, y - ir);
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this.lineTo(x - s2, y - ir);
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this.lineTo(x, y + (h - ir));
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this.closePath();
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};
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/**
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* Draw a star shape, a star with 5 points
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* @param {Number} x horizontal center
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* @param {Number} y vertical center
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* @param {Number} r radius, half the length of the sides of the triangle
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*/
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CanvasRenderingContext2D.prototype.star = function(x, y, r) {
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// http://www.html5canvastutorials.com/labs/html5-canvas-star-spinner/
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this.beginPath();
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for (var n = 0; n < 10; n++) {
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var radius = (n % 2 === 0) ? r * 1.3 : r * 0.5;
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this.lineTo(
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x + radius * Math.sin(n * 2 * Math.PI / 10),
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y - radius * Math.cos(n * 2 * Math.PI / 10)
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);
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}
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this.closePath();
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};
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/**
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* http://stackoverflow.com/questions/1255512/how-to-draw-a-rounded-rectangle-on-html-canvas
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*/
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CanvasRenderingContext2D.prototype.roundRect = function(x, y, w, h, r) {
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var r2d = Math.PI/180;
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if( w - ( 2 * r ) < 0 ) { r = ( w / 2 ); } //ensure that the radius isn't too large for x
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if( h - ( 2 * r ) < 0 ) { r = ( h / 2 ); } //ensure that the radius isn't too large for y
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this.beginPath();
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this.moveTo(x+r,y);
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this.lineTo(x+w-r,y);
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this.arc(x+w-r,y+r,r,r2d*270,r2d*360,false);
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this.lineTo(x+w,y+h-r);
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this.arc(x+w-r,y+h-r,r,0,r2d*90,false);
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this.lineTo(x+r,y+h);
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this.arc(x+r,y+h-r,r,r2d*90,r2d*180,false);
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this.lineTo(x,y+r);
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this.arc(x+r,y+r,r,r2d*180,r2d*270,false);
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};
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/**
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* http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
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*/
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CanvasRenderingContext2D.prototype.ellipse = function(x, y, w, h) {
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var kappa = .5522848,
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ox = (w / 2) * kappa, // control point offset horizontal
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oy = (h / 2) * kappa, // control point offset vertical
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xe = x + w, // x-end
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ye = y + h, // y-end
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xm = x + w / 2, // x-middle
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ym = y + h / 2; // y-middle
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this.beginPath();
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this.moveTo(x, ym);
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this.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
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this.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
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this.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
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this.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
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};
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/**
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* http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas
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*/
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CanvasRenderingContext2D.prototype.database = function(x, y, w, h) {
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var f = 1/3;
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var wEllipse = w;
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var hEllipse = h * f;
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var kappa = .5522848,
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ox = (wEllipse / 2) * kappa, // control point offset horizontal
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oy = (hEllipse / 2) * kappa, // control point offset vertical
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xe = x + wEllipse, // x-end
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ye = y + hEllipse, // y-end
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xm = x + wEllipse / 2, // x-middle
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ym = y + hEllipse / 2, // y-middle
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ymb = y + (h - hEllipse/2), // y-midlle, bottom ellipse
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yeb = y + h; // y-end, bottom ellipse
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this.beginPath();
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this.moveTo(xe, ym);
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this.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
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this.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
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this.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
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this.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
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this.lineTo(xe, ymb);
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this.bezierCurveTo(xe, ymb + oy, xm + ox, yeb, xm, yeb);
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this.bezierCurveTo(xm - ox, yeb, x, ymb + oy, x, ymb);
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this.lineTo(x, ym);
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};
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/**
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* Draw an arrow point (no line)
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*/
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CanvasRenderingContext2D.prototype.arrow = function(x, y, angle, length) {
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// tail
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var xt = x - length * Math.cos(angle);
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var yt = y - length * Math.sin(angle);
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// inner tail
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// TODO: allow to customize different shapes
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var xi = x - length * 0.9 * Math.cos(angle);
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var yi = y - length * 0.9 * Math.sin(angle);
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// left
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var xl = xt + length / 3 * Math.cos(angle + 0.5 * Math.PI);
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var yl = yt + length / 3 * Math.sin(angle + 0.5 * Math.PI);
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// right
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var xr = xt + length / 3 * Math.cos(angle - 0.5 * Math.PI);
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var yr = yt + length / 3 * Math.sin(angle - 0.5 * Math.PI);
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this.beginPath();
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this.moveTo(x, y);
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this.lineTo(xl, yl);
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this.lineTo(xi, yi);
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this.lineTo(xr, yr);
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this.closePath();
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};
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/**
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* Sets up the dashedLine functionality for drawing
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* Original code came from http://stackoverflow.com/questions/4576724/dotted-stroke-in-canvas
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* @author David Jordan
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* @date 2012-08-08
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*/
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CanvasRenderingContext2D.prototype.dashedLine = function(x,y,x2,y2,dashArray){
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if (!dashArray) dashArray = [10, 5];
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if (dashLength == 0) dashLength = 0.001; // Hack for Safari
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var dashCount = dashArray.length;
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this.moveTo(x, y);
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var dx = (x2 - x), dy = (y2 - y);
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var slope = dy / dx;
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var distRemaining = Math.sqrt(dx * dx + dy * dy);
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var dashIndex = 0, draw = true;
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while (distRemaining >= 0.1) {
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var dashLength = dashArray[dashIndex++ % dashCount];
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if (dashLength > distRemaining) dashLength = distRemaining;
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var xStep = Math.sqrt(dashLength * dashLength / (1 + slope * slope));
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if (dx < 0) xStep = -xStep;
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x += xStep;
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y += slope * xStep;
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this[draw ? 'lineTo' : 'moveTo'](x, y);
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distRemaining -= dashLength;
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draw = !draw;
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}
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};
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// TODO: add diamond shape
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}
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