#

API Docs for: 2.0.0
Show: Inherited Protected Private Deprecated

# File: src/pixi/renderers/canvas/CanvasGraphics.js

    /**
     * @author Mat Groves http://matgroves.com/ @Doormat23
     */

    /**
     * A set of functions used by the canvas renderer to draw the primitive graphics data.
     *
     * @class CanvasGraphics
     * @static
     */
    PIXI.CanvasGraphics = function()
    {
    };

    /*
     * Renders a PIXI.Graphics object to a canvas.
     *
     * @method renderGraphics
     * @static
     * @param graphics {Graphics} the actual graphics object to render
     * @param context {CanvasRenderingContext2D} the 2d drawing method of the canvas
     */
    PIXI.CanvasGraphics.renderGraphics = function(graphics, context)
    {
        var worldAlpha = graphics.worldAlpha;
        var color = '';

        for (var i = 0; i < graphics.graphicsData.length; i++)
        {
            var data = graphics.graphicsData[i];
            var shape = data.shape;

            context.strokeStyle = color = '#' + ('00000' + ( data.lineColor | 0).toString(16)).substr(-6);

            context.lineWidth = data.lineWidth;

            if(data.type === PIXI.Graphics.POLY)
            {
                context.beginPath();

                var points = shape.points;

                context.moveTo(points[0], points[1]);

                for (var j=1; j < points.length/2; j++)
                {
                    context.lineTo(points[j * 2], points[j * 2 + 1]);
                }

                if(shape.closed)
                {
                    context.lineTo(points[0], points[1]);
                }

                // if the first and last point are the same close the path - much neater :)
                if(points[0] === points[points.length-2] && points[1] === points[points.length-1])
                {
                    context.closePath();
                }

                if(data.fill)
                {
                    context.globalAlpha = data.fillAlpha * worldAlpha;
                    context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
                    context.fill();
                }
                if(data.lineWidth)
                {
                    context.globalAlpha = data.lineAlpha * worldAlpha;
                    context.stroke();
                }
            }
            else if(data.type === PIXI.Graphics.RECT)
            {

                if(data.fillColor || data.fillColor === 0)
                {
                    context.globalAlpha = data.fillAlpha * worldAlpha;
                    context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
                    context.fillRect(shape.x, shape.y, shape.width, shape.height);

                }
                if(data.lineWidth)
                {
                    context.globalAlpha = data.lineAlpha * worldAlpha;
                    context.strokeRect(shape.x, shape.y, shape.width, shape.height);
                }
            }
            else if(data.type === PIXI.Graphics.CIRC)
            {
                // TODO - need to be Undefined!
                context.beginPath();
                context.arc(shape.x, shape.y, shape.radius,0,2*Math.PI);
                context.closePath();

                if(data.fill)
                {
                    context.globalAlpha = data.fillAlpha * worldAlpha;
                    context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
                    context.fill();
                }
                if(data.lineWidth)
                {
                    context.globalAlpha = data.lineAlpha * worldAlpha;
                    context.stroke();
                }
            }
            else if(data.type === PIXI.Graphics.ELIP)
            {
                // ellipse code taken from: http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas

                var w = shape.width * 2;
                var h = shape.height * 2;

                var x = shape.x - w/2;
                var y = shape.y - h/2;

                context.beginPath();

                var kappa = 0.5522848,
                    ox = (w / 2) * kappa, // control point offset horizontal
                    oy = (h / 2) * kappa, // control point offset vertical
                    xe = x + w,           // x-end
                    ye = y + h,           // y-end
                    xm = x + w / 2,       // x-middle
                    ym = y + h / 2;       // y-middle

                context.moveTo(x, ym);
                context.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
                context.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
                context.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
                context.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);

                context.closePath();

                if(data.fill)
                {
                    context.globalAlpha = data.fillAlpha * worldAlpha;
                    context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
                    context.fill();
                }
                if(data.lineWidth)
                {
                    context.globalAlpha = data.lineAlpha * worldAlpha;
                    context.stroke();
                }
            }
            else if (data.type === PIXI.Graphics.RREC)
            {
                var pts = shape.points;
                var rx = pts[0];
                var ry = pts[1];
                var width = pts[2];
                var height = pts[3];
                var radius = pts[4];

                var maxRadius = Math.min(width, height) / 2 | 0;
                radius = radius > maxRadius ? maxRadius : radius;

                context.beginPath();
                context.moveTo(rx, ry + radius);
                context.lineTo(rx, ry + height - radius);
                context.quadraticCurveTo(rx, ry + height, rx + radius, ry + height);
                context.lineTo(rx + width - radius, ry + height);
                context.quadraticCurveTo(rx + width, ry + height, rx + width, ry + height - radius);
                context.lineTo(rx + width, ry + radius);
                context.quadraticCurveTo(rx + width, ry, rx + width - radius, ry);
                context.lineTo(rx + radius, ry);
                context.quadraticCurveTo(rx, ry, rx, ry + radius);
                context.closePath();

                if(data.fillColor || data.fillColor === 0)
                {
                    context.globalAlpha = data.fillAlpha * worldAlpha;
                    context.fillStyle = color = '#' + ('00000' + ( data.fillColor | 0).toString(16)).substr(-6);
                    context.fill();

                }
                if(data.lineWidth)
                {
                    context.globalAlpha = data.lineAlpha * worldAlpha;
                    context.stroke();
                }
            }
        }
    };

    /*
     * Renders a graphics mask
     *
     * @static
     * @private
     * @method renderGraphicsMask
     * @param graphics {Graphics} the graphics which will be used as a mask
     * @param context {CanvasRenderingContext2D} the context 2d method of the canvas
     */
    PIXI.CanvasGraphics.renderGraphicsMask = function(graphics, context)
    {
        var len = graphics.graphicsData.length;

        if(len === 0) return;

        if(len > 1)
        {
            len = 1;
            window.console.log('Pixi.js warning: masks in canvas can only mask using the first path in the graphics object');
        }

        for (var i = 0; i < 1; i++)
        {
            var data = graphics.graphicsData[i];
            var shape = data.shape;

            if(data.type === PIXI.Graphics.POLY)
            {
                context.beginPath();

                var points = shape.points;

                context.moveTo(points[0], points[1]);

                for (var j=1; j < points.length/2; j++)
                {
                    context.lineTo(points[j * 2], points[j * 2 + 1]);
                }

                // if the first and last point are the same close the path - much neater :)
                if(points[0] === points[points.length-2] && points[1] === points[points.length-1])
                {
                    context.closePath();
                }

            }
            else if(data.type === PIXI.Graphics.RECT)
            {
                context.beginPath();
                context.rect(shape.x, shape.y, shape.width, shape.height);
                context.closePath();
            }
            else if(data.type === PIXI.Graphics.CIRC)
            {
                // TODO - need to be Undefined!
                context.beginPath();
                context.arc(shape.x, shape.y, shape.radius,0,2*Math.PI);
                context.closePath();
            }
            else if(data.type === PIXI.Graphics.ELIP)
            {

                // ellipse code taken from: http://stackoverflow.com/questions/2172798/how-to-draw-an-oval-in-html5-canvas

                var w = shape.width * 2;
                var h = shape.height * 2;

                var x = shape.x - w/2;
                var y = shape.y - h/2;

                context.beginPath();

                var kappa = 0.5522848,
                    ox = (w / 2) * kappa, // control point offset horizontal
                    oy = (h / 2) * kappa, // control point offset vertical
                    xe = x + w,           // x-end
                    ye = y + h,           // y-end
                    xm = x + w / 2,       // x-middle
                    ym = y + h / 2;       // y-middle

                context.moveTo(x, ym);
                context.bezierCurveTo(x, ym - oy, xm - ox, y, xm, y);
                context.bezierCurveTo(xm + ox, y, xe, ym - oy, xe, ym);
                context.bezierCurveTo(xe, ym + oy, xm + ox, ye, xm, ye);
                context.bezierCurveTo(xm - ox, ye, x, ym + oy, x, ym);
                context.closePath();
            }
            else if (data.type === PIXI.Graphics.RREC)
            {

                var pts = shape.points;
                var rx = pts[0];
                var ry = pts[1];
                var width = pts[2];
                var height = pts[3];
                var radius = pts[4];

                var maxRadius = Math.min(width, height) / 2 | 0;
                radius = radius > maxRadius ? maxRadius : radius;

                context.beginPath();
                context.moveTo(rx, ry + radius);
                context.lineTo(rx, ry + height - radius);
                context.quadraticCurveTo(rx, ry + height, rx + radius, ry + height);
                context.lineTo(rx + width - radius, ry + height);
                context.quadraticCurveTo(rx + width, ry + height, rx + width, ry + height - radius);
                context.lineTo(rx + width, ry + radius);
                context.quadraticCurveTo(rx + width, ry, rx + width - radius, ry);
                context.lineTo(rx + radius, ry);
                context.quadraticCurveTo(rx, ry, rx, ry + radius);
                context.closePath();
            }
        }
    };