phaser/src/gameobjects/shape/curve/CurveCanvasRenderer.js

A fast, free and fun HTML5 Game Framework for Desktop and Mobile web browsers from the team at Phaser Studio Inc.

/**
 * @author       Richard Davey <rich@phaser.io>
 * @copyright    2013-2025 Phaser Studio Inc.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */

var FillStyleCanvas = require('../FillStyleCanvas');
var LineStyleCanvas = require('../LineStyleCanvas');
var SetTransform = require('../../../renderer/canvas/utils/SetTransform');

/**
 * Renders this Game Object with the Canvas Renderer to the given Camera.
 * The object will not render if any of its renderFlags are set or it is being actively filtered out by the Camera.
 * This method should not be called directly. It is a utility function of the Render module.
 *
 * @method Phaser.GameObjects.Curve#renderCanvas
 * @since 3.13.0
 * @private
 *
 * @param {Phaser.Renderer.Canvas.CanvasRenderer} renderer - A reference to the current active Canvas renderer.
 * @param {Phaser.GameObjects.Curve} src - The Game Object being rendered in this call.
 * @param {Phaser.Cameras.Scene2D.Camera} camera - The Camera that is rendering the Game Object.
 * @param {Phaser.GameObjects.Components.TransformMatrix} parentMatrix - This transform matrix is defined if the game object is nested
 */
var CurveCanvasRenderer = function (renderer, src, camera, parentMatrix)
{
    camera.addToRenderList(src);

    var ctx = renderer.currentContext;

    if (SetTransform(renderer, ctx, src, camera, parentMatrix))
    {
        var dx = src._displayOriginX + src._curveBounds.x;
        var dy = src._displayOriginY + src._curveBounds.y;

        var path = src.pathData;
        var pathLength = path.length - 1;

        var px1 = path[0] - dx;
        var py1 = path[1] - dy;

        ctx.beginPath();

        ctx.moveTo(px1, py1);

        if (!src.closePath)
        {
            pathLength -= 2;
        }

        for (var i = 2; i < pathLength; i += 2)
        {
            var px2 = path[i] - dx;
            var py2 = path[i + 1] - dy;

            ctx.lineTo(px2, py2);
        }

        if (src.closePath)
        {
            ctx.closePath();
        }

        if (src.isFilled)
        {
            FillStyleCanvas(ctx, src);

            ctx.fill();
        }

        if (src.isStroked)
        {
            LineStyleCanvas(ctx, src);

            ctx.stroke();
        }

        //  Restore the context saved in SetTransform
        ctx.restore();
    }
};

module.exports = CurveCanvasRenderer;