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前端开发屏幕解锁功能

2019-01-02 21:38:00 分类：教程 阅读(405) 评论(0)
ios 安卓 前端开发
安卓开发转前端还是大数据库
ios与安卓前端界面开发的区别吗

html 代码片段

    <head>
        <meta charset=”utf-8″ />
        <title>图案解锁</title>
    </head>
    <body></body>
    <script>
        var CANVAS_WIDTH = 310
        var CANVAS_HEIGHT = 520
        var OUTER_RADIUS = 35
        var INNER_RADIUS = 10
        var OUTER_STROKE_COLOR_NORMAL = ‘rgba(63, 164, 223, 0.7)’
        var OUTER_FILL_COLOR_NORMAL = ‘rgba(94, 211, 229, 0.7)’
        var INNER_STROKE_COLOR_NORMAL = ‘rgba(84, 169, 228, 0.7)’
        var INNER_FILL_COLOR_NORMAL = ‘rgba(71, 167, 215, 0.7)’
        var OUTER_STROKE_COLOR_TOUCH = ‘rgba(109, 222, 92, 0.7)’
        var OUTER_FILL_COLOR_TOUCH = ‘rgba(172, 236, 162, 0.7)’
        var INNER_STROKE_COLOR_TOUCH = ‘rgba(83, 209, 102, 0.7)’
        var INNER_FILL_COLOR_TOUCH = ‘rgba(113, 217, 129, 0.7)’
        var OUTER_STROKE_COLOR_ERROR = ‘rgba(255, 45, 45, 0.7)’
        var OUTER_FILL_COLOR_ERROR = ‘rgba(255, 81, 81, 0.7)’
        var INNER_STROKE_COLOR_ERROR = ‘rgba(255, 45, 45, 0.7)’
        var INNER_FILL_COLOR_ERROR = ‘rgba(255, 81, 81, 0.7)’
        var LINE_STROKE_COLOR_NORMAL = ‘rgba(109, 222, 92, 0.7)’
        var LINE_STROKE_COLOR_ERROR = ‘rgba(255, 81, 81, 0.7)’
        var CIRCLE_INTERVAL = 30
        var CIRCLE_MARGIN_HORIZONTAL_BORDER =
            (CANVAS_WIDTH – OUTER_RADIUS * 2 * 3 – 2 * CIRCLE_INTERVAL) / 2
        var CIRCLE_MARGIN_VERTICAL_BORDER = 170
        function Circle(x, y, id) {
            this.x = x
            this.y = y
            ;(this.id = id),
                (this.outer_stroke_color = OUTER_STROKE_COLOR_NORMAL)
            this.outer_fill_color = OUTER_FILL_COLOR_NORMAL
            this.inner_stroke_color = INNER_STROKE_COLOR_NORMAL
            this.inner_fill_color = INNER_FILL_COLOR_NORMAL
            ;(this.is_finish = false),
                (this.setColor = function(
                    outer_stroke_color,
                    outer_fill_color,
                    inner_stroke_color,
                    inner_fill_color,
                ) {
                    this.outer_stroke_color = outer_stroke_color
                    this.outer_fill_color = outer_fill_color
                    this.inner_stroke_color = inner_stroke_color
                    this.inner_fill_color = inner_fill_color
                })
            this.checkTouch = function(m_x, m_y) {
                var distance = Math.sqrt(
                    Math.pow(this.x – m_x, 2) + Math.pow(this.y – m_y, 2),
                )
                if (distance < OUTER_RADIUS) {
                    return true
                } else {
                    return false
                }
            }
            this.draw = function(ctx) {
                ctx.save()
                ctx.beginPath()
                ctx.lineWidth = 2
                ctx.strokeStyle = this.outer_stroke_color
                ctx.fillStyle = this.outer_fill_color
                ctx.arc(this.x, this.y, OUTER_RADIUS, 2 * Math.PI, 0, false)
                ctx.closePath()
                ctx.stroke()
                ctx.fill()
                ctx.beginPath()
                ctx.strokeStyle = this.inner_stroke_color
                ctx.fillStyle = this.inner_fill_color
                ctx.arc(this.x, this.y, INNER_RADIUS, 2 * Math.PI, 0, false)
                ctx.closePath()
                ctx.stroke()
                ctx.fill()
                ctx.restore()
            }
        }
        function Line(x, y) {
            this.start_x = x
            this.start_y = y
            this.end_x = x
            this.end_y = y
            this.stroke_color = LINE_STROKE_COLOR_NORMAL
            this.is_finish = false
            this.setEndXY = function(x, y) {
                this.end_x = x
                this.end_y = y
            }
            this.draw = function(ctx) {
                ctx.save()
                ctx.lineWidth = 3
                ctx.lineJoin = ’round’
                ctx.strokeStyle = this.stroke_color
                ctx.beginPath()
                ctx.moveTo(this.start_x, this.start_y)
                ctx.lineTo(this.end_x, this.end_y)
                ctx.closePath()
                ctx.stroke()
                ctx.restore()
            }
        }
        function StatusBar() {
            this.draw = function(ctx) {
                ctx.save()
                ctx.fillStyle = ‘rgba(1, 1, 1, 0.7)’
                ctx.fillRect(0, 0, CANVAS_WIDTH, 25)
                ctx.restore()
            }
        }
        function Tip(x, y) {
            this.x = x
            this.y = y
            this.text = ‘解锁失败，请重试’
            this.draw = function(ctx) {
                ctx.save()
                ctx.font = ’14px 微软雅黑’
                ctx.textAlign = ‘center’
                ctx.textBaseline = ‘top’
                ctx.fillStyle = ‘#FF5151’
                ctx.fillText(this.text, x, y)
                ctx.restore()
            }
        }
        var canvas = document.createElement(‘canvas’)
        canvas.width = CANVAS_WIDTH
        canvas.height = CANVAS_HEIGHT
        canvas.style.display = ‘block’
        canvas.style.margin = ’20px auto’
        canvas.style.backgroundImage =
            “url(‘http://img4.duitang.com/uploads/item/201406/27/20140627004739_nQwxv.jpeg’)”
        canvas.style.backgroundSize =
            CANVAS_WIDTH + ‘px ‘ + CANVAS_HEIGHT + ‘px’
        document.body.appendChild(canvas)
        var ctx = canvas.getContext(‘2d’)
        var is_finish = false
        var is_mouse_down = false
        // 松开鼠标后，启动一个计数器，相当于结果的显示时间，这里为50 * 20 = 1000ms
        var wait_count_total = 50
        var wait_count = 0
        var correct_id_arr = [0, 4, 8, 5, 2, 1, 3, 6, 7] // 正确的序列
        var line_id_arr = [] // 用于存储连接节点的序列
        var statusbar = new StatusBar()
        var tip = new Tip(CANVAS_WIDTH / 2, 120)
        // 初始化连接线和节点圆列表
        var line_list = []
        var circle_list = []
        for (var i = 0; i < 3; i++) {
            for (var j = 0; j < 3; j++) {
                var x =
                    CIRCLE_MARGIN_HORIZONTAL_BORDER +
                    CIRCLE_INTERVAL * j +
                    OUTER_RADIUS * (2 * j + 1)
                var y =
                    CIRCLE_MARGIN_VERTICAL_BORDER +
                    CIRCLE_INTERVAL * i +
                    OUTER_RADIUS * (2 * i + 1)
                circle_list.push(new Circle(x, y, i * 3 + j))
            }
        }
        this.reset = function() {
            tip.text = ‘解锁失败，请重试’
            line_id_arr = []
            line_list = []
            for (var i = 0; i < circle_list.length; i++) {
                circle_list[i].setColor(
                    OUTER_STROKE_COLOR_NORMAL,
                    OUTER_FILL_COLOR_NORMAL,
                    INNER_STROKE_COLOR_NORMAL,
                    INNER_FILL_COLOR_NORMAL,
                )
                circle_list[i].is_finish = false
            }
        }
        this.checkIsCorrect = function() {
            var is_correct = false
            if (correct_id_arr.length == line_id_arr.length) {
                var i
                for (i = 0; i < correct_id_arr.length; i++) {
                    if (correct_id_arr[i] != line_id_arr[i]) {
                        break
                    }
                }
                if (i == correct_id_arr.length) {
                    is_correct = true
                }
            }
            if (!is_correct) {
                // 设置解锁失败时的颜色
                for (var i = 0; i < correct_id_arr.length; i++) {
                    circle_list[i].setColor(
                        OUTER_STROKE_COLOR_ERROR,
                        OUTER_FILL_COLOR_ERROR,
                        INNER_STROKE_COLOR_ERROR,
                        INNER_FILL_COLOR_ERROR,
                    )
                }
                for (var i = 0; i < line_list.length; i++) {
                    line_list[i].stroke_color = LINE_STROKE_COLOR_ERROR
                }
            } else {
                tip.text = ‘解锁成功’
            }
        }
        this.addEventListener(
            ‘mouseup’,
            function(event) {
                if (is_mouse_down) {
                    is_finish = true
                    is_mouse_down = false
                    line_list.pop() // 删除最后一根线
                    checkIsCorrect()
                }
            },
            false,
        )
        this.addEventListener(
            ‘mousedown’,
            function(event) {
                if (is_finish) return
                var start_x = event.pageX – canvas.offsetLeft
                var start_y = event.pageY – canvas.offsetTop
                for (var i = 0; i < circle_list.length; i++) {
                    if (circle_list[i].checkTouch(start_x, start_y)) {
                        line_id_arr.push(circle_list[i].id)
                        circle_list[i].is_finish = true
                        circle_list[i].setColor(
                            OUTER_STROKE_COLOR_TOUCH,
                            OUTER_FILL_COLOR_TOUCH,
                            INNER_STROKE_COLOR_TOUCH,
                            INNER_FILL_COLOR_TOUCH,
                        )
                        is_mouse_down = true
                        line_list.push(
                            new Line(circle_list[i].x, circle_list[i].y),
                        )
                        break
                    }
                }
            },
            false,
        )
        this.addEventListener(
            ‘mousemove’,
            function(event) {
                if (is_mouse_down) {
                    var curr_x = event.pageX – canvas.offsetLeft
                    var curr_y = event.pageY – canvas.offsetTop
                    line_list[line_list.length – 1].setEndXY(curr_x, curr_y)
                    for (var i = 0; i < circle_list.length; i++) {
                        if (
                            false == circle_list[i].is_finish &&
                            circle_list[i].checkTouch(curr_x, curr_y)
                        ) {
                            line_id_arr.push(circle_list[i].id)
                            circle_list[i].is_finish = true
                            circle_list[i].setColor(
                                OUTER_STROKE_COLOR_TOUCH,
                                OUTER_FILL_COLOR_TOUCH,
                                INNER_STROKE_COLOR_TOUCH,
                                INNER_FILL_COLOR_TOUCH,
                            )
                            line_list[line_list.length – 1].is_finish = true
                            line_list[line_list.length – 1].setEndXY(
                                circle_list[i].x,
                                circle_list[i].y,
                            )
                            line_list.push(
                                new Line(circle_list[i].x, circle_list[i].y),
                            )
                        }
                    }
                }
            },
            false,
        )
        // 更新函数，绘制所有图形
        this.setInterval(
            function() {
                ctx.clearRect(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT)
                statusbar.draw(ctx)
                for (var i = 0; i < circle_list.length; i++) {
                    circle_list[i].draw(ctx)
                }
                for (var i = 0; i < line_list.length; i++) {
                    line_list[i].draw(ctx)
                }
                if (is_finish) {
                    tip.draw(ctx)
                    wait_count++
                    if (wait_count >= wait_count_total) {
                        wait_count = 0
                        is_finish = false
                        reset()
                    }
                }
            },
            20,
            false,
        )
    </script>
</html>
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ios 安卓前端开发
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