canvas_04 二次曲线

<template>
    <view class="zcvs">

        <view class="zcvs-item">
            <view>03_二次曲线</view>
            <view>
                <canvas class="zcvs-cvs" canvas-id="cvs" id="cvs" />
            </view>
        </view>

    </view>
</template>

<script>
    export default {
        data() {
            return {

            };
        },
        onReady() {
            this.drawCvs();
        },
        methods: {
            // 03_二次曲线
            drawCvs() {
                const ctx = uni.createCanvasContext('cvs');
                ctx.setLineWidth(15);
                ctx.setLineCap("round");

                ctx.beginPath();
                ctx.moveTo(50, 150);
                ctx.quadraticCurveTo(175, 0, 300, 150);
                ctx.setStrokeStyle("#007AFF");
                ctx.stroke();

                ctx.beginPath();
                ctx.moveTo(50, 150);
                ctx.quadraticCurveTo(175, -100, 300, 150);
                ctx.setStrokeStyle("#4CD964");
                ctx.stroke();

                ctx.beginPath();
                ctx.moveTo(50, 150);
                ctx.quadraticCurveTo(175, 300, 300, 150);
                ctx.setStrokeStyle("#DD524D");
                ctx.stroke();

                ctx.beginPath();
                ctx.moveTo(50, 150);
                ctx.quadraticCurveTo(15, -130, 300, 150);
                ctx.setStrokeStyle("#F0AD4E");
                ctx.stroke();

                ctx.beginPath();
                ctx.moveTo(50, 150);
                ctx.quadraticCurveTo(335, -130, 300, 150);
                ctx.setStrokeStyle("#F0AD4E");
                ctx.stroke();

                ctx.beginPath();
                ctx.setLineWidth(5);
                ctx.moveTo(135, 150);
                ctx.quadraticCurveTo(145, 120, 155, 150);
                ctx.setStrokeStyle("#F0AD4E");
                ctx.stroke();

                ctx.beginPath();
                ctx.setLineWidth(5);
                ctx.moveTo(195, 150);
                ctx.quadraticCurveTo(205, 120, 215, 150);
                ctx.setStrokeStyle("#F0AD4E");
                ctx.stroke();

                ctx.beginPath();
                ctx.setLineWidth(5);
                ctx.setLineCap("round");
                ctx.moveTo(155, 180);
                ctx.quadraticCurveTo(175, 220, 195, 180);
                ctx.setStrokeStyle("#F0AD4E");
                ctx.stroke();

                ctx.draw();
            },
            drawCvsn() {
                const ctx = uni.createCanvasContext('cvsn');
            },
        }
    }
</script>

<style lang="scss" scoped>
    .zcvs {
        .zcvs-item {
            border: 1upx solid #eee;
            margin-bottom: 40upx;
        }

        .zcvs-cvs {
            border: 1px solid #007AFF;
            height: 500upx;
             100%;
            box-sizing: border-box;
        }
    }
</style>