canvas_16 裁剪区

<template>
    <view class="zcvs">

        <view class="zcvs-item">
            <view>Canvas_裁剪区</view>
            <view>
                <canvas canvas-id="cvs" id="cvs" style="width: 400px; height: 400px;border: 1px solid #007AFF;" />
            </view>

        </view>

    </view>
</template>

<script>
    export default {
        data() {
            return {};
        },
        onReady() {
            this.drawCvs();
        },
        methods: {
            drawCvs() {
                const ctx = uni.createCanvasContext('cvs');
                ctx.setLineWidth(5);
                ctx.setStrokeStyle("#007AFF");

                const centX = 200;
                const centY = 200;
                const radius = 75;
                const offset = 50;
                ctx.save();

                // 圆形裁剪区
                ctx.beginPath();
                ctx.arc(centX, centY, radius, 0, 2 * Math.PI, false);
                ctx.stroke();
                ctx.clip();

                // 裁剪区画圆
                ctx.beginPath();
                ctx.arc(centX - offset, centY - offset, radius, 0, 2 * Math.PI, false);
                ctx.setFillStyle("#4CD964");
                ctx.fill();
                // 裁剪区画圆
                ctx.beginPath();
                ctx.arc(centX + offset, centY, radius, 0, 2 * Math.PI, false);
                ctx.setFillStyle("#DD524D");
                ctx.fill();
                // 裁剪区画圆
                ctx.beginPath();
                ctx.arc(centX, centY + offset, radius, 0, 2 * Math.PI, false);
                ctx.setFillStyle("#F0AD4E");
                ctx.fill();

                ctx.draw();
            },
        }
    }
</script>

<style lang="scss" scoped></style>

标签：canvas,centX,const,16,裁剪,ctx,centY,radius
来源： https://www.cnblogs.com/luwei0915/p/15257373.html