canvas_08 自定义图形

<template>
    <view class="zcvs">

        <view class="zcvs-item">
            <view>07_自定义图形</view>
            <view>
                <canvas class="zcvs-cvs" canvas-id="cvs" id="cvs" />
            </view>
        </view>

    </view>
</template>

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

            };
        },
        onReady() {
            this.drawCvs();
        },
        methods: {
            drawCvs() {
                const ctx = uni.createCanvasContext(‘cvs‘);
                ctx.setLineWidth(3);
                ctx.setStrokeStyle("#007AFF");
                ctx.setFillStyle("#DD524D");

                let centerX = 150;
                let centerY = 150;
                let radius = 80;
                let x1, y1;
                let angle = 0;

                ctx.beginPath();
                // 做个辅助线 画6瓣形
                for (let i = 0; i < 6; i++) {
                    // 角度转弧度 = 角度 / 180 * Math.PI
                    x1 = centerX + radius * Math.cos(angle * Math.PI / 180);
                    y1 = centerY + radius * Math.sin(angle * Math.PI / 180);
                    console.log(x1, y1);
                    // 230 150, 190 219, 110,219, 70 150, 110 81, 190 81
                    ctx.moveTo(centerX, centerY);
                    ctx.lineTo(x1, y1);
                    angle += 60;
                }
                ctx.stroke();

                // 画花瓣
                ctx.beginPath()
                ctx.setStrokeStyle("#4CD964");
                ctx.moveTo(230, 150);
                ctx.bezierCurveTo(230, 200, 250, 190, 190, 219);
                ctx.bezierCurveTo(130, 250, 150, 230, 110, 219);
                ctx.bezierCurveTo(80, 200, 50, 230, 70, 150);
                ctx.bezierCurveTo(70, 130, 40, 100, 110, 81);
                ctx.bezierCurveTo(130, 50, 150, 30, 190, 81);
                ctx.bezierCurveTo(230, 91, 250, 100, 230, 150);
                ctx.stroke();

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

<style lang="scss" scoped>
    .zcvs {

        .zcvs-item {
            margin-bottom: 20px;
        }

        .zcvs-cvs {
            border: 1px solid #eee;
            height: 300px;
            width: 100%;
            box-sizing: border-box;
        }
    }
</style>