HarmonyOS canvas支持画圆角矩形吗

HarmonyOS

zbw_apple

2024-08-09 15:45:19

浏览

回答 1

待解决

回答 1

按赞同

按时间

put_get

请参考如下demo：

@Entry 
@Component 
struct Page { 
  @State message: string = 'Hello World'; 
  private readonly settings: RenderingContextSettings = new RenderingContextSettings(true); 
  private readonly ctx: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings); 
  /** 
   绘制圆角矩形 
   @param {* 必填} x x坐标 
   @param {* 必填} y y坐标 
   @param {* 必填} width 宽度 
   @param {* 必填} height 高度 
   @param {* 必填} radius 圆角半径 
   @param {* 非必填 默认值：’#456’} strokeColor 边框颜色 
   @param {* 非必填 无默认值} fillColor 填充颜色 
   @param {* 非必填 默认值：[]实线} lineDash 边框样式 
   */ 
  drawRoundRect(x: number, y: number, width: number, height: number, radius: number, strokeColor?: string, fillColor?: string, lineDash?: []) { 
    strokeColor = strokeColor || '#333'; 
    lineDash = lineDash || []; 
    this.ctx.beginPath(); 
    this.ctx.setLineDash(lineDash); 
    this.ctx.arc(x + radius, y + radius, radius, Math.PI, Math.PI * 3 / 2); 
    this.ctx.lineTo(width - radius + x, y); 
    this.ctx.arc(width - radius + x, radius + y, radius, Math.PI * 3 / 2, Math.PI * 2); 
    this.ctx.lineTo(width + x, height + y - radius); 
    this.ctx.arc(width - radius + x, height - radius + y, radius, 0, Math.PI / 2); 
    this.ctx.lineTo(radius + x, height + y); 
    this.ctx.arc(radius + x, height - radius + y, radius, Math.PI / 2, Math.PI); 
    this.ctx.lineTo(x, y + radius); 
    this.ctx.strokeStyle = strokeColor; 
    this.ctx.stroke(); 
    if (fillColor) { 
      this.ctx.fillStyle = fillColor; 
      this.ctx.fill(); 
    } 
    this.ctx.closePath(); 
  } 
  build() { 
    Row() { 
      Column() { 
        Canvas(this.ctx) 
          .width('100%') 
          .height('100%') 
          .onReady(() => { 
            this.drawRoundRect(50, 50, 100, 100, 10) 
          }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}