classDrawPainterextendsCustomPainter{@overridevoidpaint(Canvas canvas, Size size) {finaltextStyle = ui.TextStyle(color: Colors.black, fontSize:30);finalparagraphStyle = ui.ParagraphStyle(textDirection: TextDirection.ltr);finalparagraphBuilder = ui.ParagraphBuilder(paragraphStyle); paragraphBuilder.pushStyle...
通过canvas的drawCircle可实现绘制实心圆或者是圆环，基本绘制代码如下：class CirclePainter extends CustomPainter { //[定义画笔] final Paint _paint = Paint() ..color = Colors.blue ..style= PaintingStyle.stroke ..strokeWidth = 4.0; @override void paint(Canvas canvas, Size size) { ...
//画棋子voiddrawPieces(Canvas canvas, Rect rect) {doubleeWidth = rect.width /15;doubleeHeight = rect.height /15;//画一个黑子varpaint = Paint() ..style = PaintingStyle.fill ..color = Colors.black;//画一个黑子canvas.drawCircle( Offset(rect.center.dx - eWidth /2, rect.center.dy - ...
canvas.drawCircle(Offset(width/2, height/2), radius, _paint); 通过Gradient.linear创建一个线性渐变颜色并设置给Paint.shader,绘制出来效果如下: dial01.png 然后在其上添加一层径向渐变,增加表盘的立体感: /// 绘制一层径向渐变的圆 var radialGradient = ui.Gradient.radial(Offset(width/2, height/2),...
void drawCircle(Offset c, double radius, Paint paint) 参数分别为:圆心的坐标、半径和paint即可。 圆形是否填充或描边(或两者)由Paint.style控制。 //绘制圆 参数(圆心,半径,画笔)canvas.drawCircle(Offset(100.0,350.0),30.0, _paint ..color = Colors.greenAccent ...
接着上一篇《Flutter:成为Canvas绘制大师(一)》,本篇继续讲解 Canvas 中的常用绘制操作。 绘制圆形drawCircle() 绘制圆形。 🌰 e.g.: canvas.drawCircle(Offset(size.width / 2, size.height / 2), 100, paint); 🖼 效果: image 设置空心效果paint..style=PaintingStyle.stroke。
通过canvas的drawCircle可实现绘制实心圆或者是圆环,基本绘制代码如下: class CirclePainter extends CustomPainter { //[定义画笔] final Paint _paint = Paint() ..color = Colors.blue ..style= PaintingStyle.stroke ..strokeWidth = 4.0; @override void paint(Canvas canvas, Size size) { //参数一 圆心...
drawCircle:正圆 drawOval:根据传入的Rect,画正圆和椭圆 /// 正圆canvas.drawCircle(Offset(100, 100), 30, _paint);/// 也是正圆canvas.drawOval(Rect.fromLTRB(0,0,100,100),_paint);/// 椭圆canvas.drawOval(Rect.fromLTRB(0,0,100,100),_paint); ...
通过canvas画布的方法drawRect可以用来绘制矩形，如下图所示是绘制的一个矩形：核心实现代码如下：绘制矩形的核心内容主要是创建Rect矩形，方式二是通过Rect的静态方法fromLTWH根据设置左上角的点与矩形宽高来绘制，坐标分析如下图所示，这样创建出来的矩形实际width为参数三配置的值150，height为参数四配置的值100，代码...
canvas.drawArc( Rect.fromCircle(center: center, radius: radius), startAngle, sweepAngle, true, fillPaint, ); } @override bool shouldRepaint(covariant CustomPainter oldDelegate) { return true; } } void main() { runApp(MaterialApp( home: Scaffold( ...