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using Unity.UIWidgets.foundation;
using Unity.UIWidgets.ui;
using Unity.UIWidgets.widgets;
namespace UIWidgetsSample {
public class CustomPaintSample : UIWidgetsSamplePanel {
protected override Widget createWidget() {
return new WidgetsApp(
home: new Unity.UIWidgets.widgets.CustomPaint(
child: new Container(width: 300, height: 300, color: new Color(0XFFFFFFFF)),
foregroundPainter: new GridPainter(null)
),
pageRouteBuilder: this.pageRouteBuilder);
}
}
public class GridPainter : AbstractCustomPainter {
public GridPainter(Listenable repaint) : base(repaint) {
}
public override void paint(Canvas canvas, Size size) {
int numGrid = 4;
var paint = new Paint();
paint.color = new Color(0xFFFF0000);
paint.strokeWidth = 2;
paint.style = PaintingStyle.stroke;
for (int i = 1; i < numGrid; i++) {
float offsetY = size.height * i / numGrid;
canvas.drawLine(new Offset(0, offsetY), new Offset(size.width, offsetY),
paint);
}
for (int i = 1; i < numGrid; i++) {
float offsetx = size.width * i / numGrid;
canvas.drawLine(new Offset(offsetx, 0), new Offset(offsetx, size.height),
paint);
}
// draw a arrow line
canvas.save();
canvas.rotate(0.4f);
canvas.scale(2, 2);
canvas.translate(50, 50);
canvas.drawLine(new Offset(0, 0), new Offset(100, 0),
new Paint() {
color = new Color(0xFFFF0000),
strokeWidth = 2,
style = PaintingStyle.stroke
});
var path = new Path();
var arrowPaint = new Paint() {
color = new Color(0xFFFF0000),
style = PaintingStyle.fill
};
path.moveTo(100, 0);
path.lineTo(100, 5);
path.lineTo(120, 0);
path.lineTo(100, -5);
path.close();
canvas.drawPath(path, arrowPaint);
canvas.restore();
}
public override bool shouldRepaint(CustomPainter oldDelegate) {
return false;
}
}
}