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Adding a rotate method to Position and a drawWhere method to utils

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This commit is contained in:
Luan Nico
2017-12-30 21:59:45 -02:00
parent fbaec30724
commit 5eee726d92
2 changed files with 16 additions and 0 deletions
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8
lib/position.dart
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@@ -22,4 +22,12 @@ class Position {
double length() { double length() {
return math.sqrt(math.pow(this.x, 2) + math.pow(this.y, 2)); return math.sqrt(math.pow(this.x, 2) + math.pow(this.y, 2));
} }
Position rotate(double angle) {
double nx = math.cos(angle) * this.x - math.sin(angle) * this.y;
double ny = math.sin(angle) * this.x + math.cos(angle) * this.y;
this.x = nx;
this.y = ny;
return this;
}
} }

8
lib/util.dart
View File

@@ -5,6 +5,8 @@ import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart' as material; import 'package:flutter/material.dart' as material;
import 'package:flutter/services.dart'; import 'package:flutter/services.dart';
import 'position.dart';
class Util { class Util {
void fullScreen() { void fullScreen() {
SystemChrome.setEnabledSystemUIOverlays([]); SystemChrome.setEnabledSystemUIOverlays([]);
@@ -46,4 +48,10 @@ class Util {
} }
}); });
} }
void drawWhere(Canvas c, Position p, void Function(Canvas) fn) {
c.translate(p.x, p.y);
fn(c);
c.translate(-p.x, -p.y);
}
} }