48 lines
855 B
Dart
48 lines
855 B
Dart
// Dart has a habit of using double-inclusive bounds,
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// and I strongly prefer half-open bounds
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//
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// So: Here's a reimplementation of the geometry I need
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class Size {
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final int dx;
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final int dy;
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Size(this.dx, this.dy) {
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assert(dx >= 0);
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assert(dy >= 0);
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}
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}
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class Offset {
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final int x;
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final int y;
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const Offset(this.x, this.y);
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}
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class Rect {
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final int x0;
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final int y0;
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final int dx;
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final int dy;
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int get x1 => x0 + dx;
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int get y1 => y0 + dy;
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Rect(this.x0, this.y0, this.dx, this.dy) {
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assert(dx >= 0);
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assert(dy >= 0);
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}
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bool contains(int x, int y) {
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return x0 <= x && x < x1 && y0 <= y && y < y1;
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}
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bool containsPoint(Offset xy) {
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return contains(xy.x, xy.y);
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}
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bool containsRect(Rect rect) {
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return x0 <= rect.x0 && y0 <= rect.y0 && rect.x1 <= x1 && rect.y1 <= y1;
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}
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}
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