QrCodeGraphics class
Picture-recorder-backed canvas for QR raster output. 基于 PictureRecorder 的 QR 光栅输出画布。
Constructors
- QrCodeGraphics(int width, int height)
-
Creates a graphics buffer of
widthxheightpixels. 创建widthxheight像素的图形缓冲区。
Properties
- canvas → Canvas
-
Underlying Flutter canvas. 底层 Flutter 画布。
no setter
- hashCode → int
-
The hash code for this object.
no setterinherited
- height → int
-
Buffer height in pixels. 缓冲区高度（像素）。
final
- picture → Picture
-
no setter
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- width → int
-
Buffer width in pixels. 缓冲区宽度（像素）。
final
Methods
-
availableFormats(
) → List< String> -
cacheImage(
Uint8List rawData) → Future< void> -
changed(
) → bool - Whether any draw call modified the buffer since last reset. 自上次 reset 以来是否有绘制修改了缓冲区。
-
dimensions(
) → List< int> -
drawEllipse(
int x, int y, int width, int height, Color color, double thickness) → void -
drawImage(
Uint8List? rawData, int x, int y, {int? drawWidth, int? drawHeight}) → void -
drawLine(
int x1, int y1, int x2, int y2, Color color, double thickness) → void -
drawRect(
int x, int y, int width, int height, Color color, double thickness) → void -
drawRoundRect(
int x, int y, int width, int height, int borderRadius, Color color, double thickness) → void -
drawUiImage(
Image image, int x, int y, {int? drawWidth, int? drawHeight}) → void -
fill(
Color color) → void -
fillEllipse(
int x, int y, int width, int height, Color color) → void -
fillRect(
int x, int y, int width, int height, Color color) → void -
fillRoundRect(
int x, int y, int width, int height, int borderRadius, Color color) → void -
getBytes(
[String format = 'PNG']) → Future< Uint8List> -
nativeImage(
) → Future< Image> -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
reset(
) → void -
toImage(
) → Future< Image> -
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Static Methods
-
resolveImageProvider(
ImageProvider< Object> provider) → Future<Image> - Resolves an ImageProvider to a ui.Image. 将 ImageProvider 解析为 ui.Image。