我试图通过使用sscanf解析数据来逐行初始化m * n矩阵。问题是在外循环的第二次迭代中，fgets不会等待任何输入。
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
public class Controller extends StackPane {
@FXML
private GridPane container;
@FXML
private GridPane topGridPane;
@FXML
private StackPane visualizerStackPane;
@FXML
private Canvas visualizerCanvas;
@FXML
private VBox topRightVBox;
@FXML
private StackPane mediaFileStackPane;
@FXML
private GridPane bottomGridPane;
// ------------------------------
GraphicsContext gc;
int canvasWidth = 0;
int canvasHeight = 0;
/**
* Constructor
*/
public Controller() {
// ------------------------FXMLLoader ---------------------------------
FXMLLoader loader = new FXMLLoader(getClass().getResource("Controller.fxml"));
loader.setController(this);
loader.setRoot(this);
try {
loader.load();
} catch (IOException ex) {
Logger.getLogger(getClass().getName()).log(Level.SEVERE, "Controller FXML can't be loaded!", ex);
}
}
/**
* Called as soon as FXML FILE has been loaded
*/
@FXML
private void initialize() {
gc = visualizerCanvas.getGraphicsContext2D();
// // VisualizerStackPane inside which visualizerCanvas is
// visualizerCanvas.widthProperty().bind(visualizerStackPane.widthProperty().subtract(4));
// visualizerCanvas.heightProperty().bind(visualizerStackPane.heightProperty().subtract(4));
//
// Add width and height change listeners
visualizerStackPane.widthProperty().addListener((observable, oldValue,
newValue) -> resizeVisualizerCanvas(newValue.doubleValue(), visualizerStackPane.getHeight()));
visualizerStackPane.heightProperty().addListener((observable, oldValue,
newValue) -> resizeVisualizerCanvas(visualizerStackPane.getWidth(), newValue.doubleValue())
);
repaintCanvas();
}
/**
* Repaints the Canvas
*/
public void repaintCanvas() {
//Clear the previous rectangle
gc.clearRect(0, 0, canvasWidth, canvasHeight);
// Draw the
gc.setFill(Color.RED);
gc.fillRect(0, 0, canvasWidth, canvasHeight);
// Draw the Line
gc.setLineWidth(3);
gc.setStroke(Color.WHITE);
gc.strokeLine(0, canvasHeight, canvasWidth, 0);
}
/**
* Resizes the visualizerCanvas to the given values.
*
* @param width
* the width
* @param height
* the height
*/
public void resizeVisualizerCanvas(double width, double height) {
if (width > 0 && height > 0) {
this.canvasWidth = (int) width;
this.canvasHeight = (int) height;
// Print something
System.out.println("Canvas Width is:" + width+" , Canvas Height is:"+height +" Canvas is Resizable: "+visualizerCanvas.isResizable());
// Repaint the Canvas
repaintCanvas();
// ---------------------------Below i have tried several things to
// solve the problem....
// Set the width and height of Canvas
visualizerCanvas.setWidth(width);
visualizerCanvas.setHeight(height);
// Careful with contentBias here
prefWidth(-1);
prefHeight(-1);
// autosize()
// System.out.println("Content Bias is:"+this.getContentBias())
}
}
}
这是调试输出：
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.canvas.Canvas?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.Region?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.layout.StackPane?>
<?import javafx.scene.layout.VBox?>
<fx:root prefHeight="212.0" prefWidth="456.0" type="StackPane" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1">
<padding>
<Insets bottom="2.0" left="2.0" right="2.0" top="2.0" />
</padding>
<children>
<GridPane fx:id="container">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" percentWidth="50.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" percentWidth="50.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" percentHeight="40.0" vgrow="SOMETIMES" />
<RowConstraints minHeight="10.0" percentHeight="60.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<GridPane fx:id="topGridPane" gridLinesVisible="true" GridPane.columnSpan="2">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" percentWidth="50.0" prefWidth="100.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" percentWidth="50.0" prefWidth="100.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<StackPane fx:id="visualizerStackPane" style="-fx-border-color: white; -fx-border-width: 1.5; -fx-background-color: rgb(0,0,0,0.95);">
<children>
<Canvas fx:id="visualizerCanvas" />
</children>
</StackPane>
<VBox fx:id="topRightVBox" GridPane.columnIndex="1">
<children>
<StackPane prefHeight="150.0" prefWidth="200.0">
<children>
<Region style="-fx-background-color: rgb(255,255,255,0.7);" />
<Label alignment="CENTER" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" style="-fx-font-weight: bold;" text="text here" />
</children>
</StackPane>
<StackPane fx:id="mediaFileStackPane" maxWidth="1.7976931348623157E308" />
</children>
</VBox>
</children>
</GridPane>
<GridPane fx:id="bottomGridPane" gridLinesVisible="true" GridPane.columnSpan="2" GridPane.rowIndex="1">
<columnConstraints>
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" percentWidth="20.0" prefWidth="35.0" />
<ColumnConstraints halignment="CENTER" hgrow="SOMETIMES" minWidth="10.0" percentWidth="60.0" prefWidth="343.0" />
<ColumnConstraints hgrow="SOMETIMES" minWidth="10.0" percentWidth="20.0" prefWidth="52.0" />
</columnConstraints>
<rowConstraints>
<RowConstraints minHeight="10.0" prefHeight="30.0" vgrow="SOMETIMES" />
</rowConstraints>
<children>
<StackPane prefHeight="150.0" prefWidth="200.0" GridPane.columnIndex="2">
<children>
<Region style="-fx-background-color: rgb(255,255,255,0.7);" />
<Label alignment="CENTER" maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" style="-fx-font-weight: bold;" text="text here" textAlignment="CENTER" wrapText="true" StackPane.alignment="CENTER" />
</children>
</StackPane>
<VBox prefHeight="200.0" prefWidth="100.0" spacing="5.0" />
</children>
</GridPane>
</children>
</GridPane>
</children>
</fx:root>
以及相应的输入：
for(i = 0; i < m; ++i){
if(fgets(line, sizeof(line), fp)){
for(j = 0; j < n; ++j){
printf("j = %d i = %d n = %d line = %s\n", j, i, n, line);//DEBUG
if(sscanf(line+j*2, "%g", &mtx[i][j]) != 1){
/*Manage the error*/
}
}
}
}