在Java 中旋轉資料和文字的座標平面
此問題解決了在y 軸上繪製資料點和旋轉標籤的挑戰數據圖。提供的程式碼定義了繪製資料和標籤的基本結構，但遇到了兩個困難：
解決問題
為了解決這些問題，讓我們專注於以下修改：
1.旋轉座標平面
我們可以旋轉座標平面以與新原點（藍色矩形的左下角）對齊，並使用以下程式碼反轉y 軸：
<code class="java">g2d.translate(leftStartPlotWindow, blueTop);//translate origin to bottom-left corner of blue rectangle g2d.scale(1, -1);//invert the y-axis</code>
2。繪製資料
我們透過將資料乘以標量來調整資料以適合旋轉的座標平面：
<code class="java">double Scalar = blueWidth/maxPlot;
ArrayList<Double> scaledDiffs = new ArrayList<>();
for(int e = 0;e<myDiffs.size();e++){scaledDiffs.add(myDiffs.get(e)*Scalar);}</code>3。旋轉Y 軸標籤的文字
要在y 軸上旋轉標籤，我們使用以下代碼：
<code class="java">g2d.rotate(Math.toRadians(-90), 0, 0);//rotate text 90 degrees counter-clockwise g.drawString(yString, -(height/2)-(yStrWidth/2), yStrHeight); g2d.rotate(Math.toRadians(+90), 0, 0);//rotate text 90 degrees clockwise</code>
完整代碼
完整代碼完整代碼
<code class="java">//... Previous code omitted for brevity
import java.awt.geom.AffineTransform;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.List;
class DataGUI extends JFrame{
//... Previous code omitted for brevity
@Override
public void paint(Graphics g) {
// ... Previous code omitted for brevity
int height = getHeight();
int width = getWidth();
ins = getInsets();
// Obtain data about graphics environment and text
Graphics2D g2d = (Graphics2D) g;
FontMetrics fontMetrics = g2d.getFontMetrics();
String xString = "x-axis Label";
int xStrWidth = fontMetrics.stringWidth(xString);
int xStrHeight = fontMetrics.getHeight();
// Set parameters for the inner rectangle
int hPad = 10;
int vPad = 6;
int testLeftStartPlotWindow = ins.left + 5 + (3 * yStrHeight);
int testInnerWidth = width - testLeftStartPlotWindow - ins.right - hPad;
// Find minimum and maximum values
getMaxMinDiffs();
getMaxPlotVal();
// Determine the maximum number of ticks for the axes
double increment = 5.0;
int numTicks = (int) (maxPlot / increment);
int remainder = testInnerWidth % numTicks;
int leftStartPlotWindow = testLeftStartPlotWindow - remainder;
// Calculate the bottom padding and blue rectangle dimensions
int bottomPad = (3 * xStrHeight) - vPad;
int blueTop = ins.bottom + (vPad / 2) + titleStrHeight;
int blueHeight = height - bottomPad - blueTop;
int blueWidth = blueHeight;
int blueBottom = blueHeight + blueTop;
// Start drawing
// ... Previous code omitted for brevity
// Scale the diffs to fit the window
double Scalar = blueWidth / maxPlot;
List<Double> scaledDiffs = new ArrayList<>();
for (Double myDiff : myDiffs) {
scaledDiffs.add(myDiff * Scalar);
}
// Rotate the graphics context for plotting data
AffineTransform at = g2d.getTransform();
g2d.translate(leftStartPlotWindow, blueTop);
g2d.scale(1, -1);
// Plot the scaled diffs
for (int w = 0; w < scaledDiffs.size(); w++) {
if (w > 0) {
double prior = scaledDiffs.get(w - 1);
int priorInt = (int) prior;
double current = scaledDiffs.get(w);
int currentInt = (int) current;
g2d.drawOval(priorInt, currentInt, 4, 4);
}
}
// Restore the transform for conventional rendering
g2d.setTransform(at);
// ... Rest of the code omitted for brevity
}
// ... Previous code omitted for brevity
}</code>完整代碼
<code class="java">//... Previous code omitted for brevity
@Override
protected void paintComponent(Graphics g) {
//... Previous code omitted for brevity
int blueTop = ins.bottom+(vPad/2)+titleStrHeight;
int blueHeight = height-bottomPad-blueTop;
int blueWidth = blueHeight;
int blueBottom = blueHeight+blueTop;
//... Previous code omitted for brevity
// Rotate the graphics context for y-axis labels
g2d.rotate(Math.toRadians(-90), 0, 0);
g.drawString(yString, -(height/2)-(yStrWidth/2), yStrHeight);
// Restore the graphics context for normal rendering
g2d.rotate(Math.toRadians(+90), 0, 0);
//... Previous code omitted for brevity
}</code>完整代碼
完整代碼以上是如何在Java中旋轉座標平面和y軸標籤以實現資料視覺化？的詳細內容。更多資訊請關注PHP中文網其他相關文章！
