Canvas 文字对齐方式

常用的画文字的方法

public void drawText (String text, float x, float y, Paint paint)

x,y 并不是指定文字的中点位置，并且x,y与文字对齐方式有关（通过setTextAlign()指定，默认为left）

测试


import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;/*** Created by talon on 2021/3/10* note: 根据对象绘制图片* 参考：https://www.jianshu.com/p/8b97627b21c4*/
public class DrawBitmapManager4 {private final String TAG = "DrawImageManager";public static Bitmap createBitmap() {// 创建一个画布Bitmap bitmap = Bitmap.createBitmap(800, 1000, Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(bitmap);canvas.drawBitmap(bitmap, 0, 0, null);// 给画布加个边框Rect rect = new Rect(0, 0, canvas.getWidth(), canvas.getHeight());Paint paint = new Paint();paint.setColor(Color.BLACK);paint.setStyle(Paint.Style.STROKE);paint.setStrokeWidth(2);canvas.drawRect(rect, paint);// 开始测试数据// todo 证明： setStrokeWidth这个方法，并不是往canvas内侧填充，而是往外侧增加一半，往内侧增加一半。
//        testStrokeWidth(canvas);// todo  证明：文字居中方案setTextCenter(canvas); // 居中setTextLeft(canvas); // 左对齐setTextRight(canvas); // 右对齐return bitmap;}private static void testStrokeWidth(Canvas canvas) {// 划粗400px的线，只填充了200pxPaint paint = new Paint();paint.setColor(Color.BLACK);paint.setStyle(Paint.Style.STROKE);paint.setStrokeWidth(400);canvas.drawLine(0, 0, 0, canvas.getHeight(), paint);// 划线paint.setColor(Color.RED);paint.setStrokeWidth(5);canvas.drawLine(210, 0, 210, canvas.getHeight(), paint);}private static void setTextCenter(Canvas canvas) {//矩形背景Paint bgRect = new Paint();bgRect.setStyle(Paint.Style.FILL);bgRect.setColor(Color.TRANSPARENT);RectF rectF = new RectF(0, 0, canvas.getWidth(), canvas.getHeight());canvas.drawRect(rectF, bgRect);Paint textPaint = new Paint();textPaint.setStyle(Paint.Style.FILL);textPaint.setTextSize(100);textPaint.setTextAlign(Paint.Align.CENTER);String text = "测Zz试";//计算baseline ;Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();float distance = (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom;float baseline = rectF.centerY() + distance;canvas.drawText(text, rectF.centerX(), baseline, textPaint);// 划线标记中间位置textPaint.setColor(Color.RED);textPaint.setStrokeWidth(5);canvas.drawLine(0, canvas.getHeight() / 2, canvas.getWidth(), canvas.getHeight() / 2, textPaint);}private static void setTextLeft(Canvas canvas) {//矩形背景Paint bgRect = new Paint();bgRect.setStyle(Paint.Style.FILL);bgRect.setColor(Color.TRANSPARENT);RectF rectF = new RectF(0, 0, canvas.getWidth(), canvas.getHeight());canvas.drawRect(rectF, bgRect);Paint textPaint = new Paint();textPaint.setStyle(Paint.Style.FILL);textPaint.setTextSize(100);textPaint.setTextAlign(Paint.Align.LEFT);String text = "测Zz试";//计算baseline ;Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();float distance = (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom;float baseline = rectF.centerY() + distance;canvas.drawText(text, rectF.left, baseline, textPaint);// 划线标记中间位置textPaint.setColor(Color.RED);textPaint.setStrokeWidth(5);canvas.drawLine(0, canvas.getHeight() / 2, canvas.getWidth(), canvas.getHeight() / 2, textPaint);}private static void setTextRight(Canvas canvas) {//矩形背景Paint bgRect = new Paint();bgRect.setStyle(Paint.Style.FILL);bgRect.setColor(Color.TRANSPARENT);RectF rectF = new RectF(0, 0, canvas.getWidth(), canvas.getHeight());canvas.drawRect(rectF, bgRect);Paint textPaint = new Paint();textPaint.setStyle(Paint.Style.FILL);textPaint.setTextSize(100);textPaint.setTextAlign(Paint.Align.RIGHT);String text = "测Zz试";//计算baseline ;Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();float distance = (fontMetrics.bottom - fontMetrics.top) / 2 - fontMetrics.bottom;float baseline = rectF.centerY() + distance;canvas.drawText(text, rectF.right, baseline, textPaint);// 划线标记中间位置textPaint.setColor(Color.RED);textPaint.setStrokeWidth(5);canvas.drawLine(0, canvas.getHeight() / 2, canvas.getWidth(), canvas.getHeight() / 2, textPaint);}
}

Canvas 文字对齐方式相关推荐

PyQt5 QPushButton 设置文字对齐方式（基于setStyleSheet）
PyQt5 QPushButton 设置文字对齐方式(基于setStyleSheet) 创建一个QPushButton(文本默认居中对齐) import sys from PyQt5.QtWidget ...
AUTOCAD——调整十字光标、CAD表格文字对齐方式
CAD如何调整十字光标? 执行方式 1.输入自定义设置命令"OPTIONS"(快捷键:OP),按下空格键. 自定义设置 2.在弹出的选项界面中,打开显示页面,选择页面中的" ...
VBA- 设置指定列的文字对齐方式(遍历指定列，获取最后一行非空单元格行号)
Sub isColInfo(sheet As Worksheet)Dim LastRow As IntegerDim arrCol As VariantarrCol = Array("C&q ...
第2章第22节：文字对齐：常用的文字对齐方式 [PowerPoint精美幻灯片实战教程]
本节演示常见的文字对齐方式,首先选择需要操作的文字. 点击文字居中图标,可以将所选文字居中对齐. 接着选择另一组文字. 点击文字居中图标,将所选文字居中对齐. 继续选择第三组文字. 点击文本两端对齐图 ...
JXL导出EXCEL合并单元格、文字对齐方式 .
public void createNoLotteryAlarmExcel(String filePath,String fileName,List<NoLotteryAlarm> ala ...
JXL导出EXCEL合并单元格、文字对齐方式
这次能做出来,主要是感谢各位在网上提供的资料,在此记录导出的结果是,大家看哈,若有可取之处可继续代码比较多,大家主要看哈我用红色标注部分即可 --------------------------- ...
wordpress 表格文字对齐_Word文字对齐还用空格键？OUT了，这3个文字对齐方式你值得拥有！...
今天,无意之间看都到一个同事还在用空间键对齐文字,顿时我惊讶到了,这都什么年头呀,还在用这样方式进行对齐,哎,真是无药可救了. 看好了,今天小编让你摆脱文字对齐烦恼,让你的效率也能够提升起来. 1.调 ...
C# CAD 开发单行文字对齐方式详解
本人录制c#CAD二次开发视频基础入门全套,感兴趣可以点击下面链接 https://i.xue.taobao.com/detail.htm?spm=a2174.7765247.0.0.6EmxKK& ...
修改文字对齐方式，居中改为底部对齐
被提了无关紧要的问题,尤其是那种小的不能再小的问题.改起来还要费个牛劲! 接了个活,功能开发完了,结果要求改下对齐方式.文字居中改为底部对齐. 原本是这样的: 图不清晰,凑合看. 要改为: ..... ...

Canvas 文字对齐方式

Canvas 文字对齐方式

Canvas 文字对齐方式相关推荐

最新文章

热门文章