Android(安卓)常用的画图方法
16lz
2021-12-04
package com.sonzer.CanvasDemo;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Matrix;import android.graphics.Paint;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.drawable.BitmapDrawable;import android.view.View;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.RotateAnimation;import android.view.animation.ScaleAnimation;import android.view.animation.TranslateAnimation;/** * 绘图常用方法演示 * @author sonzer * */public class CanvasView extends View {private Paint mPaint1 = null;private Bitmap mBitmap = null;public CanvasView(Context context) {super(context);// 初始化画笔mPaint1 = new Paint();mPaint1.setColor(Color.RED);// 设置笔刷颜色mPaint1.setStrokeWidth(2);// 设置笔刷粗细mPaint1.setAntiAlias(true);// 设置抗锯齿//初始化图片mBitmap = ((BitmapDrawable) getResources().getDrawable(R.drawable.sonzer_pic)).getBitmap();mBitmap = rotate(mBitmap, 10, 0, 0);// 图像旋转mBitmap = scale(mBitmap, 0.3f, 0.3f, 0, 0);// 图像缩放mBitmap = dispose(mBitmap, mBitmap.getWidth(), mBitmap.getHeight());// 灰度处理// 抗锯齿(感觉不明显)// canvas.setDrawFilter(new PaintFlagsDrawFilter(0,// Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG));alphaAnimation();//透明度渐变动画//translateAnimation();//平移动画//scaleAnimation();//缩放动画//rotateAnimation();//旋转动画}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);canvas.drawColor(Color.WHITE);// 设置画布背景颜色canvas.clipRect(0, 0, 320, 480);// 设置画布范围canvas.drawLine(20, 20, 100, 30, mPaint1);// 绘制线段canvas.drawPoint(60, 50, mPaint1);// 绘制点canvas.drawRect(new Rect(20, 70, 120, 100), mPaint1); // 绘制矩形canvas.drawRoundRect(new RectF(140, 70, 230, 100), 10, 10, mPaint1); // 绘制圆角矩形canvas.drawCircle(50, 140, 30, mPaint1);// 绘制圆形canvas.drawArc(new RectF(140, 110, 230, 170), 180, 90, true, mPaint1);// 绘制圆弧canvas.drawOval(new RectF(240, 110, 280, 170), mPaint1);// 绘制椭圆形canvas.drawText("绘制文字", 20, 200, mPaint1);// 绘制文字float[] points = new float[] { 35, 220, 20, 250, 20, 250, 50, 250, 35,220, 50, 250 };canvas.drawLines(points, mPaint1);// 绘制线段序列,相当3条线，6个坐标canvas.drawBitmap(mBitmap, 20, 270, null);// 绘制图片}/*** 图像旋转* * @param mBitmap* @param angle* @param px* @param py* @return*/public Bitmap rotate(Bitmap mBitmap, float angle, float px, float py) {Matrix matrix = new Matrix();matrix.reset();matrix.setRotate(angle, px, py);mBitmap = Bitmap.createBitmap(mBitmap, 0, 0, mBitmap.getWidth(),mBitmap.getHeight(), matrix, true);return mBitmap;}/*** 图像缩放* * @param sx* @param sy* @param px* @param py* @return*/public Bitmap scale(Bitmap mBitmap, float sx, float sy, float px, float py) {Matrix matrix = new Matrix();matrix.reset();matrix.setScale(sx, sy, px, py);mBitmap = Bitmap.createBitmap(mBitmap, 0, 0, mBitmap.getWidth(),mBitmap.getHeight(), matrix, true);return mBitmap;}/*** 灰度处理* * @param mBitmap* @param width* @param height* @return*/public Bitmap dispose(Bitmap mBitmap, final int width, final int height) {int bitmap[] = new int[width * height];mBitmap.getPixels(bitmap, 0, width, 0, 0, width, height);for (int i = 0; i > 16) & 0xff;int g = (bitmap[index] >> 8) & 0xff;int b = (bitmap[index]) & 0xff;// 计算灰度值double gray = r * 0.3 + g * 0.59 + b * 0.11;// 0xff000000 | (R <div class="it610-blog-content-contain" style="font-size: 14px"></div>
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