Android 绘制心形
MyLove
package org.wp.activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.graphics.Typeface;import android.view.SurfaceHolder;import android.view.SurfaceView;/** * ================================================ * setTypeface * ================================================ * public Typeface setTypeface (Typeface typeface) * Since: API Level 1 Set or clear the typeface object. * Pass null to clear any previous typeface. * As a convenience, the parameter passed is also returned. * * Parameters * typeface May be null. The typeface to be installed in the paint * Returns * typeface * * * ================================================ * create * ================================================ * public static Typeface create (Typeface family, int style) * Since: API Level 1 Create a typeface object that best matches * the specified existing typeface and the specified Style. * Use this call if you want to pick a new style from the same family * of an existing typeface object. * If family is null, this selects from the default font's family. * * Parameters * family May be null. The name of the existing type face. * style The style (normal, bold, italic) of the typeface. * e.g. NORMAL, BOLD, ITALIC, BOLD_ITALIC * Returns * The best matching typeface. * * Typeface.create(Typeface family, int style) * 创建一个混合型新的字体：有4*5种搭配 * * Typeface类型 * DEFAULT 默认字体 * DEFAULT_BOLD 默认粗体 * MONOSPACE 单间隔字体 * SANS_SERIF 单间隔字体 * SERIF 衬线字体 * * int Style类型 * BOLD 粗体 * BOLD_ITALIC 粗斜体 * ITALIC 斜体 * NORMAL 普通字体 * * * ================================================ * drawRoundRect 画一个圆角矩形 * ================================================ * public void drawRoundRect (RectF rect, float rx, float ry, Paint paint) * Since: API Level 1 Draw the specified round-rect using the specified paint. * The roundrect will be filled or framed based on the Style in the paint. * Parameters * rect The rectangular bounds of the roundRect to be drawn * rx The x-radius of the oval used to round the corners * ry The y-radius of the oval used to round the corners * paint The paint used to draw the roundRect * * @author wp * */public class MyLove extends SurfaceView implements SurfaceHolder.Callback,Runnable {private SurfaceHolder sfh = null;private Paint paint = null;private Canvas canvas = null;private int SH = 0, SW = 0;private int miCount = 0;private boolean loop = false;public MyLove(Context context) {super(context);this.setKeepScreenOn(true);this.setFocusable(true);sfh = this.getHolder();sfh.addCallback(this);paint = new Paint();paint.setAntiAlias(true);paint.setTextSize(32);paint.setTypeface(Typeface.create(Typeface.SERIF, Typeface.ITALIC));loop = true;}@Overridepublic void surfaceCreated(SurfaceHolder holder) {SW = getWidth();SH = getHeight();new Thread(this).start();}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {loop = false;}@Overridepublic void run() {while (loop) {try {Thread.sleep(300);} catch (Exception e) {e.printStackTrace();}/* * synchronized 关键字,代表这个方法加锁 * 相当于不管哪一个线程A每次运行到这个方法时, * 都要检查有没有其它正在用这个方法的线程B(或者C D等) * * 有的话要等正在使用这个方法的线程B(或者C D) * 运行完这个方法后再运行此线程A, * * 没有的话,直接运行 * * 它包括两种用法：synchronized 方法和 synchronized 块。 */synchronized (sfh) {draw();}}}private void draw() {canvas = sfh.lockCanvas();try {if (canvas == null)return;/** 刷屏 **/paint.setColor(Color.BLACK);canvas.drawRect(0, 0, SW, SH, paint);/** 变换画笔的颜色 **/if (miCount < 100) {miCount++;} else {miCount = 0;}switch (miCount % 6) {case 0:paint.setColor(Color.BLUE);break;case 1:paint.setColor(Color.GREEN);break;case 2:paint.setColor(Color.RED);break;case 3:paint.setColor(Color.YELLOW);break;case 4:paint.setColor(Color.argb(255, 255, 181, 216));break;case 5:paint.setColor(Color.argb(255, 0, 255, 255));break;default:paint.setColor(Color.WHITE);break;}/** 画一个心 **/int i, j;double x, y, r;for (i = 0; i <= 90; i++) {for (j = 0; j <= 90; j++) {r = Math.PI / 45 * i * (1 - Math.sin(Math.PI / 45 * j))* 20;x = r * Math.cos(Math.PI / 45 * j)* Math.sin(Math.PI / 45 * i) + 320 / 2;y = -r * Math.sin(Math.PI / 45 * j) + 400 / 4;canvas.drawPoint((float) x, (float) y, paint);}}/** 绘制文字 **/canvas.drawText("Loving You", 75, 400, paint);/** 绘制圆角矩形 **/RectF rect = new RectF(60, 403, 260, 408);canvas.drawRoundRect(rect, (float) 1.0, (float) 1.0, paint);sfh.unlockCanvasAndPost(canvas);} catch (Exception e) {e.printStackTrace();}}}?
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