繪制多邊形

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.graphics.drawable.shapes.PathShape;
import android.graphics.drawable.shapes.RectShape;
import android.view.View;

/**
 * @version 2012-8-10 上午10:25:09
 **/
public class GameView extends View implements Runnable {
    Paint mPaint = null;
    GameView2 mGameView2 = null;

    public GameView(Context context) {
        super(context);
        mPaint = new Paint();
        mGameView2 = new GameView2(context);
        new Thread(this).start();
    }

    @Override
    public void run() {
        // 判讀該線程是否中斷
        while(!Thread.currentThread().isInterrupted()) {
            try {
                Thread.sleep(100);
            }
            catch(Exception e) {
                Thread.currentThread().interrupt();
            }
            // 使用postInvalidate可以直接線上程中更新界面
            postInvalidate();
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // 設定畫布顔色
        canvas.drawColor(Color.BLACK);
        // 取消鋸齒
        mPaint.setAntiAlias(true);
        // 畫空心
        mPaint.setStyle(Paint.Style.STROKE);
        {
            // 定義矩形
            Rect rect1 = new Rect();
            // 設定矩形大小
            rect1.left = 5;
            rect1.top = 5;
            rect1.bottom = 25;
            rect1.right = 45;
            mPaint.setColor(Color.BLUE);
            // 繪制矩形
            canvas.drawRect(rect1, mPaint);

            mPaint.setColor(Color.YELLOW);
            // 繪制圓形(圓心x坐标,圓心y坐标,半徑r,p)
            canvas.drawCircle(40, 70, 30, mPaint);
            // 橢圓形
            RectF rectf1 = new RectF();
            rectf1.left = 80;
            rectf1.top = 30;
            rectf1.right = 150;
            rectf1.bottom = 70;
            mPaint.setColor(Color.LTGRAY);
            canvas.drawOval(rectf1, mPaint);

            // 繪制多邊形
            Path path1 = new Path();
            // 起始點
            path1.moveTo(150 + 5, 80 - 50);
            path1.lineTo(150 + 45, 80 - 50);
            path1.lineTo(150 + 30, 120 - 50);
            path1.lineTo(150 + 20, 120 - 50);
            // 是這些點構成封閉的多邊形
            path1.close();
            mPaint.setColor(Color.GRAY);
            canvas.drawPath(path1, mPaint);

            mPaint.setColor(Color.RED);
            // 設定線的寬度
            mPaint.setStrokeWidth(3);
            // 劃線
            canvas.drawLine(5, 110, 315, 110, mPaint);
        }
        mGameView2.DrawShape(canvas);
    }

    public class GameView2 extends View {
        // 聲明ShapeDrawable對象
        ShapeDrawable mShapeDrawable = null;

        public GameView2(Context context) {
            super(context);
        }

        public void DrawShape(Canvas canvas) {
            // 執行個體化ShapeDrawable對象并說明是繪制一個矩形
            mShapeDrawable = new ShapeDrawable(new RectShape());
            // 得到畫筆Paint對象并設定其顔色
            mShapeDrawable.getPaint().setColor(Color.RED);
            Rect bounds = new Rect(15, 250, 55, 280);
            // 設定圖像顯示區域
            mShapeDrawable.setBounds(bounds);
            // 繪制圖像
            mShapeDrawable.draw(canvas);
            /* =========================== */
            // 繪制橢圓形
            mShapeDrawable = new ShapeDrawable(new OvalShape());
            // 設定畫筆顔色
            mShapeDrawable.getPaint().setColor(Color.GREEN);
            // 設定顯示區域
            mShapeDrawable.setBounds(70, 250, 150, 280);
            // 繪制圖像
            mShapeDrawable.draw(canvas);

            // 繪制多邊形
            Path path1 = new Path();
            path1.moveTo(150 + 5, 80 + 80 - 50);
            path1.lineTo(150 + 45, 80 + 80 - 50);
            path1.lineTo(150 + 30, 80 + 120 - 50);
            path1.lineTo(150 + 20, 80 + 120 - 50);
            path1.close();
            // 設定寬高
            mShapeDrawable = new ShapeDrawable(new PathShape(path1, 150, 150));
            mShapeDrawable.getPaint().setColor(Color.BLUE);
            // 設定顯示區域
            mShapeDrawable.setBounds(100, 170, 200, 280);
            // 繪制圖像
            mShapeDrawable.draw(canvas);
        }
    }
}
           

// 矩形
Rect rect = new Rect();
rect.top = 5;
rect.left = 5;
rect.bottom = 100;
rect.right = 100;
canvas.drawRect(rect, mPaint);

// 圓形cx,cy為圓心坐标,radius為半徑
canvas.drawCircle(160, 60, 50, mPaint);
// 橢圓
RectF rectF = new RectF();
rectF.top = 5;
rectF.left = 230;
rectF.bottom = 100;
rectF.right = 400;
canvas.drawOval(rectF, mPaint);
// 任意多邊形
Path path = new Path();
path.moveTo(5, 120);
path.lineTo(100, 150);
path.lineTo(130, 250);
path.close();
canvas.drawPath(path, mPaint);
// 劃線
canvas.drawLine(5, 300, 50, 400, mPaint);
// 畫點
canvas.drawPoint(200, 400, mPaint);