Android图形graphics--饼图：HoloGraphLibrary源码修改

来源：互联网发布：中英联合声明失效知乎编辑：程序博客网时间：2024/05/22 09:40

public class PieSlice {    private int color;    private float value;    public int getColor() {        return color;    }    public void setColor(int color) {        this.color = color;    }    public float getValue() {        return value;    }    public void setValue(float value) {        this.value = value;    }}

public class PieGraph extends View {private ArrayList<PieSlice> slices = new ArrayList<PieSlice>();private Paint paint = new Paint();private int thickness = 50;public PieGraph(Context context) {super(context);}public PieGraph(Context context, AttributeSet attrs) {super(context, attrs);}    public void update() { postInvalidate(); }public void onDraw(Canvas canvas) {canvas.drawColor(Color.TRANSPARENT);paint.reset();paint.setAntiAlias(true);float midX, midY, radius, innerRadius;float currentAngle = 270;//起始角度        float currentSweep;        int totalValue = 0;midX = getWidth()/2;midY = getHeight()/2;if (midX < midY){radius = midX;} else {radius = midY;}innerRadius = radius - thickness;//用arcTo方法画360度的弧形是画不出来的，因此只有一种类型时考虑用画圆的方式if(slices!=null && slices.size()<=1){int saveCount = canvas.saveLayer(0, 0, getWidth(), getHeight(), null,Canvas.ALL_SAVE_FLAG);paint.reset();paint.setAntiAlias(true);if(slices.size()==1){paint.setColor(slices.get(0).getColor());}else {paint.setColor(Color.parseColor("#F0F1F2"));//没有类型时，默认显示一个灰色的饼图}canvas.drawCircle(midX, midY, radius, paint);paint.reset();paint.setAntiAlias(true);paint.setColor(Color.YELLOW);paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));canvas.drawCircle(midX, midY, innerRadius, paint);canvas.restoreToCount(saveCount);return;}for (PieSlice slice : slices){totalValue += slice.getValue();}for (PieSlice slice : slices){Path p = new Path();paint.setColor(slice.getColor());currentSweep = (slice.getValue()/totalValue)*(360);p.arcTo(new RectF(midX - radius, midY - radius, midX + radius, midY + radius), currentAngle, currentSweep);p.arcTo(new RectF(midX - innerRadius, midY - innerRadius, midX + innerRadius, midY + innerRadius), currentAngle + currentSweep, -currentSweep);p.close();canvas.drawPath(p, paint);currentAngle = currentAngle+currentSweep;}}public void addSlice(PieSlice slice) {this.slices.add(slice);postInvalidate();}}

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