9
到目前爲止，我可以使用一些代碼參考形式stackoverflow繪製半圓。現在我想把針畫到這個半圓上。 我不知道該怎麼做。這裏是半圓代碼編輯：Android將針圖像繪製到此類似計量表的圓圈
package in.ashish29agre.stackoverflow.sample.semicircle;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.view.View;
public class MyGraphView extends View {
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
private float[] value_degree;
private int[] COLORS = { Color.GREEN, Color.RED, Color.GREEN, Color.RED };
// size of bigger half circle
RectF rectf = null;
// size of smaller half circle
// RectF rectf2 = new RectF(45, 45, 275, 275);
// size of the smallest half circle
// RectF rectf3 = new RectF(80, 80, 240, 240);
int temp = 0;
public MyGraphView(Context context, float[] values) {
super(context);
rectf = new RectF();
value_degree = new float[values.length];
for (int i = 0; i < values.length; i++) {
value_degree[i] = values[i];
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = getMeasuredWidth();
int height = getMeasuredHeight();
rectf.set(100, 100, width - 100, height - 100);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
for (int i = 0; i < value_degree.length; i++) {
// set type of "brush"
paint.setStrokeWidth(128);
paint.setStyle(Paint.Style.STROKE);
// agree
if (i == 0) {
final Path path = new Path();
paint.setColor(COLORS[i]);
// draw 3 paths to show 3 curves
path.addArc(rectf, 180, value_degree[i] - 4);
// path.addArc(rectf2, 180, value_degree[i] - 5);
// path.addArc(rectf3, 180, value_degree[i] - 6);
// draw the path
canvas.drawPath(path, paint);
// disagree
} else {
temp += (int) value_degree[i - 1];
paint.setColor(COLORS[i]);
final Path path = new Path();
path.addArc(rectf, temp + 180 , value_degree[i] - 0);
// path.addArc(rectf2, temp + 180 + 5, value_degree[i] - 5);
// path.addArc(rectf3, temp + 180 + 6, value_degree[i] - 6);
// draw the path
canvas.drawPath(path, paint);
}
drawLine(canvas);
}
}
private void drawLine(Canvas canvas) {
float startAngle = 180;
float sweepAngle = 180;
Paint mPaint = new Paint();
mPaint.setStrokeWidth(22f);
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
float startX = rectf.centerX();
float startY = rectf.centerY();
float radius = rectf.centerX() - 100;
float angle = (float) ((startAngle + sweepAngle/2) * Math.PI/180);
float stopX = (float) (startX + radius * Math.cos(angle));
float stopY = (float) (startY + radius * Math.sin(angle));
canvas.drawLine(startX, startY, stopX, stopY, mPaint);
}
}
從使用
float values[] = { 10, 20, 30, 40};
LinearLayout linear = (LinearLayout) findViewById(R.id.graph_view);
values = calculateData(values);
// draw the graf
linear.addView(new MyGraphView(this, values));
的活動我稱之爲這是我的活動XML代碼
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="in.ashish29agre.stackoverflow.sample.semicircle.SemiCircleActivity">
<LinearLayout
android:id="@+id/graph_view"
android:layout_width="200dp"
android:layout_height="200dp"
android:orientation="vertical"
android:layout_centerInParent="true"
android:layout_alignParentTop="true"></LinearLayout>
</RelativeLayout>
目前的觀點看起來像這現在我想添加可以從0-180度移動的米手。
任何幫助將不勝感激。
現在，我已經繪製了針，我想製作一個針位圖？
請加針法師，預期結果的圖像看針的位置，大小。 – Gavriel