画布Canvas 画笔Paint

package com.example.m_evolution.View;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

import com.example.m_evolution.MyApp;

import static com.example.m_evolution.MyApp.COORDINATE_LENGTH;
import static com.example.m_evolution.MyApp.COORDINATE_ORIGIN_X;
import static com.example.m_evolution.MyApp.COORDINATE_ORIGIN_Y;
import static com.example.m_evolution.MyApp.STR_MOOD;

public class CoordinateView extends View {
    private Paint mPaint;

    public CoordinateView(Context context) {
        this(context, null);
    }

    public CoordinateView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CoordinateView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mPaint = new Paint();
        mPaint.setColor(Color.BLACK);
        mPaint.setAntiAlias(true);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(4);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint paint_coordinate = new Paint();
        paint_coordinate.setColor(Color.rgb(207,207,207));
        paint_coordinate.setAntiAlias(true);
        paint_coordinate.setStrokeCap(Paint.Cap.ROUND);
        paint_coordinate.setStrokeWidth(8);
        // 画出坐标轴
        int widthScreen = MyApp.getScreenWidth(getContext());
        int leftX = (int)((COORDINATE_ORIGIN_X-COORDINATE_LENGTH/2)*widthScreen);  //x轴左边坐标
        int rightX = (int)((COORDINATE_ORIGIN_X+COORDINATE_LENGTH/2)*widthScreen);  //x轴右边坐标
        int topY = (int)((COORDINATE_ORIGIN_Y-COORDINATE_LENGTH/2)*widthScreen);  //y轴上边坐标
        int bottomY = (int)((COORDINATE_ORIGIN_Y+COORDINATE_LENGTH/2)*widthScreen);  //y轴下边坐标
        int centerX = (leftX+rightX)/2;  //原点的x坐标
        int centerY = (topY+bottomY)/2;  //原点的y坐标
        int radiusCoordinate = (rightX-leftX)/2;  //轴的长度
        canvas.drawLine(leftX,centerY,rightX,centerY,paint_coordinate);  //画出x轴
        canvas.drawLine(centerX,topY,centerX, bottomY, paint_coordinate);  //画出x轴

        //画圆
        Paint paint_circle = new Paint();
        paint_circle.setColor(Color.rgb(207,207,207));
        paint_circle.setAntiAlias(true);
        paint_circle.setStyle(Paint.Style.STROKE);  //设置为描边，即只画边缘，不然的话就画出实心的圆
        paint_circle.setStrokeCap(Paint.Cap.ROUND);
        paint_circle.setStrokeWidth(4);
        canvas.drawCircle(centerX,centerY,((float)Math.sqrt((double)2)/3)*radiusCoordinate,paint_circle);
        canvas.drawCircle(centerX,centerY,((float)Math.sqrt((double)8)/3)*radiusCoordinate,paint_circle);

        //画圆弧
//        Paint paint_circle = new Paint();
//        paint_circle.setColor(Color.rgb(207,207,207));
//        paint_circle.setAntiAlias(true);
//        paint_circle.setStyle(Paint.Style.STROKE);  //设置为描边，即只画边缘，不然的话就画出实心的圆
//        paint_circle.setStrokeCap(Paint.Cap.ROUND);
//        paint_circle.setStrokeWidth(4);
//        RectF oval = new RectF(centerX-((float)Math.sqrt((double)2)/3)*radiusCoordinate, centerY-((float)Math.sqrt((double)2)/3)*radiusCoordinate, centerX+((float)Math.sqrt((double)2)/3)*radiusCoordinate, centerY+((float)Math.sqrt((double)2)/3)*radiusCoordinate);
        //第四个boolean参数表示要不要连接原点，具体效果与paint_circle.setStyle(Paint.Style.STROKE)相关联。
        //第二个参数是从哪个角度开始画，第三个参数是顺时针扫多少角度
//        canvas.drawArc(oval,0,360,false,paint_circle);

        //画出八个关键点
        Paint paint_mood_point = new Paint();
        paint_mood_point.setAntiAlias(true);
        paint_mood_point.setStrokeCap(Paint.Cap.ROUND);
        paint_mood_point.setStrokeWidth(10);
        paint_mood_point.setColor(Color.BLUE);
        //八个心情点的位置
        float[][] arr_mood_point = new float[][]{{2f/3f,2f/3f}, {1f/3f, 1f/3f}, {1f/3f, -1f/3f}, {2f/3f, -2f/3f}, {-2f/3f, -2f/3f}, {-1f/3f, -1f/3f}, {-1f/3f, 1f/3f},{-2f/3f, 2f/3f}};
        for(int i = 0;i<8; i++){
            canvas.drawPoint((float)centerX+arr_mood_point[i][0]*(float)radiusCoordinate,(float)centerY-arr_mood_point[i][1]*(float)radiusCoordinate,paint_mood_point);
        }

        //画出四个轴点
        Paint paint_xy_point = new Paint();
        paint_xy_point.setAntiAlias(true);
        paint_xy_point.setStrokeCap(Paint.Cap.ROUND);
        paint_xy_point.setStrokeWidth(20);
        paint_xy_point.setColor(Color.rgb(207,207,207));
        //四个轴点位置
        float[][] arr_xy_point = new float[][]{{1,0}, {-1, 0}, {0, 1}, {0, -1}};
        for(int i = 0;i<4; i++){
            canvas.drawPoint((float)centerX+arr_xy_point[i][0]*(float)radiusCoordinate,(float)centerY-arr_xy_point[i][1]*(float)radiusCoordinate,paint_xy_point);
        }

        //写出相应的字
        Paint paint_text = new Paint();
//        paint_text.setAntiAlias(true);
//        paint_text.setStrokeCap(Paint.Cap.ROUND);
//        paint_text.setStrokeWidth(10);
        paint_text.setTextSize(30f);
        paint_text.setColor(Color.BLACK);
        paint_text.setTextAlign(Paint.Align.CENTER);
        //八个心情的文字
        for(int i = 0;i<8; i++){
            canvas.drawText(STR_MOOD[i],(float)centerX+arr_mood_point[i][0]*(float)radiusCoordinate,(float)centerY-arr_mood_point[i][1]*(float)radiusCoordinate,paint_text);
        }
        //四个坐标下标的文字
        String str_xy[] = {"正能量", "负能量", "高压", "低压"};
        //横纵坐标的下标位置
        float[][] arr_point2 = new float[][]{{1f+0.13f,0f}, {-1f-0.13f, 0f}, {0f, 1f+0.05f}, {0f, -1f-0.1f}};
        for(int i = 0;i<4; i++){
            canvas.drawText(str_xy[i],(float)centerX+arr_point2[i][0]*(float)radiusCoordinate,(float)centerY-arr_point2[i][1]*(float)radiusCoordinate,paint_text);
        }
    }
}