android shpe 三角形_自定义View实现三角形(正三角,倒三角)
importandroid.content.Context;importandroid.content.res.TypedArray;importandroid.graphics.Canvas;importandroid.graphics.Color;importandroid.graphics.Paint;importandroid.graphics.Path;importandroid.sup
importandroid.content.Context;importandroid.content.res.TypedArray;importandroid.graphics.Canvas;importandroid.graphics.Color;importandroid.graphics.Paint;importandroid.graphics.Path;importandroid.support.annotation.IntDef;importandroid.support.annotation.Nullable;importandroid.util.AttributeSet;importandroid.view.View;importjava.lang.annotation.Retention;importjava.lang.annotation.RetentionPolicy;/*** 三角形*/
public class TriangleView extendsView{privatePaint paint;privatePath path;private intcolor;private intmode;private final int DEFAULT_WIDTH=48;private final int DEFAULT_HEIGHT=24;private int width = 0;private int height =0;/*** 倒三角*/
public static final int INVERTED = 0;/*** 正三角*/
public static final int REGULAR = 1;
@IntDef({INVERTED, REGULAR})
@Retention(RetentionPolicy.SOURCE)public @interfaceShapeMode {}publicTriangleView(Context context) {this(context,null);
}publicTriangleView(Context context, @Nullable AttributeSet attrs) {this(context,attrs,0);
}public TriangleView(Context context, @Nullable AttributeSet attrs, intdefStyleAttr) {super(context, attrs, defStyleAttr);
init(context,attrs);
}private voidinit(Context context,AttributeSet attrs){
TypedArray typedArray=context.obtainStyledAttributes(attrs, R.styleable.TriangleView);
color=typedArray.getColor(R.styleable.TriangleView_tlv_color, Color.BLACK);
mode=typedArray.getInt(R.styleable.TriangleView_tlv_mode, INVERTED);
typedArray.recycle();
paint= newPaint();
paint.setColor(color);
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.FILL);
path= newPath();
}
@Overrideprotected void onMeasure(int widthMeasureSpec, intheightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width=measureSize(widthMeasureSpec, DEFAULT_WIDTH);
height=measureSize(heightMeasureSpec, DEFAULT_HEIGHT);
setMeasuredDimension(width, height);
}private int measureSize(int measureSpec, intdefaultSize) {int newSize = 0;int mode =MeasureSpec.getMode(measureSpec);int size =MeasureSpec.getSize(measureSpec);switch(mode) {caseMeasureSpec.AT_MOST:
newSize=Math.min(size, defaultSize);break;caseMeasureSpec.EXACTLY:
newSize=size;break;caseMeasureSpec.UNSPECIFIED:
newSize=defaultSize;break;
}returnnewSize;
}public void setColor(intcolor){this.color=color;
paint.setColor(color);
invalidate();
}public void setMode(@ShapeMode intmode){this.mode=mode;
invalidate();
}
@Overrideprotected voidonDraw(Canvas canvas) {super.onDraw(canvas);
drawTriangle(canvas);
}private voiddrawTriangle(Canvas canvas) {if(mode==INVERTED) {
path.moveTo(0f, 0f);
path.lineTo(width, 0f);
path.lineTo(width/ 2.0f, height);
}else{
path.moveTo(width/2.0f,0f);
path.lineTo(0,height);
path.lineTo(width,height);
}
path.close();
canvas.drawPath(path, paint);
}
}
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