Android工作室中的钻石形状

Question

我在Android工作室使用路径创建钻石形状时遇到了麻烦。看起来我有一半以上的钻石，但我不知道我做错了什么以及为什么其余部分没有打印出来。我一直试图改变我的代码几个小时，没有任何工作。谁能指出我做错了什么？到目前为止，这是我的代码：

import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.drawable.shapes.Shape;

public class Diamond extends Shape {
private int strokeWidth;
private final int fillColor;
private int strokeColor;
private Path path;
private Paint strokePaint;
private Paint fillPaint;

public Diamond(int strokeWidth, int fillColor, int strokeColor) {
    this.strokeWidth = strokeWidth;
    this.fillColor = fillColor;
    this.strokeColor = strokeColor;

    this.strokePaint = new Paint();
    this.strokePaint.setStyle(Paint.Style.STROKE);
    this.strokePaint.setStrokeWidth(strokeWidth);

    this.fillPaint = new Paint();
    this.fillPaint.setStyle(Paint.Style.FILL);
    this.fillPaint.setColor(fillColor);
}
@Override
public void draw(Canvas canvas, Paint paint) {
    canvas.drawPath(path, fillPaint);
    canvas.drawPath(path, strokePaint);

}
@Override
protected void onResize(float width, float height) {
    super.onResize(width, height);
    path = new Path();
    path.moveTo(width/2, 0);
    path.lineTo(width, height);
    path.lineTo(width/2, height*4);
    path.lineTo(0, height);
    path.close();



}

}

Answer 1

我认为你应该只需要改变path.lineTo(width/2, height*4);而不是像path.lineTo(width/2, height*2);那样将高度乘以2，使用4使得下半部分比顶部倾斜更长。还有一个关于this page绘制菱形的例子，你可以通过使用全宽来修改以绘制钻石，例如：

public void drawRhombus(Canvas canvas, Paint paint, int x, int y, int width) {
    int halfWidth = width / 2;

    Path path = new Path();
    path.moveTo(x, y + width); // Top
    path.lineTo(x - halfWidth, y); // Left
    path.lineTo(x, y - width); // Bottom
    path.lineTo(x + halfWidth, y); // Right
    path.lineTo(x, y + width); // Back to Top
    path.close();

    canvas.drawPath(path, paint);
}