从3分得到一个矩形
我正在制作一个饼图，每个饼图上都有一个文字。为了使每个饼图上的文本居中，我需要一个下面解释的Rect对象：
这是一个示例饼图：
你可以看到4个点：中心和与饼图圆周相交的三个点三行：
现在要将文本居中放在每个饼图上，我想为每个文本制作3个Rect对象：
我不想绘制任何矩形，但需要一个与这些点对应的Rect对象。每个Rect必须包含圆圈上相应的饼图切片所做的交点，即圆心。知道怎么做吗？我希望我的问题清楚。
我的饼图代码：
public class PieView extends View {
String[] names;
int values[];
public PieView(Context context) {
super(context);
}
public PieView(Context context, int nums[], String nam[]) {
super(context);
names = nam;
values = nums;
}
@Override
protected void onDraw(Canvas canvas) {
DecimalFormat df = new DecimalFormat("#.00");
super.onDraw(canvas);
int radius = getHeight() / 2;
int total = sum(values);
String percentage[] = { df.format((values[0] * 100) / total),
df.format((values[1] * 100) / total),
df.format((values[2] * 100) / total) };
Paint green = new Paint();
Paint red = new Paint();
Paint blue = new Paint();
blue.setAntiAlias(true);
green.setAntiAlias(true);
red.setAntiAlias(true);
blue.setColor(Color.parseColor("#30abd9"));
green.setColor(Color.parseColor("#30d976"));
red.setColor(Color.parseColor("#db7a26"));
blue.setStyle(Paint.Style.FILL);
green.setStyle(Paint.Style.FILL);
red.setStyle(Paint.Style.FILL);
RectF rectf = new RectF(
new Rect(getWidth() / 2 - radius, getHeight() / 2 - radius,
getWidth() / 2 + radius, getHeight() / 2 + radius));
canvas.drawArc(rectf, 0, (values[0] * 360) / total, true, blue);
canvas.drawArc(rectf, (values[0] * 360) / total, (values[1] * 360)
/ total, true, green);
canvas.drawArc(rectf, ((values[0] * 360) / total)
+ ((values[1] * 360) / total),
360 - (((values[0] * 360) / total) + ((values[1] * 360))
/ total), true, red);
Paint eraserPaint = new Paint();
eraserPaint.setColor(Color.parseColor("#f2f2f2"));
eraserPaint.setStrokeWidth(3);
canvas.drawLine(getWidth() / 2, getHeight() / 2, getWidth() / 2
+ radius, getHeight() / 2, eraserPaint);
canvas.drawLine(
(float) getWidth() / 2,
(float) getHeight() / 2,
(float) (getWidth() / 2 + radius
* (Math.cos(Math.toRadians((values[0] * 360) / total)))),
(float) (getHeight() / 2 + radius
* Math.sin(Math.toRadians((values[0] * 360) / total))),
eraserPaint);
canvas.drawLine(
(float) getWidth() / 2,
(float) getHeight() / 2,
(float) (getWidth() / 2 + radius
* (Math.cos(Math.toRadians(((values[0] * 360) / total)
+ ((values[1] * 360) / total))))),
(float) (getHeight() / 2 + radius
* Math.sin(Math.toRadians(((values[0] * 360) / total)
+ ((values[1] * 360) / total)))), eraserPaint);
// if (values[0] != 0) {
// Rect areaRect1 = new Rect(getWidth()/2, 90,
// columnsAreaWidth + widthLeft + 15, 130);
// canvas.drawRect(areaRect1, eraserPaint);
// RectF bounds1 = new RectF(areaRect1);
// bounds1.right = eraserPaint.measureText("Easy\n"+values[0], 0, new
// String(
// "Easy\n"+values[0]).length());
// // measure text height
// bounds1.bottom = eraserPaint.descent() - eraserPaint.ascent();
// bounds1.left += (areaRect1.width() - bounds1.right) / 2.0f;
// bounds1.top += (areaRect1.height() - bounds1.bottom) / 2.0f;
// canvas.drawText("Easy\n"+values[0], bounds1.left,
// bounds1.top - eraserPaint.ascent(), eraserPaint);
//
// }
}
@Override
public void setLayoutParams(LayoutParams params) {
super.setLayoutParams(params);
}
private int sum(int[] num) {
int x = 0;
for (int i = 0; i < num.length; i++) {
x += num[i];
}
return x;
}
}
注释代码用于文本。我需要Rect对象。
1 个答案:
答案 0 :(得分：1)
感谢@pskink，我得到了答案。这是我的饼图的完整代码。我只为3个值制作了它，但它可以通用，几乎没有变化。希望它可能对某人有用：）
package com.utils;
import org.json.JSONArray;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
public class ColumnsView extends View {
JSONArray array;
public ColumnsView(Context context) {
super(context);
}
public ColumnsView(Context context, JSONArray jar) {
super(context);
array = jar;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint green = new Paint();
Paint red = new Paint();
Paint grey = new Paint();
Paint textColor = new Paint();
textColor.setColor(Color.parseColor("#b8b8b8"));
textColor.setStrokeWidth(5);
textColor.setTextSize(25);
grey.setColor(Color.parseColor("#e1e1e1"));
green.setColor(Color.parseColor("#91cc33"));
red.setColor(Color.parseColor("#d93030"));
grey.setStyle(Paint.Style.FILL);
red.setStyle(Paint.Style.FILL);
green.setStyle(Paint.Style.FILL);
int width = getWidth();
int columnsAreaWidth = width - 200;
int columnHeight = 240;
int columnWidth = columnsAreaWidth / (array.length() + 1);
int gapWidth = columnWidth / array.length();
try {
int freeWidth = gapWidth;
for (int i = 0; i < array.length(); i++) {
int total = Integer.parseInt(array.getJSONObject(i).getString(
"Total"));
int correct = Integer.parseInt(array.getJSONObject(i)
.getString("Correct"));
int incorrect = Integer.parseInt(array.getJSONObject(i)
.getString("Incorrect"));
int unattempted = Integer.parseInt(array.getJSONObject(i)
.getString("Unattempted"));
String name = array.getJSONObject(i).getString("Level");
int correctHeight = (columnHeight * correct) / total;
int unattemptedHeight = (columnHeight * unattempted) / total;
int incorrectHeight = columnHeight - correctHeight
- unattemptedHeight;
canvas.drawRect(freeWidth, 0, freeWidth + columnWidth,
correctHeight, green);
canvas.drawRect(freeWidth, correctHeight, freeWidth
+ columnWidth, correctHeight + unattemptedHeight, grey);
canvas.drawRect(freeWidth, correctHeight + unattemptedHeight,
freeWidth + columnWidth, columnHeight, red);
int xPos = (canvas.getWidth() / 2);
Rect areaRect = new Rect(freeWidth - gapWidth,
columnHeight + 10, freeWidth + columnWidth + gapWidth,
columnHeight + 40);
RectF bounds = new RectF(areaRect);
bounds.right = textColor.measureText(name, 0, name.length());
bounds.bottom = textColor.descent() - textColor.ascent();
bounds.left += (areaRect.width() - bounds.right) / 2.0f;
bounds.top += (areaRect.height() - bounds.bottom) / 2.0f;
canvas.drawText(name, bounds.left,
bounds.top - textColor.ascent(), textColor);
// canvas.drawText(name, freeWidth + 10, 300 + 40, textColor);
freeWidth += columnWidth + gapWidth;
}
} catch (Exception e) {
e.printStackTrace();
}
int widthLeft = 180;
canvas.drawRect(new RectF(new Rect(columnsAreaWidth + 15, 30,
columnsAreaWidth + 15 + 40, 70)), green);
canvas.drawRect(new RectF(new Rect(columnsAreaWidth + 15, 90,
columnsAreaWidth + 15 + 40, 130)), grey);
canvas.drawRect(new RectF(new Rect(columnsAreaWidth + 15, 150,
columnsAreaWidth + 15 + 40, 190)), red);
grey.setStyle(Paint.Style.STROKE);
red.setStyle(Paint.Style.STROKE);
green.setStyle(Paint.Style.STROKE);
canvas.drawRect(new RectF(new Rect(columnsAreaWidth + 15, 30,
columnsAreaWidth + 15 + 40, 70)), green);
canvas.drawRect(new RectF(new Rect(columnsAreaWidth + 15, 90,
columnsAreaWidth + 15 + 40, 130)), grey);
canvas.drawRect(new RectF(new Rect(columnsAreaWidth + 15, 150,
columnsAreaWidth + 15 + 40, 190)), red);
green.setTextSize(20);
red.setTextSize(20);
grey.setTextSize(20);
Rect areaRect = new Rect(columnsAreaWidth + 15 + 40, 30,
columnsAreaWidth + widthLeft + 15, 70);
canvas.drawRect(areaRect, green);
RectF bounds = new RectF(areaRect);
bounds.right = green.measureText("Correct", 0,
new String("Correct").length());
// measure text height
bounds.bottom = green.descent() - green.ascent();
bounds.left += (areaRect.width() - bounds.right) / 2.0f;
bounds.top += (areaRect.height() - bounds.bottom) / 2.0f;
canvas.drawText("Correct", bounds.left, bounds.top - green.ascent(),
green);
Rect areaRect2 = new Rect(columnsAreaWidth + 15 + 40, 90,
columnsAreaWidth + widthLeft + 15, 130);
canvas.drawRect(areaRect2, grey);
RectF bounds2 = new RectF(areaRect2);
bounds2.right = grey.measureText("Unattempted", 0, new String(
"Unattempted").length());
// measure text height
bounds2.bottom = grey.descent() - grey.ascent();
bounds2.left += (areaRect2.width() - bounds2.right) / 2.0f;
bounds2.top += (areaRect2.height() - bounds2.bottom) / 2.0f;
canvas.drawText("Unattempted", bounds2.left,
bounds2.top - grey.ascent(), grey);
Rect areaRect3 = new Rect(columnsAreaWidth + 15 + 40, 150,
columnsAreaWidth + widthLeft + 15, 190);
canvas.drawRect(areaRect3, red);
RectF bounds3 = new RectF(areaRect3);
bounds3.right = red.measureText("Incorrect", 0,
new String("Incorrect").length());
// measure text height
bounds3.bottom = red.descent() - red.ascent();
bounds3.left += (areaRect3.width() - bounds3.right) / 2.0f;
bounds3.top += (areaRect3.height() - bounds3.bottom) / 2.0f;
canvas.drawText("Incorrect", bounds3.left, bounds3.top - red.ascent(),
red);
}
@Override
public void setLayoutParams(LayoutParams params) {
super.setLayoutParams(params);
}
}
截图：
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