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这篇文章主要讲解了“自定义视图view的折线图怎么使用”，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习“自定义视图view的折线图怎么使用”吧！
绘制折线图预览图
绘制这个折线图需要都需要哪些步骤？
注意：绘制线用到的是path，而绘制X和Y轴，我们需要知道三个坐标，这里我们用的是 canvas.drawPath(mPath,linePaint);
lift = viewSize*(1/16f); top = viewSize*(1/16f); right = viewSize*(15/16f); buttom = viewSize*(8/16f);
private void drawXY(Canvas canvas) {
/*
* 第三步，我们来通过viewSize尺寸来获取三个坐标点
* 第一个（X,Y）--(lift,top)
* 第二个（X,Y）--(lift,button)
* 第三个个（X,Y）--(right,buttom)
* */
mPath.moveTo(lift, top);
mPath.lineTo(lift, buttom);
mPath.lineTo(right,buttom);
//使用Path链接这三个坐标
canvas.drawPath(mPath,linePaint);
// 释放画布
canvas.restore();
}
答：因为我们已经知道lift，right，top， buttom。其实我们就可计算出来他们的坐标了。其实Y轴的坐标只是向右移动一点即可(lift+num,top)，x的坐标向下移动一点即可（right,top+num）,其中num是你移动多少。自己可以合理调试
private void drawXYelement(Canvas canvas) {
// 锁定画布
canvas.save();
mTextPaint.setTextSize(36);//文字大小
/*
* Y轴文字提示
* drawText(String ,x,y,TextPaint)
* (lift,top)
* */
mTextPaint.setTextAlign(Paint.Align.LEFT);//左对齐
canvas.drawText("Y",lift+20,top,mTextPaint);
/*
* X轴文字提示
* drawText(String ,right,buttom,TextPaint)
* */
mTextPaint.setTextAlign(Paint.Align.RIGHT);//右对齐
canvas.drawText("X",right,buttom+50,mTextPaint);
// 释放画布
canvas.restore();
}我们在main的xml引用此类
<tester.ermu.com.polylinedemo.XYView01 android:id="@+id/My_XYView04" android:layout_width="wrap_content" android:layout_height="500dp" android:background="#8B7500" />
编译一下效果：
package tester.ermu.com.polylinedemo;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
/**
* Created by ENZ on 2016/11/25.
* 绘制自定义view折线图
* 第一步：绘制X和Y轴,那么我们需要什么准备呢？
*/
public class XYView01 extends View {
private int viewSize;//获取空间的尺寸，也就是我们布局的尺寸大小（不知道理解的是否正确）
private Paint linePaint;// 线条画笔和点画笔
private Path mPath;// 路径对象
private TextPaint mTextPaint;// 文字画笔
float lift ;
float top ;
float right ;
float buttom ;
float PathY_X ;
float PathY_Y ;
float PathX_X ;
float PathX_Y ;
public XYView01(Context context, AttributeSet attrs) {
super(context, attrs);
//第一步，初始化对象
linePaint = new Paint();
linePaint.setColor(Color.YELLOW);//线条的颜色
linePaint.setStrokeWidth(8);//线条的宽度
linePaint.setAntiAlias(true);//取消锯齿
linePaint.setStyle(Paint.Style.STROKE);//粗线
//初始化Path
mPath = new Path();
mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG | Paint.LINEAR_TEXT_FLAG);
mTextPaint.setColor(Color.WHITE);
}
public XYView01(Context context) {
super(context);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 在我们没学习测量控件之前强制宽高一致
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//第二步骤，我们在这里获取每个用到的坐标点和尺寸
viewSize = w;//获取空间的尺寸，
Log.i("Text","viewSize:"+viewSize);
//这个是我们上下左右需要用到的坐标点
lift = viewSize*(1/16f);
top = viewSize*(1/16f);
right = viewSize*(15/16f);
buttom = viewSize*(8/16f);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 锁定画布
canvas.save();
//定义一个绘制X,Y轴的方法
drawXY(canvas);
//绘制X和Y轴上的提示文字
drawXYelement(canvas);
}
private void drawXY(Canvas canvas) {
/*
* 第三步，我们来通过viewSize尺寸来获取三个坐标点
* 第一个（X,Y）--(lift,top)
* 第二个（X,Y）--(lift,button)
* 第三个个（X,Y）--(right,buttom)
* */
mPath.moveTo(lift, top);
mPath.lineTo(lift, buttom);
mPath.lineTo(right,buttom);
//使用Path链接这三个坐标
canvas.drawPath(mPath,linePaint);
// 释放画布
canvas.restore();
}
private void drawXYelement(Canvas canvas) {
// 锁定画布
canvas.save();
mTextPaint.setTextSize(36);//文字大小
/*
* Y轴文字提示
* drawText(String ,x,y,TextPaint)
* (lift,top)
* */
mTextPaint.setTextAlign(Paint.Align.LEFT);//左对齐
canvas.drawText("Y",lift+20,top,mTextPaint);
/*
* X轴文字提示
* drawText(String ,right,buttom,TextPaint)
* */
mTextPaint.setTextAlign(Paint.Align.RIGHT);//右对齐
canvas.drawText("X",right,buttom+50,mTextPaint);
// 释放画布
canvas.restore();
}
}二、绘制我们内部的网格，那么如何绘制？
Y轴上的最大范围=(buttom - top) ; X轴的最大范围=(right - lift) ;
// 假如我们有八条数据 int count = pointFs.size(); // 计算横纵坐标刻度间隔 spaceY =(buttom - top) / count; spaceX =(right - lift) / count;
// 计算横轴数据最大值
maxX = 0;
for (int i = 0; i < count; i++) {
if (maxX < pointFs.get(i).x) {
maxX = pointFs.get(i).x;//X轴最大坐标
}
}
Log.i("Text","maxX:--"+maxX);
// 计算横轴最近的能被count整除的值
int remainderX = ((int) maxX) % divisor;
maxX = remainderX == 0 ? ((int) maxX) : divisor - remainderX + ((int) maxX);
// 计算纵轴数据最大值
maxY = 0;
for (int i = 0; i < count; i++) {
if (maxY < pointFs.get(i).y) {
maxY = pointFs.get(i).y;
}
}
Log.i("Text","maxY:--"+maxY);
// 计算纵轴最近的能被count整除的值
int remainderY = ((int) maxY) % divisor;
Log.i("Text","remainderY:--"+remainderY);（自己可以在本子上画画图就容易理解了）例如下图
// 锁定画布并设置画布透明度为75%
int sc = canvas.saveLayerAlpha(0, 0, canvas.getWidth(), canvas.getHeight(), 75, Canvas.ALL_SAVE_FLAG);
// 绘制横纵线段
for (float y = buttom - spaceY; y > top; y -= spaceY) {
Log.i("Text","y"+y);
for (float x = lift; x < right; x += spaceX) {
Log.i("Text","x"+x);
/*
* 绘制纵向线段
*/
if (y == top + spaceY) {
canvas.drawLine(x, y, x, y + spaceY * (count - 1), linePaint);
}
/*
* 绘制横向线段
*/
if (x == right - spaceX) {
canvas.drawLine(x, y, x - spaceX * (count - 1), y, linePaint);
}
}
}package tester.ermu.com.polylinedemo;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PointF;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**
* Created by ENZ on 2016/11/25.
* 绘制自定义view折线图
* 第一步：绘制X和Y轴,那么我们需要什么准备呢？
*/
public class XYView02 extends View {
private int viewSize;//获取空间的尺寸，也就是我们布局的尺寸大小（不知道理解的是否正确）
private Paint linePaint;// 线条画笔和点画笔
private Path mPath;// 路径对象
private TextPaint mTextPaint;// 文字画笔
private List<PointF> pointFs = new ArrayList<>();// 数据列表
private float[] rulerX, rulerY;// xy轴向刻度
//上下左右坐标点
private float lift ;
private float top ;
private float right ;
private float buttom ;
//Y轴文字坐标点
private float PathY_X ;
private float PathY_Y ;
//X轴文字坐标点
private float PathX_X ;
private float PathX_Y ;
private float maxX;//x轴最大值
private float maxY;//Y轴最大值
private float spaceX, spaceY;// 刻度间隔
public XYView02(Context context, AttributeSet attrs) {
super(context, attrs);
//第一步，初始化对象
linePaint = new Paint();
linePaint.setColor(Color.YELLOW);//线条的颜色
linePaint.setStrokeWidth(8);//线条的宽度
linePaint.setAntiAlias(true);//取消锯齿
linePaint.setStyle(Paint.Style.STROKE);//粗线
//初始化Path
mPath = new Path();
mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG | Paint.LINEAR_TEXT_FLAG);
mTextPaint.setColor(Color.WHITE);
//模拟数据
initData();
}
public XYView02(Context context) {
super(context);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 在我们没学习测量控件之前强制宽高一致
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//第二步骤，我们在这里获取每个用到的坐标点和尺寸
viewSize = w;//获取空间的尺寸，
Log.i("Text","viewSize:"+viewSize);
//这个是我们上下左右需要用到的坐标点
lift = viewSize*(1/16f);
top = viewSize*(1/16f);
right = viewSize*(15/16f);
buttom = viewSize*(8/16f);
//下面是绘制X,Y轴提示文字
/*
* Y轴(PathY_X,PathY_Y)
* */
PathY_X = viewSize*2/16;
PathY_Y = viewSize*1/16;
/*
* X轴(PathX_X,PathX_Y)
* */
PathX_X = viewSize*15/16f;
PathX_Y = viewSize*9/16f;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 锁定画布
canvas.save();
//定义一个绘制X,Y轴的方法
drawXY(canvas);
//绘制X和Y轴上的提示文字
drawXYelement(canvas);
}
private void initData() {
Random random = new Random();
pointFs = new ArrayList<PointF>();
for (int i = 0; i < 8; i++) {
PointF pointF = new PointF();
pointF.x = (float) (random.nextInt(100) * i);
pointF.y = (float) (random.nextInt(100) * i);
pointFs.add(pointF);
}
}
private void drawXY(Canvas canvas) {
/*
* 第三步，我们来通过viewSize尺寸来获取三个坐标点
* 第一个（X,Y）--(lift,top)
* 第二个（X,Y）--(lift,button)
* 第三个个（X,Y）--(right,buttom)
* */
mPath.moveTo(lift, top);
mPath.lineTo(lift, buttom);
mPath.lineTo(right,buttom);
//使用Path链接这三个坐标
canvas.drawPath(mPath,linePaint);
//----------------------------我们在这里添加一个绘制网格的方法----------------------------------------
drawLines(canvas);
// 释放画布
canvas.restore();
}
private void drawLines(Canvas canvas) {
// 重置线条画笔，因为是细线，所有我这里设置了2。
linePaint.setStrokeWidth(2);
// 假如我们有八条数据
int count = pointFs.size();
// 计算横纵坐标刻度间隔
spaceY =(buttom - top) / count;
spaceX =(right - lift) / count;
Log.i("Text","spaceY:--"+spaceY);
Log.i("Text","spaceX:--"+spaceX);
// 计算除数的值为数据长度减一，8个数据，7条线。
int divisor = count - 1;
Log.i("Text","divisor:--"+divisor);
// 计算横轴数据最大值
maxX = 0;
for (int i = 0; i < count; i++) {
if (maxX < pointFs.get(i).x) {
maxX = pointFs.get(i).x;//X轴最大坐标
}
}
Log.i("Text","maxX:--"+maxX);
// 计算横轴最近的能被count整除的值
int remainderX = ((int) maxX) % divisor;
maxX = remainderX == 0 ? ((int) maxX) : divisor - remainderX + ((int) maxX);
// 计算纵轴数据最大值
maxY = 0;
for (int i = 0; i < count; i++) {
if (maxY < pointFs.get(i).y) {
maxY = pointFs.get(i).y;
}
}
Log.i("Text","maxY:--"+maxY);
// 计算纵轴最近的能被count整除的值
int remainderY = ((int) maxY) % divisor;
Log.i("Text","remainderY:--"+remainderY);
if(remainderY == 0&&maxY==0){
maxY=0;
}else {
maxY=divisor - remainderY + ((int) maxY);
Log.i("Text","maxY11111111111:--"+maxY);
}
//
// // 生成横轴刻度值
// rulerX = new float[count];
// for (int i = 0; i < count; i++) {
// rulerX[i] = maxX / divisor * i;
// }
// Log.i("Text","rulerX:--"+rulerX);
//
// // 生成纵轴刻度值
// rulerY = new float[count];
// for (int i = 0; i < count; i++) {
// rulerY[i] = maxY / divisor * i;
// }
// Log.i("Text","rulerY:--"+rulerY);
// 锁定画布并设置画布透明度为75%
int sc = canvas.saveLayerAlpha(0, 0, canvas.getWidth(), canvas.getHeight(), 75, Canvas.ALL_SAVE_FLAG);
// 绘制横纵线段
for (float y = buttom - spaceY; y > top; y -= spaceY) {
Log.i("Text","y"+y);
for (float x = lift; x < right; x += spaceX) {
Log.i("Text","x"+x);
/*
* 绘制纵向线段
*/
if (y == top + spaceY) {
canvas.drawLine(x, y, x, y + spaceY * (count - 1), linePaint);
}
/*
* 绘制横向线段
*/
if (x == right - spaceX) {
canvas.drawLine(x, y, x - spaceX * (count - 1), y, linePaint);
}
}
}
// 还原画布
canvas.restoreToCount(sc);
}
private void drawXYelement(Canvas canvas) {
// 锁定画布
canvas.save();
mTextPaint.setTextSize(36);//文字大小
/*
* Y轴文字提示
* drawText(String ,x,y,TextPaint)
* (lift,top)
* */
mTextPaint.setTextAlign(Paint.Align.LEFT);//左对齐
canvas.drawText("Y",lift+20,top,mTextPaint);
/*
* X轴文字提示
* drawText(String ,right,buttom,TextPaint)
* */
mTextPaint.setTextAlign(Paint.Align.RIGHT);//右对齐
canvas.drawText("X",right,buttom+50,mTextPaint);
// 释放画布
canvas.restore();
}
}
int num = 0;//用于给X轴赋值
int num_y = 0;//用于给Y轴赋值
for (float y = buttom - spaceY; y > top; y -= spaceY) {
for (float x = lift; x < right; x += spaceX) {
mTextPaint.setTextSize(28);
/*
* 绘制横轴刻度数值
*/
if (y == buttom - spaceY) {
canvas.drawText(""+index_x[num], x-12, buttom+(top/3), mTextPaint);
Log.i("Text","num-"+num);
}
/*
* 绘制纵轴刻度数值
* 简单来说就是，Y轴上的坐标点，X轴是恒定不变的，但是Y轴是变化的（buttom - 间距）+10的距离向上绘制
*/
if (x == lift) {
canvas.drawText(""+index_y[num_y], lift - (lift/2), y + 10, mTextPaint);
Log.i("Text","lift:"+lift);
Log.i("Text","lift - (1/16):"+(lift - (lift/2)));
}
num++;
}
num_y++;
}
}2、这个没什么说的，仔细在本子上画一下就明白了，也有注释;附上全部代码
package tester.ermu.com.polylinedemo;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PointF;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
/**/
public class XYView03 extends View {
private int viewSize;//获取空间的尺寸，也就是我们布局的尺寸大小（不知道理解的是否正确）
private Paint linePaint;// 线条画笔和点画笔
private Path mPath;// 路径对象
private TextPaint mTextPaint;// 文字画笔
private List<PointF> pointFs = new ArrayList<>();// 数据列表
private float[] rulerX, rulerY;// xy轴向刻度
//上下左右坐标点
private float lift ;
private float top ;
private float right ;
private float buttom ;
//Y轴文字坐标点
private float PathY_X ;
private float PathY_Y ;
//X轴文字坐标点
private float PathX_X ;
private float PathX_Y ;
private float maxX;//x轴最大值
private float maxY;//Y轴最大值
private float spaceX, spaceY;// 刻度间隔
/*
* 绘制X和Y轴对应的文字
* */
int[] index_x = {0,1,2,3,4,5,6,7};
int[] index_y = {0,1,2,3,4,5,6,7};
public XYView03(Context context, AttributeSet attrs) {
super(context, attrs);
//第一步，初始化对象
linePaint = new Paint();
linePaint.setColor(Color.YELLOW);//线条的颜色
linePaint.setStrokeWidth(8);//线条的宽度
linePaint.setAntiAlias(true);//取消锯齿
linePaint.setStyle(Paint.Style.STROKE);//粗线
//初始化Path
mPath = new Path();
mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG | Paint.LINEAR_TEXT_FLAG);
mTextPaint.setColor(Color.WHITE);
//模拟数据
initData();
}
public XYView03(Context context) {
super(context);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 在我们没学习测量控件之前强制宽高一致
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//第二步骤，我们在这里获取每个用到的坐标点和尺寸
viewSize = w;//获取空间的尺寸，
Log.i("Text","viewSize:"+viewSize);
//这个是我们上下左右需要用到的坐标点
lift = viewSize*(2/16f);
top = viewSize*(2/16f);
right = viewSize*(15/16f);
buttom = viewSize*(8/16f);
//下面是绘制X,Y轴提示文字
/*
* Y轴(PathY_X,PathY_Y)
* */
PathY_X = viewSize*2/16;
PathY_Y = viewSize*1/16;
/*
* X轴(PathX_X,PathX_Y)
* */
PathX_X = viewSize*15/16f;
PathX_Y = viewSize*9/16f;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 锁定画布
canvas.save();
//定义一个绘制X,Y轴的方法
drawXY(canvas);
//绘制X和Y轴上的提示文字
drawXYelement(canvas);
}
private void initData() {
Random random = new Random();
pointFs = new ArrayList<PointF>();
for (int i = 0; i < 8; i++) {
PointF pointF = new PointF();
pointF.x = (float) (random.nextInt(100) * i);
pointF.y = (float) (random.nextInt(100) * i);
pointFs.add(pointF);
}
}
private void drawXY(Canvas canvas) {
/*
* 第三步，我们来通过viewSize尺寸来获取三个坐标点
* 第一个（X,Y）--(lift,top)
* 第二个（X,Y）--(lift,button)
* 第三个个（X,Y）--(right,buttom)
* */
mPath.moveTo(lift, top);
mPath.lineTo(lift, buttom);
mPath.lineTo(right,buttom);
//使用Path链接这三个坐标
canvas.drawPath(mPath,linePaint);
//----------------------------我们在这里添加一个绘制网格的方法----------------------------------------
drawLines(canvas);
// 释放画布
canvas.restore();
}
private void drawLines(Canvas canvas) {
Log.i("Text","1111111111111111111");
/*
* 1、我们需要知道X,Y轴的最大值是多少
* 2、我们需要知道我们在X,Y轴分别有多少个点，然后每个点之间的间距是多少
* 3、绘制网格线
* */
// 重置线条画笔，因为是细线，所有我这里设置了2。
linePaint.setStrokeWidth(2);
// 假如我们有八条数据
int count = pointFs.size();
// 计算横纵坐标刻度间隔
spaceY =(buttom - top) / count;
spaceX =(right - lift) / count;
Log.i("Text","spaceY:--"+spaceY);
Log.i("Text","spaceX:--"+spaceX);
// 计算除数的值为数据长度减一，8个数据，7条线。
int divisor = count - 1;
Log.i("Text","divisor:--"+divisor);
// 计算横轴数据最大值
maxX = 0;
for (int i = 0; i < count; i++) {
if (maxX < pointFs.get(i).x) {
maxX = pointFs.get(i).x;//X轴最大坐标
}
}
Log.i("Text","maxX:--"+maxX);
// 计算横轴最近的能被count整除的值
int remainderX = ((int) maxX) % divisor;
maxX = remainderX == 0 ? ((int) maxX) : divisor - remainderX + ((int) maxX);
// 计算纵轴数据最大值
maxY = 0;
for (int i = 0; i < count; i++) {
if (maxY < pointFs.get(i).y) {
maxY = pointFs.get(i).y;
}
}
Log.i("Text","maxY:--"+maxY);
// 计算纵轴最近的能被count整除的值
int remainderY = ((int) maxY) % divisor;
Log.i("Text","remainderY:--"+remainderY);
if(remainderY == 0&&maxY==0){
maxY=0;
}else {
maxY=divisor - remainderY + ((int) maxY);
Log.i("Text","maxY11111111111:--"+maxY);
}
// 锁定画布并设置画布透明度为75%
int sc = canvas.saveLayerAlpha(0, 0, canvas.getWidth(), canvas.getHeight(), 75, Canvas.ALL_SAVE_FLAG
// 绘制横纵线段
for (float y = buttom - spaceY; y > top; y -= spaceY) {
Log.i("Text","y"+y);
for (float x = lift; x < right; x += spaceX) {
Log.i("Text","x"+x);
/*
* 绘制纵向线段
*/
if (y == top + spaceY) {
canvas.drawLine(x, y, x, y + spaceY * (count - 1), linePaint);
}
/*
* 绘制横向线段
*/
if (x == right - spaceX) {
canvas.drawLine(x, y, x - spaceX * (count - 1), y, linePaint);
}
}
}
// 还原画布
canvas.restoreToCount(sc);
int num = 0;//用于给X轴赋值
int num_y = 0;//用于给Y轴赋值
for (float y = buttom - spaceY; y > top; y -= spaceY) {
for (float x = lift; x < right; x += spaceX) {
mTextPaint.setTextSize(28);
/*
* 绘制横轴刻度数值
*/
if (y == buttom - spaceY) {
canvas.drawText(""+index_x[num], x-12, buttom+(top/3), mTextPaint);
Log.i("Text","num-"+num);
}
/*
* 绘制纵轴刻度数值
* 简单来说就是，Y轴上的坐标点，X轴是恒定不变的，但是Y轴是变化的（buttom - 间距）+10的距离向上绘制
*/
if (x == lift) {
canvas.drawText(""+index_y[num_y], lift - (lift/2), y + 10, mTextPaint);
Log.i("Text","lift:"+lift);
Log.i("Text","lift - (1/16):"+(lift - (lift/2)));
}
num++;
}
num_y++;
}
}
private void drawXYelement(Canvas canvas) {
// 锁定画布
canvas.save();
mTextPaint.setTextSize(36);//文字大小
/*
* Y轴文字提示
* drawText(String ,x,y,TextPaint)
* (lift,top)
* */
mTextPaint.setTextAlign(Paint.Align.LEFT);//左对齐
canvas.drawText("Y",PathY_X,PathY_Y,mTextPaint);
/*
* X轴文字提示
* drawText(String ,right,buttom,TextPaint)
* */
mTextPaint.setTextAlign(Paint.Align.RIGHT);//右对齐
canvas.drawText("X",PathX_X,PathX_Y,mTextPaint);
// 释放画布
canvas.restore();
}
}
private void drawbitmaps(Canvas canvas) {
/*
我们给我们的区域先绘制一个颜色模块，做法很简单，生成一个图片即可，然后透明度设置下
* Bitmap.createBitmap()
* 关于他的6个方法，可查看博客：http://www.cnblogs.com/wangxiuheng/p/4503610.html
* */
Bitmap mBitmap = Bitmap.createBitmap((int)(right-lift-spaceX),(int)(buttom-top-spaceY),Bitmap.Config.ARGB_8888);
mCanvas.setBitmap(mBitmap);
/*
* 为画布填充一个半透明的红色
* drawARGB(a,r,g,b)
* a:透明度
* r:红色
* g:绿色
* b:蓝色
* */
mCanvas.drawARGB(55, 255, 0, 0);
// 重置曲线
mPath.reset();
// 将mBitmap绘制到原来的canvas
canvas.drawBitmap(mBitmap, lift, top+spaceY , null);
//绘制我们的坐标点
// drawText(canvas);
} @Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 锁定画布
canvas.save();
//定义一个绘制X,Y轴的方法
drawXY(canvas);
//绘制X和Y轴上的提示文字
drawXYelement(canvas);
//最后遮罩层图
drawbitmaps(canvas);
//
}
注意：，当然是根据我们传递过来的数据了，切记，在没有数据的时候，我默认生成的8个数据，为了避免Main传递过来的是空数据
private void initData() {
Random random = new Random();
pointFs = new ArrayList<PointF>();
for (int i = 0; i < 8; i++) {
PointF pointF = new PointF();
pointF.x = (float) (random.nextInt(60) * i);
pointF.y = (float) (random.nextInt(60) * i);
pointFs.add(pointF);
}
}package tester.ermu.com.polylinedemo;
import android.graphics.PointF;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private XYView05 xyview05;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
xyview05 = (XYView05) findViewById(R.id.My_XYView04);
List<PointF> pointFs = new ArrayList<PointF>();
pointFs.add(new PointF(0.3F, 0.5F));
pointFs.add(new PointF(1F, 22.7F));
pointFs.add(new PointF(2F, 33.5F));
pointFs.add(new PointF(3F, 36.2F));
pointFs.add(new PointF(4F, 18.8F));
pointFs.add(new PointF(5F, 15.5F));
pointFs.add(new PointF(6F, 24.2F));
pointFs.add(new PointF(7F, 52.5F));
xyview05.setData(pointFs, "X轴提示文字", "Y轴提示文字",MainActivity.this);
}
}public synchronized void setData(List<PointF> pointFs, String signX, String signY, Activity activity) {
/*
* 数据为空直接提示下
*/
if (null == pointFs || pointFs.size() == 0)
throw new IllegalArgumentException("No data to display !");
/*
* 控制数据长度不超过10个
* 对于折线图来说数据太多就没必要用折线图表示了而是使用散点图
*/
if (pointFs.size() > 10)
throw new IllegalArgumentException("The data is too long to display !");
// 设置数据并重绘视图
this.pointFs = pointFs;
this.context = activity;
invalidate();
} private void drawText(Canvas canvas) {
Paint pointPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
pointPaint.setStyle(Paint.Style.FILL);//焦点的类型
pointPaint.setColor(Color.WHITE);//焦点的颜色
if(pointFs.size()==0){
Toast.makeText(context,"暂无折现数据",Toast.LENGTH_SHORT).show();
}else {
/*
* 生成Path和绘制Point
*/
for (int i = 0; i < pointFs.size(); i++) {
// 计算x坐标
float x = mCanvas.getWidth() / maxX * pointFs.get(i).x;
// 计算y坐标
float y = mCanvas.getHeight() / maxY * pointFs.get(i).y;
y = mCanvas.getHeight() - y;
// 绘制小点点
mCanvas.drawCircle(x, y, 6, pointPaint);
/*
* 如果是第一个点则将其设置为Path的起点
*/
if (i == 0) {
mPath.moveTo(x, y);
}
// 连接各点
mPath.lineTo(x, y);
}
// 设置PathEffect
linePaint.setPathEffect(new CornerPathEffect(10));
// 重置线条宽度
linePaint.setStrokeWidth(4);
// 将Path绘制到我们自定的Canvas上
mCanvas.drawPath(mPath, linePaint);
}
} // 生成横轴刻度值
rulerX = new float[count];
for (int i = 0; i < count; i++) {
rulerX[i] = maxX / divisor * i;
}
// Log.i("Text","rulerX:--"+rulerX);
// 生成纵轴刻度值
rulerY = new float[count];
for (int i = 0; i < count; i++) {
rulerY[i] = maxY / divisor * i;
}package tester.ermu.com.polylinedemo;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.CornerPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PointF;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
/**
* Created by ENZ on 2016/11/25.
*/
public class XYView05 extends View {
private Context context;
private int viewSize;//获取空间的尺寸，也就是我们布局的尺寸大小（不知道理解的是否正确）
private Paint linePaint;// 线条画笔和点画笔
private Canvas mCanvas;
private Path mPath;// 路径对象
private TextPaint mTextPaint;// 文字画笔
private List<PointF> pointFs = new ArrayList<>();// 数据列表
private float[] rulerX, rulerY;// xy轴向刻度
//上下左右坐标点
private float lift ;
private float top ;
private float right ;
private float buttom ;
//Y轴文字坐标点
private float PathY_X ;
private float PathY_Y ;
//X轴文字坐标点
private float PathX_X ;
private float PathX_Y ;
private float maxX;//x轴最大值
private float maxY;//Y轴最大值
private float spaceX, spaceY;// 刻度间隔
/*
* 绘制X和Y轴对应的文字
* */
String[] index_x = {"周一","周二","周三","周四","周五","周六","周日","",""};
int[] index_y = {1,2,3,4,5,6,7,8};
public XYView05(Context context, AttributeSet attrs) {
super(context, attrs);
//第一步，初始化对象
linePaint = new Paint();
linePaint.setColor(Color.YELLOW);//线条的颜色
linePaint.setStrokeWidth(8);//线条的宽度
linePaint.setAntiAlias(true);//取消锯齿
linePaint.setStyle(Paint.Style.STROKE);//粗线
//初始化Path
mPath = new Path();
mTextPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG | Paint.LINEAR_TEXT_FLAG);
mTextPaint.setColor(Color.WHITE);
mCanvas = new Canvas();
//模拟数据
initData();
}
public XYView05(Context context) {
super(context);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// 在我们没学习测量控件之前强制宽高一致
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//第二步骤，我们在这里获取每个用到的坐标点和尺寸
viewSize = w;//获取空间的尺寸，
Log.i("Text","viewSize:"+viewSize);
//这个是我们上下左右需要用到的坐标点
lift = viewSize*(2/16f);
top = viewSize*(2/16f);
right = viewSize*(15/16f);
buttom = viewSize*(8/16f);
//下面是绘制X,Y轴提示文字
/*
* Y轴(PathY_X,PathY_Y)
* */
PathY_X = viewSize*2/16;
PathY_Y = viewSize*1/16;
/*
* X轴(PathX_X,PathX_Y)
* */
PathX_X = viewSize*15/16f;
PathX_Y = viewSize*9/16f;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// 锁定画布
canvas.save();
//定义一个绘制X,Y轴的方法
drawXY(canvas);
//绘制X和Y轴上的提示文字
drawXYelement(canvas);
//最后绘制我们的点和线
drawbitmaps(canvas);
//
}
private void initData() {
pointFs = new ArrayList<PointF>();
for (int i = 0; i < 8; i++) {
PointF pointF = new PointF();
pointF.x = (float) (0);
pointF.y = (float) (index_y[i]);
pointFs.add(pointF);
}
}
private void drawXY(Canvas canvas) {
/*
* 第三步，我们来通过viewSize尺寸来获取三个坐标点
* 第一个（X,Y）--(lift,top)
* 第二个（X,Y）--(lift,button)
* 第三个个（X,Y）--(right,buttom)
* */
mPath.moveTo(lift, top);
mPath.lineTo(lift, buttom);
mPath.lineTo(right,buttom);
//使用Path链接这三个坐标
canvas.drawPath(mPath,linePaint);
//----------------------------我们在这里添加一个绘制网格的方法----------------------------------------
drawLines(canvas);
// 释放画布
canvas.restore();
}
private void drawLines(Canvas canvas) {
/*
* 1、我们需要知道X,Y轴的最大值是多少
* 2、我们需要知道我们在X,Y轴分别有多少个点，然后每个点之间的间距是多少
* 3、绘制网格线
* */
// 重置线条画笔，因为是细线，所有我这里设置了2。
linePaint.setStrokeWidth(2);
// 假如我们有八条数据
int count = pointFs.size();
// 计算横纵坐标刻度间隔
spaceY =(buttom - top) / count;
spaceX =(right - lift) / count;
// 计算除数的值为数据长度减一，8个数据，7条线。
int divisor = count - 1;
// 计算横轴数据最大值
maxX = 0;
for (int i = 0; i < count; i++) {
if (maxX < pointFs.get(i).x) {
maxX = pointFs.get(i).x;//X轴最大坐标
}
}
Log.i("Text","maxX:--"+maxX);
// 计算横轴最近的能被count整除的值
int remainderX = ((int) maxX) % divisor;
maxX = remainderX == 0 ? ((int) maxX) : divisor - remainderX + ((int) maxX);
// 计算纵轴数据最大值
maxY = 0;
for (int i = 0; i < count; i++) {
if (maxY < pointFs.get(i).y) {
maxY = pointFs.get(i).y;
}
}
Log.i("Text","maxY:--"+maxY);
// 计算纵轴最近的能被count整除的值
int remainderY = ((int) maxY) % divisor;
// Log.i("Text","remainderY:--"+remainderY);
if(remainderY == 0&&maxY==0){
maxY=0;
}else {
maxY=divisor - remainderY + ((int) maxY);
}
// 生成横轴刻度值
rulerX = new float[count];
for (int i = 0; i < count; i++) {
rulerX[i] = maxX / divisor * i;
}
// Log.i("Text","rulerX:--"+rulerX);
// 生成纵轴刻度值
rulerY = new float[count];
for (int i = 0; i < count; i++) {
rulerY[i] = maxY / divisor * i;
}
// 锁定画布并设置画布透明度为75%
int sc = canvas.saveLayerAlpha(0, 0, canvas.getWidth(), canvas.getHeight(), 75, Canvas.ALL_SAVE_FLAG);
// 绘制横纵线段
for (float y = buttom - spaceY; y > top; y -= spaceY) {
Log.i("Text","y"+y);
for (float x = lift; x < right; x += spaceX) {
Log.i("Text","x"+x);
/*
* 绘制纵向线段
*/
if (y == top + spaceY) {
canvas.drawLine(x, y, x, y + spaceY * (count - 1), linePaint);
}
/*
* 绘制横向线段
*/
if (x == right - spaceX) {
canvas.drawLine(x, y, x - spaceX * (count - 1), y, linePaint);
}
}
}
// 还原画布
canvas.restoreToCount(sc);
int num = 0;//用于给X轴赋值
int num_y = 0;//用于给Y轴赋值
for (float y = buttom - spaceY; y > top; y -= spaceY) {
for (float x = lift; x < right; x += spaceX) {
mTextPaint.setTextSize(28);
/*
* 绘制横轴刻度数值
*/
if (y == buttom - spaceY) {
canvas.drawText(String.valueOf(index_x[num]), x-12, buttom+(top/3), mTextPaint);
}
/*
* 绘制纵轴刻度数值
* 简单来说就是，Y轴上的坐标点，X轴是恒定不变的，但注意是Y轴是变化的
*/
if (x == lift) {
canvas.drawText((int)(rulerY[num_y+1])+"", lift - (lift/2), y + 10, mTextPaint);
}
num++;
}
num_y++;
}
}
private void drawXYelement(Canvas canvas) {
// 锁定画布
canvas.save();
mTextPaint.setTextSize(36);//文字大小
/*
* Y轴文字提示
* drawText(String ,x,y,TextPaint)
* (lift,top)
* */
mTextPaint.setTextAlign(Paint.Align.LEFT);//左对齐
canvas.drawText("Y",PathY_X,PathY_Y,mTextPaint);
/*
* X轴文字提示
* drawText(String ,right,buttom,TextPaint)
* */
mTextPaint.setTextAlign(Paint.Align.RIGHT);//右对齐
canvas.drawText("X",PathX_X,PathX_Y,mTextPaint);
// 释放画布
canvas.restore();
}
private void drawbitmaps(Canvas canvas) {
/*
我们给我们的区域先绘制一个颜色模块，做法很简单，生成一个图片即可，然后透明度设置下
* Bitmap.createBitmap()
* 关于他的6个方法，可查看博客：http://www.cnblogs.com/wangxiuheng/p/4503610.html
* */
Bitmap mBitmap = Bitmap.createBitmap((int)(right-lift-spaceX),(int)(buttom-top-spaceY),Bitmap.Config.ARGB_8888);
mCanvas.setBitmap(mBitmap);
/*
* 为画布填充一个半透明的红色
* drawARGB(a,r,g,b)
* a:透明度
* r:红色
* g:绿色
* b:蓝色
* */
mCanvas.drawARGB(55, 255, 0, 0);
// 重置曲线
mPath.reset();
// 将mBitmap绘制到原来的canvas
canvas.drawBitmap(mBitmap, lift, top+spaceY , null);
//绘制我们的坐标点
drawText(canvas);
}
private void drawText(Canvas canvas) {
Paint pointPaint = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.DITHER_FLAG);
pointPaint.setStyle(Paint.Style.FILL);//焦点的类型
pointPaint.setColor(Color.WHITE);//焦点的颜色
if(pointFs.size()==0){
Toast.makeText(context,"暂无折现数据",Toast.LENGTH_SHORT).show();
}else {
/*
* 生成Path和绘制Point
*/
for (int i = 0; i < pointFs.size(); i++) {
// 计算x坐标
float x = mCanvas.getWidth() / maxX * pointFs.get(i).x;
// 计算y坐标
float y = mCanvas.getHeight() / maxY * pointFs.get(i).y;
y = mCanvas.getHeight() - y;
// 绘制小点点
mCanvas.drawCircle(x, y, 6, pointPaint);
/*
* 如果是第一个点则将其设置为Path的起点
*/
if (i == 0) {
mPath.moveTo(x, y);
}
// 连接各点
mPath.lineTo(x, y);
}
// 设置PathEffect
linePaint.setPathEffect(new CornerPathEffect(10));
// 重置线条宽度
linePaint.setStrokeWidth(4);
// 将Path绘制到我们自定的Canvas上
mCanvas.drawPath(mPath, linePaint);
}
}
public synchronized void setData(List<PointF> pointFs, String signX, String signY, Activity activity) {
/*
* 数据为空直接GG
*/
if (null == pointFs || pointFs.size() == 0)
throw new IllegalArgumentException("No data to display !");
/*
* 控制数据长度不超过10个
* 对于折线图来说数据太多就没必要用折线图表示了而是使用散点图
*/
if (pointFs.size() > 10)
throw new IllegalArgumentException("The data is too long to display !");
// 设置数据并重绘视图
this.pointFs = pointFs;
this.context = activity;
invalidate();
}
}感谢各位的阅读，以上就是“自定义视图view的折线图怎么使用”的内容了，经过本文的学习后，相信大家对自定义视图view的折线图怎么使用这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是亿速云，小编将为大家推送更多相关知识点的文章，欢迎关注！
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