[转]通过创建一个位图的XY Chart来学习Android绘图类Rect,Paint,Bitmap,Canvas（附源码）...
本文转自：http://www.cnblogs.com/salam/archive/2010/11/10/1873437.html
绘制一个XY集是一种很常见的任务,基于Android平台的绘制很简单，它让所有的GUI在XML中定义的（虽然它也可以通过代码创建）模型是相当不错的。大部分的图形处理一个样本查看，但在大多数情况下，图应该是一个部分的实施走上屏幕布局XML定义为一所以在这里展示我们ImageView布局对象。
在Android环境中，有一整套程序的图形通常是位图实现像素，Canvas是用来绘制位图的画布，通过这一点我们可以得出元（文字，线条等）它描述了漆的颜色，款式等。
下面是效果图
图形界面我们通过Xml定义。
1.XML的GUI布局
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:background="#4B088A">
<TableRow android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="20px">
<TextView
android:id="@+id/some"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Some layout items here"
android:layout_marginLeft="10px"
android:layout_marginRight="10px"
android:textColor="#ff8000"
android:textStyle="bold"
/>
</TableRow>
<View
android:layout_width="fill_parent"
android:layout_height="1dip"
android:background="#FFE6E6E6"
/>
<TableRow>
<ImageView
android:id="@+id/testy_img"
android:layout_marginLeft="20px"
android:padding="20px"
/>
</TableRow>
<View
android:layout_width="fill_parent"
android:layout_height="1dip"
android:background="#FFE6E6E6" />
<TableRow android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:padding="20px">
<TextView
android:id="@+id/more"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="More layout items here"
android:layout_marginLeft="10px"
android:layout_marginRight="10px"
android:textColor="#ff8000"
android:textStyle="bold"
/>
</TableRow>
</TableLayout>
这个布局文件是TableLayout布局，它定义了三行，行之间通过一条线割开
2.图表的实现
为了实现我们的图表，我们首先创建一个位图，然后关联到我们的布局文件，有了位图，我们就可以绘制图表，做缩放，色彩和数据显示 等效果。
2.1绘制位图
首先我们使布局连接到XML对象的，那么我们创建位图。我们通过quicky_XY方法来实现所有的绘制，最后显示在屏幕上。
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView image = (ImageView) findViewById(R.id.testy_img);
Bitmap emptyBmap = Bitmap.createBitmap(250, 200, Config.ARGB_8888);
int width = emptyBmap.getWidth();
int height = emptyBmap.getHeight();
Bitmap charty = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
charty = quicky_XY(emptyBmap);
image.setImageBitmap(charty);
}
2.2绘制网格
有了位图后，将它与Canvas相关联
Canvas canvas = new Canvas(bitmap)
然后将所有的元素绘制到Canvas上，我们需要定义一些用于放置标签和数据点空间的网格。
public static void draw_the_grid(Canvas this_g, Vector these_labels) {
double rounded_max = 0.0;
double rounded_min = 0.0;
double rounded_max_temp;
Object curElt;
String[] cur_elt_array;
int left_margin_d, right_margin_d;
if (draw_only_this_idx == -1)
curElt = these_labels.elementAt(0); // default it to 1st one if non
// set
else
curElt = these_labels.elementAt(draw_only_this_idx); // now just the
// 1st elt
cur_elt_array = (String[]) curElt;
rounded_max = get_ceiling_or_floor(
Double.parseDouble(cur_elt_array[2]), true);
rounded_min = get_ceiling_or_floor(
Double.parseDouble(cur_elt_array[3]), false);
// ok so now we have the max value of the set just get a cool ceiling
// and we go on
final Paint paint = new Paint();
paint.setTextSize(15);
left_margin_d = getCurTextLengthInPixels(paint, Double
.toString(rounded_max));
// keep the position for later drawing -- leave space for the legend
int p_height = 170;
int p_width = 220;
int[] tmp_draw_sizes = { 2 + left_margin_d, 25,
p_width - 2 - left_margin_d, p_height - 25 - 5 };
drawSizes = tmp_draw_sizes; // keep it for later processing
// with the mzrgins worked out draw the plotting grid
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.WHITE);
// Android does by coords
this_g
.drawRect(drawSizes[0], drawSizes[1], drawSizes[0]
+ drawSizes[2], drawSizes[1] + drawSizes[3], paint);
paint.setColor(Color.GRAY);
// finally draw the grid
paint.setStyle(Paint.Style.STROKE);
this_g
.drawRect(drawSizes[0], drawSizes[1], drawSizes[0]
+ drawSizes[2], drawSizes[1] + drawSizes[3], paint);
for (int i = 1; i < 5; i++) {
this_g.drawLine(drawSizes[0],
drawSizes[1] + (i * drawSizes[3] / 5), drawSizes[0]
+ drawSizes[2], drawSizes[1]
+ (i * drawSizes[3] / 5), paint);
this_g.drawLine(drawSizes[0] + (i * drawSizes[2] / 5),
drawSizes[1], drawSizes[0] + (i * drawSizes[2] / 5),
drawSizes[1] + drawSizes[3], paint);
}
// good for one value
print_axis_values_4_grid(this_g, cur_elt_array[1], Double
.toString(rounded_max), Double.toString(rounded_min),
cur_elt_array[0], 2, 0);
} // --- end of draw_grid ---
2.3绘图和缩放
这些数据点需要一到屏幕上的坐标数据范围正确的映射遍历数据点和调用drawLine接连两个点会完成我们的图表。数据点通过数据为载体，现在将调用plot_array_list
private static Point scale_point(int this_x , double this_y , Point drawPoint ,
int scr_x , int scr_y , int scr_width , int src_height ,
double maxX , double minX , double maxY , double minY )
{
int temp_x, temp_y;
Point temp = new Point();
if (maxY == minY) //skip bad data
return null;
//don't touch it if is nothing
try
{
temp_x = scr_x + (int)( ((double)this_x - minX) *
((double)scr_width / (maxX - minX)) );
temp_y = scr_y + (int)( (maxY - this_y) *
((double)src_height / (maxY - minY)) );
temp.x = temp_x;
temp.y= temp_y;
drawPoint = temp;
}
catch (Exception e)
{
return (null);
}
return temp;
} // --- end of scale_point --
public static boolean plot_array_list(Canvas this_g, Vector this_array_list ,
Vector these_labels , String this_title , int only_this_idx )
{
int idx;
int lRow ;
int nParms;
int i, points_2_plot, shifted_idx ;
int prev_x, prev_y ;
int cur_x=0, cur_y=0 ;
//Dim ShowMarker As Object
Point cur_point = new Point();
cur_point.set(0,0);
double cur_maxX, cur_minX, cur_maxY=20, cur_minY=0, cur_rangeY;
int cur_start_x, cur_points_2_plot;
int POINTS_TO_CHANGE = 30;
double cur_OBD_val;
//Object curElt;
String curElt;
String[] cur_elt_array;
Object curElt2;
String[] cur_elt_array2;
final Paint paint = new Paint();
try // catch in this block for some thing
{
points_2_plot = this_array_list.size();
{
cur_start_x = 0;
cur_points_2_plot = points_2_plot;
cur_maxX = cur_points_2_plot;
cur_minX = 0;
}
//'Create the plot points for this series from the ChartPoints array:
curElt = (String)this_array_list.elementAt(0);
//the lines have to come out good
paint.setStyle(Paint.Style.STROKE);
//
//for( nParms = 0 ; nParms < cur_elt_array.length ; nParms++ )
nParms = only_this_idx;
{
//get cur item labels
curElt2 = these_labels.elementAt(nParms);
cur_elt_array2 = (String[]) curElt2;
cur_maxY = get_ceiling_or_floor
(Double.parseDouble(cur_elt_array2[2]) , true);
cur_minY = get_ceiling_or_floor
(Double.parseDouble(cur_elt_array2[3]) , false);
cur_points_2_plot = this_array_list.size();
cur_maxX = cur_points_2_plot;
curElt = (String)this_array_list.elementAt(0);
cur_OBD_val = Double.parseDouble( curElt);
cur_point = scale_point(0, cur_OBD_val, cur_point,
drawSizes[0], drawSizes[1], drawSizes[2], drawSizes[3],
cur_maxX, cur_minX, cur_maxY,
cur_minY); //'(CInt(curAxisValues.Mins(nParms - 2) / 5) + 1) * 5)
cur_x = cur_point.x;
cur_y = cur_point.y;
paint.setColor(Color.GREEN);
// the point is only cool when samples are low
if ( cur_points_2_plot < POINTS_TO_CHANGE)
this_g.drawRect(cur_x-2, cur_y-2, cur_x-2 + 4,
cur_y-2+ 4 , paint);
prev_x = cur_x;
prev_y = cur_y;
//'go and plot point for this parm -- pont after the 1st one
for (lRow = cur_start_x +1 ; lRow< cur_start_x +
cur_points_2_plot -1 ; lRow++)
{
curElt = (String)this_array_list.elementAt(lRow);
cur_OBD_val = Double.parseDouble( curElt);
//'work out an approx if cur Y values not avail(e.g. nothing)
// if (! (cur_elt_array[nParms ] == null ) ) //skip bad one
if( cur_OBD_val == Double.NaN) continue; //skip bad one
{
cur_point=scale_point(lRow, cur_OBD_val, cur_point,
drawSizes[0], drawSizes[1],
drawSizes[2], drawSizes[3],
cur_maxX, cur_minX, cur_maxY, cur_minY);
cur_x = cur_point.x;
cur_y = cur_point.y;
if ( cur_points_2_plot < POINTS_TO_CHANGE)
this_g.drawRect(cur_x-2, cur_y-2, cur_x-2 +4,
cur_y-2 + 4, paint );
this_g.drawLine( prev_x, prev_y, cur_x, cur_y, paint);
prev_x = cur_x;
prev_y = cur_y;
} // ' if end of this_array(lRow, nParms - 1)<> nothing
} // end of for lrow
} // end of for nParmns
//this_g.invalidate();
return( true);
}
catch (Exception e)
{
return( false);
}
} // --- end of plot_array_list --
Java完整代码：
package com.wjq.chart;
import java.util.Vector;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.graphics.Bitmap.Config;
import android.graphics.Paint.FontMetrics;
import android.os.Bundle;
import android.widget.ImageView;
public class Main extends Activity {
static int draw_only_this_idx = -1;
static int[] drawSizes;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ImageView image = (ImageView) findViewById(R.id.testy_img);
Bitmap emptyBmap = Bitmap.createBitmap(250, 200, Config.ARGB_8888);
int width = emptyBmap.getWidth();
int height = emptyBmap.getHeight();
Bitmap charty = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
charty = quicky_XY(emptyBmap);
image.setImageBitmap(charty);
}
public static Bitmap quicky_XY(Bitmap bitmap) {
// xode to get bitmap onto screen
Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap
.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(output);
final int color = 0xff0B0B61;
final Paint paint = new Paint();
final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
final RectF rectF = new RectF(rect);
final float roundPx = 12;
// get the little rounded cornered outside
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(color);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
// ---- NOw just draw on this bitmap
// Set the labels info manually
String[] cur_elt_array = new String[4];
cur_elt_array[0] = "Voltage";
cur_elt_array[1] = "volts";
cur_elt_array[2] = "93"; // max
cur_elt_array[3] = "0"; // min
Vector labels = new Vector();
labels.add(cur_elt_array);
draw_the_grid(canvas, labels);
// se the data to be plotted and we should on our way
Vector data_2_plot = new Vector();
data_2_plot.add("0.2");
data_2_plot.add("1.2");
data_2_plot.add("9.6");
data_2_plot.add("83.2");
data_2_plot.add("44.2");
data_2_plot.add("20.2");
data_2_plot.add("16.2");
plot_array_list(canvas, data_2_plot, labels, "the title", 0);
canvas.drawBitmap(bitmap, rect, rect, paint);
return output;
}
public static void draw_the_grid(Canvas this_g, Vector these_labels) {
double rounded_max = 0.0;
double rounded_min = 0.0;
double rounded_max_temp;
Object curElt;
String[] cur_elt_array;
int left_margin_d, right_margin_d;
if (draw_only_this_idx == -1)
curElt = these_labels.elementAt(0); // default it to 1st one if non
// set
else
curElt = these_labels.elementAt(draw_only_this_idx); // now just the
// 1st elt
cur_elt_array = (String[]) curElt;
rounded_max = get_ceiling_or_floor(
Double.parseDouble(cur_elt_array[2]), true);
rounded_min = get_ceiling_or_floor(
Double.parseDouble(cur_elt_array[3]), false);
// ok so now we have the max value of the set just get a cool ceiling
// and we go on
final Paint paint = new Paint();
paint.setTextSize(15);
left_margin_d = getCurTextLengthInPixels(paint, Double
.toString(rounded_max));
// keep the position for later drawing -- leave space for the legend
int p_height = 170;
int p_width = 220;
int[] tmp_draw_sizes = { 2 + left_margin_d, 25,
p_width - 2 - left_margin_d, p_height - 25 - 5 };
drawSizes = tmp_draw_sizes; // keep it for later processing
// with the mzrgins worked out draw the plotting grid
paint.setStyle(Paint.Style.FILL);
paint.setColor(Color.WHITE);
// Android does by coords
this_g
.drawRect(drawSizes[0], drawSizes[1], drawSizes[0]
+ drawSizes[2], drawSizes[1] + drawSizes[3], paint);
paint.setColor(Color.GRAY);
// finally draw the grid
paint.setStyle(Paint.Style.STROKE);
this_g
.drawRect(drawSizes[0], drawSizes[1], drawSizes[0]
+ drawSizes[2], drawSizes[1] + drawSizes[3], paint);
for (int i = 1; i < 5; i++) {
this_g.drawLine(drawSizes[0],
drawSizes[1] + (i * drawSizes[3] / 5), drawSizes[0]
+ drawSizes[2], drawSizes[1]
+ (i * drawSizes[3] / 5), paint);
this_g.drawLine(drawSizes[0] + (i * drawSizes[2] / 5),
drawSizes[1], drawSizes[0] + (i * drawSizes[2] / 5),
drawSizes[1] + drawSizes[3], paint);
}
// good for one value
print_axis_values_4_grid(this_g, cur_elt_array[1], Double
.toString(rounded_max), Double.toString(rounded_min),
cur_elt_array[0], 2, 0);
} // --- end of draw_grid ---
private static Point scale_point(int this_x, double this_y,
Point drawPoint, int scr_x, int scr_y, int scr_width,
int src_height, double maxX, double minX, double maxY, double minY) {
int temp_x, temp_y;
Point temp = new Point();
if (maxY == minY) // skip bad data
return null;
// don't touch it if is nothing
try {
temp_x = scr_x
+ (int) (((double) this_x - minX) * ((double) scr_width / (maxX - minX)));
temp_y = scr_y
+ (int) ((maxY - this_y) * ((double) src_height / (maxY - minY)));
temp.x = temp_x;
temp.y = temp_y;
drawPoint = temp;
} catch (Exception e) {
return (null);
}
return temp;
} // --- end of scale_point --
public static boolean plot_array_list(Canvas this_g,
Vector this_array_list, Vector these_labels, String this_title,
int only_this_idx) {
int idx;
int lRow;
int nParms;
int i, points_2_plot, shifted_idx;
int prev_x, prev_y;
int cur_x = 0, cur_y = 0;
// Dim ShowMarker As Object
Point cur_point = new Point();
cur_point.set(0, 0);
double cur_maxX, cur_minX, cur_maxY = 20, cur_minY = 0, cur_rangeY;
int cur_start_x, cur_points_2_plot;
int POINTS_TO_CHANGE = 30;
double cur_OBD_val;
// Object curElt;
String curElt;
String[] cur_elt_array;
Object curElt2;
String[] cur_elt_array2;
final Paint paint = new Paint();
try // catch in this block for some thing
{
points_2_plot = this_array_list.size();
{
cur_start_x = 0;
cur_points_2_plot = points_2_plot;
cur_maxX = cur_points_2_plot;
cur_minX = 0;
}
// 'Create the plot points for this series from the ChartPoints
// array:
curElt = (String) this_array_list.elementAt(0);
// the lines have to come out good
paint.setStyle(Paint.Style.STROKE);
//
// for( nParms = 0 ; nParms < cur_elt_array.length ; nParms++ )
nParms = only_this_idx;
{
// get cur item labels
curElt2 = these_labels.elementAt(nParms);
cur_elt_array2 = (String[]) curElt2;
cur_maxY = get_ceiling_or_floor(Double
.parseDouble(cur_elt_array2[2]), true);
cur_minY = get_ceiling_or_floor(Double
.parseDouble(cur_elt_array2[3]), false);
cur_points_2_plot = this_array_list.size();
cur_maxX = cur_points_2_plot;
curElt = (String) this_array_list.elementAt(0);
cur_OBD_val = Double.parseDouble(curElt);
cur_point = scale_point(0, cur_OBD_val, cur_point,
drawSizes[0], drawSizes[1], drawSizes[2], drawSizes[3],
cur_maxX, cur_minX, cur_maxY, cur_minY); // '(CInt(curAxisValues.Mins(nParms
// - 2) / 5)
// + 1) * 5)
cur_x = cur_point.x;
cur_y = cur_point.y;
paint.setColor(Color.GREEN);
// the point is only cool when samples are low
if (cur_points_2_plot < POINTS_TO_CHANGE)
this_g.drawRect(cur_x - 2, cur_y - 2, cur_x - 2 + 4,
cur_y - 2 + 4, paint);
prev_x = cur_x;
prev_y = cur_y;
// 'go and plot point for this parm -- pont after the 1st one
for (lRow = cur_start_x + 1; lRow < cur_start_x
+ cur_points_2_plot - 1; lRow++) {
curElt = (String) this_array_list.elementAt(lRow);
cur_OBD_val = Double.parseDouble(curElt);
// 'work out an approx if cur Y values not avail(e.g.
// nothing)
// if (! (cur_elt_array[nParms ] == null ) ) //skip bad one
if (cur_OBD_val == Double.NaN)
continue; // skip bad one
{
cur_point = scale_point(lRow, cur_OBD_val, cur_point,
drawSizes[0], drawSizes[1], drawSizes[2],
drawSizes[3], cur_maxX, cur_minX, cur_maxY,
cur_minY);
cur_x = cur_point.x;
cur_y = cur_point.y;
if (cur_points_2_plot < POINTS_TO_CHANGE)
this_g.drawRect(cur_x - 2, cur_y - 2,
cur_x - 2 + 4, cur_y - 2 + 4, paint);
this_g.drawLine(prev_x, prev_y, cur_x, cur_y, paint);
prev_x = cur_x;
prev_y = cur_y;
} // ' if end of this_array(lRow, nParms - 1)<> nothing
} // end of for lrow
} // end of for nParmns
// this_g.invalidate();
return (true);
} catch (Exception e) {
return (false);
}
} // --- end of plot_array_list --
public static void print_axis_values_4_grid(Canvas thisDrawingArea,
String cur_units, String cur_max, String cur_min, String cur_label,
int x_guide, int this_idx) {
String this_str;
double delta = (Double.valueOf(cur_max).doubleValue() - Double.valueOf(
cur_min).doubleValue()) / 5;
final Paint paint = new Paint();
paint.setColor(Color.WHITE);
paint.setTypeface(Typeface.SANS_SERIF);
paint.setTextSize(8);
for (int i = 0; i < 6; i++) {
this_str = Double
.toString((Double.valueOf(cur_min).doubleValue() + delta
* i));
final int point = this_str.indexOf('.');
if (point > 0) {
// If has a decimal point, may need to clip off after or force 2
// decimal places
this_str = this_str + "00";
this_str = this_str.substring(0, point + 3);
} else {
this_str = this_str + ".00";
}
if (i == 5) {
thisDrawingArea.drawText(this_str, x_guide - 2, drawSizes[1]
+ drawSizes[3] - (i * drawSizes[3] / 5), paint);
} else {
thisDrawingArea.drawText(this_str, x_guide - 2, drawSizes[1]
+ drawSizes[3] - (i * drawSizes[3] / 5) - 3, paint);
}
}
paint.setTextSize(10);
switch (this_idx) {
case 0:
thisDrawingArea.drawText(" " + cur_label + " - " + cur_units,
x_guide - 2, drawSizes[1] - 15, paint);
break;
default:
thisDrawingArea.drawText(" " + cur_label + " - " + cur_units,
x_guide - 2 - 30, drawSizes[1] - 15, paint);
break;
}
}
private static int getCurTextLengthInPixels(Paint this_paint,
String this_text) {
FontMetrics fp = this_paint.getFontMetrics();
Rect rect = new Rect();
this_paint.getTextBounds(this_text, 0, this_text.length(), rect);
return rect.width();
}
public static double get_ceiling_or_floor(double this_val, boolean is_max) {
double this_min_tmp;
int this_sign;
int this_10_factor = 0;
double this_rounded;
if (this_val == 0.0) {
this_rounded = 0.0;
return this_rounded;
}
this_min_tmp = Math.abs(this_val);
if (this_min_tmp >= 1.0 && this_min_tmp < 10.0)
this_10_factor = 1;
else if (this_min_tmp >= 10.0 && this_min_tmp < 100.0)
this_10_factor = 10;
else if (this_min_tmp >= 100.0 && this_min_tmp < 1000.0)
this_10_factor = 100;
else if (this_min_tmp >= 1000.0 && this_min_tmp < 10000.0)
this_10_factor = 1000;
else if (this_min_tmp >= 10000.0 && this_min_tmp < 100000.0)
this_10_factor = 10000;
// 'cover when min is pos and neg
if (is_max) {
if (this_val > 0.0)
this_sign = 1;
else
this_sign = -1;
} else {
if (this_val > 0.0)
this_sign = -1;
else
this_sign = 1;
}
if (this_min_tmp > 1)
this_rounded = (double) (((int) (this_min_tmp / this_10_factor) + this_sign) * this_10_factor);
else {
this_rounded = (int) (this_min_tmp * 100.0);
// ' cover same as above bfir number up to .001 less than tha it
// will skip
if (this_rounded >= 1 && this_rounded < 9)
this_10_factor = 1;
else if (this_rounded >= 10 && this_rounded < 99)
this_10_factor = 10;
else if (this_rounded >= 100 && this_rounded < 999)
this_10_factor = 100;
this_rounded = (double) (((int) ((this_rounded) / this_10_factor) + this_sign) * this_10_factor);
this_rounded = (int) (this_rounded) / 100.0;
}
if (this_val < 0)
this_rounded = -this_rounded;
return this_rounded;
}
}
源码下载：http://files.cnblogs.com/salam/XYChart.rar
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