linglongxin24/AndroidNote
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Fix code view

Browse Source
This commit is contained in:
sloop
2016-08-12 22:09:54 +08:00
parent acce0bc6f8
commit e2ceb6da22
1 changed files with 71 additions and 72 deletions
Download Patch File Download Diff File Expand all files Collapse all files

143
CustomView/Advance/[10]Matrix_Method.md
View File

@@ -146,22 +146,21 @@ void mapPoints (float[] dst, int dstIndex,float[] src, int srcIndex, int pointCo
示例:
``` java
// 初始数据为三个点 (0, 0) (80, 100) (400, 300)
float[] pts = new float[]{0, 0, 80, 100, 400, 300};
// 初始数据为三个点 (0, 0) (80, 100) (400, 300)
float[] pts = new float[]{0, 0, 80, 100, 400, 300};
// 构造一个matrix，x坐标缩放0.5
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
// 输出pts计算之前数据
Log.i(TAG, "before: "+ Arrays.toString(pts));
// 调用map方法计算
matrix.mapPoints(pts);
// 输出pts计算之后数据
Log.i(TAG, "after : "+ Arrays.toString(pts));
// 构造一个matrix，x坐标缩放0.5
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
// 输出pts计算之前数据
Log.i(TAG, "before: "+ Arrays.toString(pts));
// 调用map方法计算
matrix.mapPoints(pts);
// 输出pts计算之后数据
Log.i(TAG, "after : "+ Arrays.toString(pts));
```
结果:
@@ -178,24 +177,24 @@ after : [0.0, 0.0, 40.0, 100.0, 200.0, 300.0]
示例:
``` java
// 初始数据为三个点 (0, 0) (80, 100) (400, 300)
float[] src = new float[]{0, 0, 80, 100, 400, 300};
float[] dst = new float[6];
// 初始数据为三个点 (0, 0) (80, 100) (400, 300)
float[] src = new float[]{0, 0, 80, 100, 400, 300};
float[] dst = new float[6];
// 构造一个matrix，x坐标缩放0.5
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
// 构造一个matrix，x坐标缩放0.5
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
// 输出计算之前数据
Log.i(TAG, "before: src="+ Arrays.toString(src));
Log.i(TAG, "before: dst="+ Arrays.toString(dst));
// 输出计算之前数据
Log.i(TAG, "before: src="+ Arrays.toString(src));
Log.i(TAG, "before: dst="+ Arrays.toString(dst));
// 调用map方法计算
matrix.mapPoints(dst,src);
// 调用map方法计算
matrix.mapPoints(dst,src);
// 输出计算之后数据
Log.i(TAG, "after : src="+ Arrays.toString(src));
Log.i(TAG, "after : dst="+ Arrays.toString(dst));
// 输出计算之后数据
Log.i(TAG, "after : src="+ Arrays.toString(src));
Log.i(TAG, "after : dst="+ Arrays.toString(dst));
```
结果:
@@ -224,24 +223,24 @@ pointCount | 计算的点个数
将第二、三个点计算后存储进dst最开始位置。
``` java
// 初始数据为三个点 (0, 0) (80, 100) (400, 300)
float[] src = new float[]{0, 0, 80, 100, 400, 300};
float[] dst = new float[6];
// 构造一个matrix，x坐标缩放0.5
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
// 输出计算之前数据
Log.i(TAG, "before: src="+ Arrays.toString(src));
Log.i(TAG, "before: dst="+ Arrays.toString(dst));
// 调用map方法计算(最后一个2表示两个点，即四个数值,并非两个数值)
matrix.mapPoints(dst, 0, src, 2, 2);
// 输出计算之后数据
Log.i(TAG, "after : src="+ Arrays.toString(src));
Log.i(TAG, "after : dst="+ Arrays.toString(dst));
// 初始数据为三个点 (0, 0) (80, 100) (400, 300)
float[] src = new float[]{0, 0, 80, 100, 400, 300};
float[] dst = new float[6];
// 构造一个matrix，x坐标缩放0.5
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
// 输出计算之前数据
Log.i(TAG, "before: src="+ Arrays.toString(src));
Log.i(TAG, "before: dst="+ Arrays.toString(dst));
// 调用map方法计算(最后一个2表示两个点，即四个数值,并非两个数值)
matrix.mapPoints(dst, 0, src, 2, 2);
// 输出计算之后数据
Log.i(TAG, "after : src="+ Arrays.toString(src));
Log.i(TAG, "after : dst="+ Arrays.toString(dst));
```
结果:
@@ -264,18 +263,18 @@ float mapRadius (float radius)
示例:
``` java
float radius = 100;
float result = 0;
// 构造一个matrix，x坐标缩放0.5
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
Log.i(TAG, "mapRadius: "+radius);
result = matrix.mapRadius(radius);
Log.i(TAG, "mapRadius: "+result);
float radius = 100;
float result = 0;
// 构造一个matrix，x坐标缩放0.5
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
Log.i(TAG, "mapRadius: "+radius);
result = matrix.mapRadius(radius);
Log.i(TAG, "mapRadius: "+result);
```
结果:
@@ -301,19 +300,19 @@ boolean mapRect (RectF dst, RectF src)
示例：
``` java
RectF rect = new RectF(400, 400, 1000, 800);
// 构造一个matrix
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
matrix.postSkew(1,0);
Log.i(TAG, "mapRadius: "+rect.toString());
boolean result = matrix.mapRect(rect);
Log.i(TAG, "mapRadius: "+rect.toString());
Log.e(TAG, "isRect: "+ result);
RectF rect = new RectF(400, 400, 1000, 800);
// 构造一个matrix
Matrix matrix = new Matrix();
matrix.setScale(0.5f, 1f);
matrix.postSkew(1,0);
Log.i(TAG, "mapRadius: "+rect.toString());
boolean result = matrix.mapRect(rect);
Log.i(TAG, "mapRadius: "+rect.toString());
Log.e(TAG, "isRect: "+ result);
```
结果：