自定义编辑水印篇
自定义编辑水印涉及到控件的自定义，控件位置的移动，图片大小和文字大小缩放，文字的颜色改变，还有水印的透明度。
水印元素包括了
-
图片水印
-
文字水印
涉及到的控件
- 模拟屏幕的一个容器控件，用于放置水印元素的
- 图片水印元素控件
- 文字水印元素控件
- 文字选择颜色值控件
水印需要保存的信息：数据库信息
-
水印透明度alpha
-
水印宽度widthRatio比例（涉及到横竖屏）
-
水印高度heightRatio比例（涉及到横竖屏）
-
水印位置centerX比例（涉及到横竖屏）
-
水印位置centerY比例（涉及到横竖屏）
-
文字水印颜色color
-
文字水印文案信息
-
文字缩放大小值textSize
-
图片水印文件路径
-
水印元素ID（数据库ID自动生成）
控件手势移动
/**
* @author jaysen.lin@foxmail.com
* @since 2019/8/8
*/
public class MoveGestureDetector {
private float x = 0, y = 0;
public MoveGestureDetector() {
}
public boolean detectMoveAction(View view, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
x = event.getRawX();
y = event.getRawY();
return true;
case MotionEvent.ACTION_MOVE:
float x1 = event.getRawX();
float y1 = event.getRawY();
int dx = (int) (x1 - x);
int dy = (int) (y1 - y);
int l = view.getLeft() + dx;
int t = view.getTop() + dy;
int r = view.getRight() + dx;
int b = view.getBottom() + dy;
if (l < 0) {//超出父类控件左边际，重置为0
l = 0;
r = l + view.getWidth();
}
if (t < 0) {//超出父类控件上边际，重置为0
t = 0;
b = t + view.getHeight();
}
ViewParent parent = view.getParent();
ViewGroup p = (ViewGroup) parent;
if (r > p.getWidth()) {//超出父类控件右边际，重置
r = p.getWidth();
l = r - view.getWidth();
}
if (b > p.getHeight()) {//超出父类控件下边际，重置
b = p.getHeight();
t = b - view.getHeight();
}
float halfW = view.getMeasuredWidth() / 2.0f;
float halfH = view.getMeasuredHeight() / 2.0f;
float centerXRatio = (l + halfW) / p.getMeasuredWidth();
float centerYRatio = (t + halfH) / p.getMeasuredHeight();
//todo 把centerXRatio，centerYRatio的横竖屏信息保存起来
//还有就是刷新控件重新计算大小和布局
view.requestLayout();
x = x1;
y = y1;
return true;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
return true;
}
return false;
}
控件位置计算
/**
* @author jaysen.lin@foxmail.com
* @since 2019/8/8
*/
public class PositionCalculator {
//用于代理计算child比例大小
public Size calculateChildSize(int pWidth, int pHeight) {
}
public void updateCenterXY() {
//当缩放超出左边界或上边际时调用该方法更新centerX和centerY，需要考虑横竖屏
//调用getLeftOrTop（...）获取原先的left或者top，来更新左边界上边界再重新计算centerX和
//centerY占父容器的比例。
}
public int getLeft() {
//在child layout()方法里调用该方法获取计算得到的left，需要考虑横竖屏
}
public int getTop() {
//在child layout()方法里调用该方法获取计算得到的top，需要考虑横竖屏
}
public int getLeftOrTop(float centerRatio, int viewSize, int parentSize) {
float half = viewSize / 2.0f;
float pointSide = centerRatio * parentSize - half;
if (pointSide < 0) {
return 0;
}
return (int) pointSide;
}
}
控件大小计算
View.onMeasure()调用周期
通过View.requestLayout()来刷新计算控件大小，控件重写了View.onMeasure()计算控件的大小，重写View.layout()来布局当前控件的位置和宽高。
TextView的水印自定义控件使用到了android.text.StaticLayout.java来自动计算字体的大小宽高
控件放大缩小算法和进度条计算算法
-
图片水印控件放大缩小算法
private void iniView(){ //通过decodeImageBounds获取得到imageSize this.imageMaxSide = Math.max(imageSize.getWidth(), this.imageSize.getHeight()); if (this.imageMaxSide == 0) { this.imageMaxSide = this.screenMinSide; } float scaledFactorInitProgress = 1.0f; if (imageItemInfo.widthRatio == 0.0f) { Size size = new Size(this.imageSize.getWidth(), this.imageSize.getHeight()); if (this.imageMaxSide > this.screenMinSide / 3) { scaledFactorInitProgress = 1.0f * this.screenMinSide / 3.0f / this.imageMaxSide; size.setWidth((int) (size.getWidth() * scaledFactorInitProgress)); size.setHeight((int) (size.getHeight() * scaledFactorInitProgress)); } imageItemInfo.widthRatio = getWidthRatio(size.getWidth()); imageItemInfo.heightRatio = getHeightRatio(size.getHeight()); } else { scaledFactorInitProgress = imageItemInfo.widthRatio * this.screenWidth / this.imageSize.getWidth(); } initProgressBar(scaledFactorInitProgress); } private float getWidthRatio(int scaledWidth) { return 1.0f * scaledWidth / this.screenWidth; } // private float getHeightRatio(int scaledHeight) { return 1.0f * scaledHeight / this.screenHeight; } private void initProgressBar(float initProgressRatio) { float progress = (int) (initProgressRatio * 10_0000.0f); float scaledFactor1_8 = 1.0f;//8分之1 float scaledFactor1_1 = this.screenMinSide * 1.0f / this.imageMaxSide; if (this.imageMaxSide > this.screenMinSide / 8) {//8分之1 scaledFactor1_8 = 1.0f * this.screenMinSide / 8.0f / this.imageMaxSide; } int progress1_8 = (int) (scaledFactor1_8 * 10_0000.0f); int progress1_1 = (int) (scaledFactor1_1 * 10_0000.0f); if (progress1_1 < progress1_8) { progress1_1 = progress1_8; } this.maxProgress = progress1_1 - progress1_8; this.startProgress = progress1_8; this.mSizeSeekBar.setMax(this.maxProgress); this.mSizeSeekBar.setProgress((int) (progress - this.startProgress)); } -
文字水印控件放大缩小算法
// mSizeSeekBar.setMax(500);//最大值500 private int getProgressFromTextSize(float textSize) {//textSize in sp return (int) ((textSize - 13.0f) * 1.0f / 67.0f * 500.0f); } private int getTextSizeFromProgress(int progress) { return (int) (13.0f + (1.0f * progress / 500.0f * 67.0f)); } -
文字水印颜色的选择和进度条的转换算法
public int getColorFromProgress(int progress) { int r = 0; int g = 0; int b = 0; if (progress < 256) { b = progress; } else if (progress < 256 * 2) { g = progress % 256; b = 256 - progress % 256; } else if (progress < 256 * 3) { g = 255; b = progress % 256; } else if (progress < 256 * 4) { r = progress % 256; g = 256 - progress % 256; b = 256 - progress % 256; } else if (progress < 256 * 5) { r = 255; g = 0; b = progress % 256; } else if (progress < 256 * 6) { r = 255; g = progress % 256; b = 256 - progress % 256; } else if (progress < 256 * 7) { r = 255; g = 255; b = progress % 256; } return Color.argb(255, r, g, b); } /** * @param color the color must be generated from {@link ColorPickerSeekBar#getColorFromProgress(int)} */ public void setProgressFromColor(int color) { int r = (color >> 16) & 0xff; int g = (color >> 8) & 0xff; int b = (color) & 0xff; int value = (255 << 24) | (r << 16) | (g << 8) | b; int progress[] = { b , 256 + g , 256 * 2 + b , 256 * 3 + r , 256 * 4 + b , 256 * 5 + g , 256 * 6 + b }; for (int theProgress : progress) { int colorFromProgress = getColorFromProgress(theProgress); MyLog.e("colorFromProgress:" + colorFromProgress + " value:" + value+" theProgress:"+theProgress); if (colorFromProgress == value) { setProgress(theProgress); MyLog.e("hit theProgress:" +theProgress); return; } }setProgress(MAX);//default white color MyLog.e("setProgress default:" +MAX); }
OpenGL 画图篇
OpenGL API V2
定义定点脚本和片段着色脚本
protected String vertexShaderCode =
"uniform mat4 uMVPMatrix;" +
"attribute vec4 a_position; " +
"attribute vec2 a_texCoord; " +
"varying vec2 v_texCoord; " +
"void main() " +
"{ " +
"gl_Position = uMVPMatrix * a_position; " +
"v_texCoord = a_texCoord; " +
"} ";
protected String fragmentShaderCode =
"precision lowp float; " +
"varying vec2 v_texCoord; " +
"uniform sampler2D u_samplerTexture; " +
"uniform float opacity;" +
"void main() " +
"{ " +
"vec4 color = texture2D(u_samplerTexture, v_texCoord).rgba;" +
"gl_FragColor = vec4(color.xyz, color.a * opacity); " +
"} ";
创建OpenGL脚本画图程序编译，然后链接程序
public static int loadShader(int shaderType, String source) {
int shader = GLES20.glCreateShader(shaderType);
GLES20.glShaderSource(shader, source);
GLES20.glCompileShader(shader);
int[] compiled = new int[1];
GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
if (compiled[0] == 0) {
MyLog.e("Could not compile shader(TYPE=" + shaderType + "):");
MyLog.e(GLES20.glGetShaderInfoLog(shader));
GLES20.glDeleteShader(shader);
shader = 0;
}
return shader;
}
public static int createProgram(String vertexShaderCode, String fragmentShaderCode) {
int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode);
int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);
// create empty OpenGL ES Program
int program = GLES20.glCreateProgram();
// add the vertex shader to program
GLES20.glAttachShader(program, vertexShader);
// add the fragment shader to program
GLES20.glAttachShader(program, fragmentShader);
// creates OpenGL ES program executables
GLES20.glLinkProgram(program);
return program;
}
创建水印纹理
public static int createTexture() {
int[] textureIds = new int[1];
GLES20.glGenTextures(1, textureIds, 0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureIds[0]);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
return textureIds[0];
}
计算水印坐标转换成openGL的坐标矩阵
protected CoordinateUtils.CoordinatesF coordinatesF = new CoordinateUtils.CoordinatesF(
-1.0f, 1.0f,
-1.0f, 1.0f);
/**
* @param ratio
* @return 自定义水印矩阵
*/
private float[] calculateCustomWatermarkMatrix(float ratio) {
this.coordinatesF.leftRatio = -ratio;
this.coordinatesF.rightRatio = ratio;
float[] scratch = new float[16];//最终的矩阵
Matrix.frustumM(mProjectionMatrix, 0, -ratio, ratio, -1, 1, 3, 7);//视锥体 视景体的6个裁剪平面（左、右、底、顶、近和远）
Matrix.setLookAtM(mViewMatrix, 0, 0, 0, 3, 0f, 0f, 0f, 0f, 1f, 0.0f);//eyeX eyeY eyeZ 0f, 0f, -3, centerX centerY centerZ 0 0 0 upX upY upZ 0 1 0
MyLog.e(Arrays.toString(mProjectionMatrix));//4 * 4 的矩阵
MyLog.e(Arrays.toString(mViewMatrix));//4 * 4 的矩阵
Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mViewMatrix, 0);
Matrix.setRotateM(mRotationMatrix, 0, mAngle, 0, 0, -1.0f);
Matrix.multiplyMM(scratch, 0, mMVPMatrix, 0, mRotationMatrix, 0);
return scratch;
}
引用创建的OpenGL水印渲染脚本程序开始画图
// Use to access and set the view transformation 顶点着色器中的mMVPMatrix
private int mMVPMatrixHandle;
private int mPositionHandle;
private int mTexCoordHandle;
private int mTexSamplerHandle;
private int mOpacityHandle;
/**
*
* @param ratio ratio = w * 1.0f / (h * 1.0f);
* @param isPortrait
*/
public void draw(float ratio, boolean isPortrait) {
this.isPortrait = isPortrait;
GLES20.glUseProgram(mProgram);
mPositionHandle = GLES20.glGetAttribLocation(mProgram, "a_position");
mTexCoordHandle = GLES20.glGetAttribLocation(mProgram, "a_texCoord");
mMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
mTexSamplerHandle = GLES20.glGetUniformLocation(mProgram, "u_samplerTexture");
mOpacityHandle = GLES20.glGetUniformLocation(mProgram, "opacity");
float[] mvpMatrix = calculateCustomWatermarkMatrix(ratio);
bindTexture2D(mvpMatrix, getBitmap(), getItemInfo().alpha);
}
private void bindTexture2D(float[] matrix, Bitmap bitmap, float mask_opacity) {
FloatBuffer positionBuffer = getPositionBuffer(getItemInfo());//获取转换的坐标矩阵缓冲变量
final int vertexCount = positionFloatArrCoordinate.length / COORDS_PER_VERTEX;
final int vertexStride = COORDS_PER_VERTEX * 4; // 4 bytes per vertex
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
GLES20.glUniform1f(mOpacityHandle, mask_opacity);
GLES20.glEnableVertexAttribArray(mPositionHandle);
GLES20.glEnableVertexAttribArray(mTexCoordHandle);
GLES20.glUniform1i(mTexSamplerHandle, 0);
GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, matrix, 0);
positionBuffer.position(0);
GLES20.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX, GLES20.GL_FLOAT, false, vertexStride, positionBuffer);
positionBuffer.position(3);
this.textureBuffer.position(0);
GLES20.glVertexAttribPointer(mTexCoordHandle, 2, GLES20.GL_FLOAT, false, 8, this.textureBuffer);
this.drawOderBuffer.position(0);
GLES20.glEnable(GLES20.GL_BLEND);
GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ONE_MINUS_SRC_ALPHA);
GLES20.glDrawElements(GLES20.GL_TRIANGLES, drawOrder.length, GLES20.GL_UNSIGNED_SHORT, this.drawOderBuffer);
GLES20.glDisable(GLES20.GL_BLEND);
GLES20.glDisableVertexAttribArray(mPositionHandle);
GLES20.glDisableVertexAttribArray(mTexCoordHandle);
}
/**
*
* @param itemEntity
* @return FloatBuffer
*/
protected FloatBuffer getPositionBuffer(BaseWatermarkItemEntity itemEntity) {
// 2019/8/16 width and centerX
float widthRatio, heightRatio;
if (isPortrait) {
widthRatio = itemEntity.widthRatio;
heightRatio = itemEntity.heightRatio;
} else {
int widthPixels = mContext.getResources().getDisplayMetrics().widthPixels;
int heightPixels = mContext.getResources().getDisplayMetrics().heightPixels;
int min = Math.min(widthPixels, heightPixels);
int max = Math.max(widthPixels, heightPixels);
float originWidth = itemEntity.widthRatio * min;
float originHeight = itemEntity.heightRatio * max;
widthRatio = originWidth / max;
heightRatio = originHeight / min;
}
return transformCoordinate(
new PointF(widthRatio, heightRatio)
, new PointF(isPortrait ? itemEntity.vCenterX : itemEntity.hCenterX
, isPortrait ? itemEntity.vCenterY : itemEntity.hCenterY)
, coordinatesF);
}
/**
* this.positionFloatArrCoordinate
*
* @param widthHeightRatio
* @param centerXY
* @param coordinatesF
* @return
*/
protected FloatBuffer transformCoordinate(PointF widthHeightRatio, PointF centerXY, CoordinateUtils.CoordinatesF coordinatesF) {
RectF rectF = getRectF(widthHeightRatio, centerXY, coordinatesF);//获取宽高在OpenGL坐标系中的坐标占比
float left = rectF.left;
float top = rectF.top;
float right = rectF.right;
float bottom = rectF.bottom;
this.positionFloatArrCoordinate = new float[]{
left, top, 0.0f,
left, bottom, 0.0f,
right, bottom, 0.0f,
right, top, 0.0f};
return createFloatBuffer(this.positionFloatArrCoordinate);
}
/**
**创建缓冲变量
*/
public static FloatBuffer createFloatBuffer(float[] fArr) {
ByteBuffer allocateDirect = ByteBuffer.allocateDirect(fArr.length * 4);
allocateDirect.order(ByteOrder.nativeOrder());
FloatBuffer asFloatBuffer = allocateDirect.asFloatBuffer();
asFloatBuffer.put(fArr);
asFloatBuffer.position(0);
return asFloatBuffer;
}
Open GL Android 知识
OpenGL ES
此链接的文档详细介绍了Android 如何使用OpenGL版本和如何转换坐标映射到屏幕，还有投影和相机视图矩阵变换来使得在手机屏幕上不会失真变形。
Figure 1. Default OpenGL coordinate system (left) mapped to a typical Android device screen (right).
Displaying graphics with OpenGL ES
-
Build an OpenGL ES environment
Learn how to set up an Android application to be able to draw OpenGL graphics.
-
Define shapes
Learn how to define shapes and why you need to know about faces and winding.
-
Draw shapes
Learn how to draw OpenGL shapes in your application.
-
Apply projection and camera views
Learn how to use projection and camera views to get a new perspective on your drawn objects.
-
Add motion
Learn how to do basic movement and animation of drawn objects with OpenGL.
-
Respond to touch events
Learn how to do basic interaction with OpenGL graphics.
Additional sample code
To download NDK samples, see NDK Samples.