package com.example.android.apis.graphics;
23.TextAlign：
设置Path路径，贝赛尔曲线
//设置Path路径
private static void makePath(Path p) {
p.moveTo(10, 0);
p.cubicTo(100, -50, 200, 50, 300, 0);//贝赛尔曲线
}
//mPos存的是字符串中每个字符的位置坐标
private float[] buildTextPositions(String text, float y, Paint paint) {
float[] widths = new float[text.length()];
// initially get the widths for each char
int n = paint.getTextWidths(text, widths);
// now popuplate the array, interleaving spaces for the Y values X值为字符的宽
float[] pos = new float[n * 2];
float accumulatedX = 0;
for (int i = 0; i < n; i++) {
pos[i * 2 + 0] = accumulatedX;
pos[i * 2 + 1] = y;
accumulatedX += widths[i];
}
return pos;
}
onDraw（）方法中：
画
p.setColor(0x80FF0000);
canvas.drawLine(x, y, x, y + DY * 3, p);//(x,y)为基准线
p.setColor(Color.BLACK);
canvas.translate(0, DY);
p.setTextAlign(Paint.Align.LEFT);
canvas.drawText(TEXT_L, x, y, p);//以（x,y）点Paint.Align.LEFT，
画
画
p.setColor(0xBB00FF00);
for (int i = 0; i < pos.length / 2; i++) {
canvas.drawLine(pos[i * 2 + 0], pos[i * 2 + 1] - DY, pos[i * 2 + 0],
pos[i * 2 + 1] + DY * 2, p);
}
p.setColor(Color.BLACK);
p.setTextAlign(Paint.Align.LEFT);
canvas.drawPosText(POSTEXT, pos, p);
画
canvas.drawPath(mPath, mPathPaint);
p.setTextAlign(Paint.Align.LEFT);
canvas.drawTextOnPath(TEXTONPATH, mPath, 0, 0, p);
canvas.translate(0, DY * 1.5f);
canvas.drawPath(mPath, mPathPaint);
p.setTextAlign(Paint.Align.CENTER);
canvas.drawTextOnPath(TEXTONPATH, mPath, 0, 0, p);
canvas.translate(0, DY * 1.5f);
canvas.drawPath(mPath, mPathPaint);
p.setTextAlign(Paint.Align.RIGHT);
canvas.drawTextOnPath(TEXTONPATH, mPath, 0, 0, p);
24.Typefaces：
获得assets/fonts下的字体
mFace = Typeface.createFromAsset(getContext().getAssets(),
"fonts/samplefont.ttf");
onDraw()方法
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
mPaint.setTypeface(null);
canvas.drawText("Default", 10, 100, mPaint);
mPaint.setTypeface(mFace);
canvas.drawText("Custom", 10, 200, mPaint);
}
25.UnicodeChart：（没看）
26.Vertices:(没看) 触摸一下，图片走形
27.Xfermodes：
圆形画法：
static Bitmap makeDst(int w, int h) {
Bitmap bm = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bm);
Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
p.setColor(0xFFFFCC44);
c.drawOval(new RectF(0, 0, w * 3 / 4, h * 3 / 4), p);
return bm;
}
正方形的画法：
static Bitmap makeSrc(int w, int h) {
Bitmap bm = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bm);
Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);
p.setColor(0xFF66AAFF);
c.drawRect(w / 3, h / 3, w * 19 / 20, h * 19 / 20, p);
return bm;
}
背景马塞克画法：
Bitmap bm = Bitmap.createBitmap(new int[] { 0xFFFFFFFF, 0xFFCCCCCC,
0xFFCCCCCC, 0xFFFFFFFF }, 2, 2, Bitmap.Config.RGB_565);
mBG = new BitmapShader(bm, Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
Matrix m = new Matrix();
m.setScale(6, 6);// 放大6倍
mBG.setLocalMatrix(m);
Xfermode数组：
private static final Xfermode[] sModes = {
new PorterDuffXfermode(PorterDuff.Mode.CLEAR),
new PorterDuffXfermode(PorterDuff.Mode.SRC),
new PorterDuffXfermode(PorterDuff.Mode.DST),
new PorterDuffXfermode(PorterDuff.Mode.SRC_OVER),
new PorterDuffXfermode(PorterDuff.Mode.DST_OVER),
new PorterDuffXfermode(PorterDuff.Mode.SRC_IN),
new PorterDuffXfermode(PorterDuff.Mode.DST_IN),
new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT),
new PorterDuffXfermode(PorterDuff.Mode.DST_OUT),
new PorterDuffXfermode(PorterDuff.Mode.SRC_ATOP),
new PorterDuffXfermode(PorterDuff.Mode.DST_ATOP),
new PorterDuffXfermode(PorterDuff.Mode.XOR),
new PorterDuffXfermode(PorterDuff.Mode.DARKEN),
new PorterDuffXfermode(PorterDuff.Mode.LIGHTEN),
new PorterDuffXfermode(PorterDuff.Mode.MULTIPLY),
new PorterDuffXfermode(PorterDuff.Mode.SCREEN) };
onDraw()方法：
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(Color.WHITE);
Paint labelP = new Paint(Paint.ANTI_ALIAS_FLAG);
labelP.setTextAlign(Paint.Align.CENTER);
Paint paint = new Paint();
paint.setFilterBitmap(false);
canvas.translate(15, 35);
int x = 0;
int y = 0;
for (int i = 0; i < sModes.length; i++) {
// draw the border
paint.setStyle(Paint.Style.STROKE);
paint.setShader(null);// Pass null to clear any previous shader
canvas.drawRect(x - 0.5f, y - 0.5f, x + W + 0.5f, y + H + 0.5f, paint);
// draw the checker-board pattern
paint.setStyle(Paint.Style.FILL);
paint.setShader(mBG);
canvas.drawRect(x, y, x + W, y + H, paint);
// draw the src/dst example into our offscreen bitmap
int sc = canvas.saveLayer(x, y, x + W, y + H, null,
Canvas.MATRIX_SAVE_FLAG | Canvas.CLIP_SAVE_FLAG
| Canvas.HAS_ALPHA_LAYER_SAVE_FLAG
| Canvas.FULL_COLOR_LAYER_SAVE_FLAG
| Canvas.CLIP_TO_LAYER_SAVE_FLAG);
// canvas.save();
canvas.translate(x, y);
canvas.drawBitmap(mDstB, 0, 0, paint);
paint.setXfermode(sModes[i]);
canvas.drawBitmap(mSrcB, 0, 0, paint);
padding-bottom: 0px !important; line-height: 18px; background-color: #f7f7ff !important; margin: 0em; padding-left: 12px !important; padding-right: 0px !important; color
时间： 2024-10-11 10:57:29