1.Canvas类

public class Canvas {

    public static final int ALL_SAVE_FLAG = 31;

    /** @deprecated */

    @Deprecated

    public static final int CLIP_SAVE_FLAG = 2;

    /** @deprecated */

    @Deprecated

    public static final int CLIP_TO_LAYER_SAVE_FLAG = 16;

    /** @deprecated */

    @Deprecated

    public static final int FULL_COLOR_LAYER_SAVE_FLAG = 8;

    /** @deprecated */

    @Deprecated

    public static final int HAS_ALPHA_LAYER_SAVE_FLAG = 4;

    /** @deprecated */

    @Deprecated

    public static final int MATRIX_SAVE_FLAG = 1;

    public Canvas()

    public Canvas(Bitmap bitmap) ;

    public boolean isHardwareAccelerated() ;

    public void setBitmap(Bitmap bitmap) ;

    public boolean isOpaque() ;

    public int getWidth() ;

    public int getHeight();

    public int getDensity();

    public void setDensity(int density) ;

    public int getMaximumBitmapWidth() ;

    public int getMaximumBitmapHeight() ;

    public int save() ;

    /** @deprecated */

    @Deprecated

    public int save(int saveFlags) ;

    /** @deprecated */

    @Deprecated

    public int saveLayer(RectF bounds, Paint paint, int saveFlags) ;

    public int saveLayer(RectF bounds, Paint paint) ;

    /** @deprecated */

    @Deprecated

    public int saveLayer(float left, float top, float right, float bottom, Paint paint, int saveFlags);

    public int saveLayer(float left, float top, float right, float bottom, Paint paint) ;

    /** @deprecated */

    @Deprecated

    public int saveLayerAlpha(RectF bounds, int alpha, int saveFlags) ;

    public int saveLayerAlpha(RectF bounds, int alpha) ;

    /** @deprecated */

    @Deprecated

    public int saveLayerAlpha(float left, float top, float right, float bottom, int alpha, int saveFlags);

    public int saveLayerAlpha(float left, float top, float right, float bottom, int alpha);

    public void restore() ;

    public int getSaveCount() ;

    public void restoreToCount(int saveCount);

    public void translate(float dx, float dy);

    public void scale(float sx, float sy);

    public final void scale(float sx, float sy, float px, float py);

    public void rotate(float degrees) ;

    public final void rotate(float degrees, float px, float py);

    public void skew(float sx, float sy) ;

    public void concat(Matrix matrix) ;

    public void setMatrix(Matrix matrix) ;

    /** @deprecated */

    @Deprecated

    public void getMatrix(Matrix ctm) ;

    /** @deprecated */

    @Deprecated

    public final Matrix getMatrix() ;

    /** @deprecated */

    @Deprecated

    public boolean clipRect(RectF rect, Op op);

    /** @deprecated */

    @Deprecated

    public boolean clipRect(Rect rect, Op op) ;

    public boolean clipRect(RectF rect) ;

    public boolean clipOutRect(RectF rect);

    public boolean clipRect(Rect rect);

    public boolean clipOutRect(Rect rect) ;

    /** @deprecated */

    @Deprecated

    public boolean clipRect(float left, float top, float right, float bottom, Op op) ;

    public boolean clipRect(float left, float top, float right, float bottom);

    public boolean clipOutRect(float left, float top, float right, float bottom);

    public boolean clipRect(int left, int top, int right, int bottom);

    public boolean clipOutRect(int left, int top, int right, int bottom);

    /** @deprecated */

    @Deprecated

    public boolean clipPath(Path path, Op op);

    public boolean clipPath(Path path);

    public boolean clipOutPath(Path path) ;

    public DrawFilter getDrawFilter();

    public void setDrawFilter(DrawFilter filter) ;

    public boolean quickReject(RectF rect, Canvas.EdgeType type);

    public boolean quickReject(Path path, Canvas.EdgeType type) ;

    public boolean quickReject(float left, float top, float right, float bottom, Canvas.EdgeType type);

    public boolean getClipBounds(Rect bounds) ;

    public final Rect getClipBounds() ;

    public void drawPicture(Picture picture) ;

    public void drawPicture(Picture picture, RectF dst);

    public void drawPicture(Picture picture, Rect dst) ;

    /***

    oval :      圆弧的外轮廓矩形区域。

    startAngle: 圆弧起始角度，单位为度。

    sweepAngle: 圆弧扫过的角度，顺时针方向，单位为度

    useCenter: 如果为True时，在绘制圆弧时将圆心包括在内，通常用来绘制扇形。如果为false会绘制切弦 看图吧

    paint: 绘制圆弧的画板属性，如颜色，是否填充等。**/

    public void drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint paint);

    public void drawArc(float left, float top, float right, float bottom, float startAngle, float sweepAngle, boolean useCenter, Paint paint) ;

    /**  **/

    public void drawARGB(int a, int r, int g, int b) ;

    public void drawBitmap(Bitmap bitmap, float left, float top, Paint paint) ;

    public void drawBitmap(Bitmap bitmap, Rect src, RectF dst, Paint paint);

    public void drawBitmap(Bitmap bitmap, Rect src, Rect dst, Paint paint);

    @Deprecated

    public void drawBitmap(int[] colors, int offset, int stride, float x, float y, int width, int height, boolean hasAlpha, Paint paint) ;

    @Deprecated

    public void drawBitmap(int[] colors, int offset, int stride, int x, int y, int width, int height, boolean hasAlpha, Paint paint);

    public void drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint);

    public void drawBitmapMesh(Bitmap bitmap, int meshWidth, int meshHeight, float[] verts, int vertOffset, int[] colors, int colorOffset, Paint paint);

    /*** 绘制圆形，圆心坐标cx,cy,半径 radius，paint */

    public void drawCircle(float cx, float cy, float radius, Paint paint) ;

    /*** 绘制椭圆 */

    public void drawOval(RectF oval, Paint paint);

    public void drawOval(float left, float top, float right, float bottom, Paint paint);

    public void drawColor(int color) ;

    public void drawColor(int color, Mode mode) ;

    /*****  绘制线段:pos 的数量需要是4个倍数 ******/

    public void drawLine(float startX, float startY, float stopX, float stopY, Paint paint) ;

    public void drawLines(float[] pts, int offset, int count, Paint paint) ;

    public void drawLines(float[] pts, Paint paint) ;

    public void drawPaint(Paint paint);

    public void drawPath(Path path, Paint paint);

    public void drawPoint(float x, float y, Paint paint);

    public void drawPoints(float[] pts, int offset, int count, Paint paint) ;

    public void drawPoints(float[] pts, Paint paint) ;

    @Deprecated

    public void drawPosText(char[] text, int index, int count, float[] pos, Paint paint);

    @Deprecated

    public void drawPosText(String text, float[] pos, Paint paint);

    /*** 绘制矩形 */

    public void drawRect(RectF rect, Paint paint) ;

    public void drawRect(Rect r, Paint paint);

    public void drawRect(float left, float top, float right, float bottom, Paint paint);

    public void drawRGB(int r, int g, int b);

    /******** 绘制圆角矩形，REctF,x轴上的圆角半径，y轴上圆角半径，panint *******/

    public void drawRoundRect(RectF rect, float rx, float ry, Paint paint);

    public void drawRoundRect(float left, float top, float right, float bottom, float rx, float ry, Paint paint);

    /*** 绘制text文字，从text的start到end，绘制中心点在(x,y)，*/

    public void drawText(String text, int start, int end, float x, float y, Paint paint) ;

    public void drawText(CharSequence text, int start, int end, float x, float y, Paint paint);

    public void drawText(char[] text, int index, int count, float x, float y, Paint paint);

    public void drawText(String text, float x, float y, Paint paint);

    /*** 绘制text文字，str ,path,(path是绘制的text的路径，如：path.addArc,文字会随着arc弧形绘制 )**/

    public void drawTextOnPath(String text, Path path, float hOffset, float vOffset, Paint paint) ;

    public void drawTextOnPath(char[] text, int index, int count, Path path, float hOffset, float vOffset, Paint paint) ;

    public void drawTextRun(char[] text, int index, int count, int contextIndex, int contextCount, float x, float y, boolean isRtl, Paint paint);

    public void drawTextRun(CharSequence text, int start, int end, int contextStart, int contextEnd, float x, float y, boolean isRtl, Paint paint);

    public void drawVertices(Canvas.VertexMode mode, int vertexCount, float[] verts, int vertOffset, float[] texs, int texOffset, int[] colors, int colorOffset, short[] indices, int indexOffset, int indexCount, Paint paint) ;

    public static enum VertexMode {

        TRIANGLES,

        TRIANGLE_FAN,

        TRIANGLE_STRIP;

        private VertexMode() {

        }

    }

    public static enum EdgeType {

        AA,

        BW;

        private EdgeType() {

        }

    }

}

2.Paint类

public class Paint {

    public static final int ANTI_ALIAS_FLAG = 1;

    public static final int DEV_KERN_TEXT_FLAG = 256;

    public static final int DITHER_FLAG = 4;

    public static final int EMBEDDED_BITMAP_TEXT_FLAG = 1024;

    public static final int FAKE_BOLD_TEXT_FLAG = 32;

    public static final int FILTER_BITMAP_FLAG = 2;

    public static final int HINTING_OFF = 0;

    public static final int HINTING_ON = 1;

    public static final int LINEAR_TEXT_FLAG = 64;

    public static final int STRIKE_THRU_TEXT_FLAG = 16;

    public static final int SUBPIXEL_TEXT_FLAG = 128;

    public static final int UNDERLINE_TEXT_FLAG = 8;

    public Paint();

    public Paint(int flags);

    public Paint(Paint paint);

    public void reset();

    public void set(Paint src);

    public int getFlags() ;

    public void setFlags(int flags) ;

    public int getHinting();

    public void setHinting(int mode);

    public final boolean isAntiAlias();

    public void setAntiAlias(boolean aa);

    public final boolean isDither() ;

    public void setDither(boolean dither);

    public final boolean isLinearText() ;

    public void setLinearText(boolean linearText);

    public final boolean isSubpixelText();

    public void setSubpixelText(boolean subpixelText);

    public final boolean isUnderlineText();

    public void setUnderlineText(boolean underlineText);

    public final boolean isStrikeThruText();

    public void setStrikeThruText(boolean strikeThruText);

    public final boolean isFakeBoldText();

    public void setFakeBoldText(boolean fakeBoldText);

    public final boolean isFilterBitmap() ;

    public void setFilterBitmap(boolean filter);

    public Paint.Style getStyle() ;

    public void setStyle(Paint.Style style);

    public int getColor();

    public void setColor(int color) ;

    public int getAlpha() ;

    public void setAlpha(int a);

    public void setARGB(int a, int r, int g, int b) ;

    public float getStrokeWidth();

    public void setStrokeWidth(float width);

    public float getStrokeMiter() ;

    public void setStrokeMiter(float miter);

    public Paint.Cap getStrokeCap();

    public void setStrokeCap(Paint.Cap cap);

    public Paint.Join getStrokeJoin() ;

    public void setStrokeJoin(Paint.Join join);

    public boolean getFillPath(Path src, Path dst) ;

    public Shader getShader() ;

    public Shader setShader(Shader shader) ;

    public ColorFilter getColorFilter() ;

    public ColorFilter setColorFilter(ColorFilter filter);

    public Xfermode getXfermode() ;

    public Xfermode setXfermode(Xfermode xfermode);

    public PathEffect getPathEffect() ;

    public PathEffect setPathEffect(PathEffect effect);

    public MaskFilter getMaskFilter();

    public MaskFilter setMaskFilter(MaskFilter maskfilter);

    public Typeface getTypeface() ;

    public Typeface setTypeface(Typeface typeface) ;

    public void setShadowLayer(float radius, float dx, float dy, int shadowColor);

    public void clearShadowLayer();

    public Paint.Align getTextAlign();

    public void setTextAlign(Paint.Align align);

    public Locale getTextLocale() ;

    public LocaleList getTextLocales() ;

    public void setTextLocale(Locale locale);

    public void setTextLocales(LocaleList locales);

    public boolean isElegantTextHeight() ;

    public void setElegantTextHeight(boolean elegant) ;

    public float getTextSize();

    public void setTextSize(float textSize);

    public float getTextScaleX();

    public void setTextScaleX(float scaleX);

    public float getTextSkewX() ;

    public void setTextSkewX(float skewX) ;

    public float getLetterSpacing();

    public void setLetterSpacing(float letterSpacing) ;

    public String getFontFeatureSettings();

    public void setFontFeatureSettings(String settings);

    public String getFontVariationSettings() ;

    public boolean setFontVariationSettings(String fontVariationSettings) ;

    public float ascent() ;

    public float descent();

    public float getFontMetrics(Paint.FontMetrics metrics);

    public Paint.FontMetrics getFontMetrics();

    public int getFontMetricsInt(Paint.FontMetricsInt fmi);

    public Paint.FontMetricsInt getFontMetricsInt();

    public float getFontSpacing();

    public float measureText(char[] text, int index, int count);

    public float measureText(String text, int start, int end);

    public float measureText(String text) ;

    public float measureText(CharSequence text, int start, int end);

    public int breakText(char[] text, int index, int count, float maxWidth, float[] measuredWidth);

    public int breakText(CharSequence text, int start, int end, boolean measureForwards, float maxWidth, float[] measuredWidth);

    public int breakText(String text, boolean measureForwards, float maxWidth, float[] measuredWidth) ;

    public int getTextWidths(char[] text, int index, int count, float[] widths);

    public int getTextWidths(CharSequence text, int start, int end, float[] widths);

    public int getTextWidths(String text, int start, int end, float[] widths);

    public int getTextWidths(String text, float[] widths);

    public void getTextPath(char[] text, int index, int count, float x, float y, Path path);

    public void getTextPath(String text, int start, int end, float x, float y, Path path) ;

    public void getTextBounds(String text, int start, int end, Rect bounds) ;

    public void getTextBounds(char[] text, int index, int count, Rect bounds);

    public boolean hasGlyph(String string);

    public float getRunAdvance(char[] text, int start, int end, int contextStart, int contextEnd, boolean isRtl, int offset);

    public float getRunAdvance(CharSequence text, int start, int end, int contextStart, int contextEnd, boolean isRtl, int offset);

    public int getOffsetForAdvance(char[] text, int start, int end, int contextStart, int contextEnd, boolean isRtl, float advance);

    public int getOffsetForAdvance(CharSequence text, int start, int end, int contextStart, int contextEnd, boolean isRtl, float advance) ;

    public static class FontMetricsInt {

        public int ascent;

        public int bottom;

        public int descent;

        public int leading;

        public int top;

        public FontMetricsInt() {

            throw new RuntimeException("Stub!");

        }

        public String toString() {

            throw new RuntimeException("Stub!");

        }

    }

    public static class FontMetrics {

        public float ascent;

        public float bottom;

        public float descent;

        public float leading;

        public float top;

        public FontMetrics() {

            throw new RuntimeException("Stub!");

        }

    }

    public static enum Align {

        CENTER,

        LEFT,

        RIGHT;

        private Align() {

        }

    }

    public static enum Join {

        BEVEL,

        MITER,

        ROUND;

        private Join() {

        }

    }

    public static enum Cap {

        BUTT,

        ROUND,

        SQUARE;

        private Cap() {

        }

    }

    public static enum Style {

        FILL,

        FILL_AND_STROKE,

        STROKE;

        private Style() {

        }

    }

}

简单几何图形绘制

3.drawRect矩形绘制

    /*** 绘制矩形 */

    public void drawRect(RectF rect, Paint paint) ;

    public void drawRect(Rect r, Paint paint);

    public void drawRect(float left, float top, float right, float bottom, Paint paint);

   /*** 绘制圆角矩形，REctF,x轴上的圆角半径，y轴上圆角半径，panint ****/

    public void drawRoundRect(RectF rect, float rx, float ry, Paint paint);

    public void drawRoundRect(float left, float top, float right, float bottom, float rx, float ry, Paint paint);

4.drawLine绘制线段

/*****  绘制线段:pts 的数量需要是4的倍数 ******/

public void drawLine(float startX, float startY, float stopX, float stopY, Paint    paint) ;

public void drawLines(float[] pts, int offset, int count, Paint paint) ;

public void drawLines(float[] pts, Paint paint) ;
      Paint rectPaint = new Paint();

        rectPaint.setAntiAlias(true);

        rectPaint.setColor(Color.GRAY);

        rectPaint.setStyle(Paint.Style.STROKE);

        rectPaint.setStrokeWidth(5);

        rectPaint.setAntiAlias(true);

        rectPaint.setStyle(Paint.Style.FILL);

        rectPaint.setColor(0x88FF0000);

        /***** pos 的数量需要是4个倍数*/

       float []pos=new float[]{10,10,10,100,100,100,100,240};

        /***** pos 每4个一组，4个float代表2个点坐标，然后连接成线*/

       // canvas.drawLines(pos,rectPaint);

        /**** pos，从点pos[2]到pos[5]*/

        canvas.drawLines(pos,rectPaint);

5.绘制圆或椭圆

    /*** 绘制圆形，圆心坐标cx,cy,半径 radius，paint */

    public void drawCircle(float cx, float cy, float radius, Paint paint) ;

    /*** 绘制椭圆 */

    public void drawOval(RectF oval, Paint paint);

    public void drawOval(float left, float top, float right, float bottom, Paint paint);

6.绘制弧形

    /***

    oval :      圆弧的外轮廓矩形区域。

    startAngle: 圆弧起始角度，单位为度。

    sweepAngle: 圆弧扫过的角度，顺时针方向，单位为度

    useCenter:  如果为True时，在绘制圆弧时将圆心包括在内，通常用来绘制扇形。如果为false会绘制切弦 看图吧

    paint:     圆弧的画板属性，如颜色，是否填充等。**/

    public void drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint paint);

    public void drawArc(float left, float top, float right, float bottom, float startAngle, float sweepAngle, boolean useCenter, Paint paint) ;

7.drawPath 绘制图形

 public void drawPath(Path path, Paint paint);

        Paint pathPaint = new Paint();

        pathPaint.setARGB(70, 238, 18, 137);

        pathPaint.setStyle(Paint.Style.FILL);

        pathPaint.setAntiAlias(true);

        pathPaint.setStrokeWidth(5);

        pathPaint.setColor(Color.CYAN);

        pathPaint.setStyle(Paint.Style.FILL);

        Path path = new Path();

        /*** 这个是上图的第三个 */

        path.moveTo(100,100);

        path.lineTo(50,300);

        path.lineTo(300,100);

        path.lineTo(350,300);

        canvas.drawPath(path,pathPaint);

按上图drawpath绘制图形，有moveTo()作为起始点，lineTo连接到各个顶点。第四个图的梯形是moveTo(A)，LineTo(B),LineTo(c) 然后再次moveTo(D),LineTo(B),LineTo(C)的

8.绘制drawText

    /*** 绘制text文字，从text的start到end，绘制起点在(x,y)，*/

    public void drawText(String text, int start, int end, float x, float y, Paint paint) ;

    public void drawText(CharSequence text, int start, int end, float x, float y, Paint paint);
    /*** 绘制text文字，从text的index，绘制count个字数，绘制起点在(x,y)，*/

    public void drawText(char[] text, int index, int count, float x, float y, Paint paint);

    public void drawText(String text, float x, float y, Paint paint);

drawTextOnPath方法：

    /*** 绘制text文字，str ,path,(path是绘制的text的路径，如：path.addArc,文字会随着arc弧形绘制 )**/

    public void drawTextOnPath(String text, Path path, float hOffset, float vOffset, Paint paint) ;

    public void drawTextOnPath(char[] text, int index, int count, Path path, float hOffset, float vOffset, Paint paint) ;
 Path path=new Path();

 path.addRoundRect(100,100,300,300,10,10, Path.Direction.CW);
 /*** path.addRoundRect(100,100,300,300,10,10, Path.Direction.CWW); */

 canvas.drawTextOnPath("这里是drawTextOnPath方法",  path,  20, 20, rectPaint);
       Paint rectPaint = new Paint();

        rectPaint.setAntiAlias(true);

        rectPaint.setColor(Color.RED);

        rectPaint.setStrokeWidth(5);

        rectPaint.setAntiAlias(true);

        rectPaint.setStyle(Paint.Style.STROKE);

        rectPaint.setColor(0x88FF0000);

        rectPaint.setTextSize(40);

CW和CWW的区别：顺时针和逆时针

 

path.addArc()中没有Direction属性，绘制图形大致为下：

drawTextRun方法

 public void drawTextRun(char[] text, int index, int count, int contextIndex, int contextCount, float x, float y, boolean isRtl, Paint paint);

 public void drawTextRun(CharSequence text, int start, int end, int contextStart, int contextEnd, float x, float y, boolean isRtl, Paint paint);

上面的CAN SHU 呢index开始下标，count绘制的数目，contextIndex和index一样（否则就异常退出了） contextCount>=count 。该方法要求api 23呢，isRtl改变了绘制的顺序，

false为正序，true为倒叙了。

   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

            canvas.drawTextRun("眼前风景不足停,不远之处是梦想".toCharArray(), 0, 7, 0, 7, 200, 500, false, rectPaint);

            canvas.drawTextRun("眼前风景不足停,不远之处是梦想".toCharArray(), 0, 7, 0, 9, 200, 600, true, rectPaint);

            canvas.drawTextRun("眼前风景不足停,不远之处是梦想".toCharArray(), 0, 4, 0, 9, 200, 700, false, rectPaint);

            canvas.drawTextRun("眼前风景不足停,不远之处是梦想".toCharArray(), 0, 4, 0, 9, 200, 800, true, rectPaint);

        }

如图：

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