public void onDraw(Canvas canvas) {
// 검정색 배경으로 지운다. 빈 화면이면 지우기만 하고 리턴
canvas.drawColor(Color.BLACK);
if (status == BLANK) {
return;
}
// 도형 목록을 순회하면서 도형 정보대로 출력한다.
int idx;
for (idx = 0; idx < arShape.size(); idx++) {
Paint Pnt = new Paint();
Pnt.setAntiAlias(true);
Pnt.setColor(arShape.get(idx).color);
Rect rt = arShape.get(idx).rt;
switch (arShape.get(idx).what) {
case Shape.RECT:
canvas.drawRect(rt, Pnt);
break;
case Shape.CIRCLE:
canvas.drawCircle(
rt.left + rt.width() / 2, rt.top + rt.height() / 2, rt.width() / 2, Pnt);
break;
case Shape.TRIANGLE:
Path path = new Path();
path.moveTo(rt.left + rt.width() / 2, rt.top);
path.lineTo(rt.left, rt.bottom);
path.lineTo(rt.right, rt.bottom);
canvas.drawPath(path, Pnt);
break;
}
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (paint == null) {
paint = new Paint();
luar =
new LinearGradient(
0.f, 0.f, 0.f, this.getMeasuredHeight(), 0xffffffff, 0xff000000, TileMode.CLAMP);
}
int rgb = Color.HSVToColor(color);
Shader dalam =
new LinearGradient(0.f, 0.f, this.getMeasuredWidth(), 0.f, 0xffffffff, rgb, TileMode.CLAMP);
ComposeShader shader = new ComposeShader(luar, dalam, PorterDuff.Mode.MULTIPLY);
paint.setShader(shader);
canvas.drawRect(0.f, 0.f, this.getMeasuredWidth(), this.getMeasuredHeight(), paint);
}
public void draw() {
Bitmap bitmap = Bitmap.createBitmap(200, 200, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
RectF rect = new RectF(8, 8, 192, 192);
Paint p = new Paint();
p.setAntiAlias(true);
p.setStyle(Paint.Style.STROKE);
p.setColor(ColS);
p.setStrokeWidth(16);
int S = 162;
int H = 300;
// S
canvas.drawArc(rect, -90, S, false, p);
p.setStyle(Paint.Style.FILL);
p.setColor(ColM);
H -= 90;
canvas.drawCircle(100, 100, 72, p);
p.setColor(ColH);
p.setStrokeWidth(2);
float sx, sy;
sx = (float) (72 * Math.cos(Math.PI * H / 180));
sy = (float) (72 * Math.sin(Math.PI * H / 180));
canvas.drawLine(100, 100, sx + 100, sy + 100, p);
ImageView clokImg;
clokImg = (ImageView) findViewById(R.id.clokImage);
clokImg.setImageBitmap(bitmap);
// Hour picker
Bitmap ColPickBmp = Bitmap.createBitmap(80, 50, Bitmap.Config.ARGB_8888);
Canvas ColPickCanvas = new Canvas(ColPickBmp);
ImageView colPickImg = (ImageView) findViewById(R.id.colorHou);
rect = new RectF(0, 0, 80, 50);
p = new Paint();
p.setAntiAlias(true);
p.setStyle(Paint.Style.FILL);
p.setColor(ColH);
ColPickCanvas.drawRect(rect, p);
colPickImg.setImageBitmap(ColPickBmp);
// Minute picker
ColPickBmp = Bitmap.createBitmap(80, 50, Bitmap.Config.ARGB_8888);
ColPickCanvas = new Canvas(ColPickBmp);
colPickImg = (ImageView) findViewById(R.id.colorMin);
rect = new RectF(0, 0, 80, 50);
p = new Paint();
p.setAntiAlias(true);
p.setStyle(Paint.Style.FILL);
p.setColor(ColM);
ColPickCanvas.drawRect(rect, p);
colPickImg.setImageBitmap(ColPickBmp);
// Second picker
ColPickBmp = Bitmap.createBitmap(80, 50, Bitmap.Config.ARGB_8888);
ColPickCanvas = new Canvas(ColPickBmp);
colPickImg = (ImageView) findViewById(R.id.colorSec);
rect = new RectF(0, 0, 80, 50);
p = new Paint();
p.setAntiAlias(true);
p.setStyle(Paint.Style.FILL);
p.setColor(ColS);
ColPickCanvas.drawRect(rect, p);
colPickImg.setImageBitmap(ColPickBmp);
}
/**
* 自定义的方法,简单绘制一些基本图形
*
* @param mCanvas 把图形画在mCanvas上
*/
public void canvasMethod(Canvas mCanvas) {
// 创建对应坐标的矩形区域
RectF mArc = new RectF(mX, mY - 70, mX + 50, mY - 20);
// 画填充弧,在矩形区域内,从弧的最右边开始,画270度,然后再通过连接圆心来填充
mCanvas.drawArc(mArc, 0, 270, true, mPaint);
// 获得icon的Bitmap对象
Bitmap mBitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);
// 画图片
mCanvas.drawBitmap(mBitmap, mX, mY, mPaint);
// 画圆,(x轴,y轴,半径,画笔)
mCanvas.drawCircle(mX + 10, mY + 60, 10, mPaint);
// 画一条线,(起点横坐标,起点纵坐标,终点横坐标,终点纵坐标,画笔)
mCanvas.drawLine(mX, mY + 75, mX + 20, mY + 75, mPaint);
// 画多条线,(坐标数组,画笔)坐标数组里每四个值构成一条线
mCanvas.drawLines(
new float[] {mX + 50, mY + 45, mX + 50, mY + 75, mX + 60, mY + 45, mX + 60, mY + 75},
mPaint);
// 创建对应矩形区域
RectF mOval = new RectF(mX, mY + 80, mX + 60, mY + 110);
// 画椭圆
mCanvas.drawOval(mOval, mPaint);
/*
* Paint qPaint = new Paint(); qPaint.setColor(Color.RED);
* mCanvas.drawPaint(qPaint);
*/
// 重置Path里的所有路径
mPath.reset();
// 设置Path的起点
mPath.moveTo(mX, mY + 120);
// 第二个点
mPath.lineTo(screenW - 10, mY + 120);
// 第三个点
mPath.lineTo(screenW - 10, mY + 150);
// 画出路径,这里画的是三角形
mCanvas.drawPath(mPath, mPaint);
// 重置Path里的所有路径
qPath.reset();
// 设置Path的起点
qPath.moveTo(qStartX, qStartY);
// 设置贝塞尔曲线的控制点坐标和终点坐标
qPath.quadTo(qControlX, qCOntrolY, qEndX, qEndY);
// 画出贝塞尔曲线
mCanvas.drawPath(qPath, qPaint);
// 画点
mCanvas.drawPoint(mX, mY + 155, qPaint);
// 画多个点,坐标数组每两个值代表一个点的坐标
mCanvas.drawPoints(new float[] {mX, mY + 160, mX + 5, mY + 160, mX + 5, mY + 160}, qPaint);
// 画矩形
mCanvas.drawRect(mX, mY + 170, mX + 100, mY + 220, mPaint);
// 设置矩形区域
RectF mRect = new RectF(mX, mY + 230, mX + 100, mY + 260);
// 画圆角矩形,这个方法的第二第三个参数在后面有图讲解
mCanvas.drawRoundRect(mRect, 10, 10, mPaint);
// 画文本
mCanvas.drawText("drawText", mX, mY + 290, mPaint);
// 画文本,数组里每两个值代表文本的一个字符的坐标，数组的坐标可以比字符串里的字符多，但不可以少
mCanvas.drawPosText(
"哈哈你好",
new float[] {mX, mY + 310, mX + 20, mY + 310, mX + 40, mY + 310, mX + 60, mY + 310},
mPaint);
// 重置Path
tPath.reset();
// 添加一个圆形路径,坐标,半径,方向(顺时针还是逆时针)
tPath.addCircle(mX + 10, mY + 340, 10, Path.Direction.CW);
// 画出路径
mCanvas.drawPath(tPath, qPaint);
// 把文本画在路径上,但不会画出路径
mCanvas.drawTextOnPath("draw", tPath, 30, 0, mPaint);
}