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I want to draw circle with scale lines on canvas.
the circle contain 100 ticks.But between 1 to 2 there is a more number of sub ticks compare to other, also I want to calculate the scale depending upon the user input(circle rotation).
please help me..
i tried this http://mindtherobot.com/blog/272/android-custom-ui-making-a-vintage-thermometer/
private void drawScale(Canvas canvas) {
//canvas.drawOval(scaleRect, scalePaint);
canvas.drawCircle(0.5f,0.5f, 0.49f,scalePaint);
canvas.save(Canvas.MATRIX_SAVE_FLAG);
for (i = 0; i < totalNicks; ++i) {
float y1 = scaleRect.top;
float y2 = y1 - 0.020f;
//canvas.drawLine(0.5f, y1, 0.5f, y2, scalePaint);
if (i % 1 == 0) {
int value = nickToDegree(i);
if(value<=360)
{
float y3 = 0;
scaleText =new Paint();
scaleText.setTextSize(0.035f);
scaleText.setColor(Color.BLACK);
scaleText.setTypeface(Typeface.DEFAULT_BOLD);
scaleText.setTextScaleX(0.8f);
scaleText.setTextAlign(Paint.Align.CENTER);
scaleText.setStrokeWidth(0.015f);
scaleText.setAntiAlias(true);
scaleline =new Paint();
scaleline.setStyle(Paint.Style.FILL);
scaleline.setColor(Color.BLACK);
scaleline.setStrokeWidth(0.005f);
scaleline.setAntiAlias(true);
switch (value) {
case 0:y3 = y1 - 0.120f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1", 0.5f, y3 - 0.05f, scaleText);
break;
case 2:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 1/16", 0.5f, y3 - 0.015f, scaleText);
break;
case 4:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 1/8", 0.5f, y3 - 0.015f, scaleText);
break;
case 6:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 3/16", 0.5f, y3 - 0.015f, scaleText);
break;
case 8:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 1/4", 0.5f, y3 - 0.015f, scaleText);
break;
case 10:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 5/16", 0.5f, y3 - 0.015f, scaleText);
break;
case 12:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 3/8", 0.5f, y3 - 0.015f, scaleText);
break;
case 14:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 7/16", 0.5f, y3 - 0.015f, scaleText);
break;
case 16:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 1/12", 0.5f, y3 - 0.015f, scaleText);
break;
case 18:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 9/16", 0.5f, y3 - 0.015f, scaleText);
break;
case 20:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 5/8", 0.5f, y3 - 0.015f, scaleText);
break;
case 22:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 11/16", 0.5f, y3 - 0.015f, scaleText);
break;
case 24:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 3/4", 0.5f, y3 - 0.015f, scaleText);
break;
case 26:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 13/16", 0.5f, y3 - 0.015f, scaleText);
break;
case 28:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 7/8", 0.5f, y3 - 0.015f, scaleText);
break;
case 30:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("1 15/16", 0.5f, y3 - 0.015f, scaleText);
break;
case 32:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("2", 0.5f, y3 - 0.015f, scaleText);
break;
case 34:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("2 1/4", 0.5f, y3 - 0.015f, scaleText);
break;
case 36:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("2 1/2", 0.5f, y3 - 0.015f, scaleText);
break;
case 38:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("2 3/4", 0.5f, y3 - 0.015f, scaleText);
break;
case 40:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("3", 0.5f, y3 - 0.015f, scaleText);
break;
case 42:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("3 1/4", 0.5f, y3 - 0.015f, scaleText);
break;
case 44:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("3 1/2", 0.5f, y3 - 0.015f, scaleText);
break;
case 46:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("3 3/4", 0.5f, y3 - 0.015f, scaleText);
break;
case 48:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("4", 0.5f, y3 - 0.015f, scaleText);
break;
case 50:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("4 1/4", 0.5f, y3 - 0.015f, scaleText);
break;
case 52:y3 = y1 - 0.070f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("4 1/2", 0.5f, y3 - 0.015f, scaleText);
break;
case 54:y3 = y1 - 0.030f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("4 3/4", 0.5f, y3 - 0.015f, scaleText);
break;
case 56:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("5", 0.5f, y3 - 0.015f, scaleText);
break;
case 60:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("6", 0.5f, y3 - 0.015f, scaleText);
break;
case 64:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("7", 0.5f, y3 - 0.015f, scaleText);
break;
case 68:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("8", 0.5f, y3 - 0.015f, scaleText);
break;
case 71:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("9", 0.5f, y3 - 0.015f, scaleText);
break;
case 74:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("10", 0.5f, y3 - 0.015f, scaleText);
break;
case 77:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("11", 0.5f, y3 - 0.015f, scaleText);
break;
case 80:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("12", 0.5f, y3 - 0.015f, scaleText);
break;
case 82:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("13", 0.5f, y3 - 0.015f, scaleText);
break;
case 84:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("14", 0.5f, y3 - 0.015f, scaleText);
break;
case 86:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("15", 0.5f, y3 - 0.015f, scaleText);
break;
case 89:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("20", 0.5f, y3 - 0.015f, scaleText);
break;
case 92:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("25", 0.5f, y3 - 0.015f, scaleText);
break;
case 94:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("30", 0.5f, y3 - 0.015f, scaleText);
break;
case 96:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("35", 0.5f, y3 - 0.015f, scaleText);
break;
case 98:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("40", 0.5f, y3 - 0.015f, scaleText);
break;
case 101:y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("45", 0.5f, y3 - 0.015f, scaleText);
break;
case 103:
y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("50", 0.5f, y3 - 0.015f, scaleText);
break;
case 105: y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("55", 0.5f, y3 - 0.015f, scaleText);
break;
case 107: y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("60", 0.5f, y3 - 0.015f, scaleText);
case 109:
y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("65", 0.5f, y3 - 0.015f, scaleText);
break;
case 111:
y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("70", 0.5f, y3 - 0.015f, scaleText);
break;
case 113:
y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("75", 0.5f, y3 - 0.015f, scaleText);
break;
case 115:
y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("80", 0.5f, y3 - 0.015f, scaleText);
break;
case 117:
y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("85", 0.5f, y3 - 0.015f, scaleText);
break;
case 119:
y3 = y1 - 0.090f;
canvas.drawLine(0.5f, y1, 0.5f, y3, scaleline);
canvas.drawText("90", 0.5f, y3 - 0.015f, scaleText);
break;
}
}
}
canvas.rotate(degreesPerNick, 0.5f, 0.5f);
}
canvas.restore();
}
guys I have one more problem.
When i rotate a wheel. textview should show the fraction displayed on the tick pointed by the pointer
285
Try to use gesture on the canvas (or on canvas imageview) use Gesture listeners, ScaleListener for calculating the scale.
Link: Image in Canvas with touch events
Other than that use prerecorded gestures or implement GestureOverlayView to detect gestures inputs for calculating the scale (little more complex)
For more Info: Gestures detection and canvas scale, translate and rotate
Also More info on implementing Gestures : Link1 , Link2
155
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