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SmilePainter.dart
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SmilePainter.dart
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import 'dart:ui';
import 'package:flutter/material.dart';
class SmilePainter extends CustomPainter {
//debugging Paint
final debugPaint = new Paint()
..color = Colors.grey //0xFFF9D976
..strokeWidth = 1.0
..style = PaintingStyle.stroke;
final whitePaint = new Paint()
..color = Colors.white //0xFFF9D976
..style = PaintingStyle.fill;
int slideValue = 200;
ReviewState badReview;
ReviewState ughReview;
ReviewState okReview;
ReviewState goodReview;
double centerCenter;
double leftCenter;
double rightCenter;
double smileHeight;
double halfWidth;
double halfHeight;
double radius;
double diameter;
double startingY;
double startingX;
double endingX;
double endingY;
double oneThirdOfDia;
double oneThirdOfDiaByTwo;
double eyeRadius;
double eyeRadiusbythree;
double eyeRadiusbytwo;
SmilePainter(int slideValue) : slideValue = slideValue;
Size lastSize;
ReviewState currentState;
@override
void paint(Canvas canvas, Size size) {
if (size != lastSize) {
lastSize = size;
smileHeight = size.width / 2;
halfWidth = size.width / 2;
halfHeight = smileHeight / 2;
radius = 0.0;
eyeRadius = 10.0;
if (smileHeight < size.width) {
radius = halfHeight - 16.0;
} else {
radius = halfWidth - 16.0;
}
eyeRadius = radius / 6.5;
eyeRadiusbythree = eyeRadius/3;
eyeRadiusbytwo = eyeRadius/2;
diameter = radius * 2;
//left top corner
startingX = halfWidth - radius;
startingY = halfHeight - radius;
oneThirdOfDia = (diameter / 3);
oneThirdOfDiaByTwo = oneThirdOfDia / 2;
//bottom right corner
endingX = halfWidth + radius;
endingY = halfHeight + radius;
final leftSmileX = startingX + (radius / 2);
badReview = ReviewState(
Offset(leftSmileX, endingY - (oneThirdOfDiaByTwo * 1.5)),
Offset(startingX + oneThirdOfDia,
startingY + radius + (oneThirdOfDiaByTwo)),
Offset(endingX - radius, startingY + radius + (oneThirdOfDiaByTwo)),
Offset(endingX - oneThirdOfDia,
startingY + radius + (oneThirdOfDiaByTwo)),
Offset(endingX - (radius / 2), endingY - (oneThirdOfDiaByTwo * 1.5)),
Color(0xFFfe0944),
Color(0xFFfeae96),
Color(0xFFfe5c6e),
'BAD');
ughReview = ReviewState(
Offset(leftSmileX, endingY - (radius / 2)),
Offset(diameter, endingY - oneThirdOfDia),
Offset(endingX - radius, endingY - oneThirdOfDia),
Offset(endingX - (radius / 2), endingY - oneThirdOfDia),
Offset(endingX - (radius / 2), endingY - oneThirdOfDia),
Color(0xFFF9D976),
Color(0xfff39f86),
Color(0xFFf6bc7e),
'UGH');
okReview = ReviewState(
Offset(leftSmileX, endingY - (oneThirdOfDiaByTwo * 1.5)),
Offset(diameter, endingY - (oneThirdOfDiaByTwo * 1.5)),
Offset(endingX - radius, endingY - (oneThirdOfDiaByTwo * 1.5)),
Offset(startingX + radius, endingY - (oneThirdOfDiaByTwo * 1.5)),
Offset(endingX - (radius / 2), endingY - (oneThirdOfDiaByTwo * 1.5)),
Color(0xFF21e1fa),
Color(0xff3bb8fd),
Color(0xFF28cdfc),
'OK');
goodReview = ReviewState(
Offset(startingX + (radius / 2), endingY - (oneThirdOfDiaByTwo * 2)),
Offset(startingX + oneThirdOfDia,
startingY + (diameter - oneThirdOfDiaByTwo)),
Offset(endingX - radius, startingY + (diameter - oneThirdOfDiaByTwo)),
Offset(endingX - oneThirdOfDia,
startingY + (diameter - oneThirdOfDiaByTwo)),
Offset(endingX - (radius / 2), endingY - (oneThirdOfDiaByTwo * 2)),
Color(0xFF3ee98a),
Color(0xFF41f7c7),
Color(0xFF41f7c6),
'GOOD');
//get max width of text, that is width of GOOD text
TextSpan spanGood = new TextSpan(
style: new TextStyle(
fontWeight: FontWeight.bold,
fontSize: 52.0,
color: okReview.titleColor),
text: "GOOD");
TextPainter tpGood =
new TextPainter(text: spanGood, textDirection: TextDirection.ltr);
tpGood.layout();
double goodWidth = tpGood.width;
double halfGoodWidth = goodWidth / 2;
//center points of BIG labels
centerCenter = halfWidth;
leftCenter = centerCenter - goodWidth;
rightCenter = centerCenter + goodWidth;
}
if (slideValue <= 100) {
tweenText(badReview, ughReview, slideValue / 100, canvas);
} else if (slideValue <= 200) {
tweenText(ughReview, okReview, (slideValue - 100) / 100, canvas);
} else if (slideValue <= 300) {
tweenText(okReview, goodReview, (slideValue - 200) / 100, canvas);
} else if (slideValue <= 400) {
tweenText(goodReview, badReview, (slideValue - 300) / 100, canvas);
}
//draw the outer circle------------------------------------------
final centerPoint = Offset(halfWidth, halfHeight);
final circlePaint = genGradientPaint(
new Rect.fromCircle(
center: centerPoint,
radius: radius,
),
currentState.startColor,
currentState.endColor,
PaintingStyle.stroke,
)..strokeCap = StrokeCap.round;
canvas.drawCircle(centerPoint, radius, circlePaint);
//---------------------------------------------------------------
//draw smile curve with path ------------------------------------------
canvas.drawPath(getSmilePath(currentState), circlePaint);
//---------------------------------------------------------------
//draw eyes---------------------------------------------------
//ele calc
final leftEyeX = startingX + oneThirdOfDia;
final eyeY = startingY + (oneThirdOfDia + oneThirdOfDiaByTwo / 4);
final rightEyeX = startingX + (oneThirdOfDia * 2);
final leftEyePoint = Offset(leftEyeX, eyeY);
final rightEyePoint = Offset(rightEyeX, eyeY);
final Paint leftEyePaintFill = genGradientPaint(
new Rect.fromCircle(center: leftEyePoint, radius: eyeRadius),
currentState.startColor,
currentState.endColor,
PaintingStyle.fill,
);
final Paint rightEyePaintFill = genGradientPaint(
new Rect.fromCircle(center: rightEyePoint, radius: eyeRadius),
currentState.startColor,
currentState.endColor,
PaintingStyle.fill,
);
canvas.drawCircle(leftEyePoint, eyeRadius, leftEyePaintFill);
canvas.drawCircle(rightEyePoint, eyeRadius, rightEyePaintFill);
//draw the edges of BAD Review
if (slideValue <= 100 || slideValue > 300) {
double diff = -1.0;
double tween = -1.0;
if (slideValue <= 100) {
diff = slideValue / 100;
tween = lerpDouble(eyeY-(eyeRadiusbythree*0.6), eyeY-eyeRadius, diff);
} else if (slideValue > 300) {
diff = (slideValue - 300) / 100;
tween = lerpDouble(eyeY-eyeRadius, eyeY-(eyeRadiusbythree*0.6), diff);
}
List<Offset> polygonPath = List<Offset>();
polygonPath.add(Offset(leftEyeX-eyeRadiusbytwo, eyeY-eyeRadius));
polygonPath.add(Offset(leftEyeX+eyeRadius, tween));
polygonPath.add(Offset(leftEyeX+eyeRadius, eyeY-eyeRadius));
Path clipPath = new Path();
clipPath.addPolygon(polygonPath, true);
canvas.drawPath(clipPath, whitePaint);
List<Offset> polygonPath2 = List<Offset>();
polygonPath2.add(Offset(rightEyeX+eyeRadiusbytwo, eyeY-eyeRadius));
polygonPath2.add(Offset(rightEyeX-eyeRadius, tween));
polygonPath2.add(Offset(rightEyeX-eyeRadius, eyeY-eyeRadius));
Path clipPath2 = new Path();
clipPath2.addPolygon(polygonPath2, true);
canvas.drawPath(clipPath2, whitePaint);
}
//draw the balls of UGH Review
if (slideValue > 0 && slideValue < 200) {
double diff = -1.0;
double leftTweenX = -1.0;
double leftTweenY = -1.0;
double rightTweenX = -1.0;
double rightTweenY = -1.0;
if (slideValue <= 100) {
// bad to ugh
diff = slideValue / 100;
leftTweenX = lerpDouble(leftEyeX-eyeRadius, leftEyeX, diff);
leftTweenY = lerpDouble(eyeY-eyeRadius, eyeY, diff);
rightTweenX = lerpDouble(rightEyeX+eyeRadius, rightEyeX, diff);
rightTweenY = lerpDouble(eyeY, eyeY-(eyeRadius+eyeRadiusbythree), diff);
} else {
// ugh to ok
diff = (slideValue - 100) / 100;
leftTweenX = lerpDouble(leftEyeX, leftEyeX-eyeRadius, diff);
leftTweenY = lerpDouble(eyeY, eyeY-eyeRadius, diff);
rightTweenX = lerpDouble(rightEyeX, rightEyeX+eyeRadius, diff);
rightTweenY = lerpDouble(eyeY-(eyeRadius+eyeRadiusbythree), eyeY, diff);
}
canvas.drawOval(Rect.fromLTRB(leftEyeX-(eyeRadius+eyeRadiusbythree), eyeY-(eyeRadius+eyeRadiusbythree), leftTweenX, leftTweenY), whitePaint);
canvas.drawOval(Rect.fromLTRB(rightTweenX, eyeY, rightEyeX+(eyeRadius+eyeRadiusbythree), eyeY-(eyeRadius+eyeRadiusbythree)), whitePaint);
}
//---------------------------------------------------------------
//drawing stuff for debugging-----------------------------------
// canvas.drawRect(
// Rect.fromLTRB(0.0, 0.0, size.width, smileHeight), debugPaint);
// canvas.drawRect(
// Rect.fromLTRB(startingX, startingY, endingX, endingY), debugPaint);
//
// canvas.drawLine(
// Offset(startingX, startingY), Offset(endingX, endingY), debugPaint);
// canvas.drawLine(
// Offset(endingX, startingY), Offset(startingX, endingY), debugPaint);
// canvas.drawLine(Offset(startingX + radius, startingY),
// Offset(startingX + radius, endingY), debugPaint);
// canvas.drawLine(Offset(startingX, startingY + radius),
// Offset(endingX, startingY + radius), debugPaint);
//
// //horizontal lines
// canvas.drawLine(Offset(startingX, startingY + oneThirdOfDia),
// Offset(endingX, startingY + oneThirdOfDia), debugPaint);
// canvas.drawLine(Offset(startingX, endingY - oneThirdOfDia),
// Offset(endingX, endingY - oneThirdOfDia), debugPaint);
// canvas.drawLine(Offset(startingX, endingY - oneThirdOfDiaByTwo),
// Offset(endingX, endingY - oneThirdOfDiaByTwo), debugPaint);
//
// //vertical lines
// canvas.drawLine(Offset(startingX + oneThirdOfDiaByTwo, startingY),
// Offset(startingX + oneThirdOfDiaByTwo, endingY), debugPaint);
// canvas.drawLine(Offset(startingX + oneThirdOfDia, startingY),
// Offset(startingX + oneThirdOfDia, endingY), debugPaint);
// canvas.drawLine(Offset(endingX - oneThirdOfDia, startingY),
// Offset(endingX - oneThirdOfDia, endingY), debugPaint);
// canvas.drawLine(Offset(endingX - oneThirdOfDiaByTwo, startingY),
// Offset(endingX - oneThirdOfDiaByTwo, endingY), debugPaint);
//--------------------------------------------------------------
}
tweenText(ReviewState centerReview, ReviewState rightReview, double diff,
Canvas canvas) {
currentState = ReviewState.lerp(centerReview, rightReview, diff);
TextSpan spanCenter = new TextSpan(
style: new TextStyle(
fontWeight: FontWeight.bold,
fontSize: 52.0,
color:
centerReview.titleColor.withAlpha(255 - (255 * diff).round())),
text: centerReview.title);
TextPainter tpCenter =
new TextPainter(text: spanCenter, textDirection: TextDirection.ltr);
TextSpan spanRight = new TextSpan(
style: new TextStyle(
fontWeight: FontWeight.bold,
fontSize: 52.0,
color: rightReview.titleColor.withAlpha((255 * diff).round())),
text: rightReview.title);
TextPainter tpRight =
new TextPainter(text: spanRight, textDirection: TextDirection.ltr);
tpCenter.layout();
tpRight.layout();
Offset centerOffset =
new Offset(centerCenter - (tpCenter.width / 2), smileHeight);
Offset centerToLeftOffset =
new Offset(leftCenter - (tpCenter.width / 2), smileHeight);
Offset rightOffset =
new Offset(rightCenter - (tpRight.width / 2), smileHeight);
Offset rightToCenterOffset =
new Offset(centerCenter - (tpRight.width / 2), smileHeight);
tpCenter.paint(canvas, Offset.lerp(centerOffset, centerToLeftOffset, diff));
tpRight.paint(canvas, Offset.lerp(rightOffset, rightToCenterOffset, diff));
}
Path getSmilePath(ReviewState state) {
var smilePath = Path();
smilePath.moveTo(state.leftOffset.dx, state.leftOffset.dy);
smilePath.quadraticBezierTo(state.leftHandle.dx, state.leftHandle.dy,
state.centerOffset.dx, state.centerOffset.dy);
smilePath.quadraticBezierTo(state.rightHandle.dx, state.rightHandle.dy,
state.rightOffset.dx, state.rightOffset.dy);
return smilePath;
}
Paint genGradientPaint(
Rect rect, Color startColor, Color endColor, PaintingStyle style) {
final Gradient gradient = new LinearGradient(
colors: <Color>[
startColor,
endColor,
],
);
return new Paint()
..strokeWidth = 10.0
..style = style
..shader = gradient.createShader(rect);
}
@override
bool shouldRepaint(CustomPainter oldDelegate) {
return true;
}
}
class ReviewState {
//smile points
Offset leftOffset;
Offset centerOffset;
Offset rightOffset;
Offset leftHandle;
Offset rightHandle;
String title;
Color titleColor;
Color startColor;
Color endColor;
ReviewState(
this.leftOffset,
this.leftHandle,
this.centerOffset,
this.rightHandle,
this.rightOffset,
this.startColor,
this.endColor,
this.titleColor,
this.title);
//create new state between given two states.
static ReviewState lerp(ReviewState start, ReviewState end, double ratio) {
var startColor = Color.lerp(start.startColor, end.startColor, ratio);
var endColor = Color.lerp(start.endColor, end.endColor, ratio);
return ReviewState(
Offset.lerp(start.leftOffset,end.leftOffset, ratio),
Offset.lerp(start.leftHandle, end.leftHandle, ratio),
Offset.lerp(start.centerOffset, end.centerOffset, ratio),
Offset.lerp(start.rightHandle, end.rightHandle, ratio),
Offset.lerp(start.rightOffset, end.rightOffset, ratio),
startColor,
endColor,
start.titleColor,
start.title);
}
}